DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Commands
8-110display system-parameters maintenance
8
ISDN-BRI
Service SPID
This field shows whether or not the link is associated with the
Service SPID. If the link is associated with the Service SPID, this
field contains a “yes” and the extension field is blank; otherwise,
this field is blank. Service SPID is a feature used by the system
technician to check building wiring between the switch and the
BRI endpoint.
DSO Loop-Around
Test Call
Extension
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.
DSO Loop-Around
Test Call
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.
More information follows.
DSO Loop-Around
Test Call
Extension
(cont’d.)
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.”
