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

The SDU Backup Clock terminals, labeled J104 and J106, are 9 Pin D-type female
connectors that are connected in parallel. Connector J104 is used to connect to a
source unit, such as the SSU-2000e or to connector J106 on another expansion
shelf. Connector J106 drives an additional SDU-2000e shelf, or it is terminated
using an SDU backup clock terminator.
When installing an expansion chassis, move the clock terminator from J9 on the
SSU-2000e, or connector J106 from a previous SDU-2000e expansion chassis, and
install the terminator on J106 of the last expansion chassis in the daisy chain, see
Figure 1-15.
Figure 1-15. Backup Clock Terminator, Side and Front Views

Setting the Expansion Shelf Address

Each SDU-2000e expansion chassis must be correctly configured for its position in
the daisy chain. The main shelf's address is 1. The SDU shelf address selector is
numbered from two to five. Set the first expansion shelf address to 2. Set the
address on additional shelves sequentially, as shown in
Table 1-10. Expansion Shelf Addressing
Shelf
Main Shelf
Expansion Shelf 1
Expansion Shelf 2
Expansion Shelf 3
Expansion Shelf 4
Buffered Clocks
The signals that are provided by the main shelf Clock modules to the Buffer
modules in the expansion shelf are isolated versions of the signals used by the
Output modules in the main chassis. This prevents the expansion shelf and its
cabling from affecting the outputs of the main shelf.
12713140-002-2 Revision E – October 2006
Address
1
2
3
4
5
Chapter 1 Product Overview
SDU-2000e Synchronization Distribution Unit
Table 1-10.
SSU-2000e User's Guide 53