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PMC-CGM Installation and Use (6806800D53C)
21
Introduction
1.1 Features
The Clock Generator Module (PMC-CGM) is a PMC module which is either available together
with the Emerson ATCA-F103 switch or as part of an accessory kit. It can only be used in
conjunction with the ARTM-F103-STX.
The PMC-CGM is delivered with payload software which lets you configure and monitor the
clock synchronization via SNMPv2 and Management Information Bases (MIBs). You may use
the software as an interface to write a higher-level clock manager software.
The PMC-CGM serves the following purposes:
z Synchronizes to a reference clock (line card clock CLK3, aka. REFA/REFB or external
E1/T1 clock) and provides a system clock (CLK1/CLK2) in an AdvancedTCA chassis and
to up to two extension shelves.
z Acts as temporary stand-alone clock source if all reference clocks failed while maintaining
clock phase and frequency as long as possible ("holdover mode").
This is accomplished by measuring the reference clock against a high-precision oscillator
and calculating the frequency/phase offset to be applied when the reference clock fails.
The hardware/firmware is designed so that two clock modules form a protection (master/slave)
pair. If the master module fails, the slave module takes over seamlessly without disturbing the
system clocks.
For a PMC-CGM support on the ATCA-F103, the following software versions (or higher) are
required on the ATCA-F103:
z Application: 4.0.629
z IPMI firmware: 1.03.082
z Bootloader: 4.0.629
For more details on the clocking concept used in your system refer to the Centellis CO 31kX
Installation and Use manual.