ACS8522
ACS8522 is Synchronous Equipment Timing Source manufactured by SEMTECH.
Synchronous Equipment Timing Source for Stratum 3/4E/4 and SMC Systems ADVANCED MUNICATIONS .. Description FINAL Features
ACS8522 SETS LITE
The ACS8522 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 ACS8522 is fully pliant with the required international specifications and standards. The device supports Free-run, Locked and Holdover modes, with mode selection controlled either automatically by an internal state machine or forced by register configuration. The ACS8522 accepts up to four independent input SEC reference clock sources from Recovered Line Clock, PDH network, and Node Synchronization. The ACS8522 generates independent SEC and BITS clocks, an 8 k Hz Frame Synchronization clock and a 2 k Hz Multi-Frame Synchronization clock, both with programmable pulse width and polarity. The ACS8522 includes a Serial Port, which can be SPI patible, providing access to the configuration and status registers for device setup. The ACS8522 supports IEEE 1149.1[5] JTAG boundary scan. The User can choose between OCXO or TCXO to define the Stratum and/or Holdover performance required.
Suitable for Stratum 3, 4E, 4 and SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications (to Telcordia 1244-CORE[19] Stratum 3 and GR-253[17], and ITU-T G.813[11] Options Ι and ΙΙ specifications) Accepts four individual input reference clocks, all with robust input clock source quality monitoring Simultaneously generates four 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, 0.1 Hz to 70 Hz in 10 steps Automatic hit-less source switchover on...
