Constructing Loopback Plugs - 3Com EtherLink 3C985B-SX User Manual

Table 8 PCI BIOS Parameters
Parameter
Bus master
Interrupt number
Interrupt type
Latency timer
I
I
I
I

Constructing Loopback Plugs

To run the External Loopback Test, you must first
insert a loopback plug into the cable connectors of
the 3C985B-SX server NIC. The loopback plug lets the
3C985B-SX server NIC transmit and receive on a closed
loop. A fiber-optic loopback plug for the 3C985B-SX
server NIC can be constructed from a single strand or
a double strand of standard fiber-optic cable.
I
I
Setting
Enabled.
Set to any IRQ that does not conflict with
another device.
Level.
Recommended range is between 20 and 255;
typically set to 40.
Insert the NIC in another slot; the original slot may
be defective.
The NIC may be defective. Replace the suspected
NIC with one that is known to work properly. For
information on product repair, see
To test for a defective server, install the NIC in a
functioning server.
Other NICs may be causing contention. Remove all
other NICs from the server and test the 3C985B-SX
server NIC separately.
Single-strand cable — Insert the male connectors at
both ends of the cable into the female connectors on
the NIC.
Double-strand cable — The following procedure for
creating a loopback plug from a common type of
double-strand cable is provided for your reference.
The way the connectors clip together may vary with
the manufacturer.
Constructing Loopback Plugs
Appendix
83
D.