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12-4 DCP Mode 3 Installation and Administration
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LOOPBACK TESTING FOR INTERLOCATED SYSTEMS
If the AUDIX systems to be networked are at different locations (interlocated) and a serving office (SO)
will provide 64 Kbps service, you will need to test the connection between the local AUDIX system and the
64 Kbps serving office (SO), as shown in Figure 12-2, 64 Kbps Network Loop-Around Test. If you have
R1V7 software, you can do this via the maintenance : network form for the DCP ports (ports 1-4).
If you have an MPDM/M1* connected to ports 5 and 6, they may also be tested for 64 Kbps operation
using this form.
While a channel is in loopback mode, it will be unavailable to send information to remote systems or
receive information from remote systems. Incoming calls will be answered, but the calling system will be
unable to establish a connection; eventually it will drop the call and attempt to call back at its next
scheduled transmission time.
Also, if you put a channel in loopback mode, any active calls will be dropped. It is therefore recommended
before you perform this test you check the status of the channel. It is also not a good idea to perform this
test during peak traffic times.
1. Go to the maintenance : network form. Set select test to 8 to test a 64 Kbps network
connection. Press TAB to get to the channel field and then specify the channel (1-6) you want to
use for the test. Press CHANGE or RUN and wait for the result.
NOTE
If you have an MPDM/M1* between the AUDIX system and the PBX, you may also
test channels 5 or 6 (the RS-232 channels) for 64 Kbps operation.
2. Have the serving office place a call to the telephone number assigned to the channel you specified on
the maintenance : network form. If the test is successful, any data the serving office sends
over the AUDIX channel will be echoed back.
3. Go to the maintenance : network form. Set select test to 9 to take the channel out of
loopback mode. Press TAB to get to the channel field and then specify the channel (1-6) you want
to take out of loopback mode. Press CHANGE or RUN and wait for the result.