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DCP Mode 1 Installation and Administration 10-7
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LOOPBACK TESTING
AT&T Network Systems requires loopback capabilities in order to test and support AUDIX networking
over switched digital services (SDS). With R1V7 software and a TN539B ACCE, this test can be enabled
via the maintenance : network form. On R1V5 and R1V6 systems, an MPDM/M1* is required for
loopback testing.
Loopback Testing for R1V7
On AUDIX R1V7 systems, you can test the connection between the local AUDIX system and the 56 Kbps
serving office (SO), as shown in Figure 10-4, 56 Kbps Network Loop-Around Test. Normally only the four
DCP ports are tested, but if you have an MPDM/M1* connected to ports 5 and 6, they may also be tested
using the AUDIX maintenance : network 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
that 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 7 to test a 56 Kbps network
connection. Press TAB to get to the channel field and 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 56 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 the specify the channel (1-6) you want to
take out of loopback mode. Press CHANGE or RUN and wait for the result.