TELLABS INC
SC 13D, 1998-02-26
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE> 1

                   SECURITIES AND EXCHANGE COMMISSION
                         Washington, D.C. 20549
               _________________________________________

                              SCHEDULE 13D


               Under the Securities Exchange Act of 1934

              COHERENT COMMUNICATIONS SYSTEMS CORPORATION
                            (Name of Issuer)


                      Common Stock, $.01 Par Value
                     (Title of Class of Securities)


                               192478105
                             (CUSIP Number)


                          Carol Coghlan Gavin
                               Secretary
                             Tellabs, Inc.
                          4951 Indiana Avenue
                       Lisle, Illinois 60532-1698
                             (630) 378-8800
             (Name, Address and Telephone Number of Person
           Authorized to Receive Notices and Communications)


                           February 16, 1998
        (Date of Event which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the
following box:
(  ).

The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 (the "Act") or otherwise subject to the liabilities
of that section of the Act but shall be subject to all other provisions
of the Act (however, see the Notes).

(Continued on following pages)

<PAGE>
<PAGE> 2

                              SCHEDULE 13D

CUSIP No. 192478105

1   NAME OF
    REPORTING
    PERSON

    Tellabs, Inc.

2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

    (a)(  )     (b)(  )

3   SEC USE ONLY

4   SOURCE OF FUNDS

    NA

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
	PURSUANT TO ITEMS 2(d) or 2(e) 
    (a)(  )     (b)(  )

6   CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

NUMBER OF         7   SOLE VOTING POWER
SHARES
BENEFICIALLY      8   SHARED VOTING POWER
OWNED BY EACH         6,031,391*
REPORTING 
PERSON WITH       9   SOLE DISPOSITIVE POWER

                 10   SHARED DISPOSITIVE POWER
                      6,031,391*

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    6,031,391*

<PAGE>
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12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
    SHARES
    (a)(  )     (b)(  )
 
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    38.9%

14  TYPE OF REPORTING PERSON

    CO

*Reporting Person disclaims beneficial ownership of all shares.

<PAGE>
<PAGE> 4

Item 1.		Security and Issuer
            -------------------
            The class of equity securities to which this Statement
            relates is the common stock, $.01 par value per share
            ("Coherent Common Stock"), of Coherent Communications
            Systems Corporation, a Delaware corporation ("Coherent").
            Coherent's principal executive offices are located at 45085
            University Drive, Ashburn, Virginia 20147.

Item 2.		Identity and Background
            -----------------------
            This Statement is filed by Tellabs, Inc., a Delaware
            corporation ("Tellabs"), whose principal business address is
            4951 Indiana Avenue, Lisle, Illinois 60532-1698.  Tellabs'
            principal business is to design, manufacture, market and
            service voice and data transport and network access systems.
            During the past five years, Tellabs has not been convicted
            in a criminal proceeding (excluding traffic violations or
            similar misdemeanors), nor has it been a party to a civil
            proceeding of a judicial or administrative body of competent
            jurisdiction and as a result of such proceeding was or is
            subject to a judgment, decree or final order enjoining
            future violations of, or prohibiting or mandating activities
            subject to, federal or state securities laws or finding any
            violation with respect to such laws.

            Set forth below are the names, principal occupations and
            business addresses of the executive officers and directors
            of Tellabs.  With the exception of Jukka Harju, who is a
            citizen of Finland, each executive officer and director
            listed below is a citizen of the United States of America.
            During the past five years, none of the executive officers
            or directors has been convicted in a criminal proceeding
            (excluding traffic violations or similar misdemeanors), or
            has been a party to a civil proceeding of a judicial or
            administrative body of competent jurisdiction and as a
            result of such proceeding was or is subject to a judgment,
            decree or final order enjoining future violations of, or
            prohibiting or mandating activities subject to, federal or
            state securities laws or finding any violation with respect
            to such laws.

<PAGE>
<PAGE> 5

Executive Officers of Tellabs:

NAME                    POSITION WITH TELLABS
- ----                    ---------------------

Michael J. Birck(1)     President, Chief Executive Officer and Director,
                        Tellabs, Inc.

Charles C. Cooney(1)    Vice President, Sales and Service, Tellabs
                        Operations, Inc.

Carol Coghlan Gavin(1)  Vice President, General Counsel and Secretary,
                        Tellabs Operations, Inc.; Secretary, Tellabs,
                        Inc.

J. Thomas Gruenwald(2)  Vice President, Strategic Resources, Tellabs
                        Operations, Inc.

Peter A. Guglielmi(2)   Executive Vice President, Chief Financial
                        Officer and Treasurer, Tellabs, Inc., and
                        Tellabs Operations, Inc. and Director, Tellabs,
                        Inc.

Jukka Harju(3)          Vice President and General Manager, Tellabs Oy;
                        Vice President, Tellabs International, Inc.

Brian J. Jackman(1)     President, Tellabs Operations, Inc; Executive
                        Vice President and Director, Tellabs, Inc.

J. Peter Johnson(2)     Vice President, Finance and Treasury, Assistant
                        Secretary and Controller, Tellabs, Inc., and
                        Tellabs Operations, Inc.

John C. Kohler(2)       Vice President, Manufacturing, Tellabs
                        Operations, Inc.

Harvey R. Scull(1)      Vice President, Advanced Business Development,
                        Tellabs Operations, Inc.

Richard T. Taylor(1)    Senior Vice President and General Manager,
                        Digital Systems Division, Tellabs Operations,
                        Inc.

<PAGE>
<PAGE> 6

John E. Vaughan(1)      President, Tellabs International, Inc.;
                        Executive Vice President, Tellabs, Inc.

(1)  The business address of each of these executive officers is 4951
     Indiana Avenue Lisle, Illinois 60532-1698.
(2)  The business address of each of these executive officers is 1000
     Remington Boulevard, Bolingbrook, Illinois 60440.
(3)  The business address of this executive officer is Sinikalliontie 7,
     FIN-02630, Espoo, Finland.

<PAGE>
<PAGE> 7

Directors of Tellabs:
- --------------------

                               PRINCIPAL OCCUPATION, ADDRESS OF
NAME                           EMPLOYER AND BUSINESS ADDRESS OF DIRECTOR
- ----                           -----------------------------------------

Michael J. Birck                President and Chief Executive Officer of
                                Tellabs, Inc., 4951 Indiana Avenue Lisle,
                                Illinois 60532-1698.

John D. Foulkes, Ph.D.          Director of Engineering Studies
                                (retired) University of Puget Sound;
                                Professor (retired) University of
                                Washington, 1256 S. Halsey Drive,
                                Coupeville, Washington 98239.

Peter A. Guglielmi              Executive Vice President, Chief
                                Financial Officer and Treasurer,
                                Tellabs, Inc., and Tellabs Operations,
                                Inc., 1000 Remington Boulevard,
                                Bolingbrook, Illinois 60440.

Brian J. Jackman                President, Tellabs Operations, Inc,
                                Executive Vice President, Tellabs, Inc.,
                                4951 Indiana Avenue Lisle, Illinois
                                60532-1698.

Frederick A. Krehbiel           Chief Executive Officer and Chairman
                                of the Board, Molex Incorporated, 2222
                                Wellington Court, Lisle, Illinois 60532.

Stephanie Pace Marshall, Ph.D.  President, Illinois Mathematics and
                                Science Academy, 1500 W. Sullivan Road,
                                Aurora, Illinois 60506-1000.

William F. Souders              Chairman and Chief Executive Officer
                                (retired), Emery Air Freight
                                Corporation, formerly Executive Vice
                                President, Xerox Corporation, 100 First
                                Stamford Place, Suite 402, Stamford,
                                Connecticut 06904-2340.

<PAGE>
<PAGE> 8

Jan H. Suwinski                 Professor of Strategy and Operations
                                Management-Johnson School, Cornell
                                University; Executive Vice President
                                (retired), Opto-Electronics Group,
                                Corning Incorporated; Chairman (retired)
                                Siecor Corporation, 451 Sheffield Road,
                                Ithaca, New York 14850.

<PAGE>
<PAGE> 9

Item 3.		Source and Amount of Funds or Other Consideration
            -------------------------------------------------
            The Stockholder Agreements described in Item 4 of this
            Statement were entered into by Tellabs and the Stockholders
            listed in Item 4 as an inducement to Tellabs to enter into
            the Merger Agreement described in Item 4.  Except as set
            forth in the preceding sentence, Tellabs has paid no
            consideration in connection with entering into the
            Stockholder Agreements.

Item 4.		Purpose of Transaction
            ----------------------
            On February 16, 1998, Tellabs, Inc., a Delaware corporation
            ("Tellabs"), Cardinal Merger Co., a Delaware corporation and
            a wholly-owned subsidiary of Tellabs ("Sub"), and Coherent
            Communications Systems Corporation, a Delaware corporation
            ("Coherent"), entered into an Agreement and Plan of Merger
            (the "Merger Agreement"), providing for the merger of Sub
            with and into Coherent (the "Merger"), with Coherent
            surviving the Merger and becoming a wholly- owned subsidiary
            of Tellabs.  Pursuant to the Merger Agreement, by virtue of
            the Merger each outstanding share of Coherent Common Stock
            (other than shares held by Coherent or its subsidiaries,
            Tellabs, Sub or any other wholly-owned subsidiaries of
            Tellabs) will be converted into the right to receive .72 of
            a share of common stock, $.01 par value per share, of
            Tellabs. Pursuant to the Merger Agreement, the directors of
            Sub immediately prior to the consummation of the Merger and
            Lawrence J.Gallick, Charles A. Root, Charles M. Skibo and
            Ernst Volgenau, current directors of Coherent, will become
            the directors of Coherent upon the effectiveness of the
            Merger.  At the effective time of the Merger, in accordance
            with the Merger Agreement, the Certificate of Incorporation
            of Coherent shall be amended to provide that the authorized
            capital stock of Coherent will be 1,000 shares of Coherent
            Common Stock and the present Bylaws of Sub will become the
            Bylaws of Coherent.  It is anticipated that, following the
            consummation of the Merger, the Coherent Common Stock will
            be delisted from the Nasdaq National Market and the Coherent
            Common Stock will be terminated from registration pursuant
            to Section 12(g)(4) of the Securities Exchange Act of 1934,
            as amended.  A copy of the Merger Agreement is included as

<PAGE>
<PAGE> 10

            Exhibit 1 hereto and the description of the Merger Agreement
            contained herein is qualified in its entirety by reference
            to such exhibit, which is incorporated herein by reference.

            Concurrently with the execution of the Merger Agreement, in
            order to induce Tellabs to enter into the Merger Agreement,
            Safeguard Scientifics, Inc. ("Safeguard"), the owner of
            4,843,342 (approximately 31.2%) of the outstanding shares of
            Coherent Common Stock, and Daniel L. McGinnis, Lawrence J.
            Gallick, Warren V. Musser, Charles A. Root, Charles Skibo
            and Ernst Volgenau, who are all of the current directors of
            Coherent (together with Safeguard, the "Stockholders") and
            who own an aggregate of 1,188,049 (approximately 7.7%) of
            the outstanding shares of Coherent Common Stock, entered
            into stockholder agreements (the "Stockholder Agreements")
            with Tellabs.

            The Stockholder Agreements provide, among other things,
            that: (a) at the stockholders meeting of Coherent to be held
            to approve and adopt the Merger Agreement (or at any
            adjournment thereof) or in any other circumstances upon
            which a vote, consent or other approval with respect to the
            Merger or the Merger Agreement is sought, the Stockholder
            shall vote (or cause to be voted) the shares of Coherent
            Common Stock owned by such Stockholder as of the date of the
            Stockholder Agreement and any other shares of capital stock
            of Coherent acquired by such Stockholder after the date of
            the Stockholder Agreement and during the term of the
            Stockholder Agreement (the "Subject Shares") in favor of the
            Merger, the adoption of the Merger Agreement and the
            approval of the terms thereof and each of the other
            transactions contemplated by the Merger Agreement; (b) at
            any meeting of stockholders of Coherent or at any
            adjournment thereof or in any other circumstances upon which
            the Stockholder's vote, consent or other approval is sought,
            the Stockholder shall vote (or cause to be voted) the
            Subject Shares against (i) any merger agreement or merger
            (other than the Merger Agreement and the Merger),
            consolidation, combination, sale of substantial assets,
            reorganization, recapitalization, dissolution, liquidation

<PAGE>
<PAGE> 11

            or winding up of or by Coherent or any subsidiary thereof or
            any other Takeover Proposal (as defined in the Merger
            Agreement) or (ii) any amendment of the Certificate of
            Incorporation of Coherent or the Bylaws of Coherent or other
            proposal or transaction involving Coherent or any of its
            subsidiaries, which amendment or other proposal or
            transaction would in any manner impede, frustrate, prevent
            or nullify the Merger, the Merger Agreement or any of the
            other transactions contemplated by the Merger Agreement or
            change in any manner the voting rights of any class of
            capital stock of Coherent; (c) the Stockholder agrees not to
            (i) sell, transfer, pledge, assign or otherwise dispose of
            (including by gift) (collectively, "Transfer"), or enter
            into any contract, option or other arrangement (including
            any profit-sharing arrangement) with respect to the Transfer
            of the Subject Shares to any person or (ii) enter into any
            voting arrangement, whether by proxy, voting agreement or
            otherwise, in relation to the Subject Shares, and agrees not
            to commit or agree to take any of the foregoing actions; and
            (d) the Stockholder agrees to use all reasonable efforts to
            take, or cause to be taken, all actions, and to do, or cause
            to be done, and to assist and cooperate with Tellabs in
            doing, all things necessary, proper or advisable to
            consummate and make effective, in the most expeditious
            manner practicable, the Merger and the other transactions
            contemplated by the Merger Agreement.

            The obligations of the Stockholders under the Stockholder
            Agreements terminate upon the earlier of the termination of
            the Merger Agreement or the effective time of the Merger,
            except that if the Merger Agreement is terminated pursuant
            to certain sections of the Merger Agreement that may result
            in a termination fee being paid to Tellabs by Coherent after
            the date of such termination pursuant to the Merger
            Agreement, the Stockholder Agreements shall not terminate
            until 60 days following the termination of the Merger
            Agreement.

<PAGE>
<PAGE> 12

            A copy of the Stockholder Agreement entered into between
            Tellabs and Safeguard and the form of Stockholder Agreement
            entered into between Tellabs and each such other Stockholder
            are filed as Exhibits 2 and 3 hereto, respectively, and the
            description of the Stockholder Agreements contained herein
            is qualified in its entirety by reference to such exhibits,
            which are incorporated herein by reference.

Item 5.		Interest in Securities of the Issuer.
            ------------------------------------
            (a) - (c)  By reason of the Stockholder Agreements, Tellabs
                       may be deemed to be the beneficial owner of, in
                       the aggregate, 6,031,391 shares (the "Shares") of
                       Coherent Common Stock and may be deemed to have
                       shared power to vote or direct the vote of the
                       Shares or shared power to dispose or direct the
                       disposition of the Shares.  The Shares represent
                       approximately 38.9% of the outstanding shares of
                       Coherent Common Stock, based upon the number of
                       shares outstanding as of February 12, 1998.  By
                       virtue of the limited nature of the Stockholder
                       Agreements, Tellabs expressly disclaims
                       beneficial ownership of the Shares.  Except as
                       described in this Schedule 13D, neither Tellabs
                       nor, to the best knowledge of Tellabs, any of the
                       persons listed in Item 2 above beneficially owns
                       any shares of Coherent Common Stock.  Except as
                       described in this Schedule 13D, neither Tellabs
                       nor, to the best of its knowledge, any of the
                       persons listed in Item 2 above has effected any
                       transactions in Coherent Common Stock during the
                       past 60 days.

            (d)        Not applicable.

            (e)        Not applicable

<PAGE>
<PAGE> 13

Item 6.     Contracts, Arrangements, Understanding or Relationships with
            Respect to Securities of the Issuer.
            -----------------------------------
            As described in Item 4, Tellabs presently anticipates that
            it will acquire the entire equity interest in Coherent
            pursuant to the Merger Agreement.

            Other than the Merger Agreement and the Stockholder
            Agreements described in Item 4 and attached as Exhibits to
            this Statement, to the best knowledge of Tellabs, there are
            no contracts, arrangements, understandings or relationships
            (legal or otherwise) between the persons listed in Item 2 of
            this Statement and any person with respect to Coherent
            Common Stock.

Item 7.		Material to be Filed as Exhibits.
            --------------------------------
            1   Agreement and Plan of Merger dated as of February 16,
                1998 among Tellabs, Inc., Cardinal Merger Co. and
                Coherent Communications Systems Corporation
                (Incorporated by reference to Exhibit 2.1 of Tellabs,
                Inc.'s Current Report on Form 8-K (filed on February
                20, 1998)).

            2   Safeguard Stockholder Agreement dated as of February
                16, 1998 between Tellabs, Inc. and Safeguard
                Scientifics, Inc.

            3   Form of Stockholder Agreement dated as of February 16,
                1998 entered into between Tellabs, Inc. and certain
                stockholders of Coherent Communications Systems
                Corporation (including a schedule listing each such
                stockholder and the number of shares of common stock of
                Coherent Communications Systems Corporation owned by
                such stockholder as set forth in the Stockholder
                Agreement entered into by such stockholder).

<PAGE>
<PAGE> 14

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true,
complete and correct.


                               TELLABS, INC.


Dated:  February 26, 1998      By:  /s/ Carol Coghlan Gavin
                                   ------------------------------------
                                   Carol Coghlan Gavin
                                   Secretary

<PAGE>
<PAGE> 15

EXHIBIT INDEX
- -------------

Exhibit No.	Description
- -----------------------
1   Agreement and Plan of Merger dated as of February 16, 1998 among
    Tellabs, Inc., Cardinal Merger Co. and Coherent Communications
    Systems Corporation (Incorporated by reference to Exhibit 2.1 of
    Tellabs, Inc.'s Current Report on Form 8-K (filed on February 20,
    1998)).

2   Safeguard Stockholder Agreement dated as of February 16, 1998
    between Tellabs, Inc. and Safeguard Scientifics, Inc.

3   Form of Stockholder Agreement dated as of February 16, 1998 entered
    into between Tellabs, Inc. and certain stockholders of Coherent
    Communications Systems Corporation (including a schedule listing
    each such stockholder and the number of shares of common stock of
    Coherent Communications Systems Corporation owned by such
    stockholder as set forth in the Stockholder Agreement entered into
    by such stockholder).



<PAGE> 1
                                                              Exhibit 2
                    SAFEGUARD STOCKHOLDER AGREEMENT


STOCKHOLDER AGREEMENT, dated as of February 16, 1998 (this "Agreement")
by the undersigned stockholder (the "Stockholder") of Coherent
Communications Systems Corporation, a Delaware corporation (the
"Company"), for the benefit of Tellabs, Inc., a Delaware corporation
("Parent").

WHEREAS, Parent, Cardinal Merger Co., a Delaware corporation and a
wholly-owned subsidiary of Parent ("Sub"), and the Company are entering
into an Agreement and Plan of Merger, dated as of February 16, 1998 (the
"Merger Agreement"), whereby, upon the terms and subject to the
conditions set forth in the Merger Agreement, each issued and
outstanding share of the Common Stock, par value $.01 per share, of the
Company ("Company Common Stock") not owned directly or indirectly by
Parent or the Company, will be converted into shares of Common Stock,
par value $.01 per share, of Parent ("Parent Common Stock");

WHEREAS, stockholder owns 4,843,342 shares of Company Common Stock (such
shares of Company Common Stock, together with any other shares of
capital stock of the Company acquired by such Stockholder after the date
hereof and during the term of this Agreement, being collectively
referred to herein as the "Subject Shares"); and

WHEREAS, as a condition to its willingness to enter into the Merger
Agreement, Parent has required that the Stockholder agree, and in order
to induce Parent to enter into the Merger Agreement the Stockholder has
agreed, to enter into this Agreement.

NOW, THEREFORE, in consideration of the promises and the mutual
covenants and agreements set forth herein, the Stockholder agrees as
follows:

1.	Capitalized Terms.
    -----------------
    Capitalized terms used in this Agreement that are not defined herein
    shall have such meanings as set forth in the Merger Agreement.

2.	Covenants of Stockholder.
    ------------------------
    Until the termination of this Agreement in accordance with Section
    5, Stockholder agrees as follows:

<PAGE>
<PAGE> 2

    (a) At the Stockholders Meeting (or at any adjournment thereof) or
        in any other circumstances upon which a vote, consent or other
        approval with respect to the Merger or the Merger Agreement is
        sought, the Stockholder shall vote (or cause to be voted) the
        Subject Shares in favor of the Merger, the adoption of the
        Merger Agreement and the approval of the terms thereof and each
        of the other transactions contemplated by the Merger Agreement.

    (b) At any meeting of stockholders of the Company or at any
        adjournment thereof or in any other circumstances upon which the
        Stockholder's vote, consent or other approval is sought, the
        Stockholder shall vote (or cause to be voted) the Subject Shares
        against (i) any merger agreement or merger (other than the
        Merger Agreement and the Merger), consolidation, combination,
        sale of substantial assets, reorganization, recapitalization,
        dissolution, liquidation or winding up of or by the Company or
        any subsidiary thereof or any other Takeover Proposal or (ii)
        any amendment of the Company's Certificate of Incorporation or
        Bylaws or other proposal or transaction involving the Company or
        any of its subsidiaries, which amendment or other proposal or
        transaction would in any manner impede, frustrate, prevent or
        nullify the Merger, the Merger Agreement or any of the other
        transactions contemplated by the Merger Agreement or change in
        any manner the voting rights of any class of capital stock of
        the Company.  The Stockholder further agrees not to commit or
        agree to take any action inconsistent with the foregoing.

    (c) The Stockholder agrees not to (i) sell, transfer, pledge, assign
        or otherwise dispose of (including by gift) (collectively,
        "Transfer"), or enter into any contract, option or other
        arrangement (including any profit-sharing arrangement) with
        respect to the Transfer of the Subject Shares to any person or
        (ii) enter into any voting arrangement, whether by proxy, voting
        agreement or otherwise, in relation to the Subject Shares, and
        agrees not to commit or agree to take any of the foregoing
        actions.

<PAGE>
<PAGE> 3

    (d) The Stockholder shall not, nor shall the Stockholder permit any
        affiliate, director, officer, employee, investment banker,
        attorney or other advisor or representative of the Stockholder
        to, (i) directly or indirectly solicit, initiate or encourage
        the submission of, any Takeover Proposal or (ii) directly or
        indirectly participate in any discussions or negotiations
        regarding, or furnish to any person any information with respect
        to, or take any other action to facilitate any inquiries or the
        making of any proposal that constitutes or may reasonably be
        expected to lead to, any Takeover Proposal.

    (e) The Stockholder shall use all reasonable efforts to take, or
        cause to be taken, all actions, and to do, or cause to be done,
        and to assist and cooperate with Parent in doing, all things
        necessary, proper or advisable to consummate and make effective,
        in the most expeditious manner practicable, the Merger and the
        other transactions contemplated by the Merger Agreement.

    Stockholder makes the covenants and agreements contained in this
    Section 2 solely in Stockholder's capacity as a stockholder of the
    Company and nothing contained in this Agreement shall limit the
    ability of Stockholder, to the extent Stockholder is a director of
    the Company, to discharge Stockholder's fiduciary duties as a
    director of the Company under applicable law.

3.  The Subject Shares.
    ------------------
    The Stockholder represents and warrants to Parent that (i) the
    Stockholder is the record and beneficial owner of, and has good and
    marketable title to, the Subject Shares, (ii) the Stockholder does
    not own, of record or beneficially, any shares of capital stock of
    the Company other than the Subject Shares and (iii) the Stockholder
    has the sole right to vote, and the sole power of disposition with
    respect to, the Subject Shares, and none of the Subject Shares is
    subject to any voting trust, proxy or other agreement, arrangement
    or restriction with respect to the voting or disposition of such
    Subject Shares, except as contemplated by this Agreement.

<PAGE>
<PAGE> 4

4.  Affiliates Letter.
    -----------------
    Stockholder agrees to execute and deliver on a timely basis an
    Affiliate Letter in the form of Exhibit A to the Merger Agreement,
    when and if requested by Parent.

5.	Termination.
    -----------
    The obligations of the Stockholder hereunder shall terminate upon
    the earlier of the termination of the Merger Agreement pursuant to
    Section 8.1 thereof or the Effective Time; provided, however, that
    if the Merger Agreement is terminated pursuant to Sections 8.1(d),
    8.1(e) or 8.1(f) of the Merger Agreement, this Agreement shall not
    terminate until 60 days following the termination of the Merger
    Agreement.

6.	Further Assurances.
    ------------------
    Stockholder will, from time to time, execute and deliver, or cause
    to be executed and delivered, such additional or further consents,
    documents and other instruments as Parent may reasonably request for
    the purpose of effectively carrying out the transactions
    contemplated by this Agreement.

7.	Successors, Assigns and Transferees Bound.
    -----------------------------------------
    Any successor, assignee or transferee (including a successor,
    assignee or transferee as a result of the death of the Stockholder,
    such as an executor or heir) shall be bound by the terms hereof, and
    the Stockholder shall take any and all actions necessary to obtain
    the written confirmation from such successor, assignee or transferee
    that it is bound by the terms hereof.

<PAGE>
<PAGE> 5

8.  Remedies.
    --------
    The Stockholder acknowledges that money damages would be both
    incalculable and an insufficient remedy for any breach of this
    Agreement by it, and that any such breach would cause Parent
    irreparable harm.  Accordingly, the Stockholder agrees that in the
    event of any breach or threatened breach of this Agreement, Parent,
    in addition to any other remedies at law or in equity it may have,
    shall be entitled, without the requirement of posting a bond or
    other security, to equitable relief, including injunctive relief and
    specific performance.

9.  Severability.
    ------------
    The invalidity or unenforceability of any provision of this
    Agreement in any jurisdiction shall not affect the validity or
    enforceability of any other provision of this Agreement in such
    jurisdiction, or the validity or enforceability of any provision of
    this Agreement in any other jurisdiction.  If in the opinion of
    Parent's independent accountants, any provision hereof would cause
    the Merger to be ineligible for "pooling of interest" accounting
    treatment, it shall be deemed to be ineffective and inapplicable.

10.	Amendment.
    ---------
    This Agreement may be amended only by means of a written instrument
    executed and delivered by both the Stockholder and Parent.

11.	Governing Law.
    -------------
    This Agreement shall be governed by, and construed in accordance in
    accordance with, the laws of the State of Delaware, regardless of
    the laws that might otherwise govern under applicable principles of
    conflicts of laws thereof.

12.	Counterparts.
    ------------
    For the convenience of the parties, this Agreement may be executed
    in one or more counterparts, each of which shall be deemed an
    original, but all of which together shall constitute one and the
    same instrument.

<PAGE>
<PAGE> 6

13. Termination of Loan Agreement.
    -----------------------------
    The loan agreement between the Stockholder and the Company
    referenced in the Company's Proxy Statement for its 1997 Annual
    Meeting of Stockholders has been terminated and is of no force or
    effect and no amounts are owing to the Stockholder or the Company
    thereunder.

14.	Termination of  Administrative Services  Agreement.
    --------------------------------------------------
    The Stockholder agrees to take all necessary action to cause the
    Administrative Services Agreement dated as of May 7, 1997 between
    the Company and the Stockholder  (the "Services Agreement") to be
    terminated effective immediately before the Effective Time  (or such
    later time thereafter as may be requested by Parent, not to exceed
    one hundred eighty (180) days following the Effective Time) on terms
    that are reasonably satisfactory to Parent, which terms shall
    include that the Company shall have no continuing obligations under
    the such agreements following such termination and that the
    Stockholder shall not be entitled to receive any consideration  in
    connection with such termination other than a termination fee,
    payable by the Company at the time of such termination, equal to the
    Services Fee (as defined in Section 3 of the Services Agreement)
    payable with respect to the period commencing on the date of such
    termination and ending on December 31, 1998.  The Stockholder
    represents to Parent that a true and complete copy of such agreement
    has been delivered to Parent and that all amounts due to Stockholder
    from the Company thereunder up to and including January 1, 1998 have
    been paid in full.

<PAGE>
<PAGE> 7

SAFEGUARD SCIENTIFICS, INC.


By:     /s/ James A. Ounsworth
        ------------------------------------------
Name:   James A. Ounsworth
Title:  Senior Vice President,
		General Counsel and Secretary

Accepted and Agreed to
as of the date noted above:

TELLABS, INC.


By:     /s/ Michael J. Birck
        ------------------------------------------
Name:   Michael J. Birck 
Title:	President and Chief Executive Officer



<PAGE> 1

                                                               Exhibit 3
                     FORM OF STOCKHOLDER AGREEMENT


STOCKHOLDER AGREEMENT, dated as of February 16, 1998 (this "Agreement")
by the undersigned stockholder (the "Stockholder") of Coherent
Communications Systems Corporation, a Delaware corporation (the
"Company"), for the benefit of Tellabs, Inc., a Delaware corporation
("Parent").

WHEREAS, Parent, Cardinal Merger Co., a Delaware corporation and a
wholly-owned subsidiary of Parent ("Sub"), and the Company are entering
into an Agreement and Plan of Merger, dated as of February 16, 1998 (the
"Merger Agreement"), whereby, upon the terms and subject to the
conditions set forth in the Merger Agreement, each issued and
outstanding share of the Common Stock, par value $.01 per share, of the
Company ("Company Common Stock") not owned directly or indirectly by
Parent or the Company, will be converted into shares of Common Stock,
par value $.01 per share, of Parent ("Parent Common Stock");

WHEREAS, stockholder owns [__________________]* shares of Company Common
Stock (such shares of Company Common Stock, together with any other
shares of capital stock of the Company acquired by such Stockholder
after the date hereof and during the term of this Agreement, being
collectively referred to herein as the "Subject Shares"); and

WHEREAS, as a condition to its willingness to enter into the Merger
Agreement, Parent has required that the Stockholder agree, and in order
to induce Parent to enter into the Merger Agreement the Stockholder has
agreed, to enter into this Agreement.

NOW, THEREFORE, in consideration of the promises and the mutual
covenants and agreements set forth herein, the Stockholder agrees as
follows:

1.	Capitalized Terms.
    -----------------
    Capitalized terms used in this Agreement that are not defined herein
    shall have such meanings as set forth in the Merger Agreement.

<PAGE>
<PAGE> 2

2.	Covenants of Stockholder.
    ------------------------
    Until the termination of this Agreement in accordance with Section
    5, Stockholder agrees as follows:

    (a) At the Stockholders Meeting (or at any adjournment thereof) or
        in any other circumstances upon which a vote, consent or other
        approval with respect to the Merger or the Merger Agreement is
        sought, the Stockholder shall vote (or cause to be voted) the
        Subject Shares in favor of the Merger, the adoption of the
        Merger Agreement and the approval of the terms thereof and each
        of the other transactions contemplated by the Merger Agreement.

    (b) At any meeting of stockholders of the Company or at any
        adjournment thereof or in any other circumstances upon which the
        Stockholder's vote, consent or other approval is sought, the
        Stockholder shall vote (or cause to be voted) the Subject Shares
        against (i) any merger agreement or merger (other than the
        Merger Agreement and the Merger), consolidation, combination,
        sale of substantial assets, reorganization, recapitalization,
        dissolution, liquidation or winding up of or by the Company or
        any subsidiary thereof or any other Takeover Proposal or (ii)
        any amendment of the Company's Certificate of Incorporation or
        Bylaws or other proposal or transaction involving the Company or
        any of its subsidiaries, which amendment or other proposal or
        transaction would in any manner impede, frustrate, prevent or
        nullify the Merger, the Merger Agreement or any of the other
        transactions contemplated by the Merger Agreement or change in
        any manner the voting rights of any class of capital stock of
        the Company.  The Stockholder further agrees not to commit or
        agree to take any action inconsistent with the foregoing.

    (c) The Stockholder agrees not to (i) sell, transfer, pledge,
        assign or otherwise dispose of (including by gift)
        (collectively, "Transfer"), or enter into any contract, option
        or other arrangement (including any profit-sharing arrangement)
        with respect to the Transfer of the Subject Shares to any person
        or (ii) enter into any voting arrangement, whether by proxy,
        voting agreement or otherwise, in relation to the Subject
        Shares, and agrees not to commit or agree to take any of the
        foregoing actions.

<PAGE>
<PAGE> 3

    (d) The Stockholder shall not, nor shall the Stockholder permit any
        affiliate, director, officer, employee, investment banker,
        attorney or other advisor or representative of the Stockholder
        to, (i) directly or indirectly solicit, initiate or encourage
        the submission of, any Takeover Proposal or (ii) directly or
        indirectly participate in any discussions or negotiations
        regarding, or furnish to any person any information with respect
        to, or take any other action to facilitate any inquiries or the
        making of any proposal that constitutes or may reasonably be
        expected to lead to, any Takeover Proposal.

    (e) The Stockholder shall use all reasonable efforts to take, or
        cause to be taken, all actions, and to do, or cause to be done,
        and to assist and cooperate with Parent in doing, all things
        necessary, proper or advisable to consummate and make effective,
        in the most expeditious manner practicable, the Merger and the
        other transactions contemplated by the Merger Agreement.

    Stockholder makes the covenants and agreements contained in this
    Agreement solely in Stockholder's capacity as a stockholder of the
    Company and nothing contained in this Agreement shall limit the
    ability of Stockholder, to the extent Stockholder is a director of
    the Company, to discharge Stockholder's fiduciary duties as a
    director of the Company under applicable law.

3.	The Subject Shares.
    ------------------
    The Stockholder represents and warrants to Parent that (i) the
    Stockholder is the record and beneficial owner of, and has good and
    marketable title to, the Subject Shares, (ii) the Stockholder does
    not own, of record or beneficially, any shares of capital stock of
    the Company other than the Subject Shares and (iii) the Stockholder
    has the sole right to vote, and the sole power of disposition with
    respect to, the Subject Shares, and none of the Subject Shares is
    subject to any voting trust, proxy or other agreement, arrangement
    or restriction with respect to the voting or disposition of such
    Subject Shares, except as contemplated by this Agreement.

4.	Affiliates Letter.
    -----------------
    Stockholder agrees to execute and deliver on a timely basis an
    Affiliate Letter in the form of Exhibit A to the Merger Agreement,
    when and if requested by Parent.

<PAGE>
<PAGE> 4

5.	Termination.
    -----------
    The obligations of the Stockholder hereunder shall terminate upon
    the earlier of the termination of the Merger Agreement pursuant to
    Section 8.1 thereof or the Effective Time; provided, however, that
    if the Merger Agreement is terminated pursuant to Sections 8.1(d),
    8.1(e) or 8.1(f) of the Merger Agreement, this Agreement shall not
    terminate until 60 days following the termination of the Merger
    Agreement.

6.	Further Assurances.
    ------------------
    Stockholder will, from time to time, execute and deliver, or cause
    to be executed and delivered, such additional or further consents,
    documents and other instruments as Parent may reasonably request for
    the purpose of effectively carrying out the transactions
    contemplated by this Agreement.

7.	Successors, Assigns and Transferees Bound.
    -----------------------------------------
    Any successor, assignee or transferee (including a successor,
    assignee or transferee as a result of the death of the Stockholder,
    such as an executor or heir) shall be bound by the terms hereof, and
    the Stockholder shall take any and all actions necessary to obtain
    the written confirmation from such successor, assignee or transferee
    that it is bound by the terms hereof.

8.	Remedies.
    --------
    The Stockholder acknowledges that money damages would be both
    incalculable and an insufficient remedy for any breach of this
    Agreement by it, and that any such breach would cause Parent
    irreparable harm.  Accordingly, the Stockholder agrees that in the
    event of any breach or threatened breach of this Agreement, Parent,
    in addition to any other remedies at law or in equity it may have,
    shall be entitled, without the requirement of posting a bond or
    other security, to equitable relief, including injunctive relief and
    specific performance.

<PAGE>
<PAGE> 5

9.  Severability.
    ------------
    The invalidity or unenforceability of any provision of this
    Agreement in any jurisdiction shall not affect the validity or
    enforceability of any other provision of this Agreement in such
    jurisdiction, or the validity or enforceability of any provision of
    this Agreement in any other jurisdiction.  If in the opinion of
    Parent's independent accountants, any provision hereof would cause
    the Merger to be ineligible for "pooling of interest" accounting
    treatment, it shall be deemed to be ineffective and inapplicable.

10.	Amendment.
    ---------
    This Agreement may be amended only by means of a written instrument
    executed and delivered by both the Stockholder and Parent.

11.	Governing Law.
    -------------
    This Agreement shall be governed by, and construed in accordance in
    accordance with, the laws of the State of Delaware, regardless of
    the laws that might otherwise govern under applicable principles of
    conflicts of laws thereof.

12.	Counterparts.
    ------------
    For the convenience of the parties, this Agreement may be executed
    in one or more counterparts, each of which shall be deemed an
    original, but all of which together shall constitute one and the
    same instrument.

<PAGE>
<PAGE> 6



                                    [_______________________________]*
                                     Name:

Accepted and Agreed to
as of the date noted above:

TELLABS, INC.


By:     /s/ Michael J. Birck
        -------------------------------------
Name:   Michael J. Birck 
Title:	President and Chief Executive Officer

* See attached schedule.

<PAGE>
<PAGE> 7

                                Schedule
                                --------

List of Parties to the Stockholder Agreements and Shares Held as
Described in Exhibit 3 to this Schedule 13D

            Stockholder               Shares Currently Owned(1)
            -----------               ----------------------

            Lawrence J. Gallick                 8,868

            Daniel L. McGinnis                824,421

            Warren V. Musser                  230,022

            Charles A. Root                   124,738

            Charles Skibo                           0

            Ernst Volgenau                          0

(1) The number of shares is as reported by each stockholder in his
    respective Stockholder Agreement.
 




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