EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN

1.  PURPOSE
    _______
    The purpose of this 1994 Stock Option Plan (the "Plan") is to advance
the interests of LightStream Corporation (the "Company") by enhancing the
ability of the Company and its parent and subsidiaries to attract and
retain able employees, consultants or advisors to the Company; to reward
such individuals for their contributions; and to encourage such individuals
to take into account the long-term interests of the Company through
interests in shares of the Company's common stock, $.01 par value (the
"Stock").  Any employee, consultant, or advisor selected to receive an
award under the Plan is referred to as a "participant".

    Options granted pursuant to the Plan may be incentive stock options as
defined in section 422 of the Internal Revenue Code of 1986 (as from time
to time amended, the "Code") (any option that is intended so to qualify as
an incentive stock option being referred to herein as an "incentive
option"), or options that are not incentive options, or both.  Except as
otherwise expressly provided with respect to an option grant, no option
granted pursuant to the Plan shall be an incentive option.

2.  ADMINISTRATION
    ______________
    The Plan shall be administered by the Board of Directors (the "Board")
of the Company.  The Board shall have authority, not inconsistent with the
express provisions of the Plan: (a) to grant awards consisting of options
or stock appreciation rights ("SARs"), or both, to such participants as may
be selected pursuant to the provisions of the Plan; (b) to determine which
options are, and which options are not, intended to be incentive options;
(c) to determine the terms and conditions of each award; (d) to prescribe
the form or forms of any instruments evidencing awards and any other
instruments required under the Plan and to change such forms from time to
time; (e) to adopt, amend, and rescind rules and regulations for the
administration of the Plan; and (f) to interpret the Plan and to decide any
questions and settle all controversies and disputes that may arise in
connection with the Plan.  Such determinations of the Board shall be
conclusive and shall bind all parties.

    The Board may, in its discretion, delegate some or all of its powers
with respect to the Plan to a committee (the "Committee"), in which event
all references (as appropriate) to the Board hereunder shall be deemed to
refer to the Committee.  The Committee, if one is appointed, shall consist
of at least two directors.  A majority of the members of the Committee
shall constitute a quorum, and all determinations of the Committee shall be
made by a majority of its members.  Any determination of the Committee under
PAGE

                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

the Plan may be made without notice or meeting of the Committee by a writing
signed by a majority of the Committee members.  On and after registration
of the Stock under the Securities Exchange Act of 1934 (the "1934 Act"),
the Board shall delegate the power to select directors and officers to
receive awards under the Plan and the timing, pricing, and amount of such
awards to a Committee, all members of which shall be disinterested persons
within the meaning of Rule 16b-3 under the 1934 Act and "outside directors"
within the meaning of section 162(m)(4)(c)(i) of the Code.

3.  EFFECTIVE DATE AND TERM OF PLAN
    _______________________________
    The Plan shall become effective on the date on which it is approved by
the shareholders of the Company.  Grants of awards under the Plan may be
made prior to that date (but after Board adoption of the Plan), subject to
approval of the Plan by the shareholders.

    No awards shall be granted under the Plan after the completion of ten
years from the date on which the Plan was adopted by the Board, but awards
previously granted may extend beyond that date.

4.  SHARES SUBJECT TO THE PLAN
    __________________________
    (a)  Number of Shares.  Subject to adjustment as provided in Section
4(c), the aggregate number of shares of Stock that may be delivered upon
the exercise of award granted under the Plan shall be 300,000.  If any
award granted under the Plan terminates without having been exercised in
full, or upon exercise is satisfied other than by delivery of Stock, the
number of shares of Stock as to which such award was not exercised shall be
available for future grants within the limits set forth in this
Section 4(a).

    (b)  Shares to be Delivered.  Shares delivered under the Plan shall be
previously issued Stock acquired by the Company from Bolt Beranek and
Newman Inc. ("BBN") and held in the Company's treasury.  No fractional
shares of Stock shall be delivered under the Plan.

    (c)  Changes in Stock.  In the event of a stock dividend, stock split,
or combination of shares, recapitalization, or other change in the
Company's capital stock, the number and kind of shares of stock or
securities of the Company subject to awards then outstanding or
subsequently granted under the Plan, the exercise price of such awards, the
maximum number of shares or securities that may be delivered under the
Plan, and other relevant provisions shall be appropriately adjusted by the
Board, whose determination shall be binding on all persons.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

    The Board may also adjust the number of shares subject to outstanding
awards, the exercise price of outstanding awards, and the terms of
outstanding awards, to take into consideration material changes in
accounting practices or principles, extraordinary dividends, consolidations
or mergers (except as described in Section 6(j)), acquisitions or
dispositions of stock or property, or any other event if it is determined
by the Board that such adjustment is appropriate to avoid distortion in the
operation of the Plan, provided that no such adjustment shall be made in
the case of an incentive option, without the consent of the participant, if
it would constitute a modification, extension, or renewal of the option
within the meaning of section 424(h) of the Code.

5.  ELIGIBILITY FOR AWARDS
    ______________________
    Persons eligible to receive awards under the Plan ("eligible persons")
shall be those employees of, or consultants or advisors to, the Company,
BBN, or a subsidiary of either of them who are in a position to make a
contribution to the Company.  Awards shall be made only to such eligible
persons, at such times and in such amounts, and on such terms, as shall
from time to time be recommended by BBN and communicated in writing to the
Company.  No awards shall be made under the Plan unless at the time of the
award BBN is the parent of the Company.

    A parent for purposes of the Plan shall be a corporation which owns,
directly or indirectly, 50% or more of the total combined voting power of
all classes of the Company's stock.  A subsidiary for purposes of the Plan
shall be (i) a corporation in which the Company owns, directly or
indirectly, stock possessing 50% or more of the total combined voting power
of all classes of stock, or (ii) a corporation in which the Company's
parent owns, directly or indirectly, stock possessing 50% or more of the
total combined voting power of all classes of stock.  An award or awards
covering up to the entire number of shares available for issuance under the
Plan (as determined under Section 4(a)), to any one participant or to
several participants may be granted, in the sole discretion of BBN.

    Incentive options shall be granted only to "employees" as defined in
the provisions of the Code or regulations thereunder applicable to
incentive stock options.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

6.  TERMS AND CONDITIONS OF OPTIONS AND SARs
    ________________________________________
    (a)  Exercise Price of Options.  The exercise price of each option
shall be determined by the Board but in the case of an incentive option
shall not be less than 100% (110%, in the case of an incentive option
granted to a ten-percent shareholder) of the fair market value of the Stock
at the time the option is granted.  For this purpose, "fair market value"
in the case of incentive options shall have the same meaning as it does in
the provisions of the Code and the regulations thereunder applicable to
incentive options; and "ten-percent shareholder" shall mean any participant
who at the time of grant owns directly, or by reason of the attribution
rules set forth in section 424(d) of the Code is deemed to own, stock
possessing more than 10% of the total combined voting power of all classes
of stock of the Company or of any of its parent or subsidiary corporations.

    (b)  Duration of Options.  An option shall be exercisable during such
period or periods as may be specified in the award.  The latest date on
which an option may be exercised (the "Final Exercise Date") shall be the
date which is ten years (five years, in the case of an incentive option
granted to a "ten-percent shareholder" as defined in (a) above) from the
date the option was granted or such earlier date as may be specified in the
award.

   (c) Exercise of Options.

   (1) An option shall become exercisable at such time or times and upon
       such conditions as shall be specified in the award.  In the case of
       an option not immediately exercisable in full, the Board may, upon
       advice from BBN, at any time accelerate the time at which all or
       any part of the option may be exercised.

   (2) Any exercise of an option shall be in writing, signed by the proper
       person and furnished to the Company, accompanied by (i) such
       documents, representations, agreements, and certifications as may
       be required by the Board and (ii) payment in full as specified
       below in Section 6(d) for the number of shares for which the option
       is exercised.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

   (3) In the case of an option that is not an incentive option, the Board
       shall have the right to require that the participant exercising the
       option remit to the Company an amount sufficient to satisfy any
       federal, state, or local withholding tax requirements (or make
       other arrangements satisfactory to the Company with regard to such
       taxes) prior to the delivery of any Stock pursuant to the exercise
       of the option.  If permitted by the Board either at the time of the
       grant of the option or the time of exercise, the participant may
       elect, at such time and in such manner as the Board may prescribe,
       to satisfy such withholding obligation by (i) delivering to the
       Company Stock owned by such individual having a fair market value
       equal to such withholding obligation, or (ii) requesting that the
       Company withhold from the shares of Stock to be delivered upon the
       exercise a number of shares of Stock having a fair market value
       equal to such withholding obligation.

       In the case of an incentive option, the Board may require as a
       condition of exercise that the participant exercising the option
       agree to inform the Company promptly of any disposition (within the
       meaning of section 424(c) of the Code and the regulations
       thereunder) of Stock received upon exercise.  In addition, if at
       the time the option is exercised the Board determines that under
       applicable law and regulations the Company could be liable for the
       withholding of any federal or state tax with respect to a
       disposition of the Stock received upon exercise, the Board may
       require as a condition of exercise that the participant exercising
       the option agree to give such security as the Board deems adequate
       to meet the potential liability of the Company for the withholding
       of tax, and to augment such security from time to time in any
       amount reasonably deemed necessary by the Board to preserve the
       adequacy of such security.

   (4) If an option is exercised by the executor or administrator of a
       deceased participant, or by the person or persons to whom the
       option has been transferred by the participant's will or the
       applicable laws of descent and distribution, the Company shall be
       under no obligation to deliver Stock pursuant to such exercise
       until the Company is satisfied as to the authority of the person or
       persons exercising the option.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

    (d)  Payment for Stock.  Stock purchased upon exercise of an option
under the Plan shall be paid for as follows:  (i) in cash, check acceptable
to the Company (determined in accordance with such guidelines as the Board
may prescribe), or money order payable to the order of the Company, or (ii)
if so permitted by the terms of the option award (or, in the case of an
option that is not an incentive option, at such later time as the Board may
determine, such determination to be made upon advice from BBN if BBN is
still the Company's parent), (A) through the delivery of shares of Stock
(which, in the case of Stock acquired from the Company, shall have been
held for at least six months unless the Board specifies a shorter period)
having a fair market value on the date of exercise equal to the purchase
price, or (B) by delivery of a promissory note of the participant to the
Company, such note to be payable on such terms as are specified by the
Board, or (C) by delivery of an unconditional and irrevocable undertaking
by a broker to deliver promptly to the Company sufficient funds to pay the
exercise price, or (D) by any combination of the permissible forms of
payment.

    (e)  Stock Appreciation Rights.  The Board, upon advice from BBN, may
grant SARs either in tandem with or independent of options awarded under
the Plan.  Except as hereinafter provided, each SAR will entitle the
participant to receive upon exercise, with respect to each share of Stock
to which the SAR relates, the excess of (i) the share's value on the date
of exercise, over (ii) the share's fair market value on the date it was
granted.  For purposes of clause (i), "value" shall mean fair market value;
provided, that the Board may adjust such value to take into account
dividends on the Stock and may also grant SARs that provide, in such
limited circumstances following a change in control of the Company (as
determined by the Board) as the Board may specify, that "value" for
purposes of clause (i) is to be determined by reference to an average value
for the Stock during a period immediately preceding the change in control,
all as determined by the Board.  The amount payable to a participant upon
exercise of an SAR shall be paid either in cash or in shares of Stock, as
the Board, upon advice from BBN, determines.  Each SAR shall be exercisable
during such period or periods and on such terms as the Board, upon advice
from BBN, may specify.  No SAR shall be exercisable after the date which is
ten years from the date of grant.

    (f)  Delivery of Stock.  A participant shall not have the rights of a
shareholder with regard to awards under the Plan except as to Stock
actually received by such participant under the Plan.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

    The Company shall not be obligated to deliver any shares of Stock (i)
until, in the opinion of the Company's counsel, all applicable federal and
state laws and regulations have been complied with, (ii) if the outstanding
Stock is at the time listed on any stock exchange, until the shares to be
delivered have been listed or authorized to be listed on such exchange upon
official notice of issuance, and (iii) until all other legal matters in
connection with the issuance and delivery of such shares have been approved
by the Company's counsel.  If the sale of Stock has not been registered
under the Securities Act of 1933, as amended, the Company may require, as a
condition to exercise of the award, such representations or agreements as
counsel for the Company may consider appropriate to avoid violation of such
Act and may require that the certificates evidencing such Stock bear an
appropriate legend restricting transfer.

    (g)  Nontransferability of Awards.  No award may be transferred other
than by will or by the laws of descent and distribution, and during a
participant's lifetime an award may be exercised only by him or her.

    (h)  Death.  Except as otherwise provided in an award, if a participant
dies, each award held by the participant immediately prior to death may be
exercised, to the extent it was exercisable immediately prior to death, by
his executor or administrator, or by the person or persons to whom the
award is transferred by will or the applicable laws of descent and
distribution, at any time within the period ending (i) 180 days after the
participant's death (in the event the participant's employment or other
service relationship with the Company, its parent, or a subsidiary of
either shall terminate by reason of death), or (ii) 120 days after the
participant's death (in the event the participant dies within the 60-day
period following termination of the participant's employment or other
service relationship with the Company, its parent, or a subsidiary of
either), or such longer period as the Committee may determine.  In no event
shall an award be exercised beyond the Final Exercise Date.  Except as
otherwise provided in an award, all awards held by a participant
immediately prior to death that are not then exercisable shall terminate on
the date of death.

    (i)  Other Termination of Service.  Except as otherwise provided in an
award, if a participant's employment or other service relationship with the
Company terminates for any reason other than death, all awards held by the
participant shall terminate to the extent not exercisable immediately prior
to such event.  To the extent exercisable immediately prior to termination
of employment or other service, the award shall continue to be exercisable
thereafter for a period of 60 days (or such longer period as the
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

Board may determine, but in no event beyond the Final Exercise Date),
unless the participant's employment or other service relationship is
terminated for "cause" as a result of the participant's misconduct which,
in the judgment of the Board, casts discredit on him or her, or is
otherwise harmful to the business, interests, or reputation of the Company,
its parent, or a subsidiary, in which case all awards shall terminate
immediately.  The Board may in any award provide for post-termination
exercise provisions different from those expressly set forth in the
preceding two sentences or in (h) above, including without limitation terms
allowing a later exercise by a former employee, consultant, or advisor (or,
in the case of a former employee, consultant, or advisor who is deceased,
the person or persons to whom the award is transferred by will or the laws
of descent and distribution) as to all or any portion of the award not
exercisable immediately prior to termination or employment or other service
relationship, but in no case may an award be exercised after the Final
Exercise Date.  Except as otherwise provided in an award, after completion
of that 60-day or longer period, such awards shall terminate to the extent
not previously exercised, expired, or terminated.  For purposes of this
Plan, the service relationship shall not be considered terminated (i) in
the case of sick leave or other bona fide leave of absence approved for
purposes of the Plan by the Board, upon advice from BBN, so long as the
participant's right to reemployment or continued service is guaranteed
either by statute or by contract, or (ii) in the case of a transfer of
employment or service relationship between the Company and a subsidiary or
parent, or between subsidiaries of the Company or parent (provided the
participant's direct or indirect service to the Company continues), or to
the service of a corporation (or a parent or subsidiary corporation of such
corporation) issuing or assuming an award in a transaction to which section
424(a) of the Code applies.

    (j)  Mergers, etc.  In the event of any merger, consolidation,
dissolution, or liquidation of the Company, the Board in its sole
discretion may, as to any outstanding awards, make such substitution or
adjustment in the aggregate number of shares reserved for issuance under
the Plan and in the number and purchase price (if any) of shares subject to
such awards as it may determine, or accelerate, amend, or terminate such
awards upon such terms and conditions as it shall provide (which, in the
case of the termination of the vested portion of any award, shall require
payment or other consideration which the Board deems equitable in the
circumstances).

    (k)  Cancellation of Awards.  The Board may provide in any award that
the award shall be cancelled or rescinded and any associated shares
forfeited, and the participant shall be obligated to pay to the Company any
gain received upon exercise, in the event that the participant competes
with the Company, discloses confidential information of the Company, or
otherwise is not in compliance with applicable provisions of any award, in
each case on such terms and conditions as the Board considers appropriate
in the circumstances.
 
                               EXHIBIT 10.15
                          LIGHTSTREAM CORPORATION
                          1994 STOCK OPTION PLAN
                                (continued)

7.  EMPLOYMENT RIGHTS
    _________________
    Neither the adoption of the Plan nor the grant of awards shall confer
upon any participant any right to continue as an employee of, or consultant
or advisor to, the Company, its parent, or any subsidiary of either or
affect in any way the right of the Company, its parent, or a subsidiary of
either to terminate the participant's relationship at any time.  Except as
specifically provided by the Board in any particular case, the loss of
existing or potential profit in awards granted under this Plan shall not
constitute an element of damages in the event of termination of the
relationship of a participant even if the termination is in violation of an
obligation of the Company, its parent, or a subsidiary of either to the
participant by contract or otherwise.

8.  EFFECT, DISCONTINUANCE, CANCELLATION, AMENDMENT, AND TERMINATION
    ________________________________________________________________
    Neither adoption of the Plan nor the grant of awards to a participant
shall affect the Company's right to make awards to such participant that
are not subject to the Plan, to issue to such participant Stock as a bonus
or otherwise, or to adopt other plans or arrangements under which Stock may
be issued.

    The exercise of certain awards granted under the Plan may be made
contingent upon the closing of an initial public offering of the Company's
Stock.  The grant of such awards under the Plan shall in no way obligate
the Company to consummate or consider a public offering of Stock, and the
failure of the Company to close a public offering of Stock shall not
entitle a participant granted such an award to any substitute award or
other benefit, or to any damages.

    The Board may at any time discontinue granting awards under the Plan.
With the consent of the participant and BBN, the Board may at any time
cancel an existing award in whole or in part and grant another award for
such number of shares as the Board specifies.  The Board may at any time or
times amend the Plan or any outstanding award for the purpose of satisfying
the requirements of section 422 of the Code or of any changes in applicable
laws or regulations or for any other purpose that may at the time be
permitted by law, or may at any time terminate the Plan as to any further
grants of awards; except that no such amendment shall adversely affect the
rights of any participant (without his or her consent) under any award
previously granted and no such amendment shall, while BBN remains the
Company's parent, modify those provisions of the Plan relating to BBN
without BBN's written consent.