Functional Description; Indicators, G.703/9 Input Module - Symmetricom TSG-3800 Series User Manual

The module is selectable for:
Accepting a G.703/9 input in either CAS or CCS format.
Accepting a G.703/9 input in either HDB3 or AMI format.
Setting the input impedance for terminating the G.703/9 line, attaching to a
monitor point or providing a high impedance bridge.
Table 5-4 describes the indicators located on the front panel of the G.703/9 Input
Module.
Table 5-4. Indicators, G.703/9 Input Module
Indicator
POWER
REF
REM ALM
LOS
AIS
LOF
The G.703/9 input signal is available at the front panel MONITOR jack whenever an
input signal is present. This monitor is isolated from the input by 860 Ω.

Functional Description

Figure 5-4 is a block diagram of the G.703/9 Input Module, which extracts clock and
data from a G.703/9 input signal. A Frame Analyzer detects frame and superframe
alignment markers and examines the G.703/9 input for errors (BPV, LOS, AIS,
LOF).
A Phase Detector measures the phase between the G.703/9 input signal and the
system clock over a 1 second interval.
The Backplane Assembly supplies –48 V input power to the module. A regulator
converts the input power to the required levels. When receiving power, the front
panel POWER indicator is lit.
12778474-002-2 Revision F – March 2004
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Color
Green On = Power is applied
Green On = The oscillator is phase locked to the input
reference applied to this module
Amber On = A remote alarm is received
On = Loss of Signal. ≥ 32 consecutive zeros
Red
Red On = Alarm Indication Signal. < 3 zeros in the last
two multiframes read
Red On = Loss Of Frame
G.703/9 Input Module
Description
TSG-3800 User's Guide 145
Input Modules