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How to Use the Diagnostic Utility 6-7
Running the External Loopback Test
Run the External Loopback Test to check the integrity of the
on-board transceiver and cable connectors. To run the
External Loopback Test, you must use a loopback plug.
For instructions on constructing a loopback plug, see the
section “Constructing Loopback Plugs” later in this chapter.
CAUTION: Do not run the External Loopback Test when the
3C975 ATMLink NIC is cabled to another device.
To run the external loopback test only, perform the following
procedure:
1 Insert the loopback plug into the 3Com ATMLink NIC.
2 From the Select menu on the diagnostic utility main screen,
select the 3C975 ATMLink NIC to be tested.
The PCI slot number or the MAC address of the NIC identifies
the physical NIC being tested. The MAC address is a 12-digit
hexadecimal number on the small bar code label on the
component side of the NIC.
3 Select Test Setup from the Test menu.
The Test Setup screen appears, as previously shown in Figure 6-2.
4 Click Disable All to disable all internal tests.
5 In the Test Select Box, select Ext Loopback Test.
The External Loopback Test screen appears, as shown in
Figure 6-4.