ZyXEL IES-5000 IP DSLAM Receives NEBS Certification

Hsinchu, November 27, 2006 -- After successfully obtained the Network Equipment Building System (NEBS) certification for its IES-1248 remote IP DSALM in July, ZyXEL Communications Corp. (TSE:2391) today announced that its 6.5U Central Office IP DSLAM (IES-5000) has been successfully certified by NEBS as well. With its non-blocking Gigabit backplane, failover-enabled management features and versatile subscriber interfaces, ZyXEL IES-5000 IP DSLAM is suitable for Telco/ISP to deliver high-quality broadband service to today's residential and business customers.

"As a requirement for Central Office equipments used on the North American Public Switched Network, the strict NEBS criteria has become an universal measurement for excellent network products," said P.C. Lee, VP of ZyXEL Central Office Equipment Business Unit. "We are delighted that the IES-5000 becomes NEBS-certified. This official recognition for excellent quality is an important milestone in the continuous technological innovation of our company. Assured by the endorsement from rigorous NEBS tests, service providers can confidently deploy our solutions on their carrier-class networks."

NEBS contains the most common set of safety, spatial and environmental design guidelines applied to telecommunications equipment in the United States. NEBS tests include GR-63-CORE, GR-1089-CORE and SBC TP76200 for evaluating and measuring environmental, safety, and quality standards of telecommunications equipment regarding product functionalities.

To successfully obtain the certification, ZyXEL IES-5000 IP DSLAM had to undergo a range of stringent tests, including electro-magnetic emissions, fire spread testing, power consumption, earthquake simulation as well as thermal and mechanical shocks.

Specifically designed to meet the requirements of today's distributed Telco/ISP infrastructure, ZyXEL IES-5000 system is a 6.5U, chassis-based multi-service IP DSLAM with separate splitter cards in a 5U IES-5000ST chassis.

As the flagship product line of ZyXEL IP DSLAM, the IES-5000 series is equipped with non-blocking Gigabit backplane, failover-enabled Management Switch Cards (MSC), dual power modules and high port density DSL line cards. With embedded IP-centric QoS, security and multicasting firmware features, the IES-5000 is a system that facilitates Telco/ISP to deliver quality experience to today's demanding residential and business customers, and to achieve their infrastructure provisioning criteria of reliability, flexibility and scalability at a competitive CAPEX/OPEX.

ZyXEL IES-5000 system provide diverse DSL and management switch cards with separated splitter cards to suit the business and residential needs of different DSL markets:
IES-5000M  10-slot rack mountable main system with 19" or 23" chassis
ALC1248G  Hot swappable 48-port ADSL2/ADSL2+ Annex A/Annex B line card
SLC1248G  Hot swappable 48-port SHDSL/SHDSL.bis line card
VLC1224G  Hot swappable 24-port VDSL2 line card
MSC1000G  Fail over-enabled Network Termination Card
IES-5000ST  Splitter chassis with 16 slots for splitter or extension cards
ASC1024  24-port ADSL2/ADSL2+ Annex A/Annex B splitter cards
VSC1024  24-port DMT-based VDSL2 splitter cards
SEC1024  24-port SHDSL/SHDSL.bis splitter cards
All are currently available and can be ordered via ZyXEL's global sales network. To find a ZyXEL distributor nearest to your location, visit the information site at http://www.zyxel.com/web/where_tobuy.php

About ZyXEL Communications
ZyXEL Communications Co. (TSE: 2391), headquartered in Hsinchu, Taiwan, is the world's leading broadband solution provider. ZyXEL's wide ranging Internet Protocol (IP) based networking solutions include access multiplexors, customer premise equipment, Internet security and Wireless LAN equipment, enabling high-performance network services for SOHO, small to mid-sized businesses and service providers. ZyXEL works closely with worldwide network equipment vendors, telecommunications companies, ISPs, and other major businesses. For more information, visit the company's Website at http://www.zyxel.com.