ACS8525 Line Card Protection Switch for SONET/SDH Systems QFP64 ST Original
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Description
The ACS8525 is a highly integrated, single-chip solution
for “Hit-less” protection switching of SEC (SDH/SONET
Equipment Clock) + Sync clock “Groups”, from Master
and Slave SETS clock cards and a third (Stand-by) source,
for Line Cards in a SONET or SDH Network Element. The
ACS8525 has fast activity monitors on the SEC clock
inputs and will implement automatic system protection
switching against the Master clock failure. The selection
of the Master/Slave input can be forced by a Force Fast
Switch pin. If both the Master and Slave input clocks fail,
the Stand-by “Group” is selected or, if no Stand-by is
available, the device enters Digital Holdover mode.
The ACS8525 can perform frequency translation,
converting, for example, an 8 kHz SEC input clock from a
backplane into a 155.52 MHz clock for local line cards.
Features:
SONET/SDH applications up to OC-3/STM-1 bit rates
Switches between grouped inputs (SEC/Sync pairs)
Inputs: three SECs at any of 2, 4, 8 kHz (and N x 8 kHz multiples
up to 155.52 MHz), plus Frame Sync/Multi
Frame Sync
Outputs: two SEC clocks at any of several spot frequencies from 2
kHz up to 77.76 MHz
via the TTL/CMOS port and up to 311.04 MHz via the PECL/LVDS port
Selectable clock I/O port technologies
Modes for E3/DS3 and multiple E1/DS1 rate output clocks
Frequency translation of SEC input clock to a different local
line card clock
Robust input clock source activity monitoring on all inputs
Supports Free-run, Locked and Digital Holdover modes of operation
Automatic “Hit-less” source switchover on loss of input
External force fast switch between SEC1/SEC2 inputs
Phase Build-out for output clock phase continuity during input
switchover
PLL “Locked” and “Acquisition” bandwidths individually selectable
from 18, 35 or 70 Hz
Serial interface for device set-up
Single 3.3 V operation, 5 V I/O compatible
Operating temperature (ambient) of -40 to +85°C
Available in LQFP 64 package
Lead (Pb)-free version available (ACS8525T), RoHS and WEEE
compliant
Deli electronics tehcnology Co.,Ltd
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