Справочник Пользователя для 3com SuperStack II

8 Start 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:

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

9 Stop the DLTest by entering:

10 Disconnect the call by entering:

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

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

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

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

V.54 compliant

device

CSU/DSU port