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Cable installation 33
Model 3196RC T-DAC User Manual 2 • Hardware installation
Note
To synchronize the ForeFront system with a BITS clock, you must
connect the site BITS clock system to the EXT CLOCK connector
located on the rear-panel of the T-DAC WAN Access Module rear
card (see figure 13).
Figure 13. EXT CLOCK connector location
Do the following to connect the WAN Access Module card’s EXT CLOCK connector to the BITS clock:
1. The EXT CLOCK connector is a 3-pin terminal block connector (see figure 13). As you face the rear-
panel, pin 1 is located at the top (vertical card orientation) or left (horizontal card orientation). Table 6
lists the connector pinout.
2. Plug the connector on the end of the BITS clock cable into the EXT CLOCK connector. Tighten the cap-
tive screws to secure the connector.
Table 6. EXT CLOCK connector pinout
Pin Description
1 Negative input
2 Positive input
3 Chassis ground
WAN ACCESS MODULE
READY
ALARM
W
A
N
D
S
L
EXT CLOCK
EXT CLOCK connector
EXT CLOCK
Pin 1
Pin 3