Setting The Expansion Shelf Address; Buffered Clocks; Sdu Module Features; Expansion Shelf Addresses - Symmetricom SSU-2000 User Manual

Chapter 1 Product Overview
SDU-2000 Synchronization Distribution Unit

Setting the Expansion Shelf Address

Each SDU-2000 Expansion shelf 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 1-3. Expansion Shelf Addresses
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 shelf. This prevents the expansion shelf and its cabling
from affecting the outputs of the main shelf.

SDU Module Features

The SDU-2000 expansion shelf supports all Output modules available for the main
shelf, and Buffer modules. The SDU-2000 expansion shelf can support up to 14
Output modules.
One or two Buffer modules, assigned to slots A15 and A16
One to 14 Output modules; a mixture of Output module types, where each group
of two modules must be identical
The last two module slots in the expansion shelf, labeled A15 and A16, contain the
Buffer modules that buffer the corresponding Clock and Communications modules
in the main shelf. The buffered signals from these modules are distributed through
the motherboard to the Output modules.
56 SSU-2000 User's Guide
Address
1
2
3
4
5
Table 1-3.
12713020-002-2 Revision F.01 – January 2007