Appendix H Market profile attributes 379BCM200/400 4.0 Installation and Maintenance GuideAnalog and digital trunk typesTable 111 provides a description of the types of analog and digital trunks.Note that some of the analog and digital trunks are available only when you select specific marketprofiles.Table 111 Analog and digital trunk types and descriptions (Sheet 1 of 2)Trunk types DescriptionDigital trunk types:T1/E1 Digital line that carries data on 24 channels at 1.544 Mb/s (North America); 30 channels at2,048 Mb/s (Europe)Loop, E&M, DID, and ground start lines are also versions of T1 lines.You can program auto-answer T1 loop start, T1 E&M trunks, T1 DID, T1 ground start trunks,PRI and IP trunks to map to target lines to provide for attendant bypass (calling directly to adepartment or individual) and line concentration (one trunk can map onto several targetlines).DID A type of T1 trunk line that allows an outside caller to dial directly into a line on the BCMsystem.Loop A type of T1 line that is used on systems where the service provider supports disconnectsupervision for the digital loop start trunks.These trunks provide remote access to the BCM system from the public network. Thesetrunks must have disconnect supervision to allow the trunk to be set to auto-answer, whichprovides the remote access portal.Ground T1-groundstart trunk.These lines offer the same features as loop start trunks, but are used when the local serviceprovider does not support disconnect supervision for digital loop start trunks. Ground starttrunks work with T1 only. By configuring lines as ground start, the system recognizes when acall is released at the far end.E&M T1 and E&M. This type of trunk line is used to create simple network connections to otherphone systems.This trunk always operates in a disconnected supervised mode.PRI ISDN interface with 23 B channels and 1 D channel at 1.544 Mb/s (in Europe: 30 B-channelsand 1 D-channels at 2.048 Mb/s).These lines give you incoming and outgoing access to an ISDN network and areauto-answer trunks.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 ISDNBRI is the European Telecommunications Standards Institute specification for BRI ISDNservice. BRI provides two bearer B-channels operating at 64 Kb/s and a data D-channelwhich operates at 16 Kb/s. The D-channel is used primarily to carry call information. Likeloop start trunks, BRI lines can be configured as manual-answer or auto-answer.DASS2 (British) Trunk provides multiline IDA interconnection to the British Telecom network.
