Alcatel 7750 SR-12, Installation Manual

Page: 82 / 158

Monitoring AC Power
Page 80
7750 SR-12
M
ONITORING
AC P
OWER
A power supply monitoring (Y-type) cable can be attached from the J10 and J11 connectors on the
rear of the AC power shelf to a DB-25 connector on the DC PEM. When initialized, the connection
provides status such as AC power supply presence, a missing power supply, fault reporting, and
over-temperature conditions to the active CPM and lights the corresponding power supply LEDs
on the CPM faceplate.
The following are the optically isolated open-collector signals:
• Fault — The unit has detected an internal fault.
• Overtemperature Warning (OTW) — The unit is overheating. Shutdown is imminent (8-
second warning).
• Power Fail Warning — The output of the power unit will fail within five milliseconds.
See Appendix C: Pinout Assignments on page 149 for the status cable pin assignments.
Figure 26: Status Cable Connections
3
4
1 2
SR12011A