CopperOptics 150-1619-11, Technical Practice, Page: 31 / 52

950-719-111-03, Revision 03 Installation and Test
PCS-719 List 1A June 29, 2000 25
Split Shelf Powering
In this configuration, one half of the shelf is powered from one –48 Vdc source, the other half is powered from
another –48 Vdc source. Common equipment circuit cards are powered from both sources. If one power supply
should fail, one-half of the shelf maintains power. Each –48 Vdc source should be fused according to
Table 22 on
page 20 and Table 23 on page 21 .
A four-position jumper is in place on the TB1 block. This jumper shorts all of the 48 VDC inputs together to
prevent an alarm condition when only one input feed wire is connected. To provide split shelf powering:
1 Ensure that the ground connection is in place.
2 Remove the four-position jumper (refer to Figure 7 on page 24 ) and discard.
3 Connect a wire from the –48A-LOW terminal of TB1 (see Figure 8 ) to the CO A battery supply at the fuse
panel.
4 Connect a wire from the –48B-HIGH terminal of TB1 to the CO B battery supply at the fuse panel.
5 Connect a wire from the Battery Return terminal in position 5 of TB1 to the CO A battery return at the fuse
panel.
6 Use a short jumper wire to connect the Battery Return terminal in position 6 of TB1 to the CO B battery return
at the fuse panel.
7 Use a short jumper wire to connect the –48 A-LOW and –48 B-LOW terminals of TB1. Make this connection
at the top of the terminal block as shown in
Figure 8 .
8 Use a short jumper wire to connect the –48A-HIGH and –48B-HIGH terminals of TB1. Make this connection
at the top of the terminal block as shown in
Figure 8 .
Figure 8. Split-Shelf Wiring