Troubleshooting guide

MX2820 System Manual
5-94 61186003L1-1D
Remote Loopback
A DS3 Remote Loopback test performs a loopback on the far-end M13 multiplexer. This
loopback is only available when the DS3 signal is configured for C-bit parity framing since it
requires the availability of the FEAC channel.
NOTE
Local timing must be selected before initiating this loopback. It can
be returned, if needed, after the loopback test is cancelled.
Remote All T1/E1
A DS3 Remote All T1/E1 loopback test performs a loopback of all T1/E1 channels on the far-
end M13 multiplexer. If an M13 MUX is located at the far end, an Analog Loopback is
executed on all active channels simultaneously. The form of the loopback code sent to the far-
end depends on the framing mode being used. When in C-bit parity mode, the M13 MUX
sends loopback commands over the FEAC channel. When operating in M13 framing mode, the
M13 MUX sends C-bit loopbacks at the DS2 level.
RESET ALL TESTS
To reset all M13 MUX loopback tests, select option 37, RESET ALL TESTS, from the MX2820
Loopbacks Menu screen, and press
ENTER.