SA2030

sames FEATURES n SA2030 SA2030 PCM FRAME ALIGNER Frame Alignment Recovery and loss in accordance with CCITT recommendations G.732 and G.737 Jitter and phase-wander immunity exceed the requirements of CCITT recommendation G.823. Internal 1½ frame elastic buffer. Detection of incoming AlarmIndication-Signal (AIS), and Distant Alarm n Indication of Slip, loss of frame synchronisation, and loss of route clock conditions. ISO-CMOS Compatible. technology, TTL n n n n Pin-for-Pin replacement for Siemens PEB 2030 and SM 300 Microprocessor Interface n n APPLICATIONS n Delay compensation and clock alignment between 2,048MHz PCM30 transmission lines, and terminating equipment. Control of Jitter and Wander within Digital Networks. n Delay compensation between switching stages. Interfacing of PCM systems operating with different clocks. PCM concentrators and subscriber multiplexers. n n n GENERAL DESCRIPTION The SA2030 is designed to interface PCM-30 routes with switching systems. The device synchronises with the frame-format of the incoming data, and outputs this data in accordance with the bit and frame timing of the terminating equipment. The circuit is designed to tolerate delay, drift, wander and jitter of the incoming data and clock, and thus simplifies the design of data- and clock-recovery hardware. The internal 1½ frames elastic buffer provides for delay compensation and wander immunity. If the bounds of the buffer are exceeded, the SA2030 will either repeat o...