User's Manual Part 3

Module Front Panel LED Indicators and Connectors – continued

Apr 2001

6-23

SC4812ET BTS Optimization/ATP — CDMA LMF

DRAFT

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 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.