Avaya 555-233-116 사용자 설명서

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Set clock options
Issue 4   October 2002
167
555-233-116
Stratum 3 clock wiring installation procedure
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 the 
table below.
5. For standard reliability systems, refer to Y-cable 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 table below to cross-connect 
the TN780 and “CLOCK” end connections to the Stratum 3 clock 
connections on the cross-connect module.
Table 19.
Maximum cabling distance for different CSUs
Channel Service Unit (CSU)
Maximum Cabling Distance
551A
85 feet (27 m)
551V
85 feet (27 m)
551V EFS/R
755 feet (199.7 m)
EFS T1
755 feet (199.7 m)
Table 20.
Y-cable clock-end cross-connects for reliability
From Stratum 3 Clock
To Y-cable clock end 
(primary)
To Y-cable clock end 
(secondary)
Lead
Name 
Lead Color/
Terminal
Lead
Name 
Lead Color/
Terminal
Lead
Name 
Lead Color/
Terminal
RREF1
W-BL/1
V-O/43
TREF1
BL-W/2
O-V/44
RREF2
W-O/3
V-O/43
TREF2
O-W/4
O-V/44