Setting The Shelf Address - Symmetricom SSU-2000e User Manual

Chapter 2 Installing the SSU-2000e
Installing the SDU-2000e
SDU-2000e Interface Connector
Connection to the SSU-2000e is made through the SDU Interface Connectors. The
SDU Interface Connections, J103 and J105, are 25 Pin D-Type female connectors
with locking posts. The signals are differential pairs and connected in parallel. One
connector is used to connect to a source unit, and the other is used for either a
terminator or for feeding an additional SDU-2000e shelf. Up to four SDU-2000e
shelves can be daisy-chained together. See Figure 2-14 for expansion unit cabling.
Figure 2-14 shows an SSU-2000e Expansion Terminator (part number
12013049-000-0). Install this terminator to the last expansion chassis in the daisy
chain.
Figure 2-14. SSU-2000e Expansion Terminator
SDU Backup Clock Terminal
The SDU Backup Clock terminals (J104 and J106) are 9 pin D-type female
connectors labeled SDU BACKUP CLK. They are connected in parallel. If the SDU
is first in the daisy chain, J104 is used to connect to a source unit (SSU-2000e) and
J106 is used to connect to an additional SDU-2000e shelf.
Install the backup clock terminator on the SDU BACKUP CLK connector J106 on
the last expansion chassis in the daisy chain, see Figure 2-15.
Figure 2-15. Backup Clock Terminator, Side and Front View

Setting the Shelf Address

Each SDU-2000e expansion chassis must be correctly configured for its position in
the daisy chain. The shelf address selector is located on the top center of the
expansion chassis connector panel, see Figure 2-16. The settings range from 2 to
5. Using a common screwdriver, set the first expansion chassis to 2. If more
expansion chassis are added, set them sequentially up to 5.
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