Huawei OptiX PTN 3900 Quick Installation Manual page 18

Packet transport platform of ptn series
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Installing and Routing cables
3
Installing and Routing Power Cables - Downward Cabling
Do not install or demount the power cable while the power is on. To avoid personal injuries, turn off the power
before performing the operations.
The signal cable, power cable and fiber should be routed and bundled separately. Connect these cables in
sequence: PGND cable > BGND power cables > -48 V power cables.
When the power cables are routed downward, the number of cables respectively routed on the two sides of
the cabinet should be the same. See the previous figure.
12

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