Input Modules
Composite Clock Input Module
142
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
Figure 5-2.
Block Diagram of the Composite Clock Input Module
A loss-of-signal detector circuit monitors for signal presence. Should the signal be
lost, the front panel LOS indicator is lit.
The main shelf supplies –48 V input power to the module. A regulator converts the
input power to the required levels. When receiving power, the Power indicator is lit.
Specifications
Table 5-2
lists specifications for the CC Input module.
Table 5-2. Specifications, Composite Clock Input Module
Signal Characteristics
Specification
Frequency
64/8 kb/s
Waveshape
Rectangular, AMI
Amplitude
2.7 to 5.5 V base to peak (3 V nominal)
Error Threshold (LOS)
0 to 255 intervals per hour
Input Impedance
133
Ω
±
5% resistive
Monitor
Bantam jack, 860
Ω
isolation
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