Installing the Stratum 3 Clock
Task List: Install the Stratum 3 clock
698
SI Installation and Upgrades
June 2004
Install the Stratum 3 Clock Wiring
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1
Connect the B25A cables from the TN780 connector panel slot on the system cabinet and the
Stratum 3 Clock to the cross-connect module in the yellow field.
2
Connect the CSU plug end of the H-600-274 (Y) cable to the primary CSU. Route an H600-307
cable from the DS1 connector panel slot on the system cabinet to the connector on the
“SYSTEM” end of the “Y” cable.
3
Route a B25A cable from the “CLOCK” end of the “Y” cable to the cross-connect module in the
yellow field.
4
Repeat steps 2 and 3 for the secondary CSU. The maximum allowable cabling distance between
the Stratum 3 clock and the CSU is shown in
Maximum Cabling Distance
on page 698.
5
For standard reliability systems, refer to
Cross-Connects for Standard Reliability
on page 698 to
cross-connect the TN780 and “CLOCK” end connections to the Stratum 3 Clock connections on
the cross-connect module.
6
For high or critical reliability systems, refer to
Cross-Connects for High or Critical Reliability
on
page 699 to cross-connect the TN780 and “CLOCK” end connections to the Stratum 3 Clock
connections on the cross-connect module.
7
The common cross-connection from the TN780 in A and B carriers to the Stratum 3 Clock should
be done by bridging the jumper wires.
8
Dress the cables down sides of the cabinet and run through the Cable Slack Manager, if provided.
9
Administer using the Administrator’s Guide for Avaya Communication Manager (555-233-506).
Maximum Cabling Distance
Channel Service
Unit (CSU)
Maximum Cabling
Distance
551A
85 Feet (26 m)
551V
85 Feet (26 m)
551V EFS/R
655 Feet (199.6 m)
EFS T1
655 Feet (199.6 m)
Cross-Connects for Standard Reliability
From: Stratum 3 Clock
To: Y Cable Clock End (Primary)
Lead
Designation
Lead
Color
Connecting
Block
Terminal
Lead
Designation
Lead
Color
Connecting
Block
Terminal
RREF1
W-BL
1
V-O
43
TREF1
BL-W
2
O-V
44
To: Y Cable Clock End (Secondary)
RREF2
W-O
3
V-O
43
