Clock And Communications Modules - Symmetricom SSU-2000e User Manual

Some of the features common to each module include:
Any module can be inserted or removed while power is applied without affecting
the operation of other modules in the system.
All modules are individually fused to protect the system in case of a short circuit
on any one module.
All modules have status LEDs on their front panel.
All modules are equipped with ejector tabs for ease of installation and removal
and secured in place with captive screws to provide module security and reduce
the occurrence of unauthorized removal.
All SSU-2000e modules have an integrated CPU with firmware and are software
configurable.
Each module slot also has three pins connected together on its assigned hybrid
DIN connector which permits the system to detect when a particular module is
removed. More information is available for each of these modules in
Clock Module Reference
Chapter 8, Output Module Reference

Clock and Communications Modules

Stratum 2E Clock Module
The Stratum 2E Clock module uses a Rubidium oscillator and meets the ITU-T and
ETSI specifications for Type II Transit Node clocks. This clock also meets the
requirements of ANSI and Telcordia Industries (Bellcore) for Stratum 2 clocks.
The module reads measurement data from the input modules, provide frequency
control of its oscillator through DDS circuitry, and generates a reference signal used
by the input and output modules. The clock module also maintains phase
synchronization with the redundant clock module. For more information, see
Stratum 2E Clock
Stratum 3E Clock Module
The Stratum 3E Clock module meets or exceeds performance requirements for ITU
and ETSI Type III Local Node clocks and ANSI and Bellcore Stratum 3E.
The Stratum 3E Clock Module reads measurement data from the Input modules,
provide frequency control of the oscillators through DDS circuitry, and generates a
reference signal used by the Input and Output modules. The Clock module maintains
phase synchronization with the redundant Clock module. Its hardware and software
also provides for temperature compensation, aging compensation for quartz
oscillators, an initial offset adjustment, and frequency adjustment resolution of 1 x
-13
10 or better. For more information, see
Type I Clock Module
The Type I Clock module uses a quartz oscillator which meets or exceeds the
performance requirements for ITU and ETSI Type I Slave clocks.
12713140-002-2 Revision E – October 2006
Data, Chapter 7, Input Module Reference
Module, on page 142.
Data.
Stratum 3E Clock Module, on page 146.
SSU-2000e User's Guide
Chapter 1 Product Overview
System Components
Chapter 6,
Data, and
41