Avaya 555-233-116 manual Stratum 3 clock wiring installation procedure, BL/1, BL-W/2

Set clock options

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.

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)

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 20.	Y-cable clock-end cross-connects for reliability
			To Y-cable clock end		To Y-cable clock end
From Stratum 3 Clock			(primary)		(secondary)
Lead		Lead Color/	Lead	Lead Color/	Lead	Lead Color/
Name		Terminal	Name	Terminal	Name	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

555-233-116 Issue 4 October 2002 167