Revision E – October 2006 Ssu-2000E User's Guide - Symmetricom SSU-2000e User Manual

Chapter 1 Product Overview
SDU-2000e Synchronization Distribution Unit
Power Input and Grounding
The SDU-2000e expansion chassis has redundant –48/60 VDC power input
connections, labeled A-BUS and B-BUS (J101 and J102). Both the A-BUS and
B-BUS are fed to the individual module slots through the chassis backplane.
Figure 1-16. SDU-2000e Connection Features
Expansion Connectors
Up to four SDU-2000e expansion shelves can be attached to the SSU-2000e main
shelf. The two terminators (SSU Expansion Terminator and SDU Backup Clock
Terminator) must be moved from the SSU-2000e chassis (connectors J8 and J9) to
connectors J105 and J106, respectively, on the last expansion chassis in the daisy
chain. A simplified expansion cabling diagram is shown in Figure 1-17.
Output Module Redundancy Configurations
For each A/B pair of Output modules, the outputs of module B are connected to the
corresponding outputs of module A. This provides for 1:1 output protection (1:1
redundancy).
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