Performing An External Loopback Test; Performing An Internal Loopback Test - Nortel Passport 8600 Configuring

102 Chapter 4 Configuring and graphing ports

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.
Note:
8672ATME/ATMM Modules.
Note:
To perform an external loopback test on a port:
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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.
314723-D Rev 01
For information about performing F5 loopback testing, see Using the
You must supply the loopback connector.
Plug in an external loopback connector.
From the Device Manager menu bar, choose Edit >Port.
The Port dialog box opens with the Interface tab displayed
page 81).
Set AutoNegotiate to false.
Set Admin Duplex to full.
Click the Test tab.
The Test tab opens (Figure 30 on page
Click Ext. Loopback.
Let the test run for several seconds.
Click Stop to stop the test.
The result, Fail or Success, is shown along with packet counts.
(Figure 20 on
100).