ACS8509
ACS8509 is Synchronous Equipment Timing Source manufactured by SEMTECH.
Synchronous Equipment Timing Source for SONET or SDH Network Elements ADVANCED MUNICATIONS .. Description FINAL Features
ACS8509 SETS
The ACS8509 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 ACS8509 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 ACS8509 generates independent SEC and BITS/SSU clocks, an 8 k Hz Frame Synchronization clock and a 2 k Hz Multi-Frame Synchronization clock. Two ACS8509 devices can be used together in a Master/ Slave configuration mode allowing system protection against a single ACS8509 failure. A microprocessor port is incorporated, providing access to the configuration and status registers for device setup and monitoring. The ACS8509 includes a choice of edge alignment for 8 k Hz input, as well as a low jitter n x E1/DS1 output mode. The User can choose between OCXO or TCXO to define the Stratum and/or Holdover performance required.
Block Diagram
Figure 1 Block Diagram of the ACS8509 SETS
T4 DPLL/Freq. Synthesis
Suitable for Stratum 3E- , 3, 4E, 4 and SONET Minimum Clock (SMC) or SONET/SDH Equipment Clock (SEC) applications Meets AT&T, ITU-T, ETSI and Telcordia specifications Accepts four individual input reference clocks Generates six output clocks Supports Free-run, Locked and Holdover modes of operation Robust input clock source quality monitoring on all inputs Automatic “hit-less” source switchover on loss of input Phase build-out for output clock phase continuity during input switchover and mode transitions Microprocessor interface
- Intel, Motorola, Serial, Multiplexed, EPROM ...
