AT&T 555-600-736 manual AT&T Merlin Legend Communications System Application Notes

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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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Contents AT&T Merlin Legend Communications System Application Notes Page Merlin Legend Trunking Concepts Application Note Index TIP and Ring Explained Introduction to Trunking ConceptsLines and Trunks LOOP-START Trunks Operations Problem of Glare LOOP-START Trunks POTENTIAL-PROBLEMSAutomated Attendant Ghost Calls and Loop-Start Facilities Proper Loop-Start Facility Applications LOOP-START Trunks When to USE LOOP-START TrunksUnavoidable Loop-Start Facility Applications Cost GROUND-START Trunks Operations GROUND-START Trunks When to USE GROUND-START Trunks GROUND-START Trunks Potential ProblemsDirect Inward Dialing did Trunks Operational Characteristics Types of Loop Reverse-Battery Signaling Did Trunk Signaling CharacteristicsAdministration Considerations in Using did Trunks TIE Trunks When to USE did TrunksSimple Tie Trunk Operation Tandem Tie Trunk Operation TIE Lines Signaling and ImplementationTransferring Calls P E Transmit C E I V E ON-HOOK OFF-HOOK OFF Premises Stations Page Overview and Operations DS1 ServicePotential Problems/Limitations DESIGN, Signaling & ImplementationDo GBS Customers Need T-1? Data Communications EquipmentChannel Service Unit CSU Multiplexer MUX Isdn DS1 Facility ServicesSDN SID/ANI Special HOTEL/MOTEL Trunks Maintenance and TroubleshootingOperation Overview Hardware Module LINE/TRUNK Station Type Specifications TTR Trunk analog voice Reusable Modules from Merlin II R3 Considerations AdministrationReferences