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XRT75L00：Single-Chip Line Interface Unit (LIU) With Jitter Attenuator (JA) for DS3/E3/STS-1 Environments

With an established, and industry proven series of physical layer, access and metro products, Exar extends its capabilities by releasing the XRT75L00, a single-channel DS3/E3/STS-1 Line Interface Unit (LIU) with an independent receiver, transmitter and jitter attenuator. Using an innovative combination of analog and digital signal processing technologies, this new approach will be embedded in Exar's physical interface and data aggregation devices.

Jitter is caused by many factors: cross-talk noise, imperfect timing recovery circuitry, or line interface/signal distortion. Typical corporate Wide Area Network (WAN) environments contain many pieces of equipment, where at each connection point (node) jitter can increase, and as a result new errors can be introduced into data transmitted throughout the system.

The XRT75L00 is the next generation solution for the design challenges presented by jitter. Previously, Exar launched the XRT71D00, the industry's first standards compliant jitter attenuator for DS3/E3 applications. It was soon followed by the industry's first multi-channel jitter attenuators (XRT71D03 and XRT71D04).

Product Highlights

The XRT75L00D has an independent receiver, transmitter and jitter attenuator in a single 52-pin TQFP package. It supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) operations, has a differential receiver which provides a high noise interference margins -- capable of receiving data from cables of over 1,000 feet, or up to 12dB of cable attenuation. The device has an onboard Pseudo Random Binary Sequence (PRBS) generator and detector that can insert and detect single bit errors. This function is often used for diagnostic purposes. The XRT75L00D provides both serial microprocessor interface as well as hardware mode for additional programming and control. It also supports local, remote and digital loop-backs.

Standard's Compliance

The receiver, transmitter, and jitter attenuator all meet Bellcore GR-499 CORE requirements. Also, the transmitter meets the GR-253 CORE and ANSI T1.102 specifications and it includes a duty cycle correction PLL. The device meets jitter and wander specifications described in the T1.105.03b, and ETSI TBR-24, and is compliant with jitter transfer templates outlined in ITU G.751, G.752 and G.755.

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