Nortel BCM50 Configuration Manual page 252

252
Section 3: Features
Table 13 BRI and PRI line types (DTM and BRI modules) (Continued)
Digital trunk types
BRI
DASS2
DPNSS
Analog trunk types
Public
Private
N0027146 [Publish Date]
Description
ISDN loop that provides both T, S and U2 and U4 (region-specific) reference point
loops.
These loops can support both network (T and S loops) and terminal equipment
(S loop) connections.
This type of line provides incoming and outgoing access to an ISDN network.
ETSI ISDN BRI is the European Telecommunications Standards Institute
specification for BRI ISDN service. BRI provides two bearer B-channels operating
at 64 kbits/s and a data D-channel which operates at 16 kbits/s. The D-channel is
used primarily to carry call information. Like loop start trunks, BRI lines can be
configured as manual-answer or auto-answer.
(British) Trunk provides multi-line IDA interconnection to the British Telecom
network.
(international term: Q.Sig or Q.931) a digital private network signaling system
which allows phone systems from different manufacturers to be tied together over
E1 lines, offering significant enhancements to BCM50 networking capabilities.
DPNSS makes it easier to support centralized network functionality within private
networks, for operators and attendants dealing with large numbers of calls. Its
routing capabilities provide more of the larger-network capabilities without the
expense of installing a new system, re-configuring all the nodes and worrying
about a lot of downtime. Most functionality over DPNSS lines is transparent once
the DPNSS is programmed into the system.
DPNSS allows a local node, acting as a terminating node, to communicate with
other PBXs over the network using E1 lines. For example, corporate offices
separated geographically can be linked over DPNSS lines to other BCM50
systems, bypassing the restrictions of the PSTNs to which they may be
connected. This allows connected BCM50 systems to function like a private
network.
Provides potential access for any set on the system.
Provides potential access for a specific set.
Defining region-based defaults