Filing Pursuant to Rule 424(b)(3)
                                            Registration Statement No. 333-48536


                PROSPECTUS SUPPLEMENT NO. 11 DATED MAY 11, 2001
                     TO PROSPECTUS DATED JANUARY 22, 2001

                       TERAYON COMMUNICATION SYSTEMS, INC.

                                 $500,000,000

      of 5% Convertible Subordinated Notes Due 2007 and 5,951,673 Shares of
               Common Stock Issuable Upon Conversion of the Notes

Please read this prospectus supplement in conjunction with the prospectus dated
January 22, 2001 (the "Prospectus"). The table on pages 21 through 24 of the
Prospectus setting forth information concerning the selling holders, the
prospectus supplement no. 1 dated February 9, 2001, the prospectus supplement
no. 2 dated February 16, 2001, the prospectus supplement No. 3 dated February
20, 2001, the prospectus supplement no. 4 dated February 23, 2001, the
prospectus supplement no. 5 dated March 2, 2001, the prospectus supplement No. 6
dated March 16, 2001, the prospectus supplement no. 7 dated March 16, 2001, the
prospectus supplement no. 8 dated March 23, 2001, the prospectus supplement no.
9 dated April 27, 2001 and the prospectus supplement no. 10 dated May 4, 2001
are superseded by the following table:

                                SELLING HOLDERS

We originally issued the Notes and the Notes were sold by the initial purchasers
in a transaction exempt from the registration requirements of the Securities Act
to persons reasonably believed by the initial purchasers to be qualified
institutional buyers or other institutional accredited investors. Selling
holders, including their transferees, pledgees or donees or their successors,
may from time to time offer and sell pursuant to this prospectus any or all of
the Notes and common stock into which the Notes are convertible. We agreed to
use reasonable efforts to keep the registration statement effective until July
26, 2002. Our registration of the Notes and the shares of common stock into
which the Notes are convertible does not necessarily mean that the selling
holders will sell any or all of the Notes or the shares of the common stock into
which the Notes are convertible.

The following table sets forth information, as of May 11, 2001, with respect to
the selling holders and the principal amounts of Notes beneficially owned by
each selling holder that may be offered under this prospectus. The information
is based on information provided by or on behalf of the selling holders. The
selling holders may offer all, some or none of the Notes or common stock into
which the Notes are convertible. Because the selling holders may offer all or
some portion of the Notes or the common stock, no estimate can be given as to
the amount of the Notes or the common stock that will be held by the selling
holders upon termination of any sales. In addition, the selling holders
identified below may have sold, transferred or otherwise disposed of all or a
portion of their Notes since the date on which they provided the information
regarding their Notes in transactions exempt from the registration requirements
of the Securities Act.

                                      S-1




                                           Principal Amount       Common Stock
                                               of Notes             Issuable
                                          Beneficially Owned    upon Conversation    Common Stock
                  Selling Holder             and Offered        of the Notes (1)       Offered
---------------------------------------  --------------------  -------------------  --------------
                                                                           
AAM/Zazove Institutional Income               1,200,000              14,284             14,284

ABN AMRO Incorporated                           500,000               5,951              5,951
   Fund, L.P.

AIG Soundshore Opportunity Holding            2,488,000               29,615             29,615
   Fund Ltd.

AIG Soundshore Strategic Holding              2,185,000               26,008             26,008
   Fund Ltd.

Alexandria Global Investment Fund I LTD.      3,000,000               35,710             35,710

Arbitex Master Fund, L.P.                     4,500,000               53,565             53,565

Argent Classic Convertible Arbitrage         15,000,000              178,550            178,550
   Fund (Bermuda) L.P.

Argent Convertible Arbitrage Fund Ltd.        1,000,000               11,903             11,903

Aspen Global Technology Fund                    674,000                8,023              8,023

Associated Electric & Gas Insurance             850,000               10,117             10,117
   Services Limited

AST Janus Small Cap Growth Portfolio          8,185,000               97,429             97,429

Aventis Pension Master Trust                    440,000                5,237              5,237

Bank Austria Cayman Islands, Ltd.             5,500,000               65,468             65,468

Bank of America Securities, LLC               5,000,000               59,516             59,516

BankAmerica Pension Plan                      2,000,000               23,807             23,807

Black Diamond Offshore, Ltd.                    665,000                7,916              7,916

Boilermaker - Blacksmith Pension Trust        2,700,000               32,139             32,139

BS Debt Income Fund - Class A                    15,000                  178                178

CALAMOS(R) Convertible Portfolio -              150,000                1,785              1,785
   CALAMOS(R) Advisors Trust

CALAMOS(R) Convertible Technology Fund          390,000                4,642              4,642
   - CALAMOS(R) Investment Trust

CALAMOS(R)High Yield Fund -                     390,000                4,642              4,642
   CALAMOS(R) Investment Trust

Canyon Capital Arbitrage Master Fund          1,000,000               11,903             11,903

Canyon Value Realization (Cayman) Ltd.       11,000,000              130,937            130,937


                                      S-2





                                             Principal Amount       Common Stock
                                                 of Notes             Issuable             Common
                                            Beneficially Owned     upon Conversation        Stock
          Selling Holder                       and Offered         of the Notes (1)        Offered
---------------------------------------------------------------------------------------------------
                                                                                
CFFX, LLC                                        1,000,000              11,903              11,903

CIBC World Markets                               5,500,000              65,468              65,468

City of Albany Pension Fund                        245,000               2,916               2,916

City of Knoxville Pension System                   640,000               7,618               7,618

Clinton Riverside Convertible                    2,100,000              24,997              24,997
   Portfolio Limited

Cova Bond Debenture Fund                           500,000               5,952               5,952

Coastal Convertibles Ltd.                          500,000               5,952               5,952

Credit Suisse First Boston Corporation           4,000,000              47,613              47,613

Credit Research & Trading LLC                    2,193,000              26,104              26,104

Deeprock + Co.                                   2,000,000              23,807              23,807

Delphi Financial Group, Inc.                       500,000               5,952               5,952

Delta Airlines Master Trust                      4,900,000              58,326              58,326

Delta Pilots Disability Survivorship               200,000               2,380               2,380
   Trust

Department of Fire & Police                      7,075,000              84,216              84,216
   Pensions Systems

Deutsche Bank Securities Inc.                   56,134,000             668,182             668,182

Double Black Diamond Offshore, LDC               2,708,000              32,234              32,234

Dreyfus High Yield Strategies Fund               5,200,000              61,897              61,897

Duckbill + Co.                                     630,000               7,499               7,499

Enron North America, Inc.                        1,000,000              11,903              11,903

Elf Aquitaine                                      150,000               1,786               1,786

Florida Street Bond Fund                         1,000,000              11,903              11,903

Fuji U.S. Income Open                              500,000               5,952               5,952

General Motors Employees Global                  6,175,000              73,503              73,503

General Motors Welfare Benefit                   2,000,000              23,807              23,807
   Trust (St. Veba)

Greek Catholic Union II                             45,000                 535                 535

Greenlight Capital, L.P.                         4,437,000              52,815              52,815

Greenlight Capital Offshore, Ltd.                9,429,000             112,236             112,236

Greenlight Capital Qualified, L.P.               9,994,000             118,962             118,962

Helix Convertible Opportunities Fund Ltd.        2,660,000              31,662              31,662

Helix Convertible Opportunities, L.P.            3,140,000              37,376              37,376

Helix Credit Arbitage Master Fund, L.P.          2,315,000              27,556              27,556

IBM Retirement Plan - High Income                  525,000               6,249               6,249

Ilanot Batucha Investment House LTD                300,000               3,571               3,571


                                      S-3




                                              Principal Amount        Common Stock
                                                  of Notes              Issuable           Common
                                              Beneficially Owned    upon Conversation       Stock
          Selling Holder                        and Offered          of the Notes (1)      Offered
--------------------------------------------------------------------------------------------------
                                                                                 
Israel Brokerage & Investments IBI LTD               100,000              1,190              1,190

Janus Global Technology Fund                      16,665,000            198,369            198,369

Janus Venture Fund                                19,025,000            226,461            226,461

Jefferies & Co.                                      875,000             10,415             10,415

Jersey (IMA) Ltd.                                    250,000              2,976              2,976

JMG Capital Partners, L.P.                           500,000              5,951              5,951

JMG Triton Offshore Fund, Ltd.                       500,000              5,951              5,951

J.P. Morgan Securities, Inc.                       5,030,000             59,873             59,873

Julius Baer Securities, Inc.                         250,000              2,975              2,975

JWF Global Technology Fund                         1,154,000             13,736             13,736

JWF US Ventre Fund                                 1,990,000             23,688             23,688

KBC Financial Products USA Inc.                    4,500,000             53,565             53,565

Kettering Medical Center Funded                      160,000              1,904              1,904
   Depreciation Account

Kentfield Trading, Ltd.                              950,000             11,308             11,308

Knoxville Utilities Board Retirement                 400,000              4,761              4,761
   System

Lehman Brothers Inc.                              18,500,000            220,211            220,211

Leonardo, L.P,                                    12,000,000            142,840            142,840

LibertyView Funds L.P.                               750,000              8,928              8,928

Lonestar Partners, L.P.                            4,500,000             53,565             53,565

Lord Abbett Bond Debenture Fund                    5,850,000             69,635             69,635

Louisiana Workers' Compensation                      360,000              4,285              4,285
   Corporation

Lumber Industries, Inc.                              750,000              8,927              8,927

Lydian Overseas Partners Master Fund              15,000,000            178,550            178,550

Magten Asset Management Corp. Pension                485,000              5,773              5,773
   Plan & Trust

Magten Group Trust                                   300,000              3,571              3,571

McMahan Securities Co. L.P.                        1,000,000             11,903             11,903


                                      S-4




                                                        Principal Amount         Common Stock
                                                            of Notes               Issuable
                                                       Beneficially Owned      upon Conversation        Common Stock
                  Selling Holder                          and Offered          of the Notes (1)            Offered
---------------------------------------------------   -------------------      -----------------        ------------
                                                                                               
Merrill, Lynch, Pierce, Fenner and Smith, Inc.                16,000                    190                    190

Miller Tabak Robert Securities, LLC                           45,000                    535                    535

Morgan Stanley & Co.                                       2,500,000                 29,758                 29,758

Nomura/Janus Global Technology                             1,507,000                 17,938                 17,938

Oxford Lord Abbett + Co.                                   1,000,000                 11,903                 11,903

Pacific Life Insurance Company                             1,000,000                 11,903                 11,903

Peoples Benefit Life Insurance Company                     4,220,000                 50,232                 50,232

Peoples Benefit Life Insurance Company (Teamsters          6,250,000                 74,395                 74,395
   Separate Account)

Port Authority of Allegheny County                         2,825,000                 33,626                 33,626
   Retirement and Disability Allowance
   Plan for the Employees Represented by Local 85
   of the Amalgamated Transit Union

Quattro Crestline Special Situations                         500,000                  5,951                  5,951

Quattro Fund                                               1,000,000                 11,903                 11,903

Ramus Capital Group Holdings, Ltd.                         1,300,000                 15,474                 15,474

RCG Latitude Master Fund, Ltd.                               200,000                  2,380                  2,380

Research Capital Corporation                               9,650,000                114,867                114,867

Retail Clerks Pension Trust                                2,000,000                 23,807                 23,807

Retail Clerks Pension Trust #2                             1,000,000                 11,903                 11,903

Sage Capital                                               3,000,000                 35,710                 35,710

San Diego County Employee's                                  475,000                  5,654                  5,654
   Retirement Association

SPT                                                        1,100,000                 13,093                 13,093

Spear, Leeds & Kellogg Capital Markets                     2,000,000                 23,806                 23,806

St. Albans Partners Ltd.                                   4,000,000                 47,613                 47,613

Standard Mortage Holding Corp.                               500,000                  5,951                  5,951

The Bakal Company Limited Partnership                        150,000                  1,785                  1,785

The Class IC Company, Ltd.                                 1,500,000                 17,855                 17,855

The Common Fund FAO Absolute Return Fund                     635,000                  7,558                  7,558


                                      S-5




                                           Principal Amount       Common Stock
                                               of Notes             Issuable
                                          Beneficially Owned    upon Conversation    Common Stock
                  Selling Holder             and Offered        of the Notes (1)        Offered
---------------------------------------  --------------------  -------------------  --------------
                                                                           
The Dow Chemical Company Employees'             5,325,000               63,385            63,385
   Retirement Plan

The Fondren Foundation                            165,000                1,964             1,964

TQA Master Fund, LTD                            1,000,000               11,903            11,903

TQA Master Plus Fund, Ltd.                        435,000                5,177             5,177

UBS AG, London Branch                          20,000,000              238,066           238,066

UBS Warburg AG                                  2,000,000               23,806            23,806

Unifi, Inc. Profit Sharing Plan and               255,000                3,035             3,035
   Trust

United Food and Commercial Workers              1,260,000               14,998            14,998
   Local 1262 and Employees Pension
   Fund

United Mizrahi Bank LTD                            50,000                  595               595

Valentis Investors LLC                          2,000,000               23,806            23,806

Value Realization Fund B, LP                      500,000                5,952             5,952

Value Realization Fund, L.P.                    8,000,000               95,227            95,227

Van Waters & Rogers, Inc.                         770,000                9,165             9,165
   Retirement Plan

Wasserstein Perella Securities Inc.             7,600,000               90,465            90,465

Worldwide Transactions, Ltd.                      127,000                1,512             1,512

Zurich HFR Master Hedge Fund Index Ltd.           300,000                3,571             3,571

Any other holders of Notes or future           79,299,000              944,020           944,020
   holders (2)

Total                                        $500,000,000            5,951,673         5,951,673


(1)  Assumes a conversion rate of 11.9033 shares of common stock per $1,000
     principal amount of Notes and a cash payment in lieu of any fractional
     interest.

(2)  Assumes that any other holders of Notes or any future transferee from any
     holder do not or will not beneficially own any common stock other than
     common stock into which the Notes are convertible at the conversion rate of
     11.9033 shares of common stock per $1,000 principal amount of Notes.

                                      S-6


None of the selling holders nor any of their affiliates, officers, directors or
principal equity holders has held any position or office or has had any material
relationship with us within the past three years with the exception of Deutsche
Bank Securities, Inc. and Lehman Brothers, Inc. In the past three years,
Deutsche Bank and Lehman Brothers have acted as underwriters of the Company's
initial public offering and follow-on public offering and were initial
purchasers in the offering of the Notes. The selling holders purchased all of
the Notes in a private transaction. All of the Notes and the shares of common
stock into which the Notes are convertible are "restricted securities" under the
Securities Act.

Information concerning the selling holders may change from time to time and any
changed information will be set forth in supplements to this prospectus if and
when necessary. In addition, the conversion price, and therefore, the number of
shares of common stock issuable upon conversion of the Notes, is subject to
adjustment under certain circumstances. Accordingly, the aggregate principal
amount of Notes and the number of shares of common stock into which the Notes
are convertible may increase or decrease.

         The date of this prospectus supplement no. 11 is May 11, 2001.

                                      S-7