Symmetricom SDU-2000, User Manual

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Output Module Reference Data
Line Retiming Unit (LRU)
208 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Installing the Line Re-timing Unit
This section contains procedures for installing the Line Re-timing Module (LRM) and
the Cut-Through Assembly (CTA) in an SSU-2000 and in an SDU-2000.
Installing the Line Re-Timing Module in the SSU-2000
The SSU-2000 shelf has twelve plug-in module slots. The slots are numbered A1
through A12, from left to right looking at the front of the shelf. When you install a
Line Re-timing Module into an SSU-2000, Symmetricom recommends that you use
only slots A6, A7, A8, or A9 as shown in
Figure 8-19 . Using only the specified slots
allows you to maintain redundant configuration options on other modules.
PORT 1, 2, 3, and 4 Green/Amber On (Green) = Selected
On (Amber) = Not good and ignored
Off = Ignored or good and not selected
FAULT CTA Green/Amber On (Green) = CTA connected
On (Amber) = CTA not connected or CTA mismatch
Off = CTA not connected and alarm set to ignore
FAULT REF Green/Amber On (Green) = Clock reference selected
On (Amber) = Clock reference not selected
Note: You can install and remove modules while system power is
supplied without damaging modules or affecting system operation.
Caution: For continued EMC compliance, replace all deformed
module gaskets with the same type. Clean gaskets and mating
surfaces. Secure all modules with captive screws.
Table 8-16. DS1 LRU Module Status LED Indicators (Continued)
Indicator Color Description