Nortel 8100 用户指南
102
Chapter 4 Configuring and graphing ports
314723-D Rev 01
Performing an external loopback test
An external loopback test uses a loopback connector connected to the port to loop
data back to the same port.
data back to the same port.
To perform an external loopback test on a port:
1
Plug in an external loopback connector.
2
From the Device Manager menu bar, choose Edit >Port.
The Port dialog box opens with the Interface tab displayed (
3
Set AutoNegotiate to false.
4
Set Admin Duplex to full.
5
Click the Test tab.
The Test tab opens (
).
6
Click Ext. Loopback.
Let the test run for several seconds.
7
Click Stop to stop the test.
The result, Fail or Success, is shown along with packet counts.
Performing an internal loopback test
During an internal loopback test, packets are looped back at the PHY device. No
connector is needed, as in the external loopback test, and you can run the test with
or without another device attached to the test port.
connector is needed, as in the external loopback test, and you can run the test with
or without another device attached to the test port.
Note:
For information about performing F5 loopback testing, see Using the
8672ATME/ATMM Modules.
Note:
You must supply the loopback connector.