ADC FCS-717 4B, Technical Practice, Page: 29 / 40

SCP-FCS717-042-03H Installation and Test
FCS-717 List 4B January 6, 2003 19
Composite Clock
When required for digital services, connect the composite clock as shown in Figure 9 (refer to Table 12 for
composite clock terminations and functions). You can cascade the composite clock to other PG-Flex shelves.
When cascading the composite clock to other PG-Flex shelves, terminate only on the last shelf in the cascade.
1 Connect the composite clock leads from the primary master clock source in the CO to CC1_TIP and
CC1_RING wire-wrap pins on the backplane.
2 Connect the composite clock leads from the secondary master clock source in the CO to CC2_TIP and
CC2_RING wire-wrap pins on the backplane.
3 When cascading the composite clock to other PG-Flex shelves, install a jumper from CC1_TERM to
CC1_TIP and from CC2_TERM to CC2_TIP only on the last shelf in the cascade.
Figure 9. Connecting the Composite Clock and Alarms
If the composite clock is connected, it must be terminated by connecting a jumper
from CC1_TIP to CC1_TERM wire-wrap pins, and from CC2_TIP to CC2_TERM
wire-wrap pins on the last shelf in the cascade.
CC1
RING
CC2
RING
P28
P27
P21
NO COM NC
VIS
MIN
MIN
P22
AUD
MAJ
MAJ
CRIT
VIS
AUD
SHELF
ID
CC1
TIP
CC2
TIP
CC1
TERM
CC2
TERM