Document:

DIGITAL LIGHTWAVE, INC.

                 THIRD AMENDED AND RESTATED SECURITY AGREEMENT

      This Third Amended and Restated Security Agreement (this "Agreement") is
made as of March 28, 2003, by and between Digital Lightwave, Inc., a Delaware
corporation (the "Debtor"), in favor of Optel, LLC (the "Secured Party").

                                   RECITALS

      The Debtor and the Secured Party are parties to (i) that certain Secured
Promissory Note dated as of February 14, 2003 in the original principal amount
of $800,000 upon the terms and subject to the conditions set forth therein, and
as the same may be increased, amended, modified or extended from time to time,
(ii) that certain Secured Promissory Note dated as of February 26, 2003 in the
original principal amount of $650,000 upon the terms and subject to the
conditions set forth therein, and as the same may be increased, amended,
modified or extended from time to time, and (iii) that certain Secured
Promissory Note dated as of the date hereof in the original principal amount of
$450,000 upon the terms and subject to the conditions set forth therein, and as
the same may be increased, amended, modified or extended from time to time
(collectively, the "Notes").  The parties intend that the Debtor's obligations
to repay the Notes be secured by all of the assets of the Debtor.

                                   AGREEMENT

      In consideration of the purchase of the Notes by the Secured Party and
for other good and valuable consideration, the receipt and adequacy of which
are hereby acknowledged, the Debtor hereby agrees with the Secured Party as
follows:

      1.  GRANT OF SECURITY INTEREST.

            (a)To secure the Debtor's full and timely performance of the
Obligations, the Debtor hereby grants to the Secured Party a continuing Lien on
and security interest (the "Security Interest") in, all of the Debtor's right,
title and interest in and to all of its personal property and assets (both
tangible and intangible), including, without limitation, the following, whether
now owned or hereafter acquired and wherever located: (a) all Receivables; (b)
all Equipment; (c) all Fixtures; (d) all General Intangibles; (e) all
Inventory; (f) all Investment Property; (g) all Deposit Accounts; (h) all Cash;
(i) all other Goods of the Debtor; (j) all Intellectual Property; and (l) all
Proceeds of each of the foregoing and all accessions to, and replacements for,
each of the foregoing (collectively, the "Collateral").  The Security Interest
shall be a first and prior interest in all of the Collateral, provided,
however, that the Security Interest shall be subordinated with respect to any
Collateral that is subject to the Prior Security Interests (as defined below).

            (b)The following terms shall have the following meanings for
purposes of thi            s Agreement:

            "ACCOUNT" means any "Account," as such term is defined in the UCC
now owned or hereafter acquired by the Debtor or in which the Debtor now holds
or hereafter acquires any interest and, in any event, shall include, without
limitation, all accounts receivable, book debts, rights to payment and other
forms of obligations (other than forms of obligations evidenced by Chattel
Paper, Documents or Instruments) now owned or hereafter received or acquired by
or belonging or owing to the Debtor whether or not arising out of goods or
software sold or services rendered by the Debtor or from any other transaction,
whether or not the same involves the sale of goods or services by the Debtor
and all of the Debtor's rights in, to and under all purchase orders or receipts
now owned or hereafter acquired by it for goods or services, and all of the
Debtor's rights to any goods represented by any of the foregoing, and all
monies due or to become due to the Debtor under all purchase orders and
contracts for the sale of goods or the performance of services or both by the
Debtor or in connection with any other transaction (whether or not yet earned
by performance on the part of the Debtor), now in existence or hereafter
occurring, including, without limitation, the right to receive the proceeds of
said purchase orders and contracts, and all collateral security and guarantees
of any kind given by any Person with respect to any of the foregoing.

            "CASH" means all cash, money, currency, and liquid funds, wherever
held, in which the Debtor now or hereafter acquires any right, title, or
interest.

            "CHATTEL PAPER" means any "Chattel paper," as such term is defined
in the UCC, now owned or hereafter acquired by the Debtor or in which the
Debtor now holds or hereafter acquires any interest.

            "COMMERCIAL TORT CLAIM" shall have the meaning given to that term
in Section 2(e) of this Agreement.

            "CREDIT DOCUMENTS" means this Agreement, the Notes and any UCC-1
Financing Statement filed herewith.

            "DEPOSIT ACCOUNTS" means any "Deposit accounts," as such term is
defined in the UCC, and includes any checking account, savings account, or
certificate of deposit, now owned or hereafter acquired by the Debtor or in
which the Debtor now holds or hereafter acquires any interest.

            "DOCUMENTS" means any "Documents," as such term is defined in the
UCC, now owned or hereafter acquired by the Debtor or in which the Debtor now
holds or hereafter acquires any interest.

            "ELECTRONIC CHATTEL PAPER" means any "Electronic chattel paper," as
such term is defined in the UCC, now owned or hereafter acquired by the Debtor
or in which the Debtor now holds or hereafter acquires any interest.

            "EQUIPMENT" means any "Equipment," as such term is defined in the
UCC, now owned or hereafter acquired by the Debtor or in which the Debtor now
holds or hereafter acquires any interest and any and all additions, upgrades,
substitutions and replacements of any of the foregoing, together with all
attachments, components, parts, equipment and accessories installed thereon or
affixed thereto, now owned or hereafter acquired by the Debtor or in which the
Debtor now holds or hereafter acquires interest.

            "FIXTURES" means any "Fixtures," as such term is defined in the
UCC, together with all right, title and interest of the Debtor in and to all
extensions, improvements, betterments, accessions, renewals, substitutes, and
replacements of, and all additions and appurtenances to any of the foregoing
property, and all conversions of the security constituted thereby, immediately
upon any acquisition or release thereof or any such conversion, as the case may
be, now owned or hereafter acquired by the Debtor or in which the Debtor now
holds or hereafter acquires any interest.

            "GENERAL INTANGIBLE" means any "General intangible," as such term
is defined in the UCC, now owned or hereafter acquired by the Debtor or in
which the Debtor now holds or hereafter acquires any interest and, in any
event, shall include, without limitation, all right, title and interest that
the Debtor may now or hereafter have in or under any contracts, rights to
payment, payment intangibles, confidential information, interests in
partnerships, limited liability companies, corporations, joint ventures and
other business associations, permits, goodwill, claims in or under insurance
policies, including unearned premiums and premium adjustments, uncertificated
securities, deposit, checking and other bank accounts, but shall not include
any Intellectual Property (including the right to receive all proceeds and
damages therefrom), rights to receive tax refunds and other payments and rights
of indemnification.

            "GOODS" means any "Goods," as such term is defined in the UCC, now
owned or hereafter acquired by the Debtor or in which the Debtor now holds or
hereafter acquires any interest.

            "INSTRUMENTS" means any "Instrument," as such term is defined in
the UCC, now owned or hereafter acquired by the Debtor or in which the Debtor
now holds or hereafter acquires any interest.

            "INTELLECTUAL PROPERTY" means, collectively, all rights, priorities
and privileges of the Debtor relating to intellectual property, whether arising
under United States, multinational or foreign laws or otherwise, including
copyrights, copyright licenses, inventions, patents, patent licenses,
trademarks, trademark licenses and trade secrets (including customer lists),
domain names, Web sites and know-how, including, but not limited to, the
patents, trademarks and copyrights set forth on Schedule  2 .

            "INVENTORY" means any "Inventory," as such term is defined in the
UCC, now owned or hereafter acquired by the Debtor or in which the Debtor now
holds or hereafter acquires any interest, and, in any event, shall include,
without limitation, all inventory, goods and other personal property that are
held by or on behalf of the Debtor for sale or lease or are furnished or are to
be furnished under a contract of service or that constitute raw materials, work
in process or materials used or consumed or to be used or consumed in the
Debtor's business, or the processing, packaging, promotion, delivery or
shipping of the same, and all finished goods, whether or not the same is in
transit or in the constructive, actual or exclusive possession of the Debtor or
is held by others for the Debtor's account, including, without limitation, all
goods covered by purchase orders and contracts with suppliers and all goods
billed and held by suppliers and all such property that may be in the
possession or custody of any carriers, forwarding agents, truckers,
warehousemen, vendors, selling agents or other Persons.

            "INVESTMENT PROPERTY" means any "Investment property," as such term
is defined in the UCC, and includes certificated securities, uncertificated
securities, money market funds and U.S. Treasury bills or notes, now owned or
hereafter acquired by the Debtor or in which the Debtor now holds or hereafter
acquires any interest.

            "LETTER OF CREDIT RIGHT" means any "Letter of credit right," as
such term is defined in the UCC, now owned or hereafter acquired by the Debtor
or in which the Debtor now holds or hereafter acquires any interest, including
any right to payment or performance under any letter of credit.

            "LIEN" means any mortgage, deed of trust, pledge, hypothecation,
assignment for security, security interest, encumbrance, levy, lien or charge
of any kind, whether voluntarily incurred or arising by operation of law or
otherwise, against any property, any conditional sale or other title retention
agreement, any lease in the nature of a security interest, and the filing of
any financing statement (other than a precautionary financing statement with
respect to a lease that is not in the nature of a security interest) under the
UCC or comparable law of any jurisdiction.

            "OBLIGATIONS" shall mean and include all loans, advances, debts,
liabilities and obligations, however arising, owed by the Debtor to the Secured
Party of every kind and description (whether or not evidenced by any note or
instrument and whether or not for the payment of money), direct or indirect,
absolute or contingent, due or to become due, now existing or hereafter arising
pursuant to the terms of the Notes, or any of the other Credit Documents or
otherwise, including without limitation all interest, fees, charges, expenses,
attorneys' fees and accountants' fees chargeable to the Debtor or payable by
the Debtor thereunder.

            "PERMITTED LIENS" shall mean (a) Liens for taxes or other
governmental charges not at the time delinquent or thereafter payable without
penalty or being contested in good faith, provided that adequate reserves for
the payment thereof have been established in accordance with generally accepted
accounting principals, (b) Liens of carriers, warehousemen, mechanics,
materialmen, vendors, and landlords and other similar Liens imposed by law
incurred in the ordinary course of business for sums not overdue more than 45
days or being contested in good faith, provided that adequate reserves for the
payment thereof have been established in accordance with generally accepted
accounting principals, (c) deposits under workers' compensation, unemployment
insurance and social security laws or to secure the performance of bids,
tenders, contracts (other than for the repayment of borrowed money) or leases,
or to secure statutory obligations of surety or appeal bonds or to secure
indemnity, performance or other similar bonds in the ordinary course of
business, (d) zoning restrictions, easements, rights-of-way, title
irregularities and other similar encumbrances, which alone or in the aggregate
are not substantial in amount and do not materially detract from the value of
the property subject thereto or interfere with the ordinary conduct of the
business of the Debtor, (e) banker's Liens and similar Liens (including set-off
rights) in respect of bank deposits, (f)  Liens in favor of customs and revenue
authorities arising as a matter of law to secure payment of customs duties and
in connection with the importation of goods in the ordinary course of the
Debtor's business, (g) Liens on the property or assets of any subsidiary of the
Debtor in favor of the Debtor, (h) purchase money Liens that will be discharged
upon the Debtor's payment of the purchase price for the applicable property, to
the extent such Liens relate solely to the property so purchased and (j) the
security interests set forth on Schedule 1 (the "Prior Security Interests");
provided, however, that except for the Prior Security Interests, that in each
case, such Lien is not senior or prior to the Security Interest created
hereunder.

            "PERSON" means any individual, sole proprietorship, partnership,
joint venture, trust, unincorporated organization, association, corporation,
limited liability company, institution, public benefit corporation, other
entity or government (whether federal, state, county, city, municipal, local,
foreign, or otherwise, including any instrumentality, division, agency, body or
department thereof).

            "PROCEEDS" means "Proceeds," as such term is defined in the UCC
and, in any event, shall include, without limitation, (a) any and all Accounts,
Chattel Paper, Instruments, cash or other forms of money or currency or other
proceeds payable to the Debtor from time to time in respect of the Collateral,
(b) any and all proceeds of any insurance, indemnity, warranty or guaranty
payable to the Debtor from time to time with respect to any of the Collateral,
(c) any and all payments (in any form whatsoever) made or due and payable to
the Debtor from time to time in connection with any requisition, confiscation,
condemnation, seizure or forfeiture of all or any part of the Collateral by any
governmental authority (or any Person acting under color of governmental
authority), (d) the proceeds, damages, or recovery based on any claim of the
Debtor against third parties (i) for past, present or future infringement of
any copyright, patent or patent license or (ii) for past, present or future
infringement or dilution of any trademark or trademark license or for injury to
the goodwill associated with any trademark, trademark registration or trademark
licensed under any trademark license and (e) any and all other amounts from
time to time paid or payable under or in connection with any of the Collateral.

            "RECEIVABLES" means all of the Debtor's Accounts, Instruments,
Documents, Chattel Paper, Supporting Obligations, and letters of credit and
Letter of Credit Rights.

            "SUPPORTING OBLIGATION" means any "Supporting obligation," as such
term is defined in the UCC, now owned or hereafter acquired by the Debtor or in
which the Debtor now holds or hereafter acquires any interest.

            "UCC" means the Uniform Commercial Code as the same may, from time
to time, be in effect in the State of Florida; provided, that in the event
that, by reason of mandatory provisions of law, any or all of the attachment,
perfection or priority of, or remedies with respect to, Secured Party's Lien on
any Collateral is governed by the Uniform Commercial Code as enacted and in
effect in a jurisdiction other than the State of Florida, the term "UCC" shall
mean the Uniform Commercial Code as enacted and in effect, from time to time,
in such other jurisdiction solely for purposes of the provisions thereof
relating to such attachment, perfection, priority or remedies and for purposes
of definitions related to such provisions.

            Unless otherwise defined herein, all capitalized terms used herein
and defined in the Notes shall have the respective meaning given to those terms
in the Notes, and terms that are defined in the UCC and used herein shall have
the meanings given to them in the UCC.

      2.REPRESENTATIONS AND WARRANTIES.  The Debtor hereby represents and
warrants     to the Secured Party that:

            (a)OWNERSHIP OF COLLATERAL.  The Debtor is the legal and beneficial
owner of the Collateral (or, in the case of after-acquired Collateral, at the
time the Debtor acquires rights in the Collateral, will be the legal and
beneficial owner thereof).  Except for the Security Interest granted to the
Secured Party pursuant to this Agreement, the Debtor has rights in or the power
to transfer the Collateral free and clear of any adverse Lien, security
interest or encumbrance except as created by this Security Interest, except for
Permitted Liens.  Except for the financing statements listed in Schedule 3, no
financing statements covering any Collateral or any proceeds thereof are on
file in any public office (other than filings listing the Secured Party as the
secured party).

            (b)VALID SECURITY INTEREST.  The Security Interest granted pursuant
to this Agreement will constitute a valid and continuing first priority,
perfected security interest in favor of the Secured Party in the Collateral for
which perfection is governed by the UCC or filing with the United States
Copyright Office or United States Patent and Trademark Office.  Such Security
Interest will be prior to all other Liens on the Collateral, except for
Permitted Liens                       .

            (c)ORGANIZATION AND GOOD STANDING.  The Debtor has been duly
incorporated, and is validly existing and in good standing, under the laws of
the State of De                 laware.

            (d)LOCATION, STATE OF ORGANIZATION AND NAME OF THE DEBTOR.  The
Debtor's state of organization is Delaware and the Debtor's exact legal name as
it appears in the official filings in the State of Delaware is as set forth in
the first paragraph of this Agreement.  The Debtor has only one jurisdiction of
organization.

            (e)LOCATION OF EQUIPMENT AND INVENTORY.  All Equipment and
Inventory are (i) located at the locations indicated on Schedule 4 (ii) in
transit to such locations or (iii) in transit to a third party purchaser which
will become obligated on a Receivable to the Debtor upon receipt.  Except for
Equipment and Inventory referred to in clauses (ii) and (iii) of the preceding
sentence, the Debtor has exclusive possession and control of the Inventory and
Equipment.

            (g)DELIVERY OF ITEMS.  Schedule 5 lists all Instruments (other than
checks received in the ordinary course of business), letter-of-credit rights,
Electronic Chattel paper and Chattel Paper of the Debtor as of the date hereof.
The Debtor has delivered to the Secured Party, together with all necessary
stock powers, endorsements, assignments and other necessary instruments of
transfer, the originals of all Receivables consisting of instruments and
Chattel Paper and the originals of all certificated securities owned directly
by the Debtor.

            (h)RECEIVABLES.  Each Receivable is genuine and enforceable against
the party obligated to pay the same (an "Account Debtor") free from any right
of rescission, defense, setoff or discount.

            (i)INSURANCE.  Each insurance policy maintained by the Debtor is
validly existing and is in full force and effect.  The Debtor is not in default
in any material respect under the provisions of any insurance policy, and there
are no facts which, with the giving of notice or passage of time (or both),
would result in such a default under any material provision of any such
insurance policy.  Set forth in Schedule 6 is a complete and accurate list of
the insurance of the Debtor in effect on the date of this Agreement covering
fire, public liability, property damage and worker's compensation, showing as
of such date, (i) the type of insurance carried, (ii) the name of the insurance
carrier, and (iii) the amount of each type of insurance carried.

            (j)This Agreement is effective to create a valid and continuing
Lien upon the Collateral.  All action by the Debtor necessary to protect and
perfect such Lien on each item of the Collateral has been duly taken.

      3.COVENANTS.  The Debtor covenants and agrees with the Secured Party
that, from and after the date of this Agreement until the Obligations are paid
in full:

            (a)OTHER LIENS.  Except for the Security Interest and Permitted
Liens, the Debtor has rights in or the power to transfer the Collateral and its
title and will be able to do so hereafter free from any adverse Lien, security
interest or encumbrance, and the Debtor will defend the Collateral against the
claims and demands of all persons at any time claiming the same or any interest
therein.

            (b)FURTHER DOCUMENTATION.  At any time and from time to time, upon
the written request of the Secured Party, and at the sole expense of the
Debtor, the Debtor will promptly and duly authenticate and deliver such further
instruments and documents and take such further action as the Secured Party may
reasonably request for the purpose of obtaining or preserving the full benefits
of this Agreement and of the rights and powers herein granted including,
without limitation, filing any financing or continuation statements under the
UCC in effect with respect to the Liens created hereby.  The Debtor also hereby
authorizes the Secured Party to file any such financing, amendment or
continuation statement without the authentication of the Debtor to the extent
permitted by applicable law.  A reproduction of this Agreement shall be
sufficient as a financing statement (or as an exhibit to a financing statement
on form UCC-1) for filing in any jurisdiction.

            (c)INDEMNIFICATION.  The Debtor agrees to defend, indemnify and
hold harmless the Secured Party against any and all liabilities, costs and
expenses (including, without limitation, legal fees and expenses)
("Liabilities"): (i) with respect to, or resulting from, any delay in paying,
any and all excise, sales or other taxes which may be payable or determined to
be payable with respect to any of the Collateral, (ii) with respect to, or
resulting from, any delay in complying with any law, rule, regulation or order
of any governmental authority applicable to any of the Collateral or (iii) in
connection with any of the transactions contemplated by this Agreement.

            (d)MAINTENANCE OF RECORDS.  The Debtor will keep and maintain at
its own expense complete and satisfactory, in all material respects, records of
the Collateral.

            (e)INSPECTION RIGHTS.  The Secured Party shall have full access
during normal business hours, and upon prior notice, to all the books, corre-
spondence and other records of the Debtor relating to the Collateral.  The
Secured Party or its representatives may examine such records and make
photocopies or otherwise take extracts from such records.  The Debtor agrees to
render to the Secured Party, at the Debtor's expense, such clerical and other
assistance as the Secured Party may request with regard to the exercise of its
rights pursuant      to this paragraph.

            (f)COMPLIANCE WITH LAWS, ETC.  The Debtor (i) will comply with all
laws, rules, regulations and orders of any governmental authority applicable to
any part of the Collateral or to the operation of the Debtor's business, the
failure of which to comply with will have a material adverse effect on the
Debtor, and (ii) shall not use or permit any Collateral to be used in violation
of any provision of any Credit Document, any law, rule or obligation or order
of any governmental authority, or any policy of insurance covering the
Collateral; PROVIDED, HOWEVER, that in each case, the Debtor may contest any
such law, rule, regulation or order; in any reasonable manner which does not,
in the reasonable opinion of the Secured Party, adversely affect the Secured
Party's rights or the priority of its Liens on the Collateral.

            (g)PAYMENT OF OBLIGATIONS.  The Debtor will pay promptly when due
all taxes, assessments and governmental charges or levies imposed upon the
Collateral or with respect to any its income or profits derived from the
Collateral, as well as all claims of any kind (including, without limitation,
claims for labor, materials and supplies) against or with respect to the
Collateral.

            (h)LIMITATION ON LIENS ON COLLATERAL.  The Debtor will not create,
incur or permit to exist, will defend the Collateral against, and will take
such other action as is necessary to remove, any Lien or claim on or to the
Collateral, other than the Security Interest and Permitted Liens, and will
defend the right, title and interest of the Secured Party in and to any of the
Collateral against the claims and demands of all other persons.

            (i)LIMITATIONS ON DISPOSITIONS OF COLLATERAL.  The Debtor will not
sell, transfer, lease, or otherwise dispose of any of the Collateral, or
attempt, offer or contract to do so other than dispositions of Inventory in the
ordinary course of the Debtor's business; PROVIDED, HOWEVER that the Debtor
will be allowed to grant licenses to its products and related documentation in
the ordinary course of business and to establish or provide for escrows of
related intellectual property in connection therewith.

            (j)FURTHER IDENTIFICATION OF COLLATERAL.  The Debtor will furnish
to the Secured Party from time to time statements and schedules further
identifying and describing the Collateral and such other reports in connection
with the Collateral as the Secured Party may request, all in detail acceptable
to the Secured                   Party.

            (k)NOTICE OF CHANGE OF STATE OF INCORPORATION.  Without 30 days'
prior written notice to the Debtor shall not (i) change the Debtor's name,
state of incorporation or organization, organizational identification number or
place of business (or, if the Debtor has more than one place of business, its
chief executive office), or the office in which the Debtor's records relating
to Receivables are kept, or (ii) keep Collateral consisting of Chattel Paper
and documents at any location other than its chief executive office.

            (l)FUTURE COMMERCIAL TORT CLAIMS.  The Debtor will promptly give
notice to the Secured Party upon the initiation of any Commercial Tort Claim.
The Debtor hereby authorizes the Secured Party to amend this Agreement (without
any further action or consent from the Debtor) to include any such Commercial
Tort Claim as C    ollateral hereunder.

            (m)DEPOSIT ACCOUNTS.  For each deposit account maintained by the
Debtor, the Debtor shall, along with the bank or other depository institution
at which such deposit account is maintained (the "Depositary Bank"), execute
and deliver to the Secured Party a Deposit Account Control Agreement in form
and substance reasonably satisfactory to the Secured Party.  If requested by
the Secured Party, the Debtor shall also obtain a blocked account, lockbox or
similar agreement with all or certain Depository Banks.  Without ten days prior
written notice to the Secured Party, the Debtor shall not establish any deposit
account not set    forth on Schedule 6.

            (n)COLLECTION OF RECEIVABLES.  The Debtor shall collect, enforce
and receive delivery of the Receivables in accordance with past practice.

            (q)INSURANCE. The Debtor shall (i) maintain and keep in force
insurance of the types and in amounts customarily carried from time to time
during the term of this Agreement in its lines of business, including fire,
public liability, property damage and worker's compensation, such insurance to
be carried with companies and in amounts satisfactory to the Secured Party,
(ii) deliver to the Secured Party from time to time, as the Secured Party may
request, schedules setting forth all insurance then in effect, and
(iii) deliver to the Secured Party copies of each policy of insurance which
replaces, or evidences the renewal of, each existing policy of insurance at
least 15 days prior to the expiration of such policy.  The Secured Party shall
be named as additional insured or additional loss payee, as appropriate, on all
liability and property insurance of the Debtor and such policies shall contain
such additional endorsements as shall be required by the Secured Party.

            (r)MORTGAGEE WAIVERS.  The Debtor shall use its best efforts to
obtain waivers or subordinations of Liens from landlords and mortgagees, and
the Debtor shall, in all instances, obtain signed acknowledgements of the
Secured Party's Liens from bailees having possession of any of the Debtor's
Collateral that they hold such Collateral for the benefit of the Secured Party
pursuant to Section 9313(c) of the UCC.

            (s)LETTERS OF CREDIT.  If the Debtor is or becomes the beneficiary
of a letter of credit, the Debtor shall promptly, and in any event within two
business days after becoming a beneficiary, notify the Secured Party thereof
and enter into a tri-party agreement with the Secured Party and the issuer or
confirmation bank with respect to such Letter of Credit Rights assigning such
Letter of Credit Rights to the Secured Party and directing all payments
thereunder to the Secured Party, all in form and substance satisfactory to the
Secured Party.

            (t)ELECTRONIC CHATTEL PAPER.  The Debtor shall take all steps
reasonably necessary to grant the Secured Party control of all Electronic
Chattel Paper in accordance with the UCC and all "transferable records" as
defined in each of the Uniform Electronic Transactions Act and the Electronic
Signatures in Global and National Commerce Act.

            (u)INTELLECTUAL PROPERTY MATTERS.  The Debtor shall notify the
Secured Party immediately if it knows or has reason to know (i) that any
application or registration relating to any of its Intellectual Property that
is material to the operation of its business may become abandoned or dedicated,
or (ii) of any adverse determination or development (including the institution
of, or any such determination or development in, any proceeding in the United
States Patent and Trademark Office, the United States Copyright Office or any
court) regarding the Debtor's ownership of any Intellectual Property that is
material to the operation of its business, its right to register the same, or
to keep and mai         ntain the same.

            (v)INTELLECTUAL PROPERTY APPLICATIONS.  In no event shall the
Debtor, either itself or through any agent, employee, licensee or designee,
file an application for the registration of any patent, trademark or copyright
with the United States Patent and Trademark Office, the United States Copyright
Office or any similar office or agency without giving the Secured Party prior
written notice thereof, and, upon request of the Secured Party, the Debtor
shall execute and deliver any and all security documents as the Secured Party
may request to evidence the Secured Party's Lien on such Intellectual Property
and the general intangibles of the Debtor relating thereto or represented
thereby.  The Debtor hereby authorizes the Secured Party to amend this
Agreement (without any further action or consent from the Debtor) to include
any such patent, trademark or copyright as Collateral hereunder.

            (w)INTELLECTUAL PROPERTY ABANDONMENT.  The Debtor shall take all
actions reasonably necessary or requested by the Secured Party to maintain and
pursue each application, to obtain the relevant registration and to maintain
the registration of its Intellectual Property, including the filing of
applications for renewal, affidavits of use, affidavits of noncontestability
and opposition and interference and cancellation proceedings.

            (x)PROTECTION OF INTELLECTUAL PROPERTY.  In the event that any of
the Debtor's Intellectual Property is infringed upon, or misappropriated or
diluted by a third party, the Debtor shall notify the Secured Party promptly
after the Debtor learns thereof.  The Debtor shall, unless the Secured Party
shall determine that such Intellectual Property is in no way material to the
conduct of its business or operations, promptly sue for, and seek recovery of
any and all damages resulting from such infringement, misappropriation or
dilution, and shall take such other actions as the Secured Party shall deem
necessary under the circumstances to protect such Intellectual Property.

            (y)CHATTEL PAPER.  The Debtor shall type, print or stamp
conspicuously on the face of all original copies of all Collateral consisting
of Chattel Paper and Documents not in the possession of the Secured Party
having a value in excess of $100,000 a legend satisfactory to the Secured Party
indicating that such Chattel Paper is subject to the security interest granted
hereby.

            (z)LIMITATION ON FILING OF FINANCING STATEMENTS.  The Debtor
acknowledges that it is not authorized to file any financing statement or
amendment or termination statement with respect to any financing statement
without the prior written consent of the Secured Party and agrees that it will
not do so without the prior written consent of the Secured Party, subject to
the Debtor's rights under Section 9509(d)(2) of the UCC.

      4.EVENT OF DEFAULT; THE SECURED PARTY'S APPOINTMENT AS ATTORNEY-IN-FACT.

            (a)EVENT OF DEFAULT.  For purposes of this Agreement, the
occurrence of any one of the following events (each, an "Event of Default")
shall constitute a default hereunder and under the Notes or any of the other
Credit Document                      s:

                  (i)The Debtor's failure to pay or discharge the Obligations
in full in accordance with the terms of the Notes or any of the other Credit
Documents;

                  (ii)A breach of any representation or warranty made by the
Debtor under the this Agreement, the Notes or any of the other Credit Documents
as of the date thereof or any other document or instrument entered into between
the Debtor and the Secured Party in connection herewith.

                  (iii)The Debtor's failure to observe or perform any other
covenant, obligation, condition or agreement contained in this Agreement, the
Notes or any of the other Credit Documents and such failure shall continue for
10 days after the earlier of (i) the Debtor's written acknowledgement of such
failure and (ii) written notice by the Secured Party to the Debtor of such
failure.

                  (iv)The insolvency of the Debtor, the commission of any act
of bankruptcy by the Debtor, the execution by the Debtor of a general
assignment for the benefit of creditors, the filing by or against the Debtor of
a petition in bankruptcy or any petition for relief under the federal
bankruptcy act or the continuation of such petition without dismissal for a
period of 90 days or more, or the appointment of a receiver or trustee to take
possession of the property or assets of the Debtor.

                  (v)A default shall occur under the Notes or any of the other
Credit Documents, or any other agreement entered into between the Debtor and
the Secured Party in connection herewith.

            (b)POWERS.  The Debtor hereby appoints the Secured Party and any
officer or agent of the Secured Party, with full power of substitution, as its
attorney-in-fact with full irrevocable power and authority in the place of the
Debtor and in the name of the Debtor or its own name, from time to time in the
Secured Party's discretion so long as an Event of Default has occurred and is
continuing, for the purpose of carrying out the terms of this Agreement, to
take any appropriate action and to authenticate any instrument which may be
necessary or desirable to accomplish the purposes of this Agreement.  Without
limiting the foregoing, so long as an Event of Default has occurred and is
continuing, the Secured Party shall have the right, without notice to, or the
consent of, the Debtor, to do any of the following on the Debtor's behalf:

                  (i)to pay or discharge any taxes or Liens levied or placed on
or threatened against   the Collateral;

                  (ii)to direct any party liable for any payment under any of
the Collateral to make payment of any and all amounts due or to become due
thereunder directly to the Secured Party or as the Secured Party directs;

                  (iii)to ask for or demand, collect, and receive payment of
and receipt for, any payments due or to become due at any time in respect of or
arising out of any Coll         ateral;

                  (iv)to commence and prosecute any suits, actions or
proceedings at law or in equity in any court of competent jurisdiction to
enforce any right in respect of any Collateral;

                  (v)to defend any suit, action or proceeding brought against
the Debtor with respect to any Collateral;

                  (vi)to settle, compromise or adjust any suit, action or
proceeding described in subsection (v) above and to give such discharges or
releases in connection therewith as the Secured Party may deem appropriate;

                  (vii)to assign any patent right included in the Collateral of
the Debtor (along with the goodwill of the business to which any such patent
right pertains), throughout the world for such term or terms, on such
conditions, and in such manner, as the Secured Party shall in its sole
discretion determine; a              nd

                  (viii)generally, to sell, transfer, pledge and make any
agreement with respect to or otherwise deal with any of the Collateral and to
take, at the Secured Party's option and the Debtor's expense, any actions which
the Secured Party deems necessary to protect, preserve or realize upon the
Collateral and the Secured Party's Liens on the Collateral and to carry out the
intent of this Agreement, in each case to the same extent as if the Secured
Party were the absolute owner of the Collateral for all purposes.

            The Debtor hereby ratifies whatever actions the Secured Party shall
lawfully do or cause to be done in accordance with this Section 4.  This power
of attorney shall be a power coupled with an interest and shall be irrevocable.

            (c)NO DUTY ON THE SECURED PARTY'S PART.  The powers conferred on
the Secured Party by this Section 4 are solely to protect the Secured Party's
interests in the Collateral and shall not impose any duty upon it to exercise
any such powers.  The Secured Party shall be accountable only for amounts that
it actually receives as a result of the exercise of such powers, and neither
the Secured Party nor any of its officers, directors, employees or agents
shall, in the absence of willful misconduct or gross negligence, be responsible
to the Debtor for any act or failure to act pursuant to this Section 4.

      5.PERFORMANCE BY THE SECURED PARTY OF THE DEBTOR'S OBLIGATIONS.  If the
Debtor fails to perform or comply with any of its agreements or covenants
contained in this Agreement and the Secured Party performs or complies, or
otherwise causes performance or compliance, with such agreement or covenant in
accordance with the terms of this Agreement, then the expenses of the Secured
Party incurred in connection with such performance or compliance shall be
payable by the Debtor to the Secured Party on demand and shall constitute
Obligati ons secured by this Agreement.

      6.REMEDIES.  If an Event of Default has occurred and is continuing, the
Secured Party may exercise, in addition to all other rights and remedies
granted to it in this Agreement and in any other instrument or agreement
relating to the Obligations, all rights and remedies of a secured party under
the UCC.  Without limiting the foregoing, the Secured Party, without demand of
performance or other demand, presentment, protest, advertisement or notice of
any kind (except any notice required by law) to or upon the Debtor or any other
person (all of which demands, defenses, advertisements and notices are hereby
waived), may in such circumstances collect, receive, appropriate and realize
upon any or all of the Collateral, and/or may sell, lease, assign, give an
option or options to purchase, or otherwise dispose of and deliver any or all
of the Collateral (or contract to do any of the foregoing), in one or more
parcels at a public or private sale or sales, at any exchange, broker's board
or office of the Secured Party or elsewhere upon such terms and conditions as
the Secured Party may deem advisable, for cash or on credit or for future
delivery without assumption of any credit risk.  The Secured Party shall have
the right upon any such public sale or sales and, to the extent permitted by
law, upon any such private sale or sales, to purchase all or any part of the
Collateral so sold, free of any right or equity of redemption in the Debtor,
which right or equity is hereby waived or released.  The Secured Party shall
apply the net proceeds of any such collection, recovery, receipt,
appropriation, realization or sale, after deducting all reasonable expenses
incurred therein or in connection with the care or safekeeping of any of the
Collateral or in any way relating to the Collateral or the rights of the
Secured Party under this Agreement (including, without limitation, reasonable
attorneys' fees and expenses) to the payment in whole or in part of the
Obligations, in such order as the Secured Party may elect, and only after such
application and after the payment by the Secured Party of any other amount
required by any provision of law, need the Secured Party account for the
surplus, if any, to the Debtor.  To the extent permitted by applicable law, the
Debtor waives all claims, damages and demands it may acquire against the
Secured Party arising out of the exercise by the Secured Party of any of its
rights hereunder.  If any notice of a proposed sale or other disposition of
Collateral shall be required by law, such notice shall be deemed reasonable and
proper if given at least ten days before such sale or other disposition.  The
Debtor shall remain liable for any deficiency if the proceeds of any sale or
other disposition of the Collateral are insufficient to pay the Obligations and
the fees and disbursements of any attorneys employed by the Secured Party to
collect               such deficiency.

      7.LIMITATION ON DUTIES REGARDING PRESERVATION OF COLLATERAL.  The Secured
Party's sole duty with respect to the custody, safekeeping and preservation of
the Collateral, under Section 9207 of the UCC or otherwise, shall be to deal
with it in the same manner as the Secured Party deals with similar property for
its own account.  Neither the Secured Party nor any of its directors, officers,
employees or agents shall be liable for failure to demand, collect or realize
upon all or any part of the Collateral or for any delay in doing so or shall be
under any obligation to sell or otherwise dispose of any Collateral upon the
request     of the Debtor or otherwise.

      8.POWERS COUPLED WITH AN INTEREST.  All authorizations and agencies
contained in this Agreement with respect to the Collateral are irrevocable and
are powe   rs coupled with an interest.

      9.NO WAIVER; CUMULATIVE REMEDIES.  The Secured Party shall not by any act
(except by a written instrument pursuant to Section 11(a) hereof), delay,
indulgence, omission or otherwise be deemed to have waived any right or remedy
hereunder or to have acquiesced in any default under the Notes or any of the
other Credit Documents or in any breach of any of the terms and conditions of
this Agreement.  No failure to exercise, nor any delay in exercising, on the
part of the Secured Party, any right, power or privilege hereunder shall
operate as a waiver thereof.  No single or partial exercise of any right, power
or privilege hereunder shall preclude any other or further exercise thereof or
the exercise of any other right, power or privilege.  A waiver by the Secured
Party of any right or remedy under this Agreement on any one occasion shall not
be construed as a bar to any right or remedy which the Secured Party would
otherwise have on any subsequent occasion.  The rights and remedies provided in
this Agreement are cumulative, may be exercised singly or concurrently and are
not exclusive of any rights or remedies provided by law.

      10.TERMINATION OF SECURITY INTEREST.  Upon satisfaction of the Debtor's
obligations pursuant to the Notes, the security interest granted herein shall
terminate and all rights to the Collateral shall revert to the Debtor.  Upon
any such termination, the Secured Party shall authenticate and deliver to the
Debtor such documents as the Debtor may reasonably request to evidence such
terminati                           on.

      11.                MISCELLANEOUS.

            (a)AMENDMENTS AND WAIVERS.  Any term of this Agreement may be
amended with the written consent of the parties or their respective successors
and assigns.  Any amendment or waiver effected in accordance with this
Section 11(a) shall be binding upon the parties and their respective successors
and assigns.

            (b)TRANSFER; SUCCESSORS AND ASSIGNS.  The terms and conditions of
this Agreement shall be binding upon the Debtor and its successors and assigns,
as well as all persons who become bound as a debtor to this Agreement and inure
to the benefit of the Secured Party and its successors and assigns.  Nothing in
this Agreement, express or implied, is intended to confer upon any party other
than the parties hereto or their respective successors and assigns any rights,
remedies, obligations or liabilities under or by reason of this Agreement,
except as expressly provided in this Agreement.

            (c)GOVERNING LAW.  This Agreement and all acts and transactions
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

            (d)COUNTERPARTS.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

            (e)TITLES AND SUBTITLES.  The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

            (f)NOTICES.  Any notice required or permitted by this Agreement
shall be in writing and shall be deemed sufficient upon receipt, when delivered
personally or by courier, overnight delivery service or confirmed facsimile, or
48 hours after being deposited in the U.S. mail as certified or registered mail
with postage prepaid, if such notice is addressed to the party to be notified
at such party's address or facsimile number as set forth below or as
subsequently modified by written notice.

            (h)PAYMENTS FREE OF TAXES, ETC.  All payments made by the Debtor
under this Agreement shall be made by the Debtor free and clear of and without
deduction for any and all present and future taxes, levies, charges, deductions
and withholdings.  In addition, the Debtor shall pay upon demand any stamp or
other taxes, levies or charges of any jurisdiction with respect to the
execution, delivery, registration, performance and enforcement of this
Agreement.  Upon request by the Secured Party, the Debtor shall furnish
evidence satisfactory to the Secured Party that all requisite authorizations
and approvals by, and notices to and filings with, governmental authorities and
regulatory bodies have been obtained and made and that all requisite taxes,
levies and char     ges have been paid.

            (i)SEVERABILITY.  If one or more provisions of this Agreement are
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith, in order to maintain the economic position
enjoyed by each party as close as possible to that under the provision rendered
unenforceable.  In the event that the parties cannot reach a mutually agreeable
and enforceable replacement for such provision, then (i) such provision shall
be excluded from this Agreement, (ii) the balance of the Agreement shall be
interpreted as if such provision were so excluded and (iii) the balance of the
Agreement shall be enforceable in accordance with its terms.

            (j)ENTIRE AGREEMENT.  This Agreement, and the documents referred to
herein constitute the entire agreement between the parties hereto pertaining to
the subject matter hereof, and any and all other written or oral agreements
existing between the parties hereto concerning such subject matter are
expressly cance                    led.

            (k)AMENDMENT AND RESTATEMENT.  Effective upon execution of this
Agreement by both parties, the Amended and Restated Security Agreement dated as
of February 26, 2003 between the Debtor and the Secured Party is hereby amended
and restated in its entirety to read as set forth in this Agreement.

                           [Signature Page Follows]

<PAGE>

      The Debtor and the Secured Party have caused this Agreement to be duly
executed and delivered as of the date first above written.

                                           DEBTOR:

                                           DIGITAL LIGHTWAVE, INC.

                                           By:  ____________________________

                                           Name:___________________________

                                           Title:  ___________________________

                                           SECURED PARTY:

                                           OPTEL, LLC

                                           By:  ____________________________

                                           Name:___________________________

                                           Title:  ___________________________

#<PAGE>

                                                                     EXHIBIT 4.2

                                 AMENDMENT NO. 1
                                       TO
                          SECURITIES PURCHASE AGREEMENT

         Reference is hereby made to the Securities Purchase Agreement (the
"AGREEMENT") made and entered into as of December 13, 2002, by and among
netGuru, Inc., a Delaware corporation (the "COMPANY") and Laurus Master Fund,
Ltd., a Cayman Islands company (the "PURCHASER"). Terms used herein and not
otherwise defined herein shall have the meaning set forth in the Agreement.

         WHEREAS, the parties desire to amend Section 8.4 of the Agreement; and

         WHEREAS, in consideration of their mutual promises and covenants set
forth herein and in the Agreement, and for other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
parties hereto agree as follows:

         1. Pursuant to Section 12.6 of the Agreement, and effective as of
December 13, 2002, the parties amend and restate Section 8.4 of the Agreement in
its entirety as follows:

         8.4 NASDAQ APPROVAL. The Company and the Purchaser agree that, until
the Company either obtains shareholder approval of the issuance of the
Securities, or an exemption from NASDAQ's corporate governance rules as they may
apply to the Securities, and an opinion of counsel reasonably acceptable to the
Purchaser that NASDAQ's corporate governance rules do not conflict with nor may
result in a delisting of the Company's common stock from the NASDAQ National
Market (the "APPROVAL") upon the conversion of the Notes or the exercise of the
Warrant, the Purchaser may not receive, whether upon conversion of the Notes or
upon exercise of the Warrant, more than the number of common shares that would
increase the Purchaser's total holdings of the Company's common stock to greater
than 19.9% of the shares of Company's common stock outstanding on the Closing
Date. The Company covenants to attempt to obtain the Approval required pursuant
to NASDAQ's corporate governance rules to allow conversion of all the Notes and
interest thereon upon written request of the Purchaser (the "TRIGGER DATE"). The
Company further covenants to file the preliminary proxy statement relating to
the Approval with the Commission on or before thirty days after the Trigger Date
("PROXY FILING DATE"). The Company further covenants to take all steps necessary
to require shareholders to vote on the Approval no later than ninety days after
the Trigger Date ("APPROVAL DATE").

         2. There are no other modifications to the Agreement.

Dated:   March 19, 2003                       March 19, 2003

AGREED TO AND ACCEPTED                        AGREED TO AND ACCEPTED
BY NETGURU, INC.                              BY LAURUS MASTER FUND, LTD.

By: /s/ Jyoti Chatterjee                      By: /s/ David Grin
    -------------------------------               ------------------------------
Name:  Jyoti Chatterjee                           Name:  David Grin
Title: President                                  Title: Director

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