Document:

OPTEL, LLC

To:           Digital Lightwave, Inc. ("Borrower")

From:         Optel, LLC ("Lender")

Date:         April 15, 2003

                                   TERM SHEET

This Term Sheet (this "Term Sheet") sets forth the principal terms and
conditions upon which Lender is prepared to make available a credit facility to
Lender (the "Facility"). The final terms of the Facility shall be subject to
execution and delivery by Borrower of the documents outlined below, including
without limitation a loan and security agreement in form and substance
satisfactory to Lender (the "Loan Agreement").

I.       PARTIES:

         BORROWER:                  Digital Lightwave, Inc., a Delaware
                                    corporation.

         LENDER:                    Optel, LLC ("Optel"), a Delaware limited
                                    liability company.

II.      PRINCIPAL CREDIT TERMS:

         COMMITMENT:                $10,000,000. In addition, the $1,960,000
                                    aggregate principal amount of loans
                                    previously advanced by Lender to Borrower as
                                    evidenced by (i) that certain Secured
                                    Promissory Note, dated as of February 14,
                                    2003 in the principal amount of $800,000,
                                    (ii) that certain Secured Promissory Note,
                                    dated as of February 26, 2003, in the
                                    principal amount of $650,000, (iii) that
                                    certain Secured Promissory Note, dated as of
                                    March 28, 2003, in the principal amount of
                                    $450,000, and (iv) that certain Secured
                                    Promissory Note, dated as of April 2, 2003,
                                    in the principal amount of $60,000
                                    (collectively, the "Notes"), shall be
                                    amended and restated in order to be
                                    evidenced and secured by the Loan and
                                    Security Agreement.

         COMMITMENT PERIOD:         April 15, 2003 to December 31, 2003 (the
                                    "Commitment Period"). All advances under the
                                    facility (the "Advances") are repayable in
                                    full on July 31, 2004, subject to
                                    acceleration upon a change of control, the
                                    voluntary or involuntary filing of a
                                    bankruptcy proceeding involving Borrower, or
                                    other Events of Default as outlined herein
                                    (the "Maturity Date").

         ADVANCES:                  Each Advance shall be in a minimum amount of
                                    $1,000,000. Borrower shall request each
                                    Advance by delivering to Lender a written
                                    request in form and substance satisfactory
                                    to Lender and, other than for the initial
                                    Advance, at least five (5) business days
                                    prior to the date of the requested Advance,.

         CLOSING DATE:              To be determined.
<PAGE>

         INTEREST:                  Each Advance shall bear interest at ten
                                    percent (10%) per annum. Interest on each
                                    Advance shall accrue on a monthly basis and
                                    shall be capitalized and added to the
                                    outstanding principal amount of each such
                                    Advance. All accrued and unpaid interest
                                    will be repaid in full on the Maturity Date.

         DEFAULT INTEREST RATE:     Upon the occurrence and during the
                                    continuation of any Event of Default (as
                                    defined below), the total outstanding
                                    Advances shall bear interest at a per annum
                                    rate equal to the fifteen percent (15%) per
                                    annum.

         INTEREST AND FEE
         CALCULATIONS:              All interest and fees to be computed on the
                                    basis of a 365/366 day year for actual days
                                    elapsed.

         TERMS OF REPAYMENT:        Borrower shall repay the principal amount of
                                    each Advance in full on the Maturity Date.

         OPTIONAL PREPAYMENTS:      Borrower may, at its option, prepay the
                                    principal amount of any Advance in whole or
                                    in part upon five (5) business days' notice
                                    to Lender. Borrower shall not have the right
                                    to re-borrow any Advance to the extent it
                                    has been repaid.

         PURPOSE:                   The proceeds of each Advance shall be used
                                    by Borrower for its general corporate
                                    purposes, including operational and capital
                                    expenditures and repayment of existing
                                    indebtedness.

         DOCUMENTATION:             The facility shall be evidenced by a Loan
                                    and Security Agreement between Borrower and
                                    Lender (the "Loan Agreement") and certain
                                    other documents, instruments and agreements
                                    described herein, including without
                                    limitation, a promissory note (collectively,
                                    the "Credit Documents").

         SECURITY:                  The obligations of Borrower will be secured
                                    by a perfected first priority security
                                    interest in all personal property assets of
                                    Borrower.

         CONDITIONS PRECEDENT:      Conditions customary for transactions of
                                    this type in light of Borrower's current
                                    financial condition, including, but not
                                    limited to the following:

                                    (1) With respect to the initial Advance
                                    (unless waived), Lender shall have received
                                    the following, each in form and substance
                                    satisfactory to Lender:

                                             (a) The executed Credit Documents.

                                             (b) Such articles, bylaws,
                                             operating agreements, resolutions,
                                             shareholder approvals, good
                                             standing certificates and other
                                             organizational documents as Lender
                                             shall reasonably request to
                                             evidence the good standing of
                                             Borrower and the authority of
                                             Borrower to execute, deliver and
                                             perform the Credit Documents.

                                             (c) Such financial statements,
                                             audits, appraisals, cash flow
                                             projections, pro forma balance
                                             sheets,

                                       2
<PAGE>

                                             business plans and other financial
                                             information, projections and plans
                                             for Borrower as Lender may
                                             reasonably request.

                                             (d) UCC financing statements
                                             (appropriately completed and
                                             executed) for filing in such
                                             jurisdictions as Lender may request
                                             to perfect the liens granted to
                                             Lender pursuant to the Loan
                                             Agreement.

                                             (e) Such other documents,
                                             instruments and agreements
                                             (including stock certificates and
                                             stock powers) as Lender may request
                                             to establish and perfect the liens
                                             granted to Lender under the Loan
                                             Agreement.

                                             (f) Such other instruments,
                                             agreements, certificates and other
                                             documents as Lender may request.

                                             (g) Favorable written opinion from
                                             counsel for Borrower, dated the
                                             Closing Date, addressed to Lender,
                                             covering such legal matters as
                                             Lender may reasonably request and
                                             otherwise in form and substance
                                             satisfactory to Lender.

                                    (2) Each Advance shall be conditioned upon
                                    no default under the Loan Agreement, no
                                    material adverse change in light of
                                    Borrower's current financial condition and
                                    all representations and warranties being
                                    accurate.

         REPRESENTATIONS
         AND WARRANTIES:            Representations and warranties customary for
                                    transactions of this type, including without
                                    limitation, representations as to
                                    organization and good standing, legal
                                    authority, corporate approval,
                                    enforceability of Credit Documents,
                                    compliance with laws and other agreements,
                                    trade names and styles, patents and other
                                    rights, location of business, title to
                                    assets, maintenance of collateral,
                                    litigation, financial statements and
                                    condition, taxes and pension contributions,
                                    no material adverse change and accuracy of
                                    information. Optel acknowledges that due to
                                    Borrower's current financial condition it
                                    currently could not give unqualified
                                    representations regarding certain of the
                                    representations proposed above and that this
                                    fact shall be addressed in the Loan
                                    Agreement.

         COVENANTS:                 Customary for a transaction of this type,
                                    including but not limited to the following:

                                    (1) Reporting:

                                             (a) Within 90 days after each
                                             year-end, financial statements of
                                             Borrower audited by an independent
                                             public accounting firm acceptable
                                             to Lender.

                                             (b) Within 30 days after each
                                             month-end, monthly unaudited
                                             financial statements of Borrower.

                                       3
<PAGE>

                                             (c) Within 60 days prior to the
                                             commencement of each fiscal year, a
                                             budget and business plan for
                                             Borrower for such fiscal year.

                                             (d) Contemporaneously with the
                                             delivery of the monthly and
                                             year-end financial statements, a
                                             compliance certificate of the
                                             Borrower which states that (i) no
                                             Event of Default has occurred and
                                             is continuing and (ii) Borrower is
                                             in compliance with each of the
                                             covenants set forth in the Credit
                                             Documents.

                                             (e) Other reporting customary for a
                                             transaction of this type and
                                             additional reporting appropriate in
                                             the reasonable judgment of Lender
                                             for this transaction.

                                    (2) Other covenants in light of Borrower's
                                    current financial condition customary for
                                    transactions of this type and additional
                                    covenants appropriate in the reasonable
                                    judgment of Lender for this transaction,
                                    including, without limitation, covenants
                                    obligating Borrower to maintain accurate
                                    books and records, permit inspections and
                                    audits, maintain insurance, pay taxes when
                                    due, use Advances as agreed, maintain
                                    business and assets and comply with laws and
                                    contracts; and covenants which limit mergers
                                    and acquisitions, asset acquisitions and
                                    dispositions outside ordinary course of
                                    business, transactions outside ordinary
                                    course of business, loans and other
                                    investments outside ordinary course of
                                    business, additional indebtedness, liens,
                                    dividends and redemptions, increases in
                                    management compensation or dissolutions.

         DEFAULT:                   Events of Default customary for transactions
                                    of this type in light of Borrower's current
                                    financial condition.

         INDEMNIFICATION:           Borrower shall indemnify Lender (on an
                                    after-tax basis) for all taxes and other
                                    liabilities arising from the transaction
                                    except to the extent arising from the gross
                                    negligence or willful misconduct of such
                                    persons.

         RISK TRANSFER
         PROVISIONS:                The documentation shall include rights of
                                    assignment and participation. Borrower shall
                                    covenant and agree to assist Lender with
                                    respect to any such assignments or
                                    participations

         GOVERNING LAW:             New York

         OTHER TERMS:               This Term Sheet is not intended to be all
                                    inclusive. If and when executed, the Credit
                                    Documents will contain other terms and
                                    conditions.

                                       4
<PAGE>

BY ACKNOWLEDGING THIS TERM SHEET BELOW, BORROWER HAS EXPRESSED ITS ACCEPTANCE OF
THE TERMS AND CONDITIONS FOR THE FACILITY SET FORTH ABOVE. IF BORROWER DOES NOT
ACKNOWLEDGE AND RETURN THIS TERM SHEET TO LENDER BY APRIL 15, 2003, LENDER WILL
CONSIDER THAT BORROWER DOES NOT ACCEPT THE TERMS SET FORTH ABOVE AND THIS TERM
SHEET SHALL AUTOMATICALLY TERMINATE AND SHALL BE OF NO FURTHER FORCE OR EFFECT.

ACKNOWLEDGED:

BORROWER:                               DIGITAL LIGHTWAVE, INC.

                                        By:__________________________________
                                           Name:_____________________________
                                           Title:____________________________

LENDER:                                 OPTEL, LLC

                                        By:___________________________________
                                           Chris Phillips
                                           Chief Financial Officer

                                       5
<PAGE>

                                   Optel, LLC
-------------------------------------------------------------------------------
     6200 Courtney Campbell CSWY, Suite 740 Tampa, FL 33607 (T) 813-287-6337
                                (F) 813-287-2886

Via Email: bhussey@lightwave.com

April 15, 2003

Digital Lightwave, Inc.
15550 Lightwave Drive
Clearwater, FL  33760
Attn: Robert Hussey

         Re: $10,000,000 CREDIT FACILITY

Dear Bob:

         Optel, LLC ("Optel") is pleased to offer to Digital Lightwave, Inc.
(the "Company") the credit facility described in Attachment A hereto (the
"Facility"). This letter and Attachment A outline the principal terms and
conditions upon which Optel is prepared to make available the Facility to the
Company. The final terms and conditions of the Facility shall be subject to the
execution and delivery by the parties of the Loan Agreement and the other Credit
Documents described in Attachment A, each in form and substance satisfactory to
Optel.

         In consideration of Optel's commitment, the Company agrees to indemnify
and hold harmless each of Optel and its officers, directors, employees, agents,
advisors and affiliates for all claims, damages, losses, liabilities and
expenses (including, without limitation, reasonable fees and disbursements of
counsel) incurred by any of them in connection with this commitment letter, the
Facility, the use by the Company of the Facility or the proceeds thereof, the
collateral for the Facility, the Credit Documents, any related document,
instrument or agreement or any transaction contemplated hereby or thereby
whether or not such transactions are consummated, except for the portion of such
claims, damages, losses, liabilities and expenses caused by such party's gross
negligence or willful misconduct.

         If the commitment herein and in Attachment A are satisfactory, please
indicate the Company's acceptance by having an authorized officer of the Company
countersign Attachment A and delivering the executed copy to Optel no later than
April 15, 2003. Upon the acceptance of the commitment offer set forth in this
letter, Optel will instruct its counsel (Orrick, Herrington & Sutcliffe LLP) to
commence documentation. If the Company accepts this offer, Optel's commitment
shall continue until April 25, 2003, on which date such commitment shall expire
unless the Loan Agreement and the related Credit Documents have been executed by
Optel and the Company.

         This letter shall be governed by and construed in accordance with the
laws of the State of Delaware without regard to conflicts of law principles.
Optel's commitment is personal to the Company and may not be transferred or
assigned to any other party without the prior written consent of Optel and any
such purported transfer shall be void. Except as otherwise required by law,
neither this letter nor any part hereof may, without the prior written consent
of Optel, be disclosed or exhibited to any other party except the Company's
accountants, attorneys and other advisors, and then, in each case, only in
connection with the transactions contemplated hereby and on a confidential
basis. This letter may not be amended or any provision hereof waived or modified
except by an instrument in writing signed by Optel.

<PAGE>

         We look forward to working with you on this transaction. Please let us
know if you have any questions.

                                            Very truly yours,

                                            OPTEL, LLC

                                            By: _______________________________
                                                Chris Phillips
                                                Chief Financial Officer

                                       2<PAGE>

March 26, 2003

Jim Green
CEO, Digital Lightwave
15550 Lightwave Drive
Clearwater, FL  33760-3533

Dear Jim,

Following up on my letter to you of March 17, 2003, I would like to confirm the
understanding between Tektronix, Inc. ("Tektronix") and Digital Lightwave, Inc.
("DLI") with respect to DLI's rights under the Lease dated March 15, 2000
between Research Place, L.L.C. as lessor, and Tektronix, as lessee, which covers
the space located in the building designated as 20 Research Place, Chelmsford,
Massachusetts (the "Lease").

Pursuant to the Asset Purchase Agreement between DLI and Tektronix, dated as of
October 30, 2002, DLI agreed to assume Tektonix's obligations under the Lease.
Pursuant to an Assignment and Assumption Agreement, dated as of November 5,
2002, Tektronix assigned to DLI its rights under the Lease, and DLI assumed
Tektronix's obligations under the Lease.

You have indicated that DLI now wishes to assign the Lease back to Tektronix.

This letter will confirm that effective as of March 26, 2003, DLI hereby assigns
all of its rights in and to the Lease to Tektronix. Nothing in this letter or in
the assignment of the Lease is intended to: (1) amend the terms or provisions of
the Asset Purchase Agreement or the Assignment and Assumption; or (2) waive any
claim either party has for breach of the Asset Purchase Agreement or the
Assignment and Assumption Agreement.

This will also confirm that DLI will continue to perform warranty and repair
services for the OTT products.

In return for these considerations, we will allow DLI employees (those who
remain employed at the Chelmsford site) to utilize their current quarters for up
to three months, and we will continue to maintain our network connection for
those employees for a period not to exceed three months. We understand this
employment load to be small.

<PAGE>

Page 2

If this letter accurately sets forth our agreement, please sign in the space
indicated below and return a signed copy to me by fax. Also, please let me know
how we can arrange to pick up the keys to the facility.

Sincerely,

Richard T. King
Vice President, Optical Product Line

ACCEPTED:

DIGITAL LIGHTWAVE, INC.

By:
   ----------------------------------

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