Huawei OptiX PTN 3900 Quick Installation Manual page 22

Packet transport platform of ptn series
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Installing and Routing cables
6
Installing and Routing E1 cables - Upward Cabling
The printed pin assignment table of the E1 cable is attached in the package. Do not discard it before installation.
Cabling on the left is taken as an example and cabling on the right is similar.
When you route cables on one cabinet side, the E1 cables can be layered up three layers.
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