display system-parameters maintenance
Issue 4 May 2002
8-119555-233-123
DSO Loop-Around
Test Call
Extension
Extension number for the test call. This test extension number
is 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.”
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