Nortel Networks BCM50 - Manual (Page 273)

Appendix N Market profile attributes 273
Installation and Maintenance Guide
BRI ISDN loop that provides both T and S 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 that operates at 16 kbits/s. Use the
D-channel to carry call information. Like loop start trunks, you can configure BRI lines as manual
answer or autoanswer.
DASS2 (British) Trunk provides multiline IDA interconnection to the British Telecom network.
DPNSS You can use a digital private network signaling system to tie together phone systems from various
manufacturers over E1 lines, offering significant enhancements to BCM50 networking capabilities.
DPNSS makes it easy to support centralized network functionality within private networks for operators
and attendants dealing with large numbers of calls. The routing capabilities provide more larger-network
capabilities without the expense of installing a new system, reconfiguring all the nodes or incurring
extensive downtime. Most functionality over DPNSS lines is transparent after you program the DPNSS
into the system.
DPNSS uses a local node, acting as a terminating node, to communicate with other PBXs over the
network using E1 lines. For example, you can link corporate offices separated geographically over
DPNSS lines to other BCM50 systems, bypassing the restrictions of the PSTNs to which they are
connected. BCM50 systems can function like a private network using DPNSS.
R2MFC Provides MFC-R2 (Multi-Frequency Compelled R2) signaling over an E1 trunk.
Analog trunk types:
Loop start Standard PSTN telephone line.
ADID An analog trunk that allows an outside caller to dial directly into a line on the BCM system. This type of
trunk provides one way (incoming only) call service.
Table 79 Analog and digital trunk types and descriptions (Sheet 2 of 2)
Trunk types Description
Digital trunk types