Specifications

55Digital Family Features
Trunks
The following trunk related parameters apply to the
system.
Ground start: The DIGITAL system
interfaces with ground-start outside lines
via a COG or T1 card.
Loop start: The DIGITAL system interfaces with
loop-start outside lines via a COL, CHL, COG, or
T1/E1 card; in addition, in the DIGITAL KEY
BX system, four ports are included on the MPD
card.
ISDN Primary Rate Interface: The DIGITAL
system interfaces with the public network ISDN
Primary Rate Interface channels via a PRI24 and
PRI30 cards, where supported by the public network
(see ISDN Features, below).
ISDN Basic Rate Interface: The DIGITAL system
interfaces with the public network ISDN Basic
Rate Interface channels via BRT and BHT cards,
where supported by the public network (see ISDN
Features, below).
DPNSS interface: The DIGITAL system interfaces
with DPNSS lines for networking DIGITAL
switches, even with other vendor switches.
QSIG interface: The DIGITAL system interfaces
with QSIG lines to network a large number of
switches supplied by different vendors.
Tie line interface: The DIGITAL system interfaces
with tie lines via an EMD card or a T1/ E1 card.
Direct Inward Dial (DID): The DIGITAL system
translates incoming dialed digits to enable direct
inward dialing to specific extensions.
Open loop detection: If supported by the central
office, the DIGITAL system recognizes an open
loop state when a call has been placed, and it
disconnects the line.
Pulse or DTMF: Each trunk in the DIGITAL
system can be programmed as a pulse or DTMF
trunk.
Pulse to DTMF conversion: When required by
certain types of calls over a number of carriers, the
DIGITAL system can dial (via LCR) both pulse
and DTMF for a single subscriber number. Pulse-
to-DTMF conversion of an outside line can also
be included in all types of automatic dialing; that
is, speed dial, redial, save/repeat, and automatic
redial.
Tone detection: To enable automatic redial, auto
dialer (scanner), and speed dial chaining, the
DIGITAL system has call progress tone detectors
that can recognize dial tone, busy tone, reorder
tone, and ringback tone.
Battery reverse detection: When connected to an
inter-office trunk, the DIGITAL system can detect
reverse polarity caused by a closed loop.
Uniform call distribution (UCD)
The volume of call traffic can be divided equally and
fairly among system users to ensure uniform distribution
of the call traffic load and quicker response for incoming
callers.
Voice mail*
See Voice mail in Section 8, ImaGEN Voice Mail and
Automated Attendant Features, above.
Wall mounting station
To free desk space and for ease of operation, all Avanti
stations are wall-mountable.
* Requires the ImaGEN option