Huawei OptiX PTN 3900 Quick Installation Manual page 23

Packet transport platform of ptn series
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Installing and Routing cables
6
Installing and Routing E1 Cables - Downward 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.
In the case of the ETSI 300 mm-deep cabinet , 64 cables (8×E1) can be routed to the two sides of the cabinet.
That is, on each side of the cabinet, a maximum of 32 cables (8×E1) can be routed (in the case of three-layer
bundling, 11 columns are required).
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