ACS8525: Line Card Protection Switch for SONET/SDH Systems
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.
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- 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
- Generates 8 kHz Frame Sync and 2 kHz Multi-Frame Sync output clocks with programmable pulse width and polarity
- 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
- ACS8525 : NCNR, 160 per tray, ok to order partial tray quantities
- ACS8525T: Lead-free, RoHS and WEEE compliant, NCNR, 160 per tray, ok to order partial tray quantities
