12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 187
CPU, Frame Generator, and Clock Modules
T1/E1 Frame Generator Module with SSM
Table 6-13
describes the front panel status indicators (LEDs) on the T1/E1 Frame
Generator Module.
Functional Description
Refer to
Figure 6-7
for the following functional discussion. The T1/E1 Frame
Generator combines the functions of the T1/CC Frame Generator
(23476568-
xxx
-0), the CEPT Frame Generator (23477799-
xxx
-0), and the T1/E1
Frame Generator (23478305-xxx-0), into one module with the addition of CEPT
SSM. Two timing outputs and two clock signals are provided, making it possible for
the TSG-3800 to simultaneously output T1/E1, T1/CC, or E1/CC timing signals. In
addition, this module supports SSM on the DS1-FSF and E1 outputs.
The T1 output is derived from an 18.528 MHz reference signal from the
corresponding Clock module in the main shelf. The reference signal is divided to
1.544 MHz and sent to the DS1-D4/ESF Format Generator. This circuit produces
balanced TTL level signals that represent a framed, all ONEs DS1 signal. A rocker
switch on the module determines the framing format used (D4 or ESF).
Figure 6-7.
Block Diagram of the T1/E1 Frame Generator with SSM
Table 6-13. T1/E1 Frame Generator Module Status Indicators
Indicator
Color
Description
POWER
Green
On = Module is receiving power.
FAULT
Red
On = Module failure.
Blinking = Module is disabled.
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