User Manual

Troubleshooting
68P09255A57-2
Aug 2002
SC4812ET Optimization/ATP Manual Software Release R16.1.x.x
PRELIMINARY
6-18
Figure 6-1: CSM Front Panel Indicators & Monitor Ports
PWR/ALM
Indicator
FREQ
MONITOR
SYNC
MONITOR
FW00303
. . . continued on next page
FREQ Monitor Connector
A test port provided at the CSM front panel via a BNC receptacle allows
monitoring of the 19.6608 MHz clock generated by the CSM. When
both CSM 1 and CSM 2 are in an in-service (INS) condition, the CSM 2
clock signal frequency is the same as that output by CSM 1.
The clock is a sine wave signal with a minimum amplitude of +2 dBm
(800 mVpp) into a 50 load connected to this port.
SYNC Monitor Connector
A test port provided at the CSM front panel via a BNC receptacle allows
monitoring of the Even Second Tick reference signal generated by the
CSMs.
At this port, the reference signal is a TTL active high signal with a pulse
width of 153 nanoseconds.
MMI Connector - Only accessible behind front panel. The
RS-232 MMI port connector is intended to be used primarily in
the development or factory environment, but may be used in the
field for debug/maintenance purposes.
6