Testing Switch Interfaces; Troubleshooting - Allied Telesis AT-8600 Hardware Reference Manual

Hardware Reference
Basic problems
C613-03080-00 REV G

Testing Switch Interfaces

Loopback plugs are used in conjunction with Test Facility software to test the
physical interfaces on the switch (see the section
this Reference, and the Test Facility chapter of the AT-8600 Series Software
Reference). The purpose of a loopback plug is to connect the output pins on the
interface to the input pins so that any data transmitted over the interface is
looped back and received at the same interface.
Gigabit copper interfaces (as found on the AT-A39/T expansion module, and
the AT-8648T/2SP) cannot be looped back. Loopback plugs can only be used in
conjunction with 10/100 Ethernet interfaces.
On interfaces with control signals, these are also looped back. The data
received on the interface is compared with the data transmitted to determine
whether or not the interface is functioning correctly. In order to produce a
comprehensive test report for the interface being tested, most tests performed
by the Test Facility require a loopback plug to be inserted.
Figure 7: Ethernet twisted pair (TP) loopback plug
Twisted Pair (TP) Loopback Plug (RJ45 connector)
TX+ 1
TX- 2
RX+ 3
4
Not
5 connected
RX- 6 Not
7
connected
8
•Not

Troubleshooting

To eliminate some basic problems:
1. Make sure the power cord is securely connected.
2. Check that the power supply voltage is stable.
3. Check that the correct data cables are being used and that their connections
are secure.
4. Make sure that other network devices are working properly.
5. Use the show install command to check that the latest software release is
loaded. See the AT-8600 Series Software Reference for more information about
obtaining the latest software release.
6. If the switch is malfunctioning, reboot it by entering the restart reboot
command. Alternatively, power OFF and ON the switch by disconnecting
and reconnecting the main power supply (including, if connected, the RPS
power).
"Test Facility" on page 25
8 7 6 5 4 3 2 1
Switch end view
of plug
RTPLOOPsw
27
of