Ssu-2000 Family Of Modules - Symmetricom SSU-2000 User Manual

Product Overview

SSU-2000 Family of Modules

A user interface (software residing in the Communications module) provides various
levels of password-protected access for configuration, detailed performance
monitoring, and diagnostics. Refer to
more information on configuration and detailed performance monitoring. Remote
EIA-232-C ports can be assigned their own interface type, either Interactive Command
Set (ICS) or TL1 that is retained in NVRAM. The Local port (Port C on the
Communications module) is always in ICS mode when the Communications module
restarts.
Main Shelf Power Connections
The SSU-2000 main shelf contains provisions for connecting redundant –48 vDC
external power inputs (designated A and B input power). The power supplies,
located on the internal modules, can accept input power in the range of –37 to
–72 vDC.
Each power input to the main shelf is accomplished using a 2-connection terminal
strip, with the negative side fused. Both connections are isolated from frame and
signal grounds.In the event of the loss of either the A or B input, the system senses
the loss of power, reports the loss of the power input and continues normal
operation on the remaining power input. If both power supply inputs are lost, the
Critical Alarm relay de-energizes to the alarm state and a Critical alarm is reported.
Main Shelf Frame/Logic Grounds
Screw type lugs on the rear of the shelf are used for logic and shelf ground
connections. Grounding for integrated or isolated ground planes are supported by
two user-configured hardware straps.
SSU-2000 Family of Modules
The SSU-2000 family of modules includes the following:
Stratum 2E Clock Module
Stratum 3E Clock Module
Type 1 Clock Module
Communications Module
1-Port and 3-Port E1 Input Modules
1-Port and 3-Port DS1 Input Modules
GPS Input Module
2048 kHz Output Module
RS-422 Output Module
E1 Output Module
DS1 Output Module
Composite Clock Output Module
42 SSU-2000 User's Guide
Appendix B, Communications Protocol,
12713020-002-2 Revision D – April 2004
for