User's Manual

Module Front Panel LED Indicators and Connectors
68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
6-30
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 Ω 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 Transistor-Transistor Logic (TTL)
active-high signal with a pulse width of 153 nanoseconds.
MMI Connector
Behind front panel - only accessible when card is partially extended
from SCCP shelf slot. 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