Transcend-information III User Manual download pdf (Page 53)

Starting the Diagnostic Program 5-5

Running the Group 2 Test

The Group 2 test is called the Network Loopback Test. It tests

the 3C592-COMBO adapter’s ability to transmit and receive

data via the internal transceiver. This test requires installation of

a loopback plug at the adapter’s BNC transceiver connection.

Or, you can run the test on a nonproduction network on which

only the computer being tested is operating.

CAUTION: Running the Group 2 test while connected to an

active network can cause intermittent failures.

Assembling a Loopback Plug

If you do not have a loopback plug, you may be able to get

one from your authorized network supplier, or you can make

your own. To assemble the loopback plug, connect two

50-ohm network cable terminators to a T connector, as

shown in Figure 5-2. You can purchase the terminators from

your network supplier (3Com part number 3C535).

Figure 5-2 Assembling a Loopback Plug

Starting the Group 2 Test

To run the Group 2 test on a 3C592 EISA adapter, follow

these steps:

1 Connect the loopback plug to the round BNC connector

on the back of the adapter.

2 Start the Conﬁguration and Diagnostic Program, as

described earlier in this chapter.

Terminator

T connector

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Transcend-information III User Manual Page 53