ACS8530
ACS8530 is Synchronous Equipment Timing Source manufactured by SEMTECH.
Synchronous Equipment Timing Source for Stratum 2/3E Systems ADVANCED MUNICATIONS .. Description FINAL Features
ACS8530 SETS
The ACS8530 is a highly integrated, single-chip solution for the Synchronous Equipment Timing Source (SETS) function in a SONET or SDH Network Element. The device generates SONET or SDH Equipment Clocks (SEC) and Frame Synchronization clocks. The ACS8530 is fully pliant with the required international specifications and standards. The device supports Free-run, Locked and Holdover modes. It also supports all three types of reference clock source: recovered line clock, PDH network, and node synchronization. The ACS8530 generates independent SEC and BITS clocks, an 8 k Hz Frame Synchronization clock and a 2 k Hz Multi-Frame Synchronization clock. Two ACS8530 devices can be used together in a Master/ Slave configuration mode allowing system protection against a single ACS8530 failure. A microprocessor port is incorporated, providing access to the configuration and status registers for device setup and monitoring. The ACS8530 supports IEEE 1149.1[5] JTAG boundary scan.
Block Diagram
Suitable for Stratum 2, 3E, 3, 4E and 4 and SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications (to Telcordia 1244-CORE[19] Stratum 3E, and GR-253[17], and ITU-T G.812[10] Type III and G.813[11] specifications) Accepts 14 individual input reference clocks, all with robust input clock source quality monitoring Simultaneously generates nine output clocks, plus two sync pulse outputs Absolute Holdover accuracy better than 3 x 10-10 (manual), 7.5 x 10-14 (instantaneous); Holdover stability defined by choice of external XO Programmable PLL bandwidth, for wander and jitter tracking/attenuation, 0.5 m Hz to 70 Hz in 18 steps Automatic hit-less source switchover on loss of input Phase Transient Protection and Phase Build-out on locked to reference and on reference switching Microprocessor interface
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