Chapter 8 Output Module Reference Data
DS1 Output Module
194 SSU-2000e User’s Guide 12713140-002-2 Revision E – October 2006
DS1 Output Module
This section provides user-reference data for the DS1 Output module (part number
23413017-000-0) used in both the SSU-2000e main chassis and in the optional
SDU-2000e Expansion shelf.
Functional Overview
The DS1 Output module generates a phase-locked signal of 1.544 Mbps using one of
three 4 kHz clocks from the backplane of the SSU-2000e main shelf (A, B, and C
clocks). If the module is inserted into the SDU-2000e Synchronization Distribution Unit
(expansion shelf), a fourth 4 kHz clock (D clock) is available. The phase-locked signal
generates a set of 20 output signals for distribution to large networks. In addition, the
signal clocks the frame generator (or framer) for insertion of proper framing bits. A
simplified block diagram of the DS1 Output module is shown in Figure 8-3.
Figure 8-3. Block Diagram of the DS1 Output Module
The output SSM can be automatically set by the input signal or manually using an
ICS or TL1 command. See the SSU-2000e Technical Reference for details on
setting the output SSM.
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