Group 2 And Group 3 Test Setup; Group 2 Test; Connecting A Loopback Plug - 3Com EtherLink 3C509B User Manual

7-12 Performing Troubleshooting and Diagnostic Tests

Group 2 and Group 3 Test Setup

To run the Group 2 and Group 3 diagnostic tests, you need:
The EtherDisk diskette.
Loopback plug for the Group 2 test. If you are testing
the 3C509, 3C509-COMBO, or 3C579 adapter, you
can use a coax loopback plug or connect to an inactive
network. The plug can be ordered from 3Com. There
are no loopback tests for TP adapters.
A second computer set up as an echo server for the
Group 3 test.
CAUTION: Do not use an active network to run the
Group 2 or Group 3 tests.

Group 2 Test

The Group 2 test is called the Network Loopback Test.
It tests the adapter's ability to transmit and receive data
over the network. This test requires installation of a
loopback plug at the adapter's transceiver connection.
Or, you can run the test on an inactive network.

Connecting a Loopback Plug

Follow these steps:
1. Connect the loopback plug to the round BNC
connector on the back of the 3C509,
3C509-COMBO, or 3C579 adapter.
2. Enable the Group 2 test from the Test Setup
dialog box. Highlight <OK> and press [Enter].
3. Go to the Run dialog box to start the tests.