Symmetricom SSU-2000 User Manual page 246

Chapter 8 Output Module Reference Data
DS1 Line Retiming Unit (LRU)
Table 8-21. LRM Kits (Continued)
Dual DS1 LRU (13813302-004-0)
This kit adds two retiming circuits;
includes 23-inch rack mounting hardware.
Quad DS1 LRU (13813302-005-0)
This kit adds four retiming circuits;
includes 23-inch rack mounting hardware.
The DS1 LRU inserts timing on DS1 signals that are typically connected to both
sides of a DSX-1 panel in a Central Office. Side 1 of the DS1 re-timer provides "3R"
(Re-shape, Re-amplify, and Re-time) for the DS1 signal to a client Network
Element. When the LRU receives a DS1 data stream, it re-times the data with the
transmit clock signal. The clock signal is inserted into the DS1 line route between
two DS1 path-terminating elements. Side one is the direction in which timing is
applied. Side 1 contains the DS1 line performance reporting and AIS generator. AIS
is not generated when the port is set to Unused/Off. Side 2 provides "2R", which
Re-shapes and Re-amplifies (regenerates) the DS1 signal from the client Network
Element. Side 2 does not provide performance monitoring or AIS generation.
Note: Side 1 is the "3R" port, and is sometimes known as East. Side
2 is the "2R" port, and is sometimes known as West.
The LRM is installed into an SSU-2000 plug-in module slot and is configured as an
output. The CTA plugs into the LRM's corresponding rear panel connector and
provides a path for the DS1 signal if the unit loses power, or if the main re-timing
module is removed.
installation configuration.
246 SSU-2000 User's Guide
Kit
Figure 8-21 illustrates Symmetricom's recommended
Contents
1 each Dual LRM (23413301-000-0)
1 each Dual CTA (22013300-000-0)
1 each Wire-wrap label (12213299-000-1)
1 each cable 805SCSITLCO
Wire-wrap Panel 799PE3020081
Dwg WW mod 11913299-000-2
1 each Quad LRM (23413301-001-0)
1 each Quad CTA (22013300-001-0)
1 each Wire-wrap label (12213299-001-1)
1 each cable 805SCSITLCO
Wire-wrap Panel 799PE3020081
Dwg WW mod 11913299-000-2
12713020-002-2 Revision F.01 – January 2007