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                                                                  EXHIBIT #10.16
                           HARMONIC LIGHTWAVES, INC.

                          LOAN MODIFICATION AGREEMENT

     This Loan Modification Agreement is entered into as of September 13, 1996,
by and between Harmonic Lightwaves, Inc. (the "Borrower") whose address is 549
Baltic Way, Sunnyvale, CA 94089, and Silicon Valley Bank (the "Lender") whose
address is 3003 Tasman Drive, Santa Clara, CA 95054.

1.   DESCRIPTION OF EXISTING INDEBTEDNESS Among other indebtedness which may be
owing by Borrower to Lender, Borrower is indebted to Lender pursuant to, among
other documents, a Promissory Note, dated August 26, 1993, in the original
principal amount of One Million and 00/100 Dollars ($1,000,000.00) (the
"Note").  The Note has been modified pursuant to Loan Modification Agreements
dated May 15, 1994, August 15, 1994, October 5, 1994 and September 14, 1995,
pursuant to which, among other things, the principal amount of the Note was
increased to Five Million and 00/100 Dollars ($5,000,000.00). The Note,
together with other promissory notes from Borrower to Lender, is governed by
the terms of a Business Loan Agreement, dated August 26, 1993, between Borrower
and Lender, as such agreement may be amended from time to time (the "Loan
Agreement").  Defined terms used but not otherwise defined herein, shall have
the same meanings as in the Loan Agreement.

Hereinafter, all indebtedness owing by Borrower to Lender shall be referred to
as the "Indebtedness."

2.   DESCRIPTION OF COLLATERAL In connection with the repayment of the
Indebtedness, Borrower has agreed not to further encumber or Pledge any of its
assets pursuant to a Negative Pledge Agreement, being executed concurrently
herewith.

Hereinafter, the above-described security documents, together with all other
documents securing payment of the Indebtedness shall be referred to as the
"Security Documents." Hereinafter, the Security Documents, together with all
other documents evidencing or securing the Indebtedness shall be referred to as
the "Existing Loan Documents."

3.   DESCRIPTION OF CHANGE IN TERMS.

     A.       Modification(s) to Note

              1.      Payable in one payment of all outstanding principal plus
                      all accrued unpaid interest on September 12, 1997 (the
                      "Maturity Date").  In addition, Borrower will pay regular
                      monthly payments of all accrued unpaid interest due as of
                      each payment date beginning October 12, 1996, and all
                      subsequent interest payments are due on the same day of
                      each month thereafter.

              2.      The principal amount of the Note is hereby increased to
                      Ten Million and 00/100 Dollars ($10,000,000.00).

              3.      The interest rate to be applied to the unpaid principal
                      balance of the Note shall be at a rate equal to Lender's
                      Index (as described in the Note) or a LIBOR Interest Rate
                      equal to 2.000 percentage points in excess of the LIBOR
                      Base Rate as described in the LIBOR Supplement to Loan
                      Modification Agreement, attached hereto.

              4.      The requirement for Borrower to maintain a zero balance
                      under the Note is hereby deleted in its entirety.
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     B.       Modification(s) to Loan Agreement.

              1.      The following paragraphs are hereby incorporated into the
                      Loan Agreement:

                      Accounts Receivable and Accounts Payable.  At such time
                      as outstandings under the line of credit facility exceed
                      Five Million and 00/100 Dollars ($5,000,000.00), Borrower
                      shall provide to Lender, not later than twenty (20) days
                      after the end of each month with a Borrowing Base
                      Certificate and aged lists of accounts receivable and
                      accounts payable.  Semi-annual accounts receivable
                      audits to be performed by Lender's agent.  Borrower's
                      deposit account will be debited for the audit expense and
                      a notification will be mailed to Borrower.

                      Borrowing Base Formula.  At such time as outstandings
                      under the line of credit facility exceed Five Million and
                      00/100 Dollars ($5,000,000.00), funds shall be advanced
                      under the line of credit facility according to a
                      borrowing base formula, as determined by Lender on a
                      monthly basis, defined as follows: the lesser of (a)
                      $10,000,000.00 minus the face amount of outstanding
                      Letters of Credit (including drawn but unreimbursed
                      Letters of Credit) minus the Foreign Exchange Reserve (as
                      defined herein) or (b) the sum of (i) eighty percent
                      (80%) of eligible domestic accounts receivable plus (ii)
                      eighty percent (80%) of pre-approved foreign accounts
                      receivable plus (iii) one hundred percent (100%) of
                      accounts receivable backed by letters of credit, provided
                      such letters of credit are issued by a bank acceptable to
                      Lender and in form and substance acceptable to Lender,
                      minus (iv) the face amount of outstanding Letters of
                      Credit (including drawn but unreimbursed Letters of
                      Credit) minus (v) the Foreign Exchange Reserve.  Eligible
                      domestic accounts receivable shall include, but not be
                      limited to, those accounts outstanding less than 90 days
                      from the date of invoice, excluding foreign, government,
                      contra, and intercompany accounts; and exclude accounts
                      wherein 50% or more of the account is outstanding more
                      than 90 days from the date of invoice.  Foreign accounts
                      may be eligible if approved by Lender on a case-by-case
                      basis.  Any account which alone exceeds 25% of total
                      accounts will be ineligible to the extent said account
                      exceeds 25% of total accounts.  Also exclude any credit
                      balances which are aged past 90 days.  Also ineligible
                      are any accounts which Lender in its sole judgment
                      excludes for valid credit reasons.

                      Foreign Exchange Sublimit.  Subject to the terms of this
                      Agreement, as amended from time to time, Borrower may
                      utilize up to $2,000,000.00 for spot and future foreign
                      exchange contracts (the "Exchange Contracts").  Borrower
                      shall not request an Exchange Contract at any time it is
                      not in compliance with any of the terms of this
                      Agreement.  All Exchange Contracts must provide for
                      delivery of settlement on or before the Maturity Date.
                      The limit available at any time shall be reduced by the
                      following amounts (the "Foreign Exchange Reserve") on
                      each day (the "Determination Date"): (i) on all
                      outstanding Exchange Contracts on which delivery is to be
                      effected or settlement allowed more than two business
                      days from the Determination Date, 10% of the gross amount
                      of the Exchange Contracts; plus (ii) on all outstanding
                      Exchange Contracts on which delivery is to be effected or
                      settlement allowed within two business days after the
                      Determination Date, 100% of the gross amount of the
                      Exchange Contracts.  In lieu of the Foreign Exchange
                      Reserve for 100% of the gross amount of any Exchange
                      Contract, the Borrower may request that Lender debit
                      Borrower's bank account with Lender for such amount,
                      provided Borrower has immediately available funds in such
                      amounts in its bank account.





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                      Lender may, in its discretion, terminate the Exchange
                      Contracts at any time (a) that an Event of Default occurs
                      or (b) that there is not sufficient availability under
                      the Note and Borrower does not have available funds in
                      its bank account to satisfy the Foreign Exchange Reserve.
                      If Lender terminates the Exchange Contracts, and without
                      limitation of the FX Indemnity Provisions (as referred to
                      below), Borrower agrees to reimburse Lender for any and
                      all fees, costs and expenses relating thereto or arising
                      in connection therewith.

                      Borrower shall not permit the total gross amount of all
                      Exchange Contracts on which delivery is to be effected
                      and settlement allowed in any two business day period to
                      be more than $2,000,000.00 nor shall Borrower permit the
                      total gross amount of all Exchange Contracts to which
                      Borrower is a party, outstanding at any one time, to
                      exceed $2,000,000.00.

                      Borrower shall execute all standard form applications and
                      agreements of Lender in connection with the Exchange
                      Contracts, and without limiting any of the terms of such
                      applications and agreements, Borrower will pay all
                      standard fees and charges of Lender in connection with
                      the Exchange Contracts.

                      Without limiting any of the other terms of this Agreement
                      or any such standard form applications and agreement of
                      Lender, Borrower agrees to indemnify Lender and hold
                      it harmless, from and against any and all claims, debts,
                      liabilities, demands, obligations, actions, costs and
                      expenses (including, without limitation, attorneys' fees
                      of counsel of Lender's choice), of every nature and
                      description which it may sustain or incur, based upon,
                      arising out of, or in any way relating to any of the
                      Exchange Contracts or any transactions relating thereto
                      or contemplated thereby (collectively referred to as the
                      "FX Indemnity Provisions").

              2.      The paragraph entitled "Letter of Credit Sublimit" is
                      hereby amended, in its entirety, to read as follows:

                      Letters of Credit.  Subject to the terms and conditions
                      of this Agreement, Lender agrees to issue or cause to be
                      issued letters of credit for the account of Borrower in
                      an aggregate face amount not to exceed (i) the lesser of
                      the $10,000,000.00 or the Borrowing Base Formula minus
                      (ii) the then outstanding principal balance of the Note
                      provided that the face amount of outstanding Letters of
                      Credit (including drawn but unreimbursed Letters of
                      Credit) shall not in any case exceed Ten Million Dollars
                      ($10,000,000.00). Each such letter of credit shall have
                      an expiry date no later than one hundred eighty (180)
                      days after the Maturity Date of the Note. provided that
                      Borrower's letter of credit reimbursement obligation
                      shall be secured by cash on terms acceptable to Lender at
                      any time after the Maturity Date if the term of the
                      Agreement is not extended by Lender.  All such letters of
                      credit shall be, in form and substance, acceptable to
                      Lender in its sole discretion and shall be subject to the
                      terms and conditions of Lender's form of application and
                      letter of credit agreement.

                      Borrower shall indemnify, defend, protect and hold Lender
                      harmless from any loss, cost, expense or liability,
                      including, without limitation, reasonable attorneys'
                      fees, arising out of or in connection with any letters of
                      credit.





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                      Letter of credit Reimbursement: Reserve.  Borrower may
                      request that Lender issue a letter of credit payable in a
                      currency other than United States Dollars.  If a demand
                      for payment is made under any such letter of credit,
                      Lender shall treat such demand as an advance to Borrower
                      of the equivalent of the amount thereof (plus cable
                      charges) in United States currency at the then prevailing
                      rate of exchange in San Francisco, California, for sales
                      of that other currency for cable transfer to the country
                      of which it is the currency.

                      Upon the issuance of any letter of credit payable in a
                      currency other than United States Dollars, Lender shall
                      create a reserve (the "Letter of Credit Reserve") under
                      the Committed Line for letters of credit against
                      fluctuations in currency exchange rates, in an amount
                      equal to ten percent (10%) of the face amount of such
                      letter of credit.  The amount of such reserve may be
                      amended by Lender from time to time to account for
                      fluctuations in the exchange rate.  The availability of
                      funds under the Note shall be reduced by the amount of
                      such reserve for so long as such letter of credit remains
                      outstanding.

              3.      The paragraph entitled "Financial Covenants" is hereby
                      amended to read in its entirety as follows:

                      Borrower shall maintain on a quarterly basis, a minimum
                      quick ratio of 2.00 to 1.0; a minimum tangible net worth
                      of $35,000,000.00, plus seventy five percent (75%) of
                      quarterly profits after taxes (exclusive of losses),
                      beginning as of October 1, 1996, plus one hundred percent
                      (100%) of net new equity; and a maximum total debt minus
                      subordinated debt to tangible net worth plus subordinated
                      debt ratio of 1.00 to 1.00. Additionally, Borrower shall
                      achieve profitability on a quarterly basis with allowance
                      for one quarterly loss, provided such loss does not
                      exceed $500,000.00.

4.   CONSISTENT CHANGES.  The Existing Loan Documents are hereby amended
wherever necessary to reflect the changes described above.

5.   PAYMENT OF LOAN FEES.  Borrower shall pay to Lender a fee in the amount of
Fifteen Thousand and 00/100 Dollars ($15,000.00) (the "Loan Fee") plus all
out-of-pocket expenses.

6.   NO DEFENSES OF BORROWER.  Borrower (and each guarantor and pledgor signing
below) agrees that, as of this date, it has no defenses against the obligations
to pay any amounts under the Indebtedness.

7.   CONTINUING VALIDITY.  Borrower (and each guarantor and pledgor signing
below) understands and agrees that in modifying the existing Indebtedness,
Lender is relying upon Borrower's representations, warranties, and agreements,
as set forth in the Existing Loan Documents.  Except as expressly modified
pursuant to this Loan Modification Agreement, the terms of the Existing Loan
Documents remain unchanged and in full force and effect.  Lender's agreement to
modifications to the existing Indebtedness pursuant to this Loan Modification
Agreement in no way shall obligate Lender to make any future modifications to
the Indebtedness.  Nothing in this Loan Modification Agreement shall constitute
a satisfaction of the Indebtedness.  It is the intention of Lender and Borrower
to retain as liable parties all makers and endorsers of Existing Loan Documents,
unless the party is expressly released by Lender in writing.  No maker, 
endorser, or guarantor will be released by virtue of this Loan Modification 
Agreement.  The terms of this Paragraph apply not only to this Loan Modification
Agreement, but also to all subsequent loan modification agreements.

8.   CONDITIONS.  The effectiveness of this Loan Modification Agreement is
conditioned upon payment of the Loan Fee.





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     This Loan Modification Agreement is executed as of the date first written
above.

BORROWER:                                        LENDER:

HARMONIC LIGHTWAVES, INC.                        SILICON VALLEY BANK

By:  /s/Robin N. Dickson                         By:    /s/Peter A. Kidder    
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Name:   Robin N. Dickson                         Name:     Peter A. Kidder    
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Title:  Chief Financial Officer                  Title:    Vice President     
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