AT&T Merlin Dokumentacja

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

-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

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

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

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

-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

-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

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

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

-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

-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

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

-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

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

-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

-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

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

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

-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

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

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

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

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

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

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

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

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

- 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

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

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

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

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

-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

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

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

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

-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

-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