363-206-285
Circuit Pack Descriptions
Issue 3 June 2001
7-147
Performance Monitoring 7
The 27G-U/27G2-U OLIU provides PM circuitry for the following performance
parameters:
â– STS-1 section SEFS count
â– Line coding violation counts (B2 parity)
â– Line errored seconds
â– STS-1 path coding violation counts (B3 parity)
â– STS-1 path errored seconds
â– VT path coding violation counts (V5 parity)
â– VT path errored seconds.
Power Circuitry 7
Power for the 27G-U/27G2-U OLIU circuit pack is provided by a DC-to-DC
converter located on the 27G-U/27G2-U OLIU circuit pack. The converter supplies
+5 volts. Both A and B −48 volt backplane busses supply power to the converter
through diode ORed circuit pack-mounted power select circuits and a circuit pack-
mounted fuse. Failure of the fuse or converter causes the red FAULT LED to light.
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