<PAGE>
Exhibit 23.1
CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
We consent to the reference to our firm under the caption "Experts" in Amendment
No. 1 to the Registration Statement (Form S-3 No. 333-37978) and related
Prospectus of Terayon Communication Systems, Inc. for the registration of
3,866,468 shares of its common stock and to the incorporation by reference
therein of our reports dated January 17, 2000, with respect to the consolidated
financial statements and schedule of Terayon Communication Systems, Inc.
included in its Annual Report (Form 10-K/A), as amended on April 28, 2000 for
the year ended December 31, 1999, filed with the Securities and Exchange
Commission.
/s/ Ernst & Young LLP
San Jose, California
June 27, 2000
