Sdu-2000E Expansion Chassis Components - Symmetricom SSU-2000e User Manual

Chapter 1 Product Overview
SDU-2000e Synchronization Distribution Unit
Clock Source
The clock inputs for the first SDU-2000e expansion chassis in an SSU-2000e
system are supplied by the A and B Clock modules in the main chassis. A multi-pin
connector on the front panel of the SSU-2000e (labeled J8 EXPANSION) provides
the reference signals from the main shelf Clock modules for use by the SDU-2000e
expansion shelves.
Figure 1-14. SDU-2000e Expansion Chassis Components
SDU Backup Clock
For redundancy, a backup clock, labeled SDU BACKUP CLK, is supplied to each
expansion chassis to allow each expansion chassis to continue operating if the
main expansion bus (cable) is accidently disconnected or dislodged.
52 SSU-2000e User's Guide 12713140-002-2 Revision E – October 2006