CopperOptics PairGain PG-Flex FCS-718, Manual, Page: 26 / 30

Section 363-718-104 Mya 30, 1997 Revision 01
Page 24 PairGain Engineering - Plant Series PG-Flex FCS-718
8.5 Composite Clock. When required, connect the composite clock (Figure 8). 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 primary composite clock leads from the master clock source in the CO to CC1_TIP
and CC1_RING termination pins on the backplane.
2 Connect the secondary composite clock leads from the master clock source in the CO to
CC2_TIP and CC2_RING termination pins on the backplane.
When using a List 2 or higher FPI-729 PGTC interface card with a List 4 shelf,
terminate the composite clock by attaching resistors across the CC1 Tip and
Ring wire-wrap pins and the CC2 Tip and Ring wire-wrap pins as described in
step 3.
3 For a List 2 or higher FPI-729 PGTC interface module, wire-wrap a 130 to 135
Ω
resistor on the
CC1 Tip and Ring pins to terminate clock 1 (Figure 8). Wire-wrap a 130 to 135
Ω
resistor on
the CC2 Tip and Ring pins to terminate clock 2.
Figure 8. Connecting the Composite Clock and Alarms
8.6 Alarms. If external audible and/or visual alarm indications are required, connect the audible and
visual alarm leads from the CO alarm panel to the COT (Figure 8).