Cisco ASR 903 Installation Guide

RJ45 Cable Pinouts
T1 lines from individual subscribers are attached to RJ45 connectors on the front of the 24-port patch panel.
Each RJ45 port accommodates an individual T1 subscriber line.
For the T1/E1 ports, see Troubleshooting.
Connecting Cables to the Patch Panel
Figure 88: Interface Module with the Connector
Figure 89: Patch Panel with the Connector
If you are connecting two T1/E1 interfaces to each other, you must cable both interfaces’ patch panels together
using a T1 cross-over cable or a T1 straight-through cable. Use shielded cables. The type of cable you use
(cross-over or straight-through) depends on how the T1/E1 interfaces are cabled to their patch panels:
• If both T1/E1 interfaces are connected to their patch panels in the same manner (TX to Transmit and RX
to Receive, or TX to Receive and RX to Transmit), use a T1 cross-over cable to connect the patch panels.
• If both T1/E1 interfaces are connected to their patch panels in a different configuration (TX to Transmit
and RX to Receive on one interface, and TX to Receive and RX to Transmit on the other interface), use
a T1 straight-through cable (standard RJ45 patch cable) to connect the patch panels.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Installing the Cisco ASR 903 Router
RJ45 Cable Pinouts

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English