Huawei OptiX OSN 2500 Quick Installation Manual page 38

5
E1/T1 Cables and E1/T1 Interface
a
E1/T1 interface
The T1 cables have the same outer view, pin assignment, and installation procedure as the 120-ohm E1
cables.
The printed pin assignment table of the E1 cable is attached in the package. Do not discard it before installation.
You can connect the DDF to the D75S board by using the 75-ohm E1 cable only, to the D12S board by using
the 120-ohm E1 cable only, and to the D12B board by using the 120-ohm or 75-ohm E1 cable.
E1/T1 interface board(D75S,D12S,D12B)
Pin 44
35
Pin 1
75-ohm 8xE1 cable
120-ohm 8xE1 cable