Ssu-2000E Configured As A Monitor-Only System - Symmetricom SSU-2000e User Manual

SSU-2000e Configured as a Monitor-Only System

The SSU-2000e can also be configured as a monitor-only system
which one of the inputs is designated as the reference, and a clock module is locked
directly to this signal. The remaining input signals are then compared to the
phase-locked oscillators (and indirectly to the designated input reference).
The SSU-2000e continuously monitors incoming timing signal integrity. The
operator defines input acceptance criteria and sets parameters for alarming. If the
incoming signal is acceptable (within the performance limits set by the operator), the
SSU-2000e phase-locks to the signal on a priority basis.
Figure 1-4. SSU-2000e Configured as a Monitor Only System
System Architecture
The SSU-2000e system is a Timing Signal Generator that controls, monitors,
generates, and distributes network synchronization signals. The I/O signals can be
DS1, E1, Composite Clock (CC), sinusoids, or square waves. The SSU-2000e
continuously monitors incoming timing signal integrity. The operator defines input
acceptance criteria and sets parameters for alarming. If a reference signal is
acceptable (within the performance limits set by an operator), the SSU-2000e
frequency-locks to the signal on a priority basis. System holdover and filtering
performance is dependent on the quality of oscillators used in the SSU-2000e's
internal clock modules (Stratum 2E or Stratum 3E).
A selection of hot-swappable modules and system software allow users to easily
configure, upgrade, or expand the SSU-2000e system to meet a variety of
telecommunications synchronization application requirements. Modules can be
inserted or removed from the SSU-2000e while the system is operational without
degradation of output signals. Each module supports the management of critical,
major, and minor alarms. Output modules and clock modules can be configured in
redundant pairs for increased reliability.
A simplified system block diagram for the SSU-2000e is shown in
12713140-002-2 Revision E – October 2006
Chapter 1 Product Overview
System Architecture
(Figure 1-4) in
Figure 1-5.
SSU-2000e User's Guide 23