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TERN - Adelphia Deploys Terayon's DOCSIS 2.0 Cable Modem Termination System to Enable New High-Speed Broadband Services

/FROM PR NEWSWIRE SAN FRANCISCO 415-543-7800/
TO BUSINESS AND TECHNOLOGY EDITORS:

Adelphia Deploys Terayon's DOCSIS 2.0 Cable Modem Termination System to Enable
New High-Speed Broadband Services

Nation's Fifth Largest Cable Television Operator Offers Its Power Link and
Power Link Premier Services Nationwide Using Terayon's DOCSIS 2.0 CMTSs and
Cable Modems

SANTA CLARA, Calif., April 12 /PRNewswire-FirstCall/ -- Terayon
Communication Systems, Inc. (Nasdaq: TERN), a leading provider of broadband
access, delivery and management solutions, today announced that Adelphia
Communications, Inc. (OTC: ADELQ), the fifth largest cable television operator
in the U.S. has so far deployed more than 200 Terayon BW DOCSIS(TM) 2.0 CMTSs
(Cable Modem Termination System), providing its Power Link and Power Link
Premier services with added bandwidth for faster upload and download speeds,
and improving performance for subscribers who frequently trade multimedia
files such as digital photos, music and video, play online games and use
peer-to-peer file sharing applications. Terayon was selected as one of
Adelphia's primary CMTS suppliers last year.
"The complete Terayon DOCSIS 2.0 solution allows us to stay ahead of our
broadband competition by optimizing bandwidth and maximizing our existing
infrastructure to offer higher speeds with greater reliability," said Marwan
Fawaz, chief technology officer, Adelphia. "DOCSIS 2.0 has enabled us to
increase our broadband speeds today, and it is ideal for future offerings."
"Terayon has led the cable industry with the first and only complete
DOCSIS 2.0 cable data system, allowing operators like Adelphia to
cost-effectively introduce the next wave of exciting broadband services," said
Zaki Rakib, CEO of Terayon. "Our success helping Adelphia and other customers
migrate to DOCSIS 2.0 during the past year gives us unrivaled operational
experience into what is required for a smooth transition. We have used this
real-world experience to further develop and refine our CMTS to make it the
most robust and deployment-ready DOCSIS 2.0 CMTS on the market."
Adelphia is accelerating deployments of the Terayon DOCSIS 2.0 end-to-end
solution in several of its markets nationwide.
Adelphia selected Terayon as one of its primary CMTS vendors after a
successful and comprehensive trial in its Los Angeles network. The trial
tested Terayon's BW 3500 DOCSIS 2.0 qualified CMTS and TJ 715x DOCSIS 2.0
certified cable modems in an end-to-end system configuration. The results
validated the advantages of DOCSIS 2.0, including its improved upstream
performance and reliability when delivering high-speed, high-bandwidth
service.

About Terayon's end-to-end DOCSIS 2.0 System
Terayon offers the only complete, end-to-end cable data system that meets
the DOCSIS 2.0 specification. The system is comprised of the TJ 715x cable
modem and the BW 3500 or BW 3200 model CMTS.
The TJ 715x is the latest of Terayon's DOCSIS 2.0 cable modems, more than
1.5 million of which have been deployed by operators worldwide, including the
top five U.S. operators.
Complementing the TJ 715x is the BW 3500 CMTS, the industry's first and
only CMTS qualified to meet the DOCSIS 2.0 and PacketCable(TM) specifications.
The BW 3500 is a scalable, carrier-class CMTS for operators' most demanding
broadband voice and data applications for residential subscribers and for
business customers. Deployed in a cable operator's headend -- the central
point of a cable network -- the BW 3500 manages DOCSIS cable modems deployed
by the operator's subscribers, forming an end-to-end system for delivering
broadband services. Terayon also offers the compact BW 3200 CMTS, which is
suited for smaller cable systems or large segmented systems.

About Adelphia
Adelphia Communications Corporation is the fifth-largest cable television
company in the country. It serves customers in 30 states and Puerto Rico, and
offers analog and digital video services, high-speed Internet access and other
advanced services over Adelphia's broadband networks.

About Terayon
Terayon Communication Systems, Inc. provides access and delivery
management platforms for broadband providers, cable companies, satellite
operators and broadcasters for the delivery of advanced, carrier-class voice,
data and video services. Terayon, headquartered in Santa Clara, California,
has sales and support offices worldwide, and is traded on the Nasdaq under the
symbol TERN. Terayon can be found on the web at www.terayon.com.

"Safe Harbor" Statements under the Private Securities Litigation Reform
Act of 1995:
Except for the historical information contained herein, this news release
contains forward-looking statements, estimates and assumptions by Terayon and
other parties that involve risks and uncertainties, including Terayon's
ability to gain new business; Terayon's ability to develop new,
technologically advanced products; the performance capabilities of the TJ 715x
cable modem, the BW 3500 CMTS and the BW 3200 CMTS; the reliability and
capabilities of DOCSIS 2.0; the acceptance of Terayon's new products in the
market; the sales of Terayon's new products; the expansion of operations by
Terayon's customers and the deployment of Terayon's products in specific
markets; as well as the other risks detailed from time to time in Terayon's
filings with the Securities and Exchange Commission.

NOTE: Terayon and the Terayon logo are registered trademarks of Terayon
Communication Systems, Inc. All other trademarks are property of their
respective owners.

SOURCE Terayon Communication Systems, Inc.

/CONTACT: Press, John Giddings, Terayon PR Manager, [phone], or
[e-mail]; or James Hannon of AtomicPR, [phone],
[e-mail]; or Investors, Kristin Stokan, Terayon Director,
Finance,[phone], or [e-mail] /

/Web site: http://www.terayon.com /

Apr-12-2004 11:30 GMT
Symbols:
DE;TYN US;ADELQ US;TERN
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