3Com NETBuilder SI Using Manual page 134

134 A A: T
PPENDIX ROUBLESHOOTING
To perform a loopback test on the built-in ISDN port, follow these steps:
1 Assign each path to separate ports, if necessary, by entering:
ADD !3 -PORT PAths 3.1
ADD !4 -PORT PAths 3.2
2 Set the rate adaption parameter to automatically detect the speed of the
sending interface using:
SETDefault !<connectorID.channelID> -PAth RateAdaption = Auto
In the example shown in Figure 9, the test originates from path 3.2 and
targets 3.1. To specify path 3.2, enter:
SETDefault !3.2 -PAth RateAdaption = Auto
3 Configure the ports for loopback testing by entering:
SETDefault !3 -PORT OWNer = Loopback
SETDefault !4 -PORT OWNer = Loopback
4 Add the phone number of path 3.1 to the dial number list of port 4
using:
ADD !4 -PORT DialNoList "<phone no>" Baud=64 Type=Bri Pos=1
5 Establish a connection between the two B channels by dialing out on one
channel and dialing into the other using:
DIal !<path>
To dial path 3.1 from path 3.2, enter:
DIal !3.2
Path 3.2 places a call to the number configured in step 4, which is the
number for path 3.1. It is not important which port originates or answers
the call as long as the port does not try to call itself.
6 When the connection is successfully established, select the loopback
testing mode by entering:
DLTest TestMode Loopback
7 You can specify the number of seconds the test should run. Enter this
value any time before entering the DLTest START command. If a value is
not specified, an infinite time duration is assumed. To run the test for a
specific number of seconds, use:
DLTest TestDuration <seconds>
Use caution when running for a specified test duration. The test ends
abruptly as soon as the time duration expires and a discrepancy between
the number of packets transmitted and the number received may result.