Avaya S8700 Maintenance Manual page 404

Maintenance Commands
DSO
Loop-Around
Test Call
Extension
DSO
Loop-Around
Test Call
Extension
Loss Plan
7-148 Issue 1 May 2002
This field contains the extension number for the test call extension number.
This test extension number will be used to establish a loop-around
connection on the selected trunk.
The DSO Loop-Around Test Call feature is used primarily for testing DSO
channels associated with non-ISDN-PRI trunks. The loop around is
activated by dialing the test extension number. Multiple DSO loop-around
connections can be set up by placing multiple calls to the loop-around
extension.
The DS0 Loop-Around feature provides a loop-around connection for
incoming non-ISDN DS1 trunk data calls. This feature is similar to the
far-end loop-around connection provided for the ISDN Test Call feature.
This DS0 loop around is provided primarily to allow a network service
provider to perform facility testing at the DS0 level before video
teleconferencing terminals are installed at the PBX.
The feature is activated on a call-by-call basis by dialing a test call
extension specified on the second page of the System Parameters
Maintenance form. No special hardware is required. When the test call
extension is received by the PBX, a non-inverting, 64-kbps connection is
set up on the PBX's Time Division Multiplexed bus. More than one
loop-around call can be active at the same time.
For calls routed over the public network using the ACCUNET Switched
Digital Service (SDS) or Software-Defined Data Network (SDDN), the data
transmission rate is 56 kbps, since robbed bit signaling is used. For calls
established over a private network using common channel signaling, the
full 64-kbps data rate is available.
When the incoming trunk group is used only for data calls (SDS), the
communications type on the associated Trunk Group form should be set to
"data." When the incoming trunk group is used for robbed bit alternate
voice and/or data (SDN/SDDN), the communications type on the Trunk
Group form should be set to "rbavd" (robbed bit alternate voice data). For
private network trunks using common channel signaling, the
communications type on the associated Trunk Group form can be set to
"avd."
Use only when extra loss is required to maintain quality of transmission on
conference calls. Leave this field blank if no extra loss is required. If extra
loss is required, enter digits as shown below.
555-233-143