User guide

Diagnostics 5-11
5
The Send 1:4 (or alternate) Test
Use when the loopup remote test fails to put the remote system into
loopback. You can determine if the failure is an intermittent or a hard
failure by continuously sending the 1:4 code, and monitoring the network
status to see if the pattern is being received.
The selections are available on the full bandwidth and on the DATA ports.
The full bandwidth code puts the remote system into full network
loopback. When used on a DATA port, the code puts the corresponding
remote port into loop payload.
The Send 1:2 Test
Use the 1:2 loopdown code when the loopdown remote test fails to
terminate the remote loopback.
You can determine if the failure is an intermittent or hard failure by
continuously sending the 1:2 and monitoring the network status to see if
the pattern is being received.
The selections are available on the full bandwidth and on DATA port 1.
The full bandwidth code takes the remote system out of full network
loopback. When used on DATA port 1, the code takes the corresponding
remote port out of loop payload.
The User 1 Pattern and User 2 Pattern Tests
These two user programmable (up to 24 bits) patterns enable you to
generate a test pattern rather than use pre-programmed patterns or live
trafÞc.
The Lamp Test
Use this test to verify the LEDs. During the test, all LEDs on the front panel
illuminate.
NOTE: If the loopup remote test fails to place the remote system into
loopback, check that the loop code and Network Framing parameters
are the same at each end of the link.