MX-2100/2104
Installation and Operation Manual
Chapter 5 Diagnostics
Diagnostic Tests
5-13
Local Channel Loop
When a local loop is activated on a channel of an I/O module, the channel
transmit signal is returned to the channel receive path. The transmit signal is still
connected to the transmit path and reaches the remote user. While the loop is
connected, the local user equipment must receive its own signal. The loop signal
path is shown in
. This loop provides a quick check of the connections to
the local user equipment.
Remote
MX-2100
Local
MX-2100
User or Test
Equipment
User or Test
Equipment
CHANNEL 1
Typical Module
Figure 5-5. I/O Module, Local Loop on Individual Channel
Remote Channel Loop
The remote loop is connected on the local MX-2100 unit, i.e., the local I/O
module returns the receive signal of the tested channel toward the remote
MX-2100. The loop signal path is shown in
. This loop allows the remote
user to perform a quick check of the end-to-end transmission on this channel.
Remote
MX-2100
Local
MX-2100
User or Test
Equipment
User or Test
Equipment
CHANNEL 1
Figure 5-6. I/O Module, Remote Loop on Individual Channel
