Bay Networks Remote Annex 2000, Руководство по установке оборудования

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Remote Annex 2000 Hardware Installation Guide
Chapter 3 ROM Monitor Commands
3-22
net
The net command executes an Ethernet transceiver loopback test on
the local area network. The command syntax is:
net
The net command display looks like this:
The Ethernet transceiver loopback test sends a short packet from the
Remote Annex 2000 through the transceiver to test the network’s
integrity. The test can be executed either by attaching the Remote
Annex 2000 to the Ethernet, or by attaching an Ethernet loopback
connector to the network port.
For the 10Base5 and 10Base2 network interfaces, the preferred method
for running an Ethernet transceiver loopback test is to attach the
loopback connector to the network port, because short test packets
can interfere with normal network traffic. The accessory kit supplies
Ethernet loopback connectors for these interfaces.
The 10BaseT network interface does not require a loopback connector,
because it provides a Link Integrity LED next to the RJ45 connector.
This LED verifies that the receive circuit to the wiring concentrator is
operating correctly. If this LED is not lit, link LED impulses are not
present on the receive line due to a disconnected cable or some other
link failure.
The Ethernet transceiver loopback test causes the Net LED to turn off.
If the unit passes this test, the Net LED turns on and the console
displays Passed. If the Remote Annex 2000 fails, the Net LED remains
off, and the console displays an error message.
monitor:: net
Network test – PASSED