Nortel Modular Ics 6.0 Installer Guide

							P0992638 03Modular ICS 6. 0 Installer Guide
Trunks and target lines
Trunks are external lines that provide the physical connection 
between a Norstar system and other systems in a private or 
public network. Trunks are numbered 001 to 156 in a fully 
expanded system. Norstar Modular ICS supports six different 
types of trunks:
PRI trunks are used for incoming and outgoing calls over 
an ISDN network. PRI SL-1 lines can provide MCDN 
network functionality in a private network between other 
Norstar systems, Meridian 1 systems, or Business 
Communications Systems, if the appropriate software 
code has been installed.
T1 trunks are digital trunks that can be configured to act as 
loop start, ground start, E&M, DID, or leased lines, 
depending on your requirements.
—DID trunks route incoming calls from the public 
network directly to telephones within Norstar, without 
an attendant.
—Loop start trunks handle incoming and outgoing calls 
between Norstar and the public network.
—E&M trunks handle incoming and outgoing traffic 
between the Norstar system and the private network.
BRI trunks handle incoming and outgoing calls between 
Norstar and an ISDN network. 
Target lines are virtual communication paths between 
trunks and telephones on the Norstar system. They are 
incoming lines only, and cannot be selected for outgoing 
calls. With 192 target lines in a fully expanded system, you 
can concentrate auto answer calls on fewer trunks. This 
type of concentration is an advantage of target lines. 
Norstar mapping allows you to direct each target line to  
						

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one or more telephones. Target lines are numbered 157 to 
348 in a fully expanded system, and 157 to 284 in all 
others.
Telephones can be configured to have an appearance of any 
type of trunk and line, including target lines, but excluding PRI 
trunks. If assigned, they are used for monitoring call usage.
Trunk operating modes (T1)
T1 trunks have four operating modes:
ground start (T1 only)
loopstart (analog and T1)
E&M (analog and T1)
DID (analog and T1)
Ground start trunks (T1 only)
Ground start trunks offer the same features as loop start trunks, 
but are used when the local service provider does not support 
disconnect supervision for the digital loop start trunks. Ground 
start trunks work with T1 only. 
By configuring lines as ground start, the system will be able to 
recognize when a call is released at the far end. 
Tips - You cannot change the trunk mode for a ground 
start trunk on a  DTI. It always has disconnect supervision.
A DTI can provide a maximum of 24 ground start trunks. 
Analog ground start trunks are not supported. 
						

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DID trunks
DID trunks give you direct inward dialing (DID) from the 
public network. A typical application of these trunks is to map 
incoming digits onto target line appearances within the 
Norstar system. DID trunks can operate only as auto-answer 
trunks.
Ta r g e t  l i n e s
204
205
206
207
208
209Central office (CO)
Norstar
DID trunk
593-1234
593-1235
593-1236
593-1237
593-1238
593-1239 
						

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When a call comes in on a DID trunk, the Norstar system 
interprets the incoming digits in one of the following ways.
If the digits map onto a target line, the call is routed to all 
telephones with an appearance of that target line.
If the digits map onto the DISA DN, the caller hears 
stuttered dial tone. They must enter a six-digit Class of 
Service (COS) password from a DTMF telephone to hear 
system dial tone. 
They can then enter a:
—target line number
—line pool access code
—remote feature code
If the digits map onto the Auto DN, the caller hears system 
dial tone. They can then enter:
—a target line number
—the DISA DN, which will prompt for a Class of Service 
password
—a line pool access code
—a destination code
—a remote feature code from a DTMF telephone
Tips - Each DID Trunk Cartridge can provide four DID 
trunks. Each DID Trunk Cartridge also has four DTMF 
receivers dedicated to those trunks. A DTI can provide up to 24 
DID trunks.
You cannot configure a DID trunk as the prime line for a 
Norstar telephone or a Business Series Terminal.
The capabilities available to a remote caller are determined by 
the remote filters and remote package assigned to a line, or by 
the set restrictions, line restrictions and remote package 
assigned to the Class of Service password. 
						

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Analog loop start trunks
Loop start trunks give you incoming and outgoing access to 
the public network. Loop start trunks can be configured as 
manual-answer or auto-answer. The answer mode determines 
how the system handles incoming calls.
When a call comes in on a manual-answer loop start trunk, it 
alerts at all telephones with that line appearance. 
When a call comes in on an auto-answer loop start trunk that 
is configured to answer with direct inward system access 
(DISA), the caller hears a stuttered dial tone. They must enter 
a six-digit Class of Service (COS) password from a DTMF 
telephone to access system dial tone. 
Once the caller has system dial tone, they can then enter: 
a target line number
a line pool access code
a remote feature code. 
By default, auto answer loop start trunks are configured to 
answer with DISA, and are used to provide controlled access 
to Norstar system resources.
When a call comes in on an auto-answer loop start trunk that 
is not configured to answer with DISA, the caller hears system 
dial tone. 
They can then enter:
a target line number
the DISA DN, which will prompt for a Class of Service 
password
a line pool access code
a remote feature code from a DTMF telephone 
						

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To place an outgoing call, a loop start line can be selected by:
pressing a line button on the telephone
dialing a line pool access code
pressing a memory button that has been programmed with 
a line pool access code
Configuration tips
Loop start signaling is supported by Loop Start Trunk 
Cartridges, Call Information (CI) Trunk Cartridges and 
Digital Trunk Interfaces (DTI). Each Loop Start Trunk 
Cartridge or CI Trunk Cartridge can provide four loop start 
trunks. A DTI can provide up to 24 loop start trunks. If you 
wish to configure your loop start trunks as auto-answer, 
the trunks must have disconnect supervision.
For Loop Start or CI Trunk Cartridges installed in a Trunk 
Module, you will also need one E&M/DISA Trunk 
Cartridge for every two loop start trunks that you configure 
as auto-answer. The E&M/DISA Trunk Cartridge provides 
two DTMF receivers to receive the incoming digits from 
the central office. An auto-answer loop start trunk can give 
you the same kind of direct inward dialing function as a 
DID trunk.
If your system includes both loop start trunks and DID 
trunks, you would typically use loop sta rt trunks for 
outgoing calls and DID trunks for incoming calls.
You may configure a loop start trunk as the prime line for 
a Norstar telephone or a Business Series Terminal.
The capabilities available to a remote caller are determined 
by the remote filters and remote package assigned to a line, 
or by the set restrictions, line restrictions, and remote 
package assigned to the Class of Service password. 
						

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Two loopstart trunk cartridges are compatible with 
Modular ICS 6.0. The NT5B40GA-93 can be installed in 
trunk module (TM) slots only. The NT7B75GA-93 can be 
installed in either core slots three or four, or TM slots one, 
two or three.
Analog E&M trunks
An Analog E&M trunk gives you incoming and outgoing 
access to other systems in a private network. E&M trunks can 
be configured as manual-answer or auto-answer. The answer 
mode determines how the system handles incoming calls.
Key system
E&M
intelligent networkPA B X
PBX
PBX
E&M
Key system
Norstar
Norstar
E&M
Private network
E&M/DISA
Tru n k
Cartridges 
						

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By default, auto-answer E&M trunks are answered by the 
system with direct inward system access (DISA), and are used 
to provide controlled access to Norstar system resources.
When a call comes in on a manual-answer E&M trunk, it alerts 
at all telephones with that line appearance.
When a call comes in on an auto-answer E&M trunk that is 
configured to answer with DISA, the caller hears stuttered dial 
tone. They must enter a six-digit COS password from a DTMF 
telephone to hear system dial tone.
They can then enter a:
target line number
line pool access code
remote feature code
When a call comes in on an auto-answer E&M trunk that is not 
configured to answer with DISA, the caller hears system dial 
tone. At that point they can then enter one of the following:
a target line number
the DISA DN, which will prompt for a COS password
a line pool access code
a remote feature code from a DTMF telephone
To place an outgoing call, an E&M trunk can be selected by 
one of the following:
pressing a line button on the telephone
dialing a line pool access code
pressing a memory button that has been programmed with 
a line pool access code. 
						

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BRI trunks
BRI trunks give you incoming and outgoing access to an ISDN 
network. Like loop start trunks, they can be configured as 
manual-answer or auto-answer. See Ans mode on page 341.
BRI trunks provide a fast, accurate, and reliable means of 
sending and receiving data, images, text, and voice 
information. Using BRI lines allows for faster transmission 
speeds and the addition of a variety of powerful business 
applications, including remote LAN access, video 
conferencing, file transfer and Internet access.
For more information see Welcome to ISDN on page 37.
Note Profile 2: European BRI trunks can be either EURO or 
SL-1.
PRI trunks
PRI trunks are used for incoming and outgoing calls over an 
ISDN network. PRI trunks are automatically set to auto-
answer.
Incoming calls are routed to system telephones through 
assigned target lines. Outgoing calls are made using the 
intercom key, which connects to a line pool, or by entering a 
destination code, which defines a route for the call. 
PRI Sl-1 lines also can provide MCDN network functionality 
over a private network between other Norstar systems, 
Meridian 1 systems, or Business Communications Systems, if 
the appropriate keycode has been installed. Private networking 
is described in Networking with Norstar on page 91. 
						

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Target lines
A target line is a specific communication path that is reached 
by means of digits received from an incoming trunk. Target 
lines are used to answer incoming calls but cannot be used to 
make outgoing calls.
You can program auto-answer trunks to map to target lines to 
provide for attendant bypass, which allows the call to go 
directly to a department or individual, and line concentration, 
where one trunk can map onto several target lines.
No target lines are assigned to sets, except if the DID template 
has been applied to the system.
Target lines are referred to by line numbers 157-348 or 
157-284, in the same way as physical lines.
Privacy issue
You can set a target line to Private (default is 
Public), however, such features as Call Pickup 
can still answer these lines at remote telephones.