Product Overview
SDU-2000 Synchronization Distribution Unit
52 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
The SSU-2000 handles SSMs in accordance with T1X1.3 TR33, T1.101-1999,
GR-253, and 379-CORE.
Indicators and Controls
All modules installed in the SSU-2000 main shelf and the SDU-2000 expansion
shelf contain status indicator lamps for displaying status. The LED indicators for
each module are described in Chapter 6, Clock Module Reference Data, Chapter 7,
Input Module Reference Data, and Chapter 8, Output Module Reference Data. In
addition, the Communications module collects status information from all installed
modules, sets the alarm relays, and sends communications status alerting users of
any Events that exceed alarm thresholds.
SDU-2000 Synchronization Distribution Unit
Up to four SDU-2000 Synchronization Distribution Units (expansion shelves) can be
attached to the SSU-2000 for output expansion (Figure 1-12 and Figure 1-13). Each
expansion shelf contains two Buffer modules and 14 output modules (can be a
combination of output modules). Four expansion shelves can hold up to 56 Output
modules capable of generating an additional 1120 synchronized clock outputs for
system distribution. Each expansion shelf is connected to the main shelf with
redundant clock cables to protect against cable faults.
Table 1-4. ITU SSM Quality Level Definitions
Description
Quality
Level
Abbreviation
Primary Reference Clock 2 PRC
Transit Node 4 SSUT
Local Node 8 SSUL
Synchronization Equipment Clock 11 SEC
Do Not Use for synchronization 15 DNU
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