Performing Loopback Tests 135
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:
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
9 Stop the DLTest by entering:
DLTest Abort
10 Disconnect the call by entering:
HangUp !3.2
11 Change the port owner from loopback to PPP by entering:
SETDefault !3 -PORT OWNer = PPP
SETDefault !4 -PORT OWNer = PPP
12 Delete 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
device
CSU/DSU port
