Installation guide

6
Cisco Clock Module (WS-C6K-CL and WS-C6513-CL) and VTT Module (WS-C6K-VTT) Installation Note
78-10498-05
Replacing the VTT Modules and Clock Modules
Figure 1 VTT Module and Clock Module Location
Replacing the VTT Module
Note The manufacturing assembly number for the VTT modules on Catalyst 6500 series switches that were
shipped since December 2001 is 73-4354-02 Rev A0. If the VTT modules installed on your switch do
not have this manufacturing assembly number, you must replace all three VTT modules, regardless of
the failure.
If all VTT module manufacturing assembly numbers are 73-4354-02 Rev A0, replace only the failed
module.
Caution Always use an ESD wrist strap when handling modules or coming into contact with internal components.
A Catalyst 6509-NEB-A, Cisco 7609 (CISCO7609)
B Catalyst 6509-NEB, Cisco 7609 (OSR-7609)
C Catalyst 6513, Cisco 7613
D Catalyst 6006, 6009, 6506, 6509
1 VTT 1 4 Clock A (CLK A)
2 VTT 2 5 Clock B (CLK B)
3 VTT 3
CLK A
VTT 3
VTT 2
VTT 1
A
2
CLK A
CLK B
VTT 3
VTT 2
VTT 1
1
2
3
1
3
4
5
VTT 3
VTT 2
VTT 1
CLK B
CLK A
1
D
C
B
2
3
4
5
68426
CLK A
VTT 3
VTT 2
VTT 1
CLK B
2
3
1
4
5