AT&T 585-300-903 manual Loopback Testing for R1V7

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.