3Com NETBuilder SI, SuperStack II manual To turn on autobaud, enter, Enable the port by entering

Performing Loopback Tests 139

Performing a Remote

Loopback Test on a

56/64 Kbps CSU/DSU

Module

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

CSU/DSU Module

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:

1Set 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:

SETDefault !3 -PAth BAud=64

To turn on autobaud, enter:

SETDefault !3 -PAth BAud=AUto

2Enable the port by entering:

SETDefault !3 -PAth CONTrol=ENable