Cisco ASR 903

The other end of the cable has two 50-pin Telco connectors that attach to the rear of a 24-port RJ45 patch
panel. Both connectors are identical: one is for Transmit (TX) and the other is for Receive (RX).
Figure 35: 16 x T1/E1 Cable Connector
The figure below shows how the cable is connected between the 16 x T1/E1 interface module and the patch
panel.
Figure 36: Cable Installation between 16 x T1/E1 Interface and Patch Panel
Patch panel interfaces1
For information about the pinout of the cable connecting the T1/E1 interface to the rear of the patch panel,
see the T1/E1 Port Pinout .
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
58
Installing the Cisco ASR 903 Router
Connecting T1/E1 cables