Nortel Networks BCM50 - Manual (Page 272)

272 Appendix N Market profile attributes
NN40020-302
Analog and digital trunk types
The table Analog and digital trunk types and descriptions on page 272 describes the types of
analog and digital trunks.
Some of these trunk types are available only when you select specific market profiles.
Table 78 ISDN services by Protocol
Protocol Market profile Available ISDN services
• NI • Caribbean • North America • Basic Call
• DID
• Name display
• Number display
• ONN blocking
• ETSI
Euro • Australia
• CALA
• Denmark
• Germany
• Global
• Holland
• Hong Kong
• Italy
• Norway
• PRC
• Spain
• Sweden
• Switzerland
• United Kingdom
• Basic Call
• DDI
• sub addressing (on
S-loop)
• ETSI Call Diversion
(partial rerouting)
• AOC-E (specific changes
for Holland and Italy)
• MCID
• CLIP
• COLP
• CLIR
Table 79 Analog and digital trunk types and descriptions (Sheet 1 of 2)
Trunk types Description
Digital trunk types
T1/E1 Digital line that carries data on 24 channels at 1.544 Mbps (North American); 30 channels at 2048 Mbps
(Europe)
Loop, E&M, DID and ground start lines are also versions of T1 lines.
You can program autoanswer 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 a department or
individual) and line concentration (one trunk can map onto several target lines).
DID This is a type of T1 trunk line used by an outside caller to dial directly into a line on the BCM50.
Loop This is a type of T1 line. Use this type of line on systems where the service provider supports disconnect
supervision for the digital loop start trunks.
These trunks provide remote access to the Business Communications Manager from the public
network. This trunk must have disconnect supervision so you can set the trunk to autoanswer, which
provides the remote access portal.
Ground T1-groundstart trunk
These lines offer the same features as loop start trunks, but use these lines when the local service
provider does not support disconnect supervision for digital loop start trunks. Ground start trunks work
with T1 only. By configuring lines as ground start, the system recognizes when a call is released at the
far end.
E&M T1 and E&M. Use this type of trunk line to create simple network connections to other phone systems.
This trunk always operates in a disconnected supervised mode.
PRI ISDN interface with 23 B channels and 1 D channel at 1.544 Mbps (in Europe: 30 B-channels and 1
D-channels at 2.048 Mbps).
These lines give you incoming and outgoing access to an ISDN network and are autoanswer trunks.