Nortel Modular Ics 6.1 Installer Guide

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P0603534  02Modular ICS 6.1 Installer Guide
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...

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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...

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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...

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• Two loopstart trunk cartridges are compatible with 
Modular ICS 6.1. 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...

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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...

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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 359.
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,...

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Target lines
A target line is an internal communication path that is reached 
by means of digits received from an incoming trunk. Target 
lines are assigned to answer direct-dial incoming calls but they 
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 to create line...

P0603534  02Modular ICS 6.1 Installer Guide
Remote system access
The remote access feature allows callers elsewhere on the 
private or the public network to access a Norstar system by 
dialing directly into the system without going through an 
attendant. Once in the system, the remote user can use some of 
the system resources. The remote access must be enabled in 
programming before callers can use it.
Norstar systems support remote system access on the 
following trunk types, which may require the...

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Remote access on loop start and E&M trunks
Loop start trunks provide remote access to Norstar from the 
public network. E&M trunks provide remote access from a 
private network. Each must be configured to be auto-answer to 
provide remote system access. 
A loop start trunk must have disconnect supervision if it is to 
operate in auto-answer mode. E&M trunks always operate in 
disconnect supervised mode.
When a caller dials into the...