3Com NETBuilder SI, SuperStack II manual Start the DLtest using, Stop the DLTest by entering

Performing Loopback Tests 135

8Start the DLtest using:

DLTest Start <sendingport>, <receivingport>

To start the DLTest and designate port 4 to send the DLTest data and port

3 to receive and loop back the data, you would enter:

DLtest START 4,3

The loopback test is successful when the number of received packets equals or approximately equals the number of transmitted packets. If the test is not successful, verify that your bridge/router is cabled and installed correctly. You can check the number of packets transmitted and the number of errors using:

DLTest Stat

9Stop the DLTest by entering:

DLTest Abort

10Disconnect the call by entering:

HangUp !3.2

11Change the port owner from loopback to PPP by entering:

SETDefault !3 -PORT OWNer = PPP

SETDefault !4 -PORT OWNer = PPP

12Delete the phone number from the dial number list for port 4 using:

DELete !4 -PORT DialNoList “<phone no>”

Performing a V.54 Loopback Test on the CSU/DSU Port (45x and 55x)

This section describes how to perform a V.54 loopback test on the built-in 56/64 Kbps CSU/DSU on the model 45x and 55x bridge/router.

Figure 10 shows the data flow that occurs when this loopback test is performed.

Figure 10 CSU/DSU V.54 Loopback Testing

Telco

service

V.54 compliant

CSU/DSU port

device