Avaya S8700 Series, Maintenance Manual

Page: 202 / 2618

Additional Maintenance Procedures
555-233-143 5-16 Issue 1 May 2002
4. Place a call. If the call does not go through (no ringing is heard), check to
see if the circuit has been removed or if the trunk is a rotary trunk.
The dial tone heard is coming from the far-end. If the far end has been
disabled, you will not hear dial tone. However, depending on far-end
administration, you may still be able to dial digits. Every digit dialed after
the port number is transmitted using end-to-end DTMF signaling. If the
trunk being tested is a rotary trunk, it is not possible to break dial tone.
DSO Loop-Around Test Call
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.
On the Trunk Group form:
■
Set the communications type to
data
when the incoming trunk group is
used only for data calls (SDS).
■
Set the communications type to
rbavd
(robbed bit alternate voice data)
when the incoming trunk group is used for robbed bit alternate voice and/or
data (SDN/SDDN).
■
Set the communications type to
avd
for private network trunks using
common channel signaling.
Reorder tone The trunk requested is in a different port network
from your station, and inter-PN resources are not
available to access it.
Intercept tone The port addressed is not a trunk, or it is a DID
trunk, or the trunk is not administered.
Confirmation tone The port is a tone receiver. See ‘‘DTMR Test Call’’
on page 5-17 .