User's Manual

Module Front Panel LED Indicators and Connectors

68P64115A18–1

Mar 2003

1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x

DRAFT

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.