Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual page 28

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loopback requirements.
outlines how to construct a loopback plug or cable.
To run the Test Facility for a specific interface, use the command:
enable test interface={all|base|expansion|ethn|synn|portn|
brin|prin|engine|mac|mac0|mac1|mac2}
where n is the interface number.
To run the Test Facility for all interfaces on a PIC, use the command:
enable test interface=exp
The tests will run for 4 minutes.
Table 17: Loopback plugs, cables and devices required for testing PIC interfaces
Switch Interface Loopback plug, cable or test device required
Asynchronous RJ-45 asynchronous loopback plug.
Use one plug to individually test each port one by one, or all ports
can be tested simultaneously if sufficient loopback plugs are
available.
Ethernet LAN Ethernet loopback plug.
(AT-AR022 ETH PIC only)
The Test Facility software will detect (by looking for traffic) if the
transceiver is connected to a working LAN. If it detects traffic, the
transceiver test will abort.
Basic Rate ISDN The BRI PIC does not support the NT mode, so a loopback plug can
not be used. Internal loopback tests can be run without a
loopback plug. For more complete testing, connect the BRI
interface to an external ISDN test device and use the ENABLE BRI
CTEST command and the DISABLE BRI CTEST command from the
Integrated Services Digital Network (ISDN) chapter (of the
Software Reference or Reference Manual for your switch or
router) to execute conformance loopback tests and to generate
packets.
Primary Rate ISDN PRI loopback plug.
Synchronous External test unit.
This can be purchased through authorised Allied Telesyn
distributors or resellers. It contains custom-built electronics to
allow all interface types (RS-232, V.35 and X.21) to be
automatically tested using a single cable.
If the tests are run without a loopback plug, they will stop after about 30
seconds and display a warning message to that effect. To view the results of the
tests at any time, use the command:
show test
The status of the tests for each interface will be shown in the right-most column
of the output. For more information on the meanings of the other figures, see
the Test Facility chapter of the Software Reference or Reference Manual for your
switch or router.
If you are unsure about running the Test Facility, or have difficulty evaluating
the results, contact an authorised Allied Telesyn distributor or reseller.
"Loopback Plugs for Testing Interfaces" on page 41
Port Interface Card
C613-03023-00 REV J