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AT&T
MERLIN LEGEND™
COMMUNICATIONS SYSTEM
APPLICATION NOTES
MERLIN LEGEND™ COMMUNICATIONS SYSTEM
Applications Note On Basic Trunking Concepts
Abstract
This Application Note describes the various types of trunks that link the MERLIN LEGEND
Communications System with the telephone network. Operating characteristics of the various trunks are
shown to be a function of both the trunk type and the capabilities of the LEGEND system hardware and
software. The Note is designed to help Account Executives and System Consultants, so a basic approach
to the subject is used. The concepts covered also apply to other customer premises switching equipment as
well as the MERLIN LEGEND CS.
This Application Note is designed for use as a reference manual.
Refer to it each time you get involved with a MERLIN LEGEND system sale requiring a mixture of the
various types of lines and trunks.
MERLIN is a registered trademark of AT&T.
DIMENSION is registered trademarks of AT&T.
MERLIN LEGEND is a trademark of AT&T.
MERLIN MAIL is a trademark of AT&T.
MLX-10, MLX-10D, MLX-10L MLX-28D are trademarks of AT&T.
ACCULINK is a trademark of AT&T.
ACCUNET is a trademark of AT&T.
Copyright January 1992, AT&T
555-600-736
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Inhaltsverzeichnis

Seite 1 - AT&T

AT&TMERLIN LEGEND™COMMUNICATIONS SYSTEMAPPLICATION NOTESMERLIN LEGEND™ COMMUNICATIONS SYSTEMApplications Note On Basic Trunking ConceptsAbstractTh

Seite 2

-8-CostUnfortunately, the most common reason for using loop-start trunks is the least valid. This reason is cost.If a customer currently has a key sys

Seite 3

-9-GROUND-START TRUNKS:OPERATIONSGround-start facilities were specifically introduced to solve the problems that PBXs encounter on loop-starttrunks.

Seite 4 - TIP AND RING EXPLAINED

-10-GROUND-START TRUNKS:POTENTIAL PROBLEMSThere are very few problems that can occur when properly functioning ground-start trunks serve a properlyadm

Seite 5 - LINES AND TRUNKS

-11-DIRECT INWARD DIALING (DID) TRUNKS:OPERATIONAL CHARACTERISTICSLoop-start trunks and ground-start trunks are simple, two-way local facilities, i.e.

Seite 6 - LOOP-START TRUNKS:

-12-Once a trunk has been seized --the PBX has been alerted to the incoming DID call, and the addressinginformation has been sent -- there are three p

Seite 7 - POTENTIAL-PROBLEMS

-13-Outpulsing methods, it seizes a trunk by closing the loop and allowing current to flow. When the PBXrecognizes the trunk seizure from the CO it re

Seite 8

The options for each trunk group are as follows:* DID Trunk Protocol*Wink start (default)-14-● immediate start* Dial Mode* pulse (default)● tone* Expe

Seite 9 - WHEN TO USE LOOP-START TRUNKS

-15-WHEN TO USE DID TRUNKSDID trunks provide fast access to specific individuals. DID trunks should be considered when a customerhas sales people who

Seite 10

-16-(There will be someOf course, these tieordinary tie trunks.In special cases, tie trunks are used to join one PBX directly to another PBX. This ma

Seite 11 - OPERATIONS

-17-TIE LINES:Transferring CallsThe MERLIN LEGEND CS supports trunk calls that come into the system and go out on another trunkwithout any operator as

Seite 12 - POTENTIAL PROBLEMS

Issued January 1992Copyright 1991. AT&T555-600-736Jim PastoriusKevin LyonsWriters/EditorsContributors:A. CohenD. GuerroV. IlluzziR.G. Koppenheffer

Seite 13 - OPERATIONAL CHARACTERISTICS

-18-In order to approach a.LEGEND system implementation with tie trunks it is really only necessary to knowwhich signaling formats are supported and t

Seite 14

-19-OFF PREMISES STATIONSOn occasion, customers need to locate telephones away from the principal area of the PBX or Key systemterminal concentration.

Seite 15

-20-When an Off-Premises telephone is connected to the LEGEND system via the 008 OPT module certainaccessories must be used for grounding and protecti

Seite 16

-21-T-1 (DS1) SERVICEOVERVIEW AND OPERATIONSThe goal of the T-1 (DS1) section is to present basic information about T- 1 networking, what it is, how i

Seite 17 - TIE TRUNKS:

-22-service, quickly and efficiently.In the past it was necessary to establish a new circuit for virtually every application a customer wished touse.

Seite 18 - Tandem Tie Trunk Operation

-23-The technology for T-1 is moving rapidly. The encoding system and components are not alwaysupgradable to the newer innovations.● If the customer

Seite 19 - TIE LINES:

-24-CHANNEL SERVICE UNIT (CSU)The Channel Service Unit (CSU) provides the interface between the 100D module and the DS1 facilities.TWO AT&T models

Seite 20

-25-MULTIPLEXER (MUX)Multiplexer are devices that combine several individual information-carrying channels for transmissionover an aggregate link. Thi

Seite 21 - OFF PREMISES STATIONS

-26-The following table identities the AT&T DS1 services available to customers.DS1 FACILITY SERVICESDigital Signal 1 ServiceDescription ISDN T-1M

Seite 22

-27-Digital Signal 1 ServiceDescriptionISDNT-1MultiquestServiceAn incoming 900xWith DNISnumber that providescallers with voiceand data informationserv

Seite 23 - T-1 (DS1) SERVICE

MERLIN LEGEND TRUNKING CONCEPTSAPPLICATION NOTE INDEXIntroductionTip & Ring ExplainedLines & TrunksLoop-Start TrunksOperationsPotential Proble

Seite 24

-28-Digital Signal 1 ServiceStationNumberIdentification/AutomaticNumberIdentification(SID/ANI) ServiceDescriptionAcalleridentification servicefor syst

Seite 25 - DATA COMMUNICATIONS EQUIPMENT

-29-SPECIAL HOTEL/MOTEL TRUNKSOPERATION OVERVIEWIn certain areas of the country there are special trunks for hotels and motels about which you should

Seite 26 - CHANNEL SERVICE UNIT (CSU)

-30-HARDWAREThe Legend system hardware most directly connected with Lines/Trunks are the Control Unit Modules.The specifications for each module are p

Seite 27 - MULTIPLEXER (MUX)

-31-LEGEND SYSTEM CONTROL UNIT MODULESMODULE008008 MLXLINE/TRUNKTYPEn/an/a008 OPT n/aSTATION TYPEAnalog multilinetelephone; CallManagement System;anal

Seite 28 - DS1 FACILITY SERVICES

- 32 -MODULE012 (T/R)100D DSI400/TTR*400 E&M400 GS/LS/TTRLINE/TRUNKTYPEn/aT-1 or PRILoop-startand TTRTie trunkLoop-start orground-start andSTATION

Seite 29

-33-MODULELINE/TRUNKSTATION TYPESPECIFICATIONSTYPE408*L00p-startAnalog multilineCapacity: 4 lines/trunks, 8 stations.telephone; Call IPFT telephoneMan

Seite 30

-34-This section lists the LEGEND system trunk and off-premises modules and the appropriate PEC andComcodes. More complete code information can be fou

Seite 31 - SPECIAL HOTEL/MOTEL TRUNKS

-35-ADMINISTRATIONTo properly administer a MERLIN LEGEND system at the time of initialization requires that care be takenduring the planning phase of

Seite 32 - HARDWARE

-36-REFERENCESGBS SCAN Competitive Newsletter, “Everything You Need to Know About ISDN”, Nov/Dec 1988.MERLIN LEGEND Key System Planning Manual (555-61

Seite 33

-2-INTRODUCTION TO TRUNKING CONCEPTSThe way lines and trunks have been used to meet customers’ needs over past decades is rapidly changing.T-1, ISDN t

Seite 34

-3-LINES AND TRUNKSTelephone lines and telephone trunks are facilities that carry voice or data communications. They aresimilar in form and function,

Seite 35

-4-LOOP-START TRUNKS:OPERATIONSLoop-start facilities are the simplest and most common end-user facilities in the nation-wide telephonenetwork. Loop-st

Seite 36

-5-LOOP-START TRUNKS:POTENTIAL-PROBLEMSThe most common application for loop-start facilities is single line residential service. Many of thedisadvanta

Seite 37 - CONSIDERATIONS

-6-The ARS feature also isolates the station user from the specific trunk, and even the group of trunks. thatcarries each outgoing call. Other feature

Seite 38

-7-LOOP-START TRUNKS:WHEN TO USE LOOP-START TRUNKSThere are two times when you consider the use of loop-start facilities: when you should use loop-sta

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