Exar Debuts T3/E3 ATM UNI Framer, LIU with Jitter Attenuation

5/30/2003 - Exar Corporation (Nasdaq: EXAR), a leading provider of high-performance, mixed-signal silicon solutions for the worldwide communications infrastructure announced a next generation silicon solution incorporating a Line Interface Unit (LIU), Jitter Attenuator (JA) and ATM UNI framer in one innovative combination device. The XRT79L71, the first in a family of solutions, is a single-channel device targeted at telecommunications equipment including digital access and cross connect systems, wireless base stations, and Digital Subscriber Line Access Multiplexers (DSLAMs) among others. Additional multi-channel parts will be announced later during the year.

"The XRT79L71 is truly a breakthrough product for Exar, and demonstrates how we are leveraging our world-class engineering resources to give customers new design options and functionality" said Dr. Roubik Gregorian, chief operating officer. "It builds on Exar's industry-proven functional device elements offered in initial products (LIUs, framers etc.), capitalizes on their subsequent multi-channel versions, and now combines these already established capabilities into a highly integrated device."

Product Details
The device is a single-channel, Asynchronous Transfer Mode (ATM), Universal Network Interface (UNI) physical-layer processor incorporating a T3/E3 framer, LIU and JA. The device supports ATM direct mapping and cell delineation as well as PPP mapping and frame processing. For clear-channel framer applications it provides both transmission and reception of user data from the DS3/E3 payload. The device has a flexible microprocessor interface for easy configuration and control, and meets industry-standard UTOPIA II and POS-PHY specifications operating at 25MHz, 33MHz, or 55Mhz. The XRT79L71 has an integrated clock multiplier that generates DS3/E3 clocks from a single frequency clock source. It contains an on-chip 16- cell First In, First Out (FIFO) for ATM applications that supports various configuration levels in both the transmit and receive directions. Also, the device has an on-chip 54-byte transmit and receive OAM cell buffer for the transmission, reception and processing of OAM cells. In addition, the XRT79L71 includes a PRBS generator/receiver. The device meets the jitter specifications described in ETSI TBR-24, and Bellcore GR-253 and GR-499. "With this device customers can bring their designs to market faster because the functional elements (LIU, JA etc.) are already interoperable, and require no additional design effort," said Hugh Wright, director of marketing. "Conventional solutions require several discrete devices to do what this part can accomplish, and subsequent multi-channel versions will deliver even more design benefits."

Prices, Packages and Availability
Samples of the XRT79L71 are available now. In a 208-lead ST PBGA package at 1K volumes the XRT79L71 is $49.98. The device is a 3.3V, 5V input tolerant device.

About Exar
Exar Corporation (NASDAQ: EXAR) designs, develops and markets high-performance, analog and mixed-signal silicon solutions for the worldwide communications infrastructure. Leveraging its industry-proven analog design expertise, system-level knowledge and standard CMOS process technologies, Exar provides OEMs innovative, highly integrated ICs that facilitate the transport and aggregation of signals in access, metro and wide area networks. The Company's physical layer silicon solutions address transmission standards such as T/E carrier, ATM and SONET. Additionally, Exar offers ICs for both the serial communications and the video and imaging markets. The Company is based in Fremont, CA, had fiscal 2003 revenues of $67 million, and employs approximately 265 people worldwide. For more information about Exar, visit www.exar.com.

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