Instruction manual

Remote Data
Channel Loopback
During a remote data channel loop, the local channel transmit data is multiplexed
by the local DV-MUX3 and sent to the remote DV-MUX3.
At the remote DV-MUX3, the data channel is demultiplexed, the receive data is
looped back to the transmit path of the remote data channel, and then returned
through the link to the local data channel as received data.
While the loop is activated, the CD and CTS lines in the remote data channel inter-
faces are set low (inactive).
Figure 4-1 shows the loop connections. As long as the loop is activated and the link
connecting the two DV-MUX3 units operates properly (i.e., both the local and re-
mote SYNC LOSS indicators remain off), the data equipment connected to the lo-
cal DV-MUX3 must receive its own signals without errors, and the local RD indi-
cator must light when the local TD indicator lights.
Figure 4-1. Data Channel, Remote Loopback
Remote Voice
Channel Loopback
The voice channel remote loopback is similar to the data channel loopback. While
the loopback is connected, the subscriber connected to the local DV-MUX3 must
receive his/her own voice clearly and loudly.
During the voice channel remote loopback, the voice channel will be disconnected
on the remote side.
Remote Main Link
Loopback
During the remote main link loopback, both the voice and data transmit data are
looped back by the remote DV-MUX3 to the receive side of the local DV-MUX3,
demultiplexed and applied to the two channels as received data.
Figure 4-2 shows the loop connections.
The indications and the response of the data channel user’s data equipment are the
same as for the data channel loopback, and that of the voice channel, the same as
for the voice channel remote loopback.
DESCRIPTION OF DIAGNOSTIC FUNCTIONS
DV-MUX3 Installation and Operation Manual 4-3