Cisco 2500 Series Installation And Configuration Guide

Step 4 Connect one end of each asynchronous/synchronous cable to the asynchronous/synchronous ports
(labeled Serial n (A/S)), and then connect the other end to a CSU/DSU or asynchronous device. (See
Figure 3-14.)
For asynchronous/synchronous port pinouts, refer to the appendix "Cable Specifications."
Figure 3-14: Connecting Asynchronous Serial Cables
Step 5 Connect the ISDN BRI port (RJ-45) to an NT1 device. (See Figure 3-15)
Figure 3-15: Connecting the ISDN BRI Port to an NT1 Device
Installing the Router
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Cisco 2500 Series Specifications

General

Brand	Cisco
Model	2500 Series
Category	Controller
Language	English