Instruction manual

Extended Flexible Central Office Trunk Software Support Page 1453 of 3156
Features and Services
Tone Supervised Central Office Trunk with downloadable
Busy Tone parameters
A tone supervised COT has a busy tone detector on each unit. Busy tone is
provided by the PSTN when the far end releases from outgoing and incoming
trunks. The tone supervised COT is configured in LD 14 with BTS. This tone
supervision depends on the busy tone frequency and cadence characteristics,
as configured on a card basis using the Busy Tone ID (BTID) prompt in
LD 14.
Loop Break Supervised Central Office Trunk
This type of signaling provides disconnect supervision by detecting a
calibrated battery removal from the PSTN. The loop break COT supervision
is configured in LD 14 with LBS.
Unsupervised Central Office Trunk
An unsupervised COT has neither polarity, battery, nor busy tone detector.
Thus, no answer or disconnect supervision is provided for incoming or
outgoing calls. A trunk is configured as unsupervised in LD 14 using other
than BAT, LBS, ARF, or BTS.
Autoguard
Autoguard provides seize supervision on outgoing trunk calls. Autoguard is
configured in LD 14 with SEIZ = YES.
Extended Flexible Central Office Trunk Software Support also provides the
following capabilities:
• Trunk Barring. The XFCOT card can detect signaling from the PSTN
that a trunk is barred, and that any call on the trunk must be dropped. The
trunk unit is then marked software busy (busy barred) so that no outgoing
calls may be made. A TRK514 message is printed on the TTY. A STAT
(status) command in LD 32 or 36 yields a “Busy Barred” status. When
the PSTN signals that the trunk unit may be unbarred, the software idles
the trunk unit and a TRK515 message is printed on the TTY. Barring is
configured on a per unit basis in LD 14 against a CLS of BARA. The
BARA CLS is downloaded onto the XFCOT card.