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This section describes how to perform a loopback test on a 56/64 Kbps 
CSU/DSU module.

Figure 12 shows the data flow that occurs when this loopback test is 
performed.

Figure 12   CSU/DSU Module Loopback Testing

Before running the loopback test, complete the following tasks:

■

Attach a console or Telnet to your bridge/router.

■

Cable the CSU/DSU module to the network.

■

Verify the path and port number of the port you are testing.

The remote loopback test includes remote CSU Loopback and remote 
DSU Loopback.

To perform a remote loopback test, follow these steps:

1 Set the baud rate of the port. The default setting of the Autobaud feature 

is ON. You can turn off autobaud by setting the baud rate. For example, 
to set the baud rate to 64 Kbps, enter:

To turn on autobaud, enter:

2 Enable the port by entering:

CSU/DSU Module

Line
Act
Line
Error

Link

Connect

Fault

Send

Active

Fault

Line

Active

Fault

Run

Load

Test

B1      B2

Status

Pwr            Fwd

Alert