ACS8515: Rev 2.1 Line Card Protection Switch for SONET or SDH Network Elements

The ACS8515 is a highly integrated, single-chip solution for ‘hit-less’ protection switching of SEC clocks from Master and Slave SETS clockcards in a SONET or SDH Network Element. The ACS8515 has fast activity monitors on the inputs and will implement automatic system protection switching against master clock failure.

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Features

Suitable for Stratum 3, 4E and 4 SONET or SDH Equipment Clock (SEC) applications
Meets AT&T, ITU-T, ETSI and Telcordia (Bellcore) specifications
Three SEC input clocks, from 2 kHz to 155.52 MHz
Generates two SEC output clocks, up to 311.04 MHz
Frequency translation of SEC input clock to a different local line card clock
Robust input clock source frequency and activity monitoring on all inputs
Supports free-run, locked and holdover modes of operation
Automatic 'hit-less' source switchover on loss of input
External force fast switch between SEC inputs
Phase build out for output clock phase continuity during input switchover
SPI™-compatible serial microprocessor interface
Programmable wander and jitter tracking attenuation 0.1 Hz to 20 Hz
Single +3.3 V operation. +5 V I/O compatible
Operating temperature (ambient) -40°C to +85°C
64-pin LQFP package