Frame Generator Modules; Output Modules - Symmetricom TSG-3800 Series User Manual

Overview of the TSG-3800 Series
Functional Description
The TSG-3800 controls clock frequency by adjusting an internal control value. The
CPU module uses the phase measurements between the selected input signal and
the clock signals to calculate each oscillator's control value. The control value is
also adjustable by the operator while the Clock module is in Holdover. The control
value setting is held in each Clock module for operation without the CPU module.

Frame Generator Modules

The Frame Generator modules in the TSG-3800 main shelf produce timing signals
used by the Output modules to generate the various outputs they produce. See
Chapter 6, CPU, Frame Generator, and Clock Modules, for more information on the
Frame Generator modules available for the TSG-3800 series.
The TSG-3800 Main Shelf accepts one or two Frame Generator modules. These
modules produce formatted timing signals to drive the distribution modules. One
Frame Generator module must accompany each Clock module. With two Frame
Generator modules and a Clock module pair, the TSG-3800 synchronizes their
outputs providing a minimal phase change of 25ns on switch-over between
redundant modules. The T1/E1 Frame Generator Module provides two outputs and
two clocks. Output 1 is either a framed T1 or a framed E1 signal. Output 2 can be
set for framed E1 (2048 kbps) or Composite Clock (64/8 kHz) signals. The two clock
output signals can be individually set to either 1.544 MHz, 2.048 MHz, or 8 kHz.

Output Modules

Symmetricom provides a variety of Output modules that create the signals
distributed to network elements. When paired with a second Output module of the
same type, each module provides 20 one-for-one redundant output signals. The
3800/3800E 19-inch main shelf supports four Output modules for a total of 40
redundant output signals; the 3800 23-inch main shelf supports eight Output
modules for a total of 80 redundant output signals. See Chapter 7, Output Modules,
for more information on the Output modules available for the TSG-3800 series.
Different types of Output module pairs may be used, dependent only on the signals
provided by the frame generators selected.
12778474-002-2 Revision F – March 2004 TSG-3800 User's Guide 35
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