Input Modules; Clock Modules - Symmetricom TSG-3800 Series User Manual

Overview of the TSG-3800 Series
Functional Description
The microprocessor performs all measurement, data processing, and control
operations. It continuously checks for any module or system condition that exceeds
alarm thresholds. If an alarm condition exists, the processor triggers the alarm
relays and takes corrective action. The processor automatically reports faults
through the EIA-232 ports. The operator can disable automatic event reporting. This
is useful when an automatic collection of measurements is desired without event
reporting interrupting them.
The TSG-3800 is shipped with operating settings at factory default values. As the
operator specifies new limits, the TSG-3800 stores them in non-volatile memory.
These settings remain until changed or the operator directs the TSG-3800 to return
to default values.
a column where the operator can note new settings.
System operating limits and functions are operator-programmable. The TSG-3800
has two EIA-232 ports for connection to peripheral devices. Cable connections to
the TSG-3800 are described in

Input Modules

Up to four Input modules can be installed in the TSG-3800 main shelf. Each Input
module supports a different type of signal, such as Composite Clock, DS1, or E1.
These modules measure the difference between the incoming signal and the
signals generated by the Clock module(s) in the main shelf. The Input modules can
be any combination of the available types. See
information on the Input modules available for the TSG-3800 series.

Clock Modules

One or two Clock modules in the TSG-3800 main shelf provide an internal reference
for measuring the incoming input signals. The CPU module locks the clock to the
selected input. If the input signal is not available, the clock enters the Holdover
mode and the output signals are maintained at the last valid setting. See
CPU, Frame Generator, and Clock
modules available for the TSG-3800 series.
The Clock modules provide the internal reference signals for generating the output
timing signals. They are also the back-up timing sources if the reference input
signals are lost. Clock modules may be of different types, allowing for lower cost
option for the secondary module, which is only used when the primary module is out
of service.
The frequency of each clock is locked to a valid reference input signal. A valid input
signal is one that is free from input faults while meeting acceptable frequency and
MTIE specifications. Current selections for internal clock oscillators are Rubidium
Stratum 2E and Quartz Stratum 3E.
34 TSG-3800 User's Guide
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Table 3-6 and Table 3-7
Chapter 2, Installing the
Modules, for more information on the Clock
list the factory default settings and provide
TSG-3800.
Chapter 5, Input Modules, for more
12778474-002-2 Revision F – March 2004
Chapter 6,