Technical data

Configuring and Operating the System
AXP 1410 Installation and Use (6806800H70D)
103
Power conversion for the SAMs and PEMs consists of two 66 watt, +48VDC to +12VDC
converters which distribute dual power busses of +12VDC to separate parts of the system. The
+12VDC outputs are provided on the backplane connector to the rest of the shelf. Power is
redundant via the secondary PEM.
Power is introduced to the PEM using a DC power cable attached to the terminal blocks on the
front of the module (power input cable and return cable). The terminal block consists of a dual
stud connection which prevents the power cables from rotating and provides secure contacts
for the cable lug. There is a plastic cover that protects the cable connections.
5.5.2 IPMC Circuitry
Each PEM is capable of monitoring voltage and circuit breaker status. The PEMs are loaded with
the AdvancedTCA IPMC firmware. Preprogrammed FRU and Sensor Data Record (SDR)
information reside on the PEM and is accessible from the SAM via the IPMB ports of the PEM. In
addition, the IPMC monitoring functions include digital inputs to detect circuit breaker trips,
Removing power to these components cannot be accomplished by turning the PEM's circuit
breakers to the OFF position. The PEMs remain powered until the -48VDC power to each
PEM is removed. Make sure you disconnect the power at the external source before
removing the PEM from the shelf.
The DC power inputs must only be attached to approved Telephone Network Voltage (TNV-
2) or Safety Extra Low Voltage (SELV) branch circuits. Branch circuits must comply with all
requirements called for in these safety standards: IEC 60950, EN 60950, CAN/CSA-C22.2 No.
60950. Attaching inputs to non-TNV-2/SELV approved power sources will cause the system
to fail compliance with safety regulations.