Document:

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                                                                    Exhibit 10.6

                             PREMISES LEASE CONTRACT

Lessor (Party A): Shenzhen New and High-tech Village

                  Development Company

Address: Shenzhen New and High-tech Village, Shennan

Dadao, Nanshan District, Shenzhen, PRC

"Premise Lease Permit" No: (Shennan) Premises Lease Certificate No.

Authorized Agent: Wu Xianghan (Director Operation Department

Shenzhen New and High-tech Village

Development Company

Address: Shenzhen New and High-tech Village, Nanshan

District, Shenzhen, PRC

Lessee (Party B): New Focus, inc.

                  2630 Walsh Avenue

                  Santa Clara, CA 95051

                  USA

Business License No: Oi Du Yue Shen Zong Fu Zi No. 306193

Pursuant to the provisions of "Regulation of Shenzhen Special Economic Zone on
the Administration of "Premises Lease" and its detailed implementing rules,
Party A and Party B have reached an agreement after consultations and hereby
conclude this Contract.

The content of this Contract is as follows:

Clause 1.         Party A shall lease to Party B the leased premises located
                  in R3B1A, Shenzhen New and High-tech Village, Shenana Dadao,
                  Nanshan District, Shenzhen Special Economic Zone, with a total
                  built up area of 1382.31(m2).

Clause 2.         Party B shall lease the leased premises for its own use for
                  a period 6 years, commencing on and from October 1, 1999 to
                  September 30, 2002.

Clause 3.         Party B shall use the leased premises for the purpose of
                  production and office.
<PAGE>   2
                  Party A warrant that the leased premises can be used for the
                  above-mentioned purpose and is in compliance with the
                  regulations of the State with respect to fire safety.

                  In the event that Party B needs to use the leased premises for
                  purposes other than what are specified above, it shall have
                  the written consent of Party A and shall apply for the
                  approval of the proposed change of use of the leased premises
                  in accordance with the relevant laws, regulations.

Clause 4.         Party A warrants that the proposed use of the leased premises
                  set out in Clause 3 are in compliance with the relevant laws,
                  regulations and rules.

                  Party B warrants that, in the course of using the leased
                  premises, its acts and conduct are in compliance with the
                  relevant laws, regulations and rules.

Clause 5.         The unit rent for the leased premises shall be RMB 30.00
                  per square meter of the built-up area per month, and total
                  monthly rental payable shall be RMB 41,460.00.

                  Party A shall deliver the leased premises Party A the rent
                  before 5th day of each month.

Clause 6.         Party A shall deliver the leased premises to Party B on or
                  before October 1, 1999.

                  In the event that Party A's delivery of the leased premises
                  being later than the date set out above. Party B may request
                  extension of this Contract accordingly, and it shall be
                  confirmed by both Parties in writing.

Clause 7.         During the lease term, Party A shall be responsible for the
                  payment of Property Tax, Land Use Fee and Lease Administration
                  Fee. While Party B shall be responsible for the payment of
                  water and electricity charges, sanitation fee, the property
                  (building) management fee, and telephone bills.

Clause 8.         The various fees payable by Party B shall be paid on its
                  behalf by Party A for the month of the lease and they shall be
                  refunded by Party B to Party A with 10 days of Party B having
                  used the leased premises for a month. Subsequent payments
                  shall be made in advance at the amounts equivalent to those
                  paid for the preceding month. Each advance payment made shall
                  be settled at the next advance payment to be made.

                  When setting the fees paid by Party B, Party A shall provide
                  Party B with relevant evidence of payment.
<PAGE>   3
                  In the event that Party B fails to make any advance payment
                  for 1 month, Party A shall have the right to demand for such
                  payment. In the event that an amount payable by Party B
                  remains owing for 1 month, Party A shall have the right to
                  suspend Party B's use of the relevant facilities. Where
                  otherwise agreed by the Parties, such agreements shall be
                  followed instead.

Clause 9.         This Contract is secured by way of deposit. Party A, upon
                  delivery of the leased premises, may receive from Party B a
                  rent deposit equivalent to one month's rent, i.e. an amount of
                  RMB 42,460.00.

                  Party A shall issue a receipt to Party B for its receipt of
                  the rent deposit from Party B.

                  Both parties shall fulfil all the terms and conditions of this
                  Contract on their own initiative. Either Party shall be liable
                  for its breach of this Contract in accordance with law.

Clause 10.        Party A shall ensure that the safety conditions of the
                  leased premises and its interior facilities is in compliance
                  with relevant laws, regulations and rules. Party B shall use
                  such facilities in the leased premises in a normal manner and
                  shall take good care of them and prevent them from any damage.
                  Upon termination of this Contract, Party B shall return the
                  leased premises as schedule and ensure that the leased
                  premises and its internal facilities are in good condition
                  (except for normal wear and tear). And shall settle all fees
                  payable by Party B.

Clause 11.        If, during Party B's normal use of the leased premises,
                  there is any damage or breakdown in relation to the leased
                  premises or any of it's internal facilities that effects its
                  safety and normal use, Party B shall inform Party A in a
                  timely manner and shall take effective measures. Party A shall
                  carry out the repair of the same within 7 days of its receipt
                  of the notice from Party B for this purpose, or that Party A
                  refuses to carry out the repair works, Party B may carry out
                  the repair works on the behalf of Party A following a
                  verification of the same by the government authority with
                  which this Contract is registered.

                  The costs of repairing referred to in this clause (including
                  the repair works to be carried out by Party B on behalf of
                  Party A) shall be borne by Party A.

Clause 12.        Regarding any damage to or breakdown of the leased
                  premises or any of its internal facilities resulting from
                  Party B's inappropriate or unreasonable use of the same. Party
                  B shall be responsible for the repair of the same in a timely
                  manner. In the event that Party B refuses to carry out the
                  repair works, Party A may carry out the repair works on behalf
                  of
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                  Party B following a verification of the same by the government
                  authority with which this Contract is registered. The cost for
                  such repair shall be borne by Party B.

Clause 13         During the term of this Contract, if Party A has a genuine
                  need to rebuild, expand or renovate the leased premises, it
                  may do so provided that Party B's consent and the relevant
                  authorities approval for the same have been obtained. Party A
                  and Party B shall enter into a separate agreement in writing
                  in relation thereto.

                  During the term of this contract, Party B may renovate the
                  leased premises After Party A's consent and the relevant
                  authorities approval for the same have been obtained. Party A
                  and Party B shall enter into a separate agreement in writing
                  in relation thereto.

Clause 14.        Party B shall not sub-lease the leased premises to others,
                  whether in whole or in part, without Party A's written
                  consent. For sublease consent by Party A, related registration
                  formalities shall be completed by Party B with the
                  administrative authority of premise leasing. The expiration
                  date of such sublease shall in no circumstances be late than
                  that of Party B's original lease of the leased premises.
                  Besides, Party B shall ensure that the subleased leased
                  premises shall not be future subleases by its sub-lessee.

Clause 15.        During the term of this Contract, if Party A wants to
                  transfer all or part of the leased premise, a one month
                  advance notice shall be served on Party B, Who shall have a
                  preemptive right where the condition offered for such transfer
                  are the same.

                  In the event of the transfer of the leased premises, Party A
                  shall ensure that the transfer will continue with the
                  performance of this Contract.

Clause 16.        During the term of this Contract, This Contract shall be
                  terminated automatically in the event of any of the following:

                  (1)      The occurrence of any force majeure or other
                           contingency which render the performance of this
                           Contract impossible;

                  (2)      The leased premises is to be removed from the land on
                           which it stands as a result of the government's
                           acquisition of the land;

                  (3)      Party A's "Premises Lease Permit" has become invalid.

Clause 17.        In the event of any of the following, Party A shall have
                  the right to terminate this Contract and Party A's losses
                  sustained as a result of such termination shall be compensated
                  by Party B:
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                  (1)      Party B's failure to pay rental due for over 2 month;

                  (2)      Party B delays to pay various fees over N/A;
                                                                   ---

                  (3)      Party B's change of the use the leased premises
                           without Party A's consent and the relevant
                           authorities' approval for the same;

                  (4)      Party B's breach of Clause 12 herein by refusing to
                           bear the obligation of maintenance or the costs
                           related thereto which results, in serious damage to
                           the leased premises and the facilities;

                  (5)      Party B's renovation of leased remises without Party
                           A's written consent and approval of relevant
                           authorities for the same;

                  (6)      Party B's sub-lease of the leased premises to other
                           parties without Party A's written consent.

Clause 18.        In the event of any of the following, Party B shall have
                  the Right to terminate this Contract and its losses, if any,
                  so sub-stained shall be compensated by Party A:

                  (1)      Party A delays the delivery of the leased premises
                           for over N/A month;
                                    ---

                  (2)      Party A breaches Clause 4 herein which renders Party
                           B's continued use of the leased premises in
                           accordance with its planned use impossible;

                  (3)      Party A breaches Clause 11 herein by refusing to
                           fulfill its obligations of maintenance and repairs
                           nor to bears the costs for same, as a result of which
                           Party B can not continue with the lease of the leased
                           premise;

                  (4)      Party carries out rebuilding, extension or renovation
                           of the leased premises without Party B's consent or
                           the approval of the relevant authorities for the
                           same.

                  In the event that Party B, relying on any of the above
                  situation, terminates this Contract unilaterally; it shall
                  notify Party A in a timely Manner and shall withdraw from the
                  leased premises. It shall have the right to request a refund
                  of double deposit it has paid to Party A and payment of
                  liquidated damages. The balance, if any of the money pre-paid
                  by Party B shall also be refund to Party B.
<PAGE>   6
Clause 19.        In the event that Party B wishes to extend the lease of
                  the leased premises after the expiration of the lease term, it
                  shall put forward its request of extension to Party A six
                  month in advance of the expiration of the lease term. If party
                  A still wishes to lease out the leased premises after
                  expiration of the lease term, Party B shall have the
                  pre-emptive right to lease the leased premises on the same
                  terms offered by third parties.

                  If a consensus is established between the two Parties with
                  regard to the Extension of the lease, the two Parties shall
                  enter into a separate contract for this purpose and such a
                  contract shall be registered with the registration authority.

Clause 20.        After the termination of this contract, Party B shall
                  withdraw from the leased premises and return the same to Party
                  A within 15 days of the termination date. If Party B fails to
                  withdraw from the leased premises or Return the same to Party
                  A when due, Party A shall have the right to commence
                  proceedings at the People's court.

Clause 21.        In the event that Party B delays in paying rental to Party
                  A, Party B shall pay Party A an overdue fine, which calculated
                  at the number of days overdue multiplied by 5%o of the monthly
                  rental payable.

Clause 22.        Party B shall pay liquidated damage to Party A if it
                  subleases the leased premises in whole or in part
                  unilaterally. The amount of the liquidated damages payable
                  shall bee RMB 50.00 per square meter of the leased premises
                  subleased each month.

Clause 23.        In the event of either Party failing to fulfill its
                  obligations hereunder, the Party in fault shall compensate the
                  other Party for any losses actually incurred and any losses of
                  expected revenue.

Clause 24.        Any supplements to, or removals from the existing clauses
                  of the Contract may be set out by Party A and Party B in
                  attachment to this Contract. Such attachments, if any, shall
                  be of equal legal effect as this Contract.

                  Party A and Party B may enter into a supplementary agreement,
                  once registered with the registration authority, shall be of
                  equal legal effect as this Contract.

Clause 25.        Any dispute arising out of the performance of this
                  Contract shall be settled amicably through consultation. If
                  such dispute cannot be settled amicably, it may be referred to
                  the registration authority with which this Contract was
                  originally registered for mediation or, _____ to Shenzhen
                  Arbitration Committee for arbitration, ________Check
                  Mark___________ to the People's Court for court judgement (The
                  two parties shall jointly choose either of the above two
                  options and put a check mark in the relevant box).
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Clause 26.        This Contract is written in the Chinese Language with
                  English Language version being the duplicate copy of this
                  Contract.

Clause 27.        There shall be 3 copies if this Contract, 1 copy for each of
                  Party and Party B to keep, and 1 copy for the registration
                  authority.

Clause 28.        This contract shall come into force upon execution of the
                  same.
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Party A (Signature and Seal)

Legal Representative: /s/ Signature Illegible

Contact Telephone No:

Bank Account No:

Authorized Representative (Signature and Seal):

Party B (Signature and Seal)

Legal Representative: /s/ Signature Illegible

Contact Telephone No:

Bank Account No:

Authorized Representative (Signature and Seal):

                                      Date:

Witness: (Signature and Seal)

                                      Date:

Registration Authority (Signature and Seal)

                                      Date:
<PAGE>   9
               SUPPLEMENTAL PROVISIONS TO PREMISES LEASE CONTRACT

These Supplemental Provisions are attached to and constitute an integral part of
the Premises Lease Contract between Shenzhen New and High-tech Village
Development Company (Party A) and New Focus, Inc., (Party B) 2630 Walsh Ave.,
Santa Clara, CA 95051, U.S.A. As set out in Clause 24 of the Premises Lease
Contract, this attachment shall have equal legal effect as the lease Contract.
The following provisions are agreed to between Party A and Party B concerning
the leased facility at Building Section R3B1a, Shenzhen New and High-Tech
Village, Shennan Dadao, Nanshan District, Shenzhen, PRC, hereinafter referred to
as "Premises". The Premises Lease Contract and these Supplemental Provisions
hereinafter shall be collectively referred to as the "Lease Contract".

1.       The lease term shall be for 3 years period starting Oct 1, 1999 and
         ending September 30, 2002. The rental shall be 30 RMB/m.2/mo for the
         1,382m2 facility or 41,460 RMB/mo.

2.       The management fee shall be 2.1 RMB/m.2/mo. The management fee includes
         security, janitorial services, standard equipment maintenance provided
         with the building and outside ground maintenance. Party B will sign
         contract with Property Management Company of Shenzhen New and High-Tech
         Property Park District on the premises management and the payment of
         management fee, water fee and electricity fee.

         Upon expiration of the 3 year lease term, this lease can be renewed for
         additional 3 year periods at Party B's option, provided that Party B
         provides a notice in writing to Party A in accordance with Clause 19 of
         the Premises Lease Contract. When the time comes, both Parties will
         sign new contract.

         Both Parties agree that the rental in respect of the additional 3 years
         lease term may be adjusted upwards. The percentage of the rental
         increase will base on the direct rental issued by the Shenzhen City
         government on that time.

3.       Party B shall have a right of first refusal in leasing the adjacent
         546m.2 facility upon availability based on expiration of any existing
         lease obligations to another party. The rental rate will be the same as
         the rental Party B then pays for the 1,382m.2 facility.

4.       Party B shall provide an advance payment of 200,000 yuan as an
         improvement fee to the Shenzhen Power Supply Bureau upon [execution of
         the Lease Contract] to increase power capacity to meet the attached
         specifications proposal 1. Party A will be in charge of the improvement
         project of power capacity. If the improvement project cannot be
         completed on time, it can be postpone. The delivery day of the Premises
         is the complete day of the improvement project of power capacity. The
         improvement fee will not be refund by the Lease Contract expiration.

5.       When the Lease Contract and Supplemental provision are established,
         Party B agrees to pay a rental deposit equivalent to the first month's
         rent of 41,460 RMB. When the Lease Contract and Supplemental Provision
         are effective, The rental deposit will be as the rental of the first
         month.
<PAGE>   10
6.       Party A shall be responsible for handling the registration of the Lease
         Contract in accordance with the laws and regulations of the PRC and the
         payment of any stamp duty, notary fees (if required) and registration
         fees.

7.       Party A. represents and warrants to Party B that as of the date hereof
         and during the lease term:

         (a)      It is the sole owner of the Premises and has not granted the
                  right to use the Premises to any other third party;

         (b)      It is entitled to lease the Premises to Party B in compliance
                  with the relevant PRC laws and it has obtained all necessary
                  approvals and registration required under PRC laws to make the
                  lease legally effective on the date hereof;

         (c)      The Premises shall be free and clear of mortgages, liens or
                  other encumbrances or security interests that would affect
                  Party B's occupancy under the Lease Contract.

         (d)      Party B shall be able to use the Premises within interruption
                  by Party A or any one claiming on behalf of, through or
                  entrust for Party A;

         (e)      The Premises shall be free of defects that would affect Party
                  B's occupancy under the Lease Contract; and

         (f)      Party B is responsible for the payment of water fee,
                  electricity fee and property management fee of the Lease
                  Premises. Party A shall be responsible for the payment of all
                  taxes and fee for which it is liable under applicable PRC laws
                  in connection with the Lease Contract.

                  If any of the representations and warranties of Party A made
         above is, at any time, found to be untrue, misleading or incorrect;
         Party B shall have the right to rescind the Lease Contract by providing
         written notice to Party A, without liability on the part of Party B.
         Party A shall indemnify actual loss of Party B, if any, those damages
         of Party B are raised from such breach.

8.       In the event of any discrepancies or inconsistencies between these
         Supplemental Provisions and the Premises Lease Contract, the provisions
         in the Supplemental Provisions shall prevail.
<PAGE>   11
9.       New Focus, Inc. will apply for establishing Wholly Foreign Owned
         Enterprise (W.F.O.E.) in Shenzhen PRC, after New Focus, Inc. signs the
         Lease Contract and Supplemental Provision. When this enterprise is
         established and a Business License issued by the government, the new
         titled company will carry out Lease Contract and Supplemental Provision
         instead of New Focus, Inc. Party A will conducts the relevant
         administrative formalities at the Contract registration authority
         within 5 days.

Lessor (Party A):  Shenzhen New and High Tech Village Development Company
                   Shenzhen New and High Tech Village,
                   Shennan, Dadao
                   Nanshan District, Shenzhen, PRC

Signature: Linbo

Print Name:

Title:

Date: 9/13/99

Lessee (Party B): New Focus, Inc.
                  2630 Walsh Ave.
                  Santa Clara, CA 95051
                  U.S.A.

Signature: Ken /s/ Signature Illegible

Print Name: Kenneth E. Westrick

Title: President & CEO

Date: 23 Sep. 99<PAGE>   1
                                                                   Exhibit 10.10

                                 NEW FOCUS, INC.

            FIFTH AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

         THIS FIFTH AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this
"RIGHTS AGREEMENT") is entered into as of December 28, 1999, by and among New
Focus, Inc., a California corporation (the "COMPANY"); Milton Chang and Chang
Partners, a California Limited Partnership (together the "SERIES A HOLDERS");
Venture Lending and Leasing II, Inc., a Maryland corporation ("VENTURE LENDING
AND LEASING"), holders of shares of Series D Preferred Stock of the Company (the
"SERIES D PREFERRED"), holders of shares Series E Preferred Stock of the Company
(the "SERIES E PREFERRED"), holders of shares of Series F Preferred Stock of the
Company (the "SERIES F PREFERRED"), holders of Series G Preferred Stock of the
Company and the additional purchasers (the "ADDITIONAL SERIES G PURCHASERS") of
shares of the Series G Preferred pursuant to that certain Series G Stock
Purchase Agreement dated November 23, 1999 and December 7, 1999.

                                    RECITALS:
                                    --------

         A. The Company, the Series A Holders, holders of Series D Preferred,
Series E Preferred, Series F Preferred and Series G Preferred entered into that
certain the Fourth Amended Registration Rights Agreement, dated as of November
23, 1999, setting forth their agreement and understandings with respect to
certain rights and privileges accompanying the shares of the Series A Preferred
Stock (the "SERIES A PREFERRED"), the Series D Preferred, the Series E
Preferred, Series F Preferred and Series G Preferred (the "PRIOR REGISTRATION
RIGHTS AGREEMENT").

         B. The obligations of each of the Additional Series G Purchasers to
purchase their respective amounts of Series G Preferred shares is conditioned
upon, among other things, the execution and delivery of this Rights Agreement by
each of the Additional Series G Purchasers, the Company and the requisite
signatories to the Prior Registration Rights Agreement.

         C. The Company, the Series A holders, the Series D holders, the Series
E holders, the Series F holder and the Series G Holders desire to amend and
restate the Prior Registration Rights Agreement to contain the rights set forth
herein.

                                      -1-
<PAGE>   2
                                   AGREEMENT:
                                    ---------

         NOW, THEREFORE, in consideration for and of the foregoing and of the
mutual promises, covenants and conditions set forth herein and other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereby agree as follows:

         1. Registration Rights.

                  1.1 Definitions. As used in this Rights Agreement, the
following terms shall have the following respective meanings:

                           (a) The terms "REGISTER," "REGISTERED" and
"REGISTRATION" refer to a registration effected by preparing and filing a
registration statement in compliance with the Securities Act of 1933, as amended
(the "SECURITIES ACT"), and the declaration or ordering of the effectiveness of
such registration statement.

                           (b) The term "REGISTRABLE SECURITIES" means (i) any
and all shares of common stock of the Company ("COMMON STOCK") issued or
issuable upon conversion of the Series A Preferred, Series D Preferred, Series E
Preferred, Series F Preferred and Series G Preferred (the "CONVERSION SHARES"),
(ii) any and all shares of Common Stock or other securities issued or issuable
in respect of the Series A Preferred, Series D Preferred, Series E Preferred,
Series F Preferred and Series G Preferred, and (iii) any and all shares of
Common Stock or other securities issued or issuable upon any conversion of the
Series A Preferred, Series D Preferred, Series E Preferred, Series F Preferred
and Series G Preferred upon any stock split, stock dividend, recapitalization or
similar event; provided, however, that any and all shares described in clauses
(i)-(iii) above which have been resold to the public shall cease to be
Registrable Securities upon such resale and any shares as to which registration
rights have terminated pursuant to Section 1.13 below shall cease to be
Registrable Securities upon such termination.

                           (c) The terms "HOLDER" or "HOLDERS" means any person
or persons to whom Registrable Securities were originally issued, or will be
issued, or qualifying transferees under subsection 1.10 hereof who hold
Registrable Securities.

                           (d) The term "SERIES A INITIATING HOLDERS" means any
Holder or Holders holding fifty percent (50%) or greater of the aggregate of the
Series A Preferred or Common Stock issued or issuable upon conversion thereof.

                           (e) The term "SERIES D, E, F, G INITIATING HOLDERS"
means any Holder or Holders holding fifty percent (50%) or greater of the
aggregate of the Series D Preferred, Series E

                                      -2-
<PAGE>   3
Preferred, Series F Preferred and Series G Preferred or Common Stock issued or
issuable upon conversion thereof.

                           (f) The term "SEC" means the Securities and Exchange
Commission.

                           (g) The term "REGISTRATION EXPENSES" shall mean all
expenses incurred by the Company in complying with subsections 1.2, 1.3 and 1.4
hereof, including, without limitation, all registration, qualification and
filing fees, printing expenses, escrow fees, fees and disbursements of counsel
for the Company, reasonable fees and disbursements of one counsel for all
Holders which are selling Registrable Securities under such registration
statement, blue sky fees and expenses, and the expense of any special audits
incident to or required by any such registration (but excluding the compensation
of regular employees of the Company which shall be paid in any event by the
Company).

                           (h) The term "SERIES A HOLDER AFFILIATES" means any
of the mother, father, descendants, brother(s), sister(s), or spouse of the
Series A Holders or to any trustee or trustees for the benefit of any one or
more of the foregoing (including such mother, father, brother(s), sister(s) or
spouse).

                  1.2 Demand Registration.

                           (a) Series A Initiating Holders and Series D,E,F,G
Initiating Holders Request for Registration. In case the Company shall receive
from the Series A Initiating Holders or the Series D, E, F, G Initiating Holders
a written request that the Company effect a registration with respect to
Registrable Securities other than the Common Stock, with respect to the lesser
of (i) 20% of the outstanding Registrable Securities, or (ii) the reasonably
anticipated aggregate price to the public of which (net of underwriting
discounts and commissions) would be equal to at least Ten Million Dollars
($10,000,000), the Company will:

                                    (i) within ten (10) days give written notice
of the proposed registration to all other Holders; and

                                    (ii) as soon as practicable, use its best
efforts to effect all such registrations (including, without limitation, the
execution of an undertaking to file post-effective amendments, appropriate
qualifications under the applicable blue sky or other state securities laws and
appropriate compliance with exemptive regulations issued under the Securities
Act and any other governmental requirements or regulations) as may be so
requested and as would permit or facilitate the sale and distribution of all or
such portion of such Series A Initiating Holders' or Series D,E,F,G Initiating
Holders', as the case may be, Registrable Securities as are specified in such
request, together with all or such portion of the Registrable Securities of any
Holder or Holders joining in such request as are specified in a written request
given within thirty (30) days after receipt of such written notice from the
Company; provided, however, that the Company shall not be obligated to take any
action to effect such registration pursuant to this subsection 1.2(a):

                                      -3-
<PAGE>   4
                                             (A) at any time prior to the
earlier to occur of (i) May 31, 2002 or (ii) six (6) months following the
effective date of the registration statement under the Securities Act for the
Company's initial registered underwritten public offering of its securities to
the general public (other than a registration statement relating either to the
sale of securities to employees of the Company pursuant to a stock option, stock
purchase or similar plan or a SEC Rule 145 transaction) (the "IPO");

                                             (B) in any particular jurisdiction
in which the Company would be required to execute a general qualification or
compliance unless the Company is already subject to service in such jurisdiction
and except as required by the Securities Act; or

                                             (C) after the Company has effected
two (2) such registrations pursuant to this subsection 1.2(a) and such
registration has been declared or ordered effective.

         Subject to the foregoing clauses (A) through (C), the Company shall
file a registration statement covering the Registrable Securities so requested
to be registered as soon as practical, but in any event within ninety (90) days,
after receipt of the request or requests of the Series A Initiating Holders or
the Series D,E,F,G Initiating Holders, as the case may be; provided, however,
that if the Company shall furnish to such Initiating Holders, a certificate
signed by the President of the Company stating that in the good faith judgment
of the Company's board of directors (the "BOARD OF DIRECTORS"), it would be
detrimental to the Company and its shareholders for such registration statement
to be filed on or before the date filing would be required, and it is therefore
essential to defer the filing of such registration statement, the Company shall
have the right to defer such filing for a period of not more than ninety (90)
days after the furnishing of such a certificate of deferral; and provided
further, however, that the Board of Directors shall not exercise such right to
defer a filing more than once in any consecutive twelve (12) month period.

                           (b) Underwriting. If the Series A Initiating Holders
or the Series D, E, F, G Initiating Holders intend to distribute the Registrable
Securities covered by their request by means of an underwriting, they shall so
advise the Company as part of their request made pursuant to subsection 1.2(a),
and the Company shall include such information in the written notice referred to
in subsection 1.2(a)(i). In such event, the underwriter shall be selected by the
Company and shall be reasonably acceptable to a majority in interest of the
Series A Initiating Holders or of the Series D, E, F, G Initiating Holders, as
the case may be. The right of any Holder to registration pursuant to subsection
1.2 shall be conditioned upon such Holder's participation in such underwriting
and the inclusion of such Holder's Registrable Securities in the underwriting
(unless otherwise mutually agreed by a majority in interest of the Initiating
Holders and such Holder) to the extent provided herein. The Company shall
(together with all Holders proposing to distribute their securities through such
underwriting) enter into an underwriting agreement in customary form with the
underwriter or underwriters. Notwithstanding any other provision of this
subsection 1.2, if the underwriter advises the

                                      -4-
<PAGE>   5
Series A Initiating Holders or Series D, E, F, G Initiating Holders, as the case
may be, in writing that marketing factors require a limitation of the number of
shares to be underwritten, such Initiating Holders shall so advise all Holders,
and the number of shares of Registrable Securities that may be included in the
registration and underwriting shall be allocated among all Holders thereof in
proportion, as nearly as practicable, to the respective amounts of Registrable
Securities held by such Holders; provided, however, that the number of shares of
Registrable Securities to be included in such underwriting shall not be reduced
unless all other securities are first entirely excluded from the underwriting.
If any Holder of Registrable Securities disapproves of the terms of the
underwriting, such Holder may elect to withdraw therefrom by written notice to
the Company, the underwriter and the Initiating Holders. Any Registrable
Securities which are excluded from the underwriting by reason of the
underwriter's marketing limitation or withdrawn from such underwriting shall be
withdrawn from such registration.

                           (c) Company Shares. If the managing underwriter has
not limited the number of Registrable Securities to be underwritten, the Company
may include securities for its own account or for the account of others in such
registration if the managing underwriter so agrees and if the number of
Registrable Securities which would otherwise have been included in such
registration and underwriting will not thereby be limited, and the price per
share to be received for the Registrable Securities is not otherwise affected.

                  1.3 Company Registration.

                           (a) Registration. If at any time or from time to
time, the Company shall determine to register any of its securities, for its own
account or the account of any of its shareholders, other than a registration on
Form S-8 relating solely to employee stock option or purchase plans, or a
registration on Form S-4 relating solely to an SEC Rule 145 transaction, or a
registration on any other form (other than Form S-1, S-2, S-3 or S-18, or their
successor forms) or any successor to such forms, which does not include
substantially the same information as would be required to be included in a
registration statement covering the sale of Registrable Securities, the Company
will:

                                    (i) within thirty (30) days give to each
Holder written notice thereof; and

                                    (ii) include in such registration (and
compliance), and in any underwriting involved therein, all the Registrable
Securities specified in a written request or requests, made within twenty (20)
days after receipt of such written notice from the Company, by any Holder or
Holders, except as set forth in subsection 1.3(b) below.

                           (b) Underwriting. If the registration of which the
Company gives notice is for a registered public offering involving an
underwriting, the Company shall so advise the Holders as a part of the written
notice given pursuant to subsection 1.3(a)(i). In such event the right of any
Holder to registration pursuant to subsection 1.3 shall be conditioned upon such
Holder's participation in such

                                      -5-
<PAGE>   6
underwriting and the inclusion of such Holder's Registrable Securities in the
underwriting to the extent provided herein. All Holders proposing to distribute
their securities through such underwriting shall (together with the Company and
the other shareholders distributing their securities through such underwriting)
enter into an underwriting agreement in customary form with the underwriter or
underwriters selected for such underwriting by the Company. Notwithstanding any
other provision of this subsection 1.3, if the underwriter determines that
marketing factors require a limitation of the number of shares to be
underwritten, and (i) if such registration is the Company's IPO, the underwriter
may limit the number of Registrable Securities to be included in the
registration and underwriting, or may exclude Registrable Securities entirely
from such registration and underwriting, or (ii) if such registration is other
than the Company's IPO, the underwriter may limit the amount of securities to be
included in the registration and underwriting by the Company's shareholders;
provided, however, the number of Registrable Securities to be included in such
registration and underwriting under this subsection 1.3(b)(ii) shall not be
reduced to less than thirty percent (30%) of the aggregate securities included
in such registration without the prior consent of a majority of Series D, E, F,
G Initiating Holders, voting together as one class, and the prior consent of not
less than a majority of the Registrable Securities proposed to be included in
such registration and underwriting held by all of the Holders, voting together
as one class. The Company shall so advise all Holders of Registrable Securities
which would otherwise be registered and underwritten pursuant hereto, and the
number of shares of Registrable Securities that may be included in the
registration and underwriting shall be allocated among Holders requesting
registration in proportion, as nearly as practicable, to the respective amounts
of Registrable Securities held by each of such Holders as of the date of the
notice pursuant to subsection 1.3(a)(i) above; provided, however, that in no
instance shall shares of any other selling shareholder or Registrable Securities
held by the Series A Holders be included in such registration and underwriting
if such inclusion would reduce the number of shares of Registrable Securities
held by other Holders able to be included in such registration and underwriting.
If any Holder disapproves of the terms of any such underwriting, such Holder may
elect to withdraw therefrom by written notice to the Company and the
underwriter. Any Registrable Securities excluded or withdrawn from such
underwriting shall be withdrawn from such registration.

                  1.4 Form S-3.

                           (a) Series A Preferred. In addition to the rights and
obligations set forth in subsection 1.2(a) above, if Holders of Series A
Preferred holding twenty percent (20%) or more of the Registrable Securities
held by all Series A Holders then outstanding ("SERIES A S-3 HOLDERS") request
that the Company file a registration statement on Form S-3 (or any successor to
Form S-3) for a public offering of shares of Registrable Securities, the
reasonably anticipated aggregate price to the public of which (net of
underwriting discounts and commissions) would exceed One Million Dollars
($1,000,000) and the Company is then a registrant entitled to use Form S-3 to
register the shares for such an offering, the Company shall use its best efforts
to cause such shares to be registered for the offering as soon as practicable on
Form S-3 (or any successor form to Form S-3); provided, however, the Company
shall not be required to effect a registration pursuant to this subsection
1.4(a):

                                      -6-
<PAGE>   7
                                    (i) in any particular jurisdiction in which
the Company would be required to execute a general consent to service of process
in effecting such registration, qualification or compliance unless the Company
is already subject to service in such jurisdiction and except as may be required
by the Securities Act;

                                    (ii) if the Company, within ten (10) days of
the receipt of the request of the Series A S-3 Holders, gives notice of its bona
fide intention to effect the filing of a registration statement with the SEC
within forty-five (45) days of receipt of such request (other than with respect
to a registration statement relating to a Rule 145 transaction, an offering
solely to employees or any other registration which is not appropriate for the
registration of Registrable Securities), and does so file within said forty-five
(45) day period and makes reasonable efforts to cause such registration to
become effective;

                                    (iii) during a period of sixty (60) days
following the effective date of a registration statement;

                                    (iv) if the Company has effected one (1)
registration pursuant to this subsection 1.4(a) within a twelve (12) month
period from the date of such request;

                                    (v) if the Company has already effected five
(5) registrations pursuant to this Section 1.4(a); or

                                    (vi) if the Company shall furnish to such
Series A S-3 Holders a certificate signed by the President of the Company
stating that in the good faith judgment of the Board of Directors, it would be
detrimental to the Company and its shareholders for such registration statement
to be filed on or before the date filing would be required and it is therefore
essential to defer the filing of such registration statement, in which case the
Company shall have the right to defer such filing for a period of not more than
ninety (90) days after the furnishing of such a certificate of deferral;
provided, however, that the Board of Directors shall not exercise such right to
defer a filing more than once in any consecutive twelve (12) month period.

                                    (vii) In the event such Series A S-3 Holders
propose to offer the shares of Registrable Securities pursuant to this
subsection 1.4(a) by means of an underwriting, the proposed underwriter(s) shall
be selected by the Company and be reasonably acceptable to a majority in
interest of the Series A-3 Holders. The Company shall give written notice to all
Holders of the receipt of a request for registration pursuant to this subsection
1.4(a) and shall provide a reasonable opportunity for other Holders to
participate in the registration, provided that if the registration is for an
underwritten offering, the terms of subsection 1.2(c) shall apply to all
participants in such offering.

                           (b) Series D Preferred, Series E Preferred, Series F
Preferred and Series G Preferred. In addition to the rights and obligations set
forth in subsection 1.2(a) above, if Series D Holders, the Series E Holders, the
Series F Holders and Series G Holders together holding twenty

                                      -7-
<PAGE>   8
percent (20%) or more of the Registrable Securities held by all Series D
Holders, Series E Holders, Series F Holders and Series G Purchasers then
outstanding ("SERIES D,E,F,G S-3 HOLDERS") request that the Company file a
registration statement on Form S-3 (or any successor to Form S-3) for a public
offering of shares of Registrable Securities, the reasonably anticipated
aggregate price to the public of which (net of underwriting discounts and
commissions) would exceed One Million Dollars ($1,000,000) and the Company is
then a registrant entitled to use Form S-3 to register the shares for such an
offering, the Company shall use its best efforts to cause such shares to be
registered for the offering as soon as practicable on Form S-3 (or any successor
form to Form S-3); provided, however, the Company shall not be required to
effect a registration pursuant to this subsection 1.4(b):

                                    (i) in any particular jurisdiction in which
the Company would be required to execute a general consent to service of process
in effecting such registration, qualification or compliance unless the Company
is already subject to service in such jurisdiction and except as may be required
by the Securities Act;

                                    (ii) if the Company, within ten (10) days of
the receipt of the request of the Series D,E,F,G S-3 Holders, gives notice of
its bona fide intention to effect the filing of a registration statement with
the SEC within forty-five (45) days of receipt of such request (other than with
respect to a registration statement relating to a Rule 145 transaction, an
offering solely to employees or any other registration which is not appropriate
for the registration of Registrable Securities), and does so file within said
forty-five (45) day period and makes reasonable efforts to cause such
registration to become effective;

                                    (iii) during a period of sixty (60) days
following the effective date of a registration statement;

                                    (iv) if the Company has effected one (1)
registration pursuant to this subsection 1.4(b) within a twelve (12) month
period from the date of such request;

                                    (v) if the Company has already effected five
(5) registrations pursuant to this subsection 1.4(b); or

                                    (vi) if the Company shall furnish to such
Series D,E,F,G S-3 Holders a certificate signed by the President of the Company
stating that in the good faith judgment of the Board of Directors, it would be
detrimental to the Company and its shareholders for such registration statement
to be filed on or before the date filing would be required, and it is therefore
essential to defer the filing of such registration statement, in which case the
Company shall have the right to defer such filing for a period of not more than
ninety (90) days after the furnishing of such a certificate of deferral;
provided, however, that the Board of Directors shall not exercise such right to
defer a filing more than once in any consecutive twelve (12) month period.

                                      -8-
<PAGE>   9
                                    (vii) In the event such Series D,E,F,G S-3
Holders propose to offer the shares of Registrable Securities pursuant to this
subsection 1.4(b) by means of an underwriting, the proposed underwriter(s) shall
be chosen by the Company and shall be reasonably acceptable to a majority of the
Series D,E,F,G S-3 Holders, voting together as a single class. The Company shall
give written notice to all Holders of the receipt of a request for registration
pursuant to this subsection 1.4(b) and shall provide a reasonable opportunity
for other Holders to participate in the registration, provided that if the
registration is for an underwritten offering, the terms of subsection 1.2(c)
shall apply to all participants in such offering.

                  1.5 Expenses of Registration. All Registration Expenses
incurred in connection with any registration pursuant to this Section 1 shall be
borne by the Company except as follows:

                           (a) The Company shall not be required to pay for
expenses of any registration proceeding begun pursuant to subsection 1.2, the
request for which has been subsequently withdrawn by the Series A Initiating
Holders or the Series D,E,F,G Initiating Holders, as the case may be (in which
case, such expenses shall be borne by the Holders requesting such withdrawal),
unless such Holders agree to forfeit their respective rights to registration
pursuant to Section 1.2; provided, however, that if at the time of such
withdrawal the Initiating Holders have learned of a material adverse change in
the condition or business of the Company from that known to the Initiating
Holders at the time of their request and have withdrawn the request with
reasonable promptness following disclosure by the Company of such material
adverse change, the Holders shall not be required to pay and such expenses and
shall retain their rights pursuant to subsection 1.2.

                           (b) The Company shall not be required to pay fees or
disbursements of legal counsel of a Holder unless all the Holders specify one
special counsel.

                           (c) The Company shall not be required to pay
underwriters' fees, discounts or commissions relating to Registrable Securities.

                  1.6 Registration Procedures. In the case of each registration
effected by the Company pursuant to this Rights Agreement, the Company will keep
each Holder participating therein advised in writing as to the initiation of
each registration, qualification and compliance and as to the completion
thereof. Except as otherwise provided in subsection 1.5, at its expense the
Company will:

                           (a) Prepare and file with the SEC a registration
statement with respect to such Registrable Securities and use its best efforts
to cause such registration statement to become effective, and, upon the request
of the Holders of a majority of the Registrable Securities registered
thereunder, keep such registration statement effective for up to one hundred
twenty (120) days or, if a shorter period, until securities included in the
registration statement are sold, provided, however, that (i) such 120 day period
shall be extended for a period of time equal to the period the Holder refrains
from selling any securities included in such registration at the request of an
underwriter of Common Stock (or other securities) of the Company; and (ii) in
the case of any registration of Registrable Securities on Form S-3

                                      -9-
<PAGE>   10
which are intended to be offered on a continuous or delayed basis, such 120 day
period shall be extended, if necessary, to keep the registration statement
effective until all such Registrable Securities are sold, provided that Rule
415, or any successor rule under the Act, permits an offering on a continuous or
delayed basis, and provided further that applicable rules under the Act
governing the obligation to file a post-effective amendment permit, in lieu of
filing a post-effective amendment which (i) includes any prospectus required by
Section 10(a)(3) of the Act or (ii) reflects facts or events representing a
material or fundamental change in the information set forth in the registration
statement, the incorporation by reference of information required to be included
in (i) and (ii) above to be contained in periodic reports filed pursuant to
Section 13 or 15(d) of the 1934 Act in the registration statement.

                           (b) Prepare and file with the SEC such amendments and
supplements to such registration statement and the prospectus used in connection
with such registration statement as may be necessary to comply with the
provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement.

                           (c) Furnish to the Holders such numbers of copies of
a prospectus, including a preliminary prospectus, in conformity with the
requirements of the Securities Act, and such other documents as they may
reasonably request in order to facilitate the disposition of Registrable
Securities owned by them.

                           (d) Use its best efforts to register and qualify the
securities covered by such registration statement under such other securities or
Blue Sky laws of such jurisdictions as shall be reasonably requested by the
Holders, provided that the Company shall not be required in connection
therewith, or as a condition thereto, to qualify to do business or to file a
general consent to service of process in any such states or jurisdictions.

                           (e) In the event of any underwritten public offering,
enter into and perform its obligations under an underwriting agreement, in usual
and customary form, with the managing underwriter of such offering. Each Holder
participating in such underwriting shall also enter into and perform its
obligations under such an agreement.

                           (f) Notify each Holder of Registrable Securities
covered by such registration statement at any time when a prospectus relating
thereto is required to be delivered under the Securities Act or the happening of
any event as a result of which the prospectus included in such registration
statement, as then in effect, includes an untrue statement of a material fact or
omits to state a material fact required to be stated therein or necessary to
make the statements therein not misleading in the light of the circumstances
then existing.

                           (g) Cause all such Registrable Securities registered
pursuant hereunder to be listed on each securities exchange or quotation system
on which similar securities issued by the Company are then listed.

                                      -10-
<PAGE>   11
                           (h) Furnish, at the request of any Holder requesting
registration of Registrable Securities pursuant to this Section 1, on the date
that such Registrable Securities are delivered to the underwriters for sale in
connection with a registration pursuant to this Section 1, if such securities
are being sold through underwriters, or, if such securities are not being sold
through underwriters, on the date that the registration statement with respect
to such securities becomes effective, (i) an opinion, dated such date, of the
counsel representing the Company for the purposes of such registration, in form
and substance as is customarily given to underwriters in an underwritten public
offering, addressed to the underwriters, if any, and to the Holders requesting
registration of Registrable Securities and (ii) a letter dated such date, from
the independent public accountants of the Company, in form and substance as is
customarily given by independent certified public accountants to underwriters in
an underwritten public offering, addressed to the underwriters, if any, and to
the Holders requesting registration of Registrable Securities.

                  1.7 Indemnification.

                           (a) The Company will indemnify and defend each Holder
of Registrable Securities and each of its officers, directors and partners, and
each person controlling such Holder, with respect to which a registration has
been effected pursuant to this Rights Agreement, and each underwriter, if any,
and each person who controls any underwriter of the Registrable Securities held
by or issuable to such Holder, against all claims, losses, expenses, damages and
liabilities (or actions in respect thereto) arising out of or based on any
untrue statement (or alleged untrue statement) of a material fact contained in
any registration statement or prospectus incident to such registration, or based
on any omission (or alleged omission) to state therein a material fact required
to be stated therein or necessary to make the statement therein not misleading,
or any violation or alleged violation by the Company of the Securities Act, the
Securities Exchange Act of 1934, as amended, ("EXCHANGE ACT") or any state
securities law applicable to the Company or any rule or regulation promulgated
under the Securities Act, the Exchange Act or any such state law and relating to
action or inaction required of the Company in connection with any such
registration, and will reimburse each such Holder, each of its officers,
directors and partners, and each person controlling such Holder, each such
underwriter and each person who controls any such underwriter, as incurred for
any reasonable legal and any other expenses incurred in connection with
investigating, defending or settling any such claim, loss, damage, liability or
action; provided, however, that the indemnity agreement contained in this
subsection 1.7(a) shall not apply to amounts paid in settlement of any such
claim, loss, damage, liability, or action if such settlement is effected without
the consent of the Company (which consent shall not be unreasonably withheld);
and provided further, that the Company will not be liable in any such case to
the extent that any such claim, loss, damage or liability arises out of or is
based on any untrue statement or omission based upon written information
furnished to the Company by an instrument duly executed by such Holder
specifically for use therein; and provided further, however, that the indemnity
agreement contained in this subsection 1.7(a) shall not apply to a Holder who is
either (i) an officer listed as an executive officer in the registration
statement or prospectus incident to such registration statement or (ii) a
director of the Company at the time of the statement, omission, or violation (a
"MANAGEMENT HOLDER") unless such Management Holder has sold shares included in
the registration statement.

                                      -11-
<PAGE>   12
                           (b) Each Holder will, if Registrable Securities held
by or issuable to such Holder are included in the securities as to which such
registration is being effected, indemnify and defend the Company, each of its
directors and officers, each underwriter, if any, of the Company's securities
covered by such a registration statement, each person who controls the Company
within the meaning of the Securities Act, and each other such Holder, each of
its officers, directors and partners and each person controlling such Holder,
against all claims, losses, expenses, damages and liabilities (or actions in
respect thereof) arising out of or based on any untrue statement (or alleged
untrue statement) of a material fact contained in any registration statement or
prospectus incident to such registration, or any omission (or alleged omission)
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, and will reimburse the Company, such
Holders, such directors, officers, partners, persons or underwriters for any
reasonable legal or any other expenses incurred in connection with
investigating, defending or settling any such claim, loss, damage, liability or
action, in each case to the extent, but only to the extent, that such untrue
statement (or alleged untrue statement) or omission (or alleged omission) is
made in such registration statement or prospectus in reliance upon and in
conformity with written information furnished to the Company by the Holder in an
instrument duly executed by such Holder specifically for use therein; provided,
however, that the indemnity agreement contained in this subsection 1.7(b) shall
not apply to amounts paid in settlement of any such claim, loss, damage,
liability or action if such settlement is effected without the consent of the
Holder (which consent shall not be unreasonably withheld); and provided further,
that the total amount for which any Holder shall be liable under this subsection
1.7(b) shall not in any event exceed the aggregate proceeds received by such
Holder from the sale of Registrable Securities held by such Holder in such
registration net of underwriter's commissions and discounts.

                           (c) Each party entitled to indemnification under this
subsection 1.7 (the "INDEMNIFIED PARTY") shall give notice to the party required
to provide indemnification (the "INDEMNIFYING PARTY") promptly after such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom; provided, however, that
counsel for the Indemnifying Party, who shall conduct the defense of such claim
or litigation, shall be approved by the Indemnified Party (whose approval shall
not be unreasonably withheld), and the Indemnified Party may participate in such
defense at its own expense; and provided further, that the failure of any
Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations hereunder, unless such failure resulted in
prejudice to the Indemnifying Party; and provided further, however, that an
Indemnified Party (together with all other Indemnified Parties which may be
represented without conflict by one counsel) shall have the right to retain one
separate counsel, with the fees and expenses to be paid by the Indemnifying
Party, if representation of such Indemnified Party by the counsel retained by
the Indemnifying Party would be inappropriate due to a conflict of interests
between such Indemnified Party and any other party represented by such counsel
in such proceeding. No Indemnifying Party, in the defense of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any settlement which does not

                                      -12-
<PAGE>   13
include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party of a release from all liability in respect to such
claim or litigation.

                           (d) If the indemnification provided for in this
Section 1.7 is held by a court of competent jurisdiction to be unavailable to an
Indemnified Party with respect to any losses, claims, damages or liabilities
referred to herein, the Indemnifying Party, in lieu of indemnifying such
Indemnified Party thereunder, shall to the extent permitted by applicable law,
contribute to the amount paid or payable by such Indemnified Party as a result
of such loss, claim, damage or liability in such proportion as is appropriate to
reflect the relative fault of the Indemnifying Party on the one hand and of the
Indemnified Party on the other in connection with the violation(s) that resulted
in such loss, claim, damage or liability, as well as any other relevant
equitable considerations. The relative fault of the Indemnifying Party and of
the Indemnified Party shall be determined by a court of law by reference to,
among other things, whether the untrue or alleged untrue statement(s) of a
material fact or the omission(s) to state a material fact relates to information
supplied by the Indemnifying Party or by the Indemnified Party and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission; provided, that in no event shall any
contribution by a Holder hereunder exceed the net proceeds from the offering
received by such Holder.

                           (e) The obligations of the Company and Holders under
this Section 1.7 shall survive completion of any offering of Registrable
Securities in a registration statement and the termination of this Rights
Agreement. No Indemnifying Party, in the defense of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect to such claim or
litigation.

                           (f) The indemnification provided for in this Section
1.7 shall be superseded by indemnification provided for in an underwriting
agreement entered into by the Company and an underwriter of Registrable
Securities with respect to which a registration has been effected pursuant to
this Rights Agreement.

                  1.8 Information by Holder. Any Holder or Holders of
Registrable Securities included in any registration shall promptly furnish to
the Company such information regarding such Holder or Holders and the
distribution proposed by such Holder or Holders as the Company may request in
writing and as shall be required in connection with any registration,
qualification or compliance referred to herein.

                  1.9 Rule 144 Reporting. With a view to making available to
Holders the benefits of certain rules and regulations of the SEC which may
permit the sale of the Registrable Securities to the public without
registration, the Company agrees at all times to:

                                      -13-
<PAGE>   14
                           (a) make and keep public information available, as
those terms are understood and defined in SEC Rule 144, after ninety (90) days
after the effective date of the first registration filed by the Company for an
offering of its securities to the general public;

                           (b) take such action, including the voluntary
registration of its common stock, under Section 12 of the 1934 Act, as is
necessary to enable the Holders to utilize Form S-3 for the sale of their
Registrable Securities, such action to be taken as soon as practicable after the
end of the fiscal year in which the registration statement filed by the Company
for the offering of its Securities to the general public is declared effective;

                           (c) file with the SEC in a timely manner all reports
and other documents required of the Company under the Securities Act and the
Exchange Act (at any time after it has become subject to such reporting
requirements); and

                           (d) so long as a Holder owns any Registrable
Securities, to furnish to such Holder forthwith upon request a written statement
by the Company as to its compliance with the reporting requirements of said Rule
144 (at any time after ninety (90) days after the effective date of the first
registration statement filed by the Company for an offering of its securities to
the general public), and of the Securities Act and the Exchange Act (at any time
after it has become subject to such reporting requirements), a copy of the most
recent annual or quarterly report of the Company, and such other reports and
documents so filed by the Company as the Holder may reasonably request in
complying with any rule or regulation of the SEC allowing the Holder to sell any
such securities without registration.

                  1.10 Transfer of Registration Rights. Holders' rights to cause
the Company to register their securities and keep information available, granted
to them by the Company under subsections 1.2, 1.3, 1.4 and 1.9, may be assigned
to a transferee or assignee of at least one hundred fifty thousand (150,000)
shares (as adjusted for stock splits, stock dividends, recapitalization and like
events) of a Holder's Registrable Securities not sold to the public, provided
that the Company is given written notice by such Holder at the time of, or
within a reasonable time after, said transfer, stating the name and address of
said transferee or assignee and identifying the securities with respect to which
such registration rights are being assigned. The Company may prohibit the
transfer of any Holders' rights under this subsection 1.10 to any proposed
transferee or assignee who the Company reasonably believes is a competitor of
the Company. Notwithstanding anything else in this subsection 1.10, any Holder
may transfer rights to a transferee of fewer than one hundred fifty thousand
(150,000) shares (as adjusted for stock splits, stock dividends,
recapitalizations and like events) of a Holder's Registrable Securities if such
transferee is a subsidiary, parent, shareholder, member, general partner,
limited partner, associated entity or a retired partner of such Holder.

                  1.11 Limitations on Subsequent Registration Rights. From and
after the date hereof, the Company shall not, without the prior written consent
of a majority of the Registrable Securities held by the Holders of Series A
Preferred or Common Stock issued or issuable upon conversion thereof, and a
majority of the Registrable Securities held by the Holders of Series D, Series E
Preferred, Series F

                                      -14-
<PAGE>   15
Preferred and Series G Preferred, voting together as one class, or Common Stock
issued or issuable upon conversion thereof (which consent will not be
unreasonably withheld) enter into any agreement, with any Holder or prospective
Holder of any securities of the Company which would allow such Holder or
prospective Holder to demand any registration or include such securities in any
registration filed under subsections 1.2, 1.3 or 1.4 hereof if such inclusion
would adversely affect the rights of any Holder (or any qualifying transferee
under subsection 1.10) under such subsections, including reducing the number of
shares of Registrable Securities of a Holder able to be included in any
registration.

                  1.12 "Market Stand-Off" Agreement.

                           (a) Each Holder hereby agrees that, in connection
with the IPO, during the period of duration (not to exceed one hundred eighty
(180) days) specified by the Company and an underwriter of common stock or other
securities of the Company following the effective date of a registration
statement of the Company filed under the Securities Act, it shall not, to the
extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including, without limitation, any short
sale), grant any option to purchase, pledge or otherwise transfer or dispose of
(other than to donees who agree to be similarly bound) any securities of the
Company held by it at any time during such period except common stock included
in such registration; provided, however, that such agreement shall not be
required unless all officers and directors of the Company and all holders of
five percent or more of the Company's outstanding capital stock (on a
common-equivalent basis) enter into similar agreements.

                           (b) Each holder of 5% or more of the Registrable
Securities at the time of any offering other than the IPO, hereby agrees that,
in connection with such other offering, during the period of duration (not to
exceed 90 days) specified by the Company and an underwriter of common stock or
other securities of the Company following the effective date of a registration
statement of the Company filed under the Securities Act, it shall not, to the
extent requested by the Company and such underwriter, directly or indirectly
sell, offer to sell, contract to sell (including, without limitation, any short
sale), grant any option to purchase, pledge or otherwise transfer or dispose of
(other than to donees who agree to be similarly bound) any securities of the
Company held by it at any time during such period except common stock included
in such registration.

         In order to enforce the foregoing covenants contained in subsections
1.12(a) and 1.12(b), the Company may impose stop-transfer instructions with
respect to the Registrable Securities of each Holder (and the shares of
securities of every other person subject to the foregoing restriction) until the
end of each such period of duration.

                           (c) Notwithstanding any provision of this Rights
Agreement to the contrary, Holders shall not be prohibited by the Company
(except as prohibited by law) from acquiring or disposing of any shares of the
Company offered or traded in the public market, including those shares offered
in the IPO and traded thereafter or in any market that may develop pursuant to
Rule 144A of the

                                      -15-
<PAGE>   16
Securities Act, but excluding any shares of the Company held by Holders at the
time immediately prior to the IPO, to which this subsection 1.12(c) does not
apply.

                  1.13 Termination of Registration Rights. The obligations of
the Company pursuant to this Section 1 ("REGISTRATION RIGHTS") shall terminate
with respect to any Holder on the earlier of (i) the date five (5) years after
the closing of the IPO, or (ii) the date on which the Holder can sell all of
his/her remaining Registrable Securities under Rule 144 during any three (3)
month period.

         2.0 Holders' Right of First Offer.

                  2.1 If, at any time prior to the termination of this right of
first offer pursuant to subsection 2.6, the Company should desire to issue in a
transaction not registered under the Securities Act in reliance upon a claimed
exemption thereunder, any Equity Securities (as defined in Section 2.7 below),
it shall give the Series A Holders and each Holder of at least 150,000 shares of
Series D Preferred (or Common Stock issuable upon conversion thereof), each
holder of at least 200,000 shares of Series E Preferred Stock (or Common Stock
issuable upon conversion thereof), each holder of at least 200,000 shares of
Series F Preferred Stock (or Common Stock issuable upon conversion thereof) and
each holder of at least 200,000 shares of Series G Preferred (or Common Stock
issuable on conversion thereof) (each individually referred to herein as a
"RIGHTS HOLDER" and, collectively, as "RIGHTS HOLDERS") the right to purchase
such Rights Holder's pro rata share (or any part thereof) of all of such
privately offered Equity Securities on the same terms as the Company is willing
to sell such Equity Securities to any other person. Each Rights Holder's pro
rata share of the Equity Securities shall be equal to that percentage of the
outstanding Common Stock then held by such Rights Holder. For purposes of this
subsection 2.1, the outstanding Common Stock shall include (a) outstanding
shares of Common Stock, and (b) shares of Common Stock issued or issuable upon
exercise and/or conversion of any then outstanding options, warrants, Series A
Preferred, Series B Preferred, Series C Preferred, Series D Preferred, Series E
Preferred, Series F Preferred Stock, Series G Preferred Stock or any other
securities convertible into Common Stock.

                  2.2 Prior to any sale or issuance by the Company of any Equity
Securities, the Company shall notify each Rights Holder in writing of its
intention to sell and issue such securities, setting forth the terms under which
it proposes to make such sale. Within twenty (20) days after receipt of such
notice, each Rights Holder shall notify the Company in writing whether such
Rights Holder desires to exercise the option to purchase such Rights Holder's
pro rata share (or any part thereof) of the Equity Securities so offered. If a
Rights Holder elects to purchase such Rights Holder's pro rata share, then such
Rights Holder shall have a right of over-allotment such that if any other Rights
Holder fails to purchase such Rights Holder's pro rata share of the Equity
Securities, such Rights Holder(s) who have elected to purchase their pro rata
shares may purchase, on a pro rata basis, that portion of the Equity Securities
which such other Rights Holders elected not to purchase.

                  2.3 After termination of the twenty (20) day period specified
in subsection 2.2 above, the Company may, during a period of sixty (60) days
following the end of such twenty (20) day period,

                                      -16-
<PAGE>   17
sell and issue such Equity Securities as to which (a) the Rights Holders have no
right under this Section 2 to purchase, and (b) the Rights Holders do not
indicate a desire to purchase, to another person upon the same terms and
conditions as those set forth in the notice to the Rights Holders. In the event
the Company has not sold the Equity Securities, or has not entered into an
agreement to sell the Equity Securities, within said eighty (80) day period, the
Company shall not thereafter issue or sell any Equity Securities without first
offering such securities to the Rights Holders in the manner provided above.

                  2.4 If a Rights Holder gives the Company written notice that
such Rights Holder desires to purchase any of the Equity Securities offered by
the Company, payment for the Equity Securities shall be by check, or wire
transfer, against delivery of the Equity Securities at the executive offices of
the Company within ten (10) days after giving the Company such notice, or, if
later, the closing date for the sale of such Equity Securities. The Company
shall take all such actions as may be required by any regulatory authority in
connection with the exercise by a Rights Holder of the right to purchase Equity
Securities as set forth in this Section 2.

                  2.5 The right of first offer contained in this Section 2 shall
not apply to the issuance by the Company of the following Equity Securities: (a)
Common Stock reserved for issuance to employees, consultants, directors or
officers of the Company pursuant to stock grant, stock purchase and/or stock
option plans or any other stock incentive program, agreement or arrangement
approved by the Board of Directors, (b) as part of an acquisition by the Company
of all or substantially all of the assets or shares of another company or entity
whether through a merger, exchange, reorganization or the like, (c) pursuant to
equipment financing or leasing arrangements or in connection with strategic
partnering transactions approved by the Board of Directors, (d) issued upon
conversion of the Company's Series A Preferred, Series B Preferred, Series C
Preferred, Series D Preferred, Series E Preferred, Series F Preferred or Series
G Preferred, (e) issued in connection with any stock split, stock dividend,
recapitalization or similar event or (f) issued in connection with an
underwritten public offering of shares of the Company's capital stock.

                  2.6 The right of first offer contained in this Section 2 shall
terminate upon the earlier to occur of (a) the closing of the IPO or (b) the
closing of (i) a merger or consolidation of the Company with or into any other
corporation in which the Company's shareholders shall own less than fifty
percent (50%) of the voting securities of the surviving corporation or (ii) a
sale, transfer, or disposition of all or substantially all of the assets of the
Company, but only if the Company"s shareholders receive cash and/or publicly
traded securities as consideration in such merger, consolidation or sale,
transfer or disposition of assets.

                  2.7 The term "EQUITY SECURITIES" shall mean (a) Common Stock
or Preferred Stock, rights, options or warrants to purchase Common Stock or
Preferred Stock, (b) any security other than Common Stock or Preferred Stock
having voting rights in the election of the Board of Directors, (c) any security
convertible into or exchangeable for any of the foregoing except that Equity
Securities shall not include the Series A Preferred, the Series B Preferred, the
Series C Preferred, Series D Preferred, Series

                                      -17-
<PAGE>   18
E Preferred, Series F Preferred or Series G Preferred and (d) any agreement or
commitment to issue any of the foregoing.

                  2.8 A Rights Holder's right to purchase any Equity Securities
pursuant to this Section 2 may be assigned by a Rights Holder to an affiliate of
a Rights Holder. For the purposes of this Section 2, an "AFFILIATE" shall mean
any partner or shareholder of a Rights Holder or any person or entity that
directly or indirectly through one or more intermediaries controls or is
controlled by or is under common control with a Rights Holder.

         3.0      Information Rights.

                  3.1 Annual Financial Information. As soon as practicable after
the end of each fiscal year, and in any event within ninety (90) days
thereafter, the Company will furnish to each Holder, so long as such Holder
still holds shares of Series A Preferred, Series B Preferred, Series D
Preferred, Series E Preferred, Series F Preferred or Series G Preferred, audited
financial statements, including consolidated balance sheets of the Company and
its subsidiaries, if any, as at the end of such fiscal year and consolidated
statements of income and surplus and consolidated statements of changes in
financial position of the Company and its subsidiaries, if any, for such year,
prepared in accordance with generally accepted accounting principles and setting
forth in each case in comparative form the figures for the previous fiscal year
and setting forth in each case in comparative form the Company's budget for such
period.

                  3.2 Quarterly Financial Information. As soon as available and
in any event within forty-five (45) days after the first three quarterly
accounting periods, the Company will provide Holders of 150,000 or more shares
of Preferred Stock unaudited quarterly income statement, statement of cash flows
and a balance sheet for and as of such period and setting forth in each case in
comparative form the Company's budget for such period.

                  3.3 Monthly Financial Information. As soon as available and in
any event within thirty (30) days after the end of each month, the Company will
provide Holders of 150,000 or more shares of Preferred Stock unaudited income
statement, statement of cash flows and a balance sheet for and as of the end of
such month and setting forth in each case in comparative form the Company's
budget for such period.

                  3.4 Budget and Business Plan. As soon as available and in any
event within thirty (30) days prior to the end of each fiscal year, the Company
will provide Holders of 150,000 or more shares of Preferred Stock a budget and
business plan for the next fiscal year.

                  3.5 Confidentiality of Information. Each Holder agrees that
all disclosures and exchange of information between the Company and the Holder
(including, without limitation, any exchange of information with any Holder in
connection with rights to observe the Board of Directors) will not be disclosed
to any person or entity without the prior written consent of the

                                      -18-
<PAGE>   19
Company; provided, however, that such consent shall not be unreasonably withheld
and that notwithstanding the foregoing, each Holder may disclose such
information without the prior written consent of the Company to (i) its
partners, shareholders, legal counsel, professional accountants, associates or
employees in order to evaluate this investment and as may be necessary to
continue to evaluate the Company or (ii) pursuant to and only to the extent
required law. Each Holder agrees that any recipient of information obtained by
the Holder shall agree to be bound by the provisions of this subsection 3.5 with
respect to such information; provided, however, that notwithstanding the
foregoing, the Holders may include summary financial information concerning the
Company and general statements concerning the nature and progress of the
Company's business in their reports to their limited partners. Each Holder's
obligations under this subsection 3.5 shall not apply to any information which:

                       (a) was in the public domain at the time it was
communicated to the Holder by the Company;

                       (b) entered the public domain subsequent to the time it
was communicated to the Holder through no fault of the Holder; (

                       c) was in the Holder's possession free of any obligation
of confidence at the time it was communicated to the Holder by the Company,
other than information provided or made available to the Holder in connection
with the Holder's investment in the Series G Preferred Shares pursuant to this
Agreement;

                       (d) was rightfully communicated to the Holder by a third
party free of any obligation of confidence subsequent to the time it was
communicated to the Holder by the Company;

                       (e) was disclosed by the Holder in response to a valid
order by a court or other governmental body, was otherwise required by law, or
was necessary to establish the rights of either party under this Agreement; or

                       was independently developed by the Holder without using
the confidential information of the Company.

                  3.6 Inspection. The Company shall permit Holders holding
150,000 or more shares of Series D Preferred, 250,000 or more shares of Series E
Preferred, 250,000 or more shares of Series F Preferred, or 250,000 or more
shares of Series G Preferred to visit and inspect the Company's properties, to
examine its books of account and records and to discuss the Company's affairs,
finances and accounts with its officers, all at such reasonable times as may be
requested by the Holder; provided, however, that the Company shall not be
obligated pursuant to this Section 3.6 to provide access to any information
which the Company reasonably considers to be a trade secret or similar
confidential information.

                                      -19-
<PAGE>   20
                  3.7 Observer Rights. As long as London Pacific Life & Annuity
Company owns not less than one million (1,000,000) shares of Series G Preferred
Stock (or an equivalent amount of Common Stock issued upon conversion thereof),
the Company shall invite a representative of London Pacific Life & Annuity
Company to attend all meetings of its Board of Directors in a nonvoting,
observer capacity and, in this respect, shall give such representative copies of
all notices, minutes, consents and other materials that it provides to its
directors; provided, however, that such representative shall agree to hold in
confidence and trust and to act in a fiduciary manner with respect to all
information so provided; and, provided further, that the Company reserves the
right to withhold any information and to exclude such representative from any
meeting or portion thereof if a majority of the Board reasonably believes that
the representative's attendance at such meeting or access to such information
would: (i) adversely affect attorney-client privilege between the Company and
its counsel or (ii) involve a conflict of interest between the Company and
London Pacific Life & Annuity Company on a material issue for the Company.

                  3.8 Termination of Covenants. The covenants set forth in
subsections 3.1, 3.2, 3.3, 3.4 and 3.7 shall terminate and be of no further
force and effect upon the earlier to occur of: (i) the IPO; (ii) the closing of
a merger or consolidation of the Company with or into any other corporation in
which the Company's shareholders shall own less than fifty percent (50%) of the
voting securities of the surviving corporation; or (iii) the closing of a sale,
transfer or disposition of all or substantially all of the Company's assets. The
confidentiality provisions of Sections 3.5 and 3.7, however, shall survive any
such termination.

         4.0      General.

                  4.1 Waivers and Amendments. With the written consent of the
record or beneficial holders of at least sixty percent (60%) of the Registrable
Securities held by the Holders of the Series D Preferred, the Series E
Preferred, the Series F Preferred and the Series G Preferred, voting together as
one class, the obligations of the Company and the rights of the Series D
Preferred, the E Preferred, the Series F Preferred and the Series G Preferred
under this Rights Agreement may be waived (either generally or in a particular
instance, either retroactively or prospectively, and either for a specified
period of time or indefinitely). With the written consent of the record or
beneficial holders of a majority of the Registrable Securities held by the
Holders of the Series A Preferred, the obligations of the Company and the rights
of the Series A Preferred under this Rights Agreement may be waived (either
generally or in a particular instance, either retroactively or prospectively,
and either for a specified period of time or indefinitely). With the written
consent of the record or beneficial holders of at least 60% of the Registrable
Securities held by the Holders of the Series D Preferred, the Series E
Preferred, the Series F Preferred and Series G Preferred, voting together as one
class, and a majority of the Registrable Securities Holders held by the Series A
Preferred, the Company, when authorized by resolution of its Board of Directors,
may enter into a supplementary agreement for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
this Rights Agreement; provided, however, that no such modification or amendment
shall reduce the aforesaid majority of Registrable Securities consent
requirement without the consent of all of the Holders of the Registrable
Securities;

                                      -20-
<PAGE>   21
provided, further, that Section 3.7 hereof may only be amended or waived upon
the written consent of London Pacific Life & Annuity Company. Upon the
effectuation of each such waiver, consent, agreement of amendment or
modification, the Company shall promptly give written notice thereof to the
record holders of the Registrable Securities who have not previously consented
thereto in writing. This Rights Agreement or any provision hereof may be
changed, waived, discharged or terminated only by a statement in writing signed
by the party against which enforcement of the change, waiver, discharge or
termination is sought, except to the extent provided in this subsection 4.1.

                  4.2 Additional Shareholders. Subject to the restrictions set
forth in Section 2 hereof, any Holder of Series G Preferred who purchases those
shares from the Company (each, an "ADDITIONAL SHAREHOLDER") may become a party
to this Rights Agreement after the date hereof without the consent of any of the
other parties hereto by executing a counterpart signature page to this Rights
Agreement. As a condition to becoming a party to this Rights Agreement, each
Additional Shareholder hereby agrees (i) that it shall be deemed to be a
"Holder" for all purposes under this Rights Agreement, subject to and bound by
all of the terms and conditions applicable to a "Holder" under this Rights
Agreement, and (ii) to irrevocably terminate and waive all registration or
similar rights applicable to any shares of capital stock in the Company held by
such Additional Shareholder pursuant to any agreement or understanding of any
kind other than those contained in this Rights Agreement, such termination and
waiver to be effective immediately upon such Additional Shareholder's execution
of the counterpart signature page hereto.

                  4.3 Governing Law. This Rights Agreement shall be governed in
all respects by the laws of the State of California as such laws are applied to
agreements between California residents entered into and to be performed
entirely within California.

                  4.4 Successors and Assigns. Except as otherwise expressly
provided herein, the provisions hereof shall inure to the benefit of, and be
binding upon, the successors, assigns, heirs, executors and administrators of
the parties hereto.

                  4.5 Entire Rights Agreement. Except as set forth below, this
Rights Agreement and the other documents delivered pursuant hereto constitute
the full and entire understanding and agreement between the parties with regard
to the subjects hereof and thereof, and this Rights Agreement shall supersede
and cancel all prior agreements between the parties hereto with regard to the
subject matter hereof.

                  4.6 Notices, etc. All notices and other communications
required or permitted hereunder shall be in writing and shall be sent via
facsimile, overnight courier service or mailed by certified mail, postage
prepaid, return receipt requested, addressed or sent (i) if to a Holder, at the
address or facsimile number of the Holder set forth in the Company's records, or
at such other address or number as the Holder shall have furnished to the
Company in writing, or (ii) if to the Company, at 2630 Walsh Avenue, Santa
Clara, California 95051, facsimile: (408) 980-8883, or at such other address or
number as the Company shall have furnished to the Holders in writing, and shall
be effective upon

                                      -21-
<PAGE>   22
(i) delivery if sent by facsimile (with a confirming receipt); (ii) delivery to
an overnight courier service; or (iii) three (3) days after deposit with the
United States Post Office.

                  4.7 Severability. In case any provision of this Rights
Agreement shall be invalid, illegal, or unenforceable, the validity, legality
and enforceability of the remaining provisions of this Rights Agreement or any
provision of the other Agreements shall not in any way be affected or impaired
thereby.

                  4.8 Titles and Subtitles. The titles of the sections and
subsections of this Rights Agreement are for convenience of reference only and
are not to be considered in construing this Rights Agreement.

                  4.9 Counterparts. This Rights Agreement may be executed in any
number of counterparts, each of which shall be an original, but all of which
together shall constitute one instrument.

             [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK.]

                                      -22-
<PAGE>   23
         IN WITNESS WHEREOF, the parties hereby have executed this Rights
Agreement on the date first above written.

                                      "COMPANY"

                                      NEW FOCUS, INC., a
                                      California corporation

                                      By: ______________________________________
                                          Kenneth E. Westrick,
                                          President and Chief Executive Officer

                                      "SERIES A HOLDERS"

                                      MILTON CHANG

                                      __________________________________________
                                      (Signature)

                                      CHANG PARTNERS, A CALIFORNIA LIMITED
                                      Partnership

                                      By: ______________________________________

                                      Title: ___________________________________

                                      VENTURE LENDING AND LEASING II, INC.

                                      By: ______________________________________

                                      Title: ___________________________________

                                      -23-
<PAGE>   24
                                      "SERIES D HOLDERS"

                                      UT TECHNOLOGY PARTNERS, LDC

                                      By: ______________________________________

                                      Title: ___________________________________

                                      LIZABETH MOSES

                                      __________________________________________
                                      (Signature)

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   25
                                      ROBERT L. BYER AND EVA M. BYER
                                      TRUSTEES FBO BYER FAMILY TRUST
                                      UTD 9/18/83

                                      __________________________________________
                                      Robert L. Byer, Trustee

                                      DOUGLAS R. BYER TRUST
                                      UTD 12/28/88

                                      __________________________________________
                                      Robert L. Byer, Trustee

                                      C.E. UNTERBERG, TOWBIN
                                      CAPITAL PARTNERS I, L.P.

                                      By: ______________________________________
                                      Title:   Robert Matluck, Member of the GP

                                      HAMBRO-SPINNER RENAISSANCE FUND

                                      By: ______________________________________

                                      Title: ___________________________________

                                      JOHN A. DEXHEIMER

                                      __________________________________________
                                      (Signature)

                                      BRETT MAXWELL

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   26
                                      __________________________________________
                                      (Signature)

                                      MICHAEL GORDON

                                      __________________________________________
                                      (Signature)

                                      DAVID KING

                                      __________________________________________
                                      (Signature)

                                      LAMOREAUX PARTNERS

                                      By: ______________________________________

                                      Title: ___________________________________

                                      PHILLIP A. LAMOREAUX

                                      __________________________________________
                                      (Signature)

                                      DAVE OSBORNE

                                      __________________________________________
                                      (Signature)

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   27
                                      ROGER HEWITSON

                                      __________________________________________
                                      (Signature)

                                      KEVIN KALKHOVEN

                                      __________________________________________
                                      (Signature)

                                      TONY S. HSU AND LILY PAO HSU, TRUSTEES OF
                                      THE TONY AND LILY HSU FAMILY TRUST DATED
                                      11/8/89

                                      By: ______________________________________

                                      Title: ___________________________________

                                      ANDREW CHASE AND LAURA CHASE, TRUSTEES OF
                                      THE CHASE 1991 REVOCABLE TRUST DATED
                                      4/2/91

                                      By: ______________________________________

                                      Title: ___________________________________

                                      THOMAS B. DAY

                                      __________________________________________
                                      (Signature)

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   28
                                      JAY BERENTER

                                      __________________________________________
                                      (Signature)

                                      MARK DAY

                                      __________________________________________
                                      (Signature)

                                      PATRICK DAY

                                      __________________________________________
                                      (Signature)

                                      PAMELA YORK

                                      __________________________________________
                                      (Signature)

                                      ANTHONY RICHARD MULLER AND LARY LYNN H.
                                      MULLER, TRUSTEES OF THE ANTHONY RICHARD
                                      MULLER AND LARRY LYNN H. MULLER TRUSTS,
                                      U/D/T JULY 1, 1981

                                      By: ______________________________________

                                      Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   29
                                      C.E. UNTERBERG TOWBIN 401(k) PROFIT
                                      SHARING PLAN DTD 10/26/90 FBO ANDY ARNO

                                      By: ______________________________________

                                      Title: ___________________________________

                                      ANDREW ARNO ACF
                                      JESSE BENJAMIN ARNO U/NY/UGMA

                                      By: ______________________________________

                                      Title: ___________________________________

                                      ANDREW ARNO ACF
                                      MATTHEW ARNO U/NY/UGMA

                                      By: ______________________________________

                                      Title: ___________________________________

                                      GEORGE YULE

                                      __________________________________________
                                      (Signature)

                                      LINDEN PARTNERS LLC

                                      By: ______________________________________

                                      Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   30
                                      JEFFREY MOSKOWITZ

                                      __________________________________________
                                      (Signature)

                                      "SERIES E HOLDERS"

                                      MORGENTHALER VENTURES PARTNERS V, L.P.
                                      BY: MORGENTHALER MANAGEMENT PARTNERS V,
                                      LLP, ITS MANAGING PARTNER

                                      By: ______________________________________

                                      Title: ___________________________________

                                      U.S. VENTURE PARTNERS VI, L.P.
                                      AS NOMINEE FOR
                                      U.S. VENTURE PARTNERS VI, L.P.
                                      USVP VI AFFILIATES FUND, L.P.
                                      USVP VI ENTREPRENEUR PARTNERS, L.P.
                                      BY:  PRESIDIO MANAGEMENT GROUP VI, L.L.C.
                                           GENERAL PARTNER

                                      By: ______________________________________
                                          Michael P. Maher, Attorney in Fact

                                      KENNETH WESTRICK

                                      __________________________________________
                                      (Signature)

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   31
                                      SPINNER GLOBAL TECHNOLOGY FUND, LTD.

                                      By: ______________________________________

                                      Title: ___________________________________

                                      UT TECHNOLOGY PARTNERS, LDC

                                      By: ______________________________________

                                      Title: ___________________________________

                                      ROBERT L. BYER AND EVA M. BYER TRUSTEES
                                      FBO BYER FAMILY TRUST UTD 9/18/83

                                      By: ______________________________________

                                      Title: ___________________________________

                                      DOUGLAS R. BYER :TRUST

                                      By: ______________________________________

                                      Title: ___________________________________

                                      "SERIES F HOLDER"

                                      INTEL CORPORATION

                                      By: ______________________________________

                                      Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   32
                                      "SERIES G PURCHASERS"

                                      LONDON PACIFIC LIFE & ANNUITY COMPANY

                                      By: ______________________________________

                                      Title: ___________________________________

                                      MORGENTHALER VENTURES PARTNERS V, L.P.
                                      BY: MORGENTHALER MANAGEMENT PARTNERS V,
                                      LLP, ITS MANAGING PARTNER

                                      By: ______________________________________

                                      Title: ___________________________________

                                      U.S. VENTURE PARTNERS VI, L.P.
                                      USVP VI AFFILIATES FUND, L.P.
                                      USVP VI ENTREPRENEUR PARTNERS, L.P.
                                      2180 ASSOCIATES FUND VI, L.P.
                                      By:  Presidio Management Group VI, L.L.C.
                                      Its General Partner

                                      By: ______________________________________
                                          Michael P. Maher/Attorney-in-Fact

                                      INTEL CORPORATION

                                      By: ______________________________________

                                      Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   33
                                      UT TECHNOLOGY PARTNERS, LDC

                                      By: ______________________________________

                                      Title: ___________________________________

                                      LAMOREAUX PARTNERS

                                      By: ______________________________________

                                      Title: ___________________________________

                                      PHIL LAMOREAUX

                                      __________________________________________
                                      (Signature)

                                      CLARK HARRIS

                                      __________________________________________
                                      (Signature)

                                      NANCY CASEY

                                      __________________________________________
                                      (Signature)

                                      SCHEFFEL & ASSOCIATES LLC

                                      By: ______________________________________

                                      Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]
<PAGE>   34
                                     DAVID SPIEGEL

                                     __________________________________________
                                     (Signature)

                                     WPG RAYTHEON NETWORKING FUND, L.P.

                                     By: ______________________________________

                                     Title: ___________________________________

                                     RAJ MEHRA

                                     __________________________________________
                                     (Signature)

                                     S. ROBERT SMITH AND CAROL J. SMITH FAMILY
                                     TRUST DATED MAY 1, 1998

                                     By: ______________________________________

                                     Title: ___________________________________

                                     SELIGMANN INVESTMENT OPPORTUNITIES (MASTER)
                                     FUND-NTV PORTFOLIO
                                     SELIGMANN NEW TECHNOLOGIES FUND, INC.
                                     By:  J. & W. Seligmann & Co. Incorporated,
                                     Its investment advisor

                                     By: ______________________________________

                                     Title: ___________________________________

           [Fifth Amended and Restated Registration Rights Agreement]

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