Exar has announced its R3 technology, and the expansion of its T1/E1/J1 offerings with the introduction of three new, low power, highly integrated, short haul LIUs. The new single, four and eight-channel devices (XRT83SL30 / XRT83SL34 / XRT83SL38) are targeted at multiservice provisioning platforms (MSPPs), access devices, media gateways, routers, and frame relay access devices.
Distancing it from competitive offerings, Exar says that R3 technology (reconfigurable, relayless redundancy) delivers key innovative features to customers designing T1/E1/J1 interface cards. The devices are reconfigurable with integrated termination supporting all common T1/E1/J1 line impedances (75/100/110/120 W) enabling customers to build one board with a single bill-of-materials. Conventional approaches require fixed settings - T1, or E1, or J1, forcing customers to determine device settings before manufacturing, and carry all configurations in inventory even if they are not immediately required. Also, the series employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel or card that can be brought on-line in the event of failure.
The devices meet or exceed popular networking specifications ITU G.703, G.775, ANSI T1.402. and the Bellcore GR-499 core. Other features of the family include a parallel microprocessor bus supporting both synchronous and asynchronous micro-processor interfaces for Motorola, Intel and MIPS processors. A crystal-less jitter attenuator that can be switched into either the transmit or receive path. Also, because of their inherent flexibility and standards compliance, the LIUs can be used in conjunction with any T1/E1/J1 framer whether it is Exar's eight-channel framer, the XRT84L38, or a customer's specific device.
For more information contact Kobus van Rooyen, ASIC Design Services, 011 315 8316, [email protected]
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