Lucent Technologies 555-661-140 User Manual

MERLIN LEGEND

Communications System Release 6.1

Installation

555-661-140 Comcode 108198029 Issue 1 August 1998

Printed in USA August 1998

1998, Lucent Technologies 555-661-140

Notice Every effort was made to ensure that the information in this book was

complete and accurate at the time of printing. However, information is subject to change.

See Appendix A, “Customer Support Information,” for important information. It follows

Troubleshooting

Maintenance and

in this binder. Your Responsibility for Your System’s Security Toll fraud is the unauthorized use of your telecommunications system

by an u nauthorized party, for example, persons other than your company’s employees, agents, subcontractors, or persons working on your company’s behalf. Note that there may be a risk of toll fraud associated with your telecommunications system, and if toll fraud occurs, it can result in substantial additional charges for your telecommunications services.

You and your system manager are responsible for the security of your system, such as programming and configuring your equipment to prevent unauthorized use. The system manager is also responsible for reading all installation, instruction, and system administration documents provided with this product in order to fully understand the features that can introduce risk of toll fraud and the steps that can be taken to reduce that risk. Lucent Technologies does not warrant that this product is immune from or will prevent unauthorized use of common-carrier telecommunication services or facilities accessed through or connected to it. Lucent Technologies will not be responsible for any charges that result from such unauthorized use. For

Trademarks 5ESS, ACCUNET, ACCULINK, CONVERSANT, DEFINITY, Magic On

Hold, Megacom, MERLIN, MERLIN II, MERLIN LEGEND, MERLIN MAIL, MultiQuest, Music on Hold, PassageWay, MLX-5, MLX-5D, MLX-10, MLX-10D, MLX-10DP, MLX16DP, MLX -20L, MLX-28D and Systimax are registered trademarks and 4ESS, Lucent Technologies Attendant, AUDIX Voice Power, FAX Attendant System, HackerTracker, MERLIN Identifier, ProLogix, are trademarks of Lucent Technologies in the US and other countries.

Microsoft and Windows are registered trademarks of Microsoft Corporation.

ProComm and ProComm Plus are registered trademarks of DataStorm Technologies, Inc.

Supra, StarSet, and Mirage are registered trademarks of Plantronics, Inc. UNIX is a registered trademark of UNIX System Laboratories, Inc.

PagePac is a registered trademark of DRACON, a division of Harris Corporation.

Okidata is a registered trademark of Okidata Corporation. NORTEL is a registered trademark and DMS a trademark of Northern

Telecom. MCI, Prism, and Vnet are registered trademarks of MCI

Communications Corporation.

Ordering Information

Call: BCS Publications Center

Voice 1 800 457-1235 International Voice 317

Fax 1 800 457-1764 International Fax 317

Write: BCS Publications Center

2855 North Franklin Road Indianapolis, IN 462191385

322-6791

322-6699

MERLIN LEGEND Communications System Release 6.1 Installation

555-661-140

Contents

New Features and Enhancements xxiii

■ Release 6.1 Enhancements

(August 1998) xxiii

Prior Releases Features and Enhancements xxix

■ Release 6.0 Enhancements (Feb ru ar y, 199 8) xxix

■ Release 5.0 Enhancements (June, 1997) xxxiv

■ Release 4.2 Enhancements (June, 1997) xl

■ Release 4.1 Enhancements (June, 1997) xliv

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Page v

■ Release 4.0 Enhancements (Ma rch, 1996) xlvi

■ Release 3.1 Enhancements (March, 1996) l

About This Book liii

■ Intended Audience liii

■ How to Use This Book liii

■ Terms and Conventions Used liv

■ Product Safety Advisories lvi

■ Security lvii

■ Related Documents lviii

■ How to Comment on This Document lix

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Contents

1 Introduction 1-1

■ Installation Sequence 1-1

■ System Forms 1-2

■ Programming the System 1-4

■ Upgrading the System 1-4

2 Installing the Control Unit 2-1

■ Overview 2-1

■ AC Power and Grounding 2-6

■ Unit Loads 2-17

■ Installing the Basic Carrier 2-18

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■ Installing the Power Supply 2-20

■ Installing the Auxiliary Power Unit 2-26

■ Installing Expansion Carriers 2-28

■ Installing the Processor 2-30

■ Installing the Modules 2-33

■ Replacing a Module 2-41

■ Connecting the Control Unit to an AC Outlet 2-44

■ Powering Up the System 2-45

■ Powering Down the System 2-46

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Contents

3 Installing Telephones and Adjuncts 3-1

■ Installing Multi-Function Modules 3-2

■ Installing Adjuncts 3-22

■ Installin g Direct Station Selectors 3-43

■ Assembling MLX Telephone s 3-48

■ Installing Cordless or Cordless/Wireless Telephones 3-57

■ Connecting Telephones

to the Control Unit 3-58

4 Connecting the Control Unit to the

Network Interface 4-1

■ Wiring 4-2

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■ Testing Trunks 4-13

■ Labeling Trunks 4-15

■ Installing the Channel Service Unit 4-16

■ Wiring Two S witches Toget her 4-19

5 Installing the PC, CAT, or Printer 5-1

■ Connecting a PC to the Control Unit 5-1

■ Connecting a CAT

to the Control Unit 5-7

■ Connecting a Printer

to the Control Unit 5-7

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Contents

6 Connecting Data Equipment 6-1

■ Data Stations 6-1

■ Analog Voice and Modem Data Stations 6-5

■ Modem Data-Only Stations 6-8

■ MLX Voice and Modem Data Stations 6-10

■ MLX Voice and Terminal Adapter Data Stations 6-12

■ Terminal Adapter Data-Only Stations 6-14

■ Video Conferencing Data Stations 6-17

7 Initializing and Testing the System 7-1

■ Initializing the System 7-1

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■ Setting the Time and Date 7-3

■ Testing the System 7-3

■ Installing the Control Unit’s Housing 7-22

8 Installing Applications 8-1

■ Voice Messaging Systems and Touch-Tone Receivers 8-3

■ Automated Document

Delivery System 8-4

■ Call Accounting System 8-5

■ Call Accounting Termi nal 8-8

■ Call Management System 8-10

■ CONVERSANT 8-13

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Contents

■ Integrated Solution III 8-14

■ Lucent Technologies Attendant 8-17

■ MERLIN MAIL

■ MERLIN PFC

■ PassageWay Direct

* 8-19

† 8-22

Connect Solution 8-24

■ System Programming and Maintenance (SPM) 8-26

■ Installing a CTI Link 8-28

9 Upgrading the System 9-1

■ Upgrading to Release 6.1 9-2

■ Backing Up System Programming 9-4

■ Removing the Control Unit Housing 9-5

■ Powering Down the System 9-7

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■ Upgrading the Control Unit 9-9

■ Modifying the Processo r

for Key Mode 9-14

■ Completing the Upgrade 9-18

■ Upgrading from the MERLIN II

Communications System 9-18

■ Replacing the Control Unit Housing 9-20

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Contents

A System Numbering Forms A-1

■ Form 2a, System Numbering:

Extension Jacks A-2

■ Form 2b, System Numbering:

Digital Adjuncts A-4

■ Form 2c, System Numbering: Line/Trunk Jacks A-5

■ Form 2d, System Numbering: Special Renumbers A-6

B Unit Load Calculation Worksheet B-1

■ Unit Load Worksheet B-2

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IN Index IN-1

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Figures

2 Installing the Control Unit

2-1 AC Grounding Requirements 2-7 2-2 Measuring the AC Outlet Voltages 2-10 2-3 Central Office and AC Grounds 2-12 2-4 Installing 146A and 147A Protectors 2-16 2-5 Marking the Basic Carrier Screw Holes 2-19 2-6 Installing a Copper Shield in the Power Supply 2-23 2-7 Installing the Ferrite Cores 2-25 2-8 Installing an Auxiliary Power Unit 2-27 2-9 Connecting the Carriers 2-29 2-10 Installing the Processor into the Carrier 2-32 2-11 400EM Module Sample Dip Switch Settings

for Signaling Types 1C and 5 2-38

2-12 Line/Trunk and Telephone Jack Locations on

Each Module 2-40

2-13 Removing Modules from the Carrier 2-43

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3 Installing Telephones and Adjuncts

3-1 Multi-Function Module Packing List 3-3 3-2 Removing the User Card Tray and Line Cable 3-4 3-3 Releasing the Deskstand 3-5 3-4 Removing the Deskstand 3-6 3-5 Releasing the Module Cover Screw 3-7 3-6 Releasing the Module Cover 3-8 3-7 Removing the Module Cover 3-9 3-8 Removing an MFM Module 3-10

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3-9 Installing an MFM Module 3-11 3-10 Setting and Adjusting the MFM Jumpers 3-12 3-11 Removing the Jack Guard 3-13 3-12 Placing the Module Cover into the Locating Slot 3-14 3-13 Lowering and Locking the Module Cover 3-15 3-14 Replacing and Tightening the Module Cover Screw 3-16 3-15 Replacing the Deskstand 3-17 3-16 Lowering the Deskstand and Locking into Place 3-18 3-17 Replacing the User Card Tray and Line Cable 3-19 3-18 Adjusting the Deskstand Height 3-20 3-19 Powering Up the Telephone after Installing the MFM 3-21 3-20 Routing the Cord(s) Through the Cord Channel 3-23 3-21 Manual and One-Touch Headset Operation 3-29 3-22 Single-Zone Paging with PagePac Plus 3-31 3-23 Single-Zone Paging with Customer-Supplied Amplifier 3-32 3-24 Single-Zone Paging with UPAM 3-33 3-25 Single-Zone Paging with Background Music and

Magic on Hold 3-36

3-26 Multizone Paging with Background Music, Magic on Hold,

and Bidirectional Paging (Talk-Back) 3-37 3-27 Installing the Supplemental Alert Adapter 3-39 3-28 Connecting One or More DSSs 3-45 3-29 Wiring for Auxiliary Power 3-46 3-30 Adjusting or Removing the Deskstand 3-49 3-31 Connecting the Line Cords 3-50 3-32 Removing the Extension Label 3-51 3-33 Labeling the Extension 3-52 3-34 Removing the Handset Holder 3-53 3-35 Rotating the Handset Holder 3-53 3-36 Replacing the Extension Label 3-54 3-37 Mounting the Backplate 3-55 3-38 Routing the Cord Through the Backplate 3-56

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3-39 Connecting Two Voice Pairs to a Telephone Using

a Bridging Adapter (BR-241-B1) 3-62 3-40 Removing the Connecting Block 3-64

4 Connecting the Control Unit to the Network Interface

4-1 RJ21X Network Interface Connector 4-6 4-2 RJ21X Wiring Field Hardware 4-7 4-3 RJ21X Wiring Field Tools 4-8 4-4 Using the D-Impact Tool to Seat the Conductors 4-9 4-5 RJ11 and RJ14 Interfaces 4-11 4-6 3150 Front Panel 4-18 4-7 3150 Back Panel 4-19 4-8 DEFINITY ECS or DEFINITY ProLogix to

MERLIN LEGEND T1 Tie Direct Connection on

same continuous property 4-20 4-9 MERLIN LEGEND to MERLIN LEGEND T1 Tie Direct

Connection on the same continuous property 4-21

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5 Installing the PC, CAT, or Printer

5-1 Connecting a PC Within 50 ft. (15.2 m) 5-3 5-2 Connecting a PC More Than 50 ft. (15.2 m) Away 5-6 5-3 Connecting a CAT and Printer on the Same AC Outlet 5-10 5-4 Connecting a CAT and Printer on Different AC Outlets:

Control Unit Connections 5-13 5-5 Connecting a Printer Within 50 ft. (15.2 m) 5-16 5-6 Connecting a Printer More Than 50 ft. (15.2 m) Away 5-19 5-7 Connecting the 248B Adapter and the 2012D

Transformer 5-20

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6 Connecting Data Equipment

6-1 Analog Voice and Modem Data Equipment Configuration 6-7 6-2 Modem Data-Only Equipment Configuration 6-9 6-3 Modem Data and MLX Voice Equipment Configuration 6-10 6-4 MLX Voice and Terminal Adapter Data Equipment

Configuration 6-13 6-5 Terminal Adapter Data-Only Equipment Configuration 6-16 6-6 Video Conferencing Configuration 6-19

7 Initializing and Testing the System

7-1 Ground-Start Button 7-20 7-2 Installing the Control Unit Top Cover 7-23 7-3 Installing the Control Unit Front Cover 7-24

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9 Upgrading the System

9-1 Removing the Control Unit Housing 9-6 9-2 Powering Down the System 9-8 9-3 Removing a Module from the Carrier 9-11 9-4 Replacing a Module in the Carrier 9-13 9-5 Removing the Processor Module Cover 9-15 9-6 Removing the Processor Module Circuit Board 9-16 9-7 Changing the Key Mode Switch Position to Closed 9-17 9-8 Installing the Control Unit Housing 9-21

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A System Numbering Forms

A-1 Form 2a, System Numbering: Extension Jacks A-2 A-2 Form 2b, System Numbering: Digital Adjuncts A-4 A-3 Form 2c, System Numbering: Line/Trunk Jacks A-5 A-4 Form 2d, System Numbering: Special Renumbers A-6

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MERLIN LEGEND Communications System Release 6.1 Installation

Tables

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Ta b l e s

2 Installing the Control Unit

2-1 Environmental Requirements 2-2 2-2 AC Power Requirements 2-8 2-3 Heavy Lightning Protection 2-15 2-4 Setting the 400EM (Tie Trunk) Module DIP Switches 2-36 2-5 Signaling Formats for the 400EM (Tie Trunk) Module 2-37

3 Installing Telephones and Adjuncts

3-1 Unsupported Telephones and Adjuncts 3-40 3-2 Single-Line Telephones 3-41 3-3 Single-Line Telephones Supported by Release 3.0

and Later 3-42

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4 Connecting the Control Unit to the Network Interface

4-1 Network Interfaces 4-3 4-2 Central Office Network Interface Codes 4-4

5 Installing the PC, CAT, or Printer

5-1 Lucent Technologies 572 Printer Options 5-22 5-2 Lucent Technologies 475/476 Printer DIP Switch

Settings 5-24

5-3 Lucent Technologies Printer DIP Switch Settings 5-25

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6 Connecting Data Equipment

6-1 Data Station Configurations 6-2 6-2 Terminal Adapter Settings 6- 21

8 Installing Applications

8-1 TTRs Required by VMS 8-4 8-2 MERLIN MAIL Port s Requ ired 8-20

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The exclamation point in an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

IMPORTANT SAFETY INSTRUCTIONS

When installing telephone equipment, always follow basic safety precautions to reduce the risk of fire, electrical shock, and injury to persons, including:

■ Read and understand all instructions.

■ Follow all warnings and instructions marked on or packed with the

product.

■ Never install telephone wiring during a lightning storm.

■ Never install a telephone jack in a wet location unless the jack is

specifically designed for wet locations.

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■ Never touch uninsulated telephone wires or terminals unless the

telephone wiring has been disconnected at the network interface.

■ Use caution when installing or modifying telephone lines.

■ Use only Lucent Technologies-manufactured MERLIN LEGEND

Communications System circuit modules, carrier assemblies, and power units in the MERLIN LEGEND Communications System control unit.

■ Use only Lucent Technologies-recommended/approved MERLIN

LEGEND Communications System accessories.

■ If equipment connected to the analog extension modules (008, 408, 408

GS/LS) or to the MLX telephone modules (008 MLX, 408 GS/LS-MLX) is to be used for in-range out-of-building (IROB) applications, IROB protectors are required.

■ Do not install this product near water, for example, in a wet basement

location.

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■ Do not overload wall outlets, as this can result in the risk of fire or

electrical shock.

■ The MERLIN LEGEND Communications System is equipped with a

3-wire grounding-type plug with a third (grounding) pin. This plug will fit only into a grounding-type power outlet. This is a safety feature. If you are unable to insert the plug into the outlet, contact an electrician to replace the obsolete outlet. Do not defeat the safety purpose of the grounding plug.

■ The MERLIN LEGEND Communications System requires a

supplementary ground.

■ Do not attach the power supply cord to building surfaces. Do not allow

anything to rest on the power cord. Do not locate this product where the cord will be abused by persons walking on it.

■ Slots and openings in the module housings are provided for ventilation.

To protect this equipment from overheating, do not block these openings.

■ Never push objects of any kind into this product through module

openings or expansion slots, as they may touch dangerous voltage points or short out parts, which could result in a risk of fire or electrical shock. Never spill liquid of any kind on this product.

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■ Unplug the product from the wall outlet before cleaning. Use a damp

cloth for cleaning. Do not use cleaners or aerosol cleaners.

■ Auxiliary equipment includes answering mach ine s, ale rts, mod e ms, and

fax machines. To connect one of these devices, you must first have a Multi-Function Module (MFM).

■ Do not operate telephones if chemical gas leakage is suspected in the

area. Use telephones located in some other safe area to report the trouble.

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WARNING:

■

For your personal safety, DO NOT install an MFM yourself.

■

ONLY an authorized technician or dealer representative shall install, set options, or repair an MFM.

■

To eliminate the risk of personal injury due to electrical shock, DO NOT attempt to install or remove an MFM from your MLX telephone. Opening or removing the module cover of your telephone may expose you to dangerous voltages.

SAVE THESE INSTRUCTIONS

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MERLIN LEGEND Communications System Release 6.1

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New Features and Enhancements

Release 6.1 Enhancements (August 1998)

New Features and Enhancements

Release 6.1 Enhancements (August 1998)

Release 6.1 includes all Release 6.0 functionality, plus the enhancements listed below.

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Private Networking

Release 6.1 enhances the functioning of the networked MERLIN LEGEND Communications System in a number of ways:

■ Centralized Voice Messaging

■ Group Calling Enhancements

■ Transfer Redirect

■ Direct Station S elector

■ Call Forwarding

■ SMDR

■ Decrease in Call Set-Up Time

■ PRI Switch Type T est

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Centralized Voice Messaging

One or more MERLIN LEGEND systems (Release 6.1 or later) can share the voice messaging system (VMS) of another MERLIN LEGEND system, provided the systems are directly connected to the system with the VMS. In this configuration, the system containing the VMS is known as the hub. This sharing

of the VMS is called “Centralized Voice Messaging.” Centralized Voice Messaging includes the functions of voice mail, Automated Attendant, and fax messaging. See the

Network Reference

Centralized Voice Messaging. Centralized Voice Messaging offers the following benefits:

■ Private-networked MERLIN LEGEND systems do not need a local VMS.

Having systems use a centralized VMS instead of separate VMSs is more economical.

■ Users that travel between sites can dial the same digits anywhere in the

private network to access the voice messaging system. For example, a salesperson headquartered in Cincinnati can dial the same four digits at the company’s Los Angeles office to retrieve voice messages.

for detailed information about

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■ Productivity is enhanced because messages can be forwarded and

broadcasted to all personnel within the private network.

■ Calling groups on networked systems can send overflow coverage to a

shared VMS, so that an incoming caller can leave a message instead of waiting in a queue.

■ The VMS can light the Message Waiting lights on multiple MERLIN

LEGEND systems in a private network. This greater efficiency saves time because a user only has to look at his or her telephone to determine if he or she has a message.

Group Calling Enhancements

A calling group can have a Uniform Dial Plan and exists on another MERLIN LEGEND Communications System connected by a tandem trunk to the local system. If a calling group contains a non-local member, the non-local member must be the in the calling group. See the

single

non-local member that is defined by the

Network Reference

for details.

only

member

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A calling group containing a single non-local member can be used for the same purposes as a calling group containing local extensions, including:

■ Night Service. Night Service coverage can be provided across a private

network to a centralized Automated Attendant, a non-local calling group, a QCC queue, a DLC, or any individual extension on the remote system, such as a night bell.

■ Group Coverage. Group Coverage can be provided across a private

network to a VMS, a non-local calling group, a QCC queue, a DLC, or any individual extension on the remote system.

■ Calling group overflow coverage. Calling group overflow coverage can

be provided by a centralized VMS, a non-local calling group, a QCC queue, a DLC, or any individual extension on the remote system.

■ Calls directed to another system. Lines connected to remote systems

can be answered by any extension programmed to answer the call, such as a centralized Automated Attendant or a system operator (QCC or DLC).

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Transfer Redirect

When an Automated Attendant transfers a call to a non-local extension, the transferring MERLIN LEGEND system monitors the call to ensure that it is answered. If the non-local extension is not available or the call is not answered within the transfer redirect timeout period (fixed at 32 seconds), the call stops ringing at the non-local destination and is redirected to the extension on the same system as the Automated Attendant that is programmed to receive redirected calls. This redirect extension can be a QCC queue, a calling group, or an individual extension.

Direct Station Selector

Now users can press a Direct Station Selector (DSS) button for a non-local extension to make or transfer calls to that extension. However, no busy indication is displayed by the DSS for non-local extensions.

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Call Forwarding

The Forward feature now can be used to send calls to non-local extensions across the private network.

SMDR

In addition to SMDR options for non-network calls placed to and from the local system, system managers now can program SMDR to log incoming and outgoing UDP calls, or they can choose to log no UDP calls. The factory setting is to record all UDP calls.

Customers who use a call accounting system may not want to fill the database with calls coming and going across the private network. These customers may choose not to log UDP calls.

Decrease in Call Set-Up Time

The set-up time for a call across a private network has been reduced by programming the number of UDP digits expected.

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PRI Switch Type Test

A new maintenance test, the PRI Switch Type Test, has been created to allow Lucent Technologies technicians or authorized dealers to automatically determine if each end of the PRI tandem trunks has been programmed correctly.

Service Observing

Service Observing allows one extension to listen in on (observe) a call at another extension. A typical application of this feature is that of a Customer Service supervisor observing how a Customer Service representative handles calls.

The Service Observing group can consist of from one extension to all extensions in the system, including other Service Observers. Up to 16 Service

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Observing groups can be programmed. The Service Observer and the observed extension must be on the same system.

The observer activates Service Observing either by pressing a Service Observing button and then dialing an extension number or by pressing a DSS or Auto Intercom button. The Service Observer must use an MLX telephone to observe an extension; the telephone at the observed extension can be of any type.

A warning tone that alerts the observer, the observed extension, and the caller that Service Observing is occurring can be set to On or Off through System Programming. The factory setting is On.

Win SPM

The System Programming and Maintenance (SPM) software is now available in a Windows format called

Win SPM

SPM provides a graphical user interface (GUI) for those tasks must commonly performed by the system manager. Pictorial representations of system components, such as modules and their vintages and the creation of MLX telephone button labels, appear on Win SPM. Win SPM also provides a DOS-emulator mode to program tasks not currently supported by the GUI and to program a MERLIN LEGEND system of Release 6.0 or earlier. Win SPM is available on CD-ROM and is supported in Windows 95 Windows 98.

. For Release 6.1 and later systems, Win

, Windows NT, and

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Windows NT Driver

Now available is the MERLIN LEGEND Windows NT PBX driver. When coupled with the CentreVu Telephony Services application, the driver provides true server-based Computer Telephony Integration (CTI). The new driver requires a MERLIN LEGEND system of Release 5.0 or later and servers and PCs that support the application s.

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MERLIN LEGEND Communications System Release 6.1

MERLIN LEGEND Communications System Release 6.1 Installation

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Release 6.0 Enhancements (February, 1998)

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Prior Releases Features and Enhancements

Release 6.0 Enhancements (February,

1998)

Release 6.0 includes all Release 5.0 functionality, plus the enhancements listed below.

Private Networks

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In Hybrid/PBX mode systems only, MERLIN LEGEND Communications Systems can be networked with one another or with DEFINITY Communications Server (ECS) and ProLogix private networks. In previous releases, this functionality is available using tie lines, but users handle calls between networked switches as outside calls. In this release, dialing the pool access code is not necessary for a call going from one networked switch to another. Also, delay-start tie trunks or T1 trunks administered as PRI can act as

Available for Hybrid/PBX mode systems, the private network features of the MERLIN LEGEND Communications System Release 6.0 provide the following advantages for geographically dispersed organizational sites:

■ Intersystem Calling. In a private network, users on one local system

can call extensions on other systems in the network. Release 6.0 can support 2-, 3-, 4-, or 5-digit dial plans. They dial these extensions as inside calls. To implement this function, the system manager programs

tandem trunks

Communications Systems in

to connect networked systems.

Enterprise

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the extension ranges of remote networked switches to create a non-local dial plan. This programming does not actually affect numbering on the remote system. To correctly set up systems for transparent calling among non-local dial plan extensions, the system manager assigns networking tie and/or PRI tandem trunks to pools. Then he or she programs as many as 20 patterns, associates with routes, Facility Restriction Levels (FRLs), digit absorption, and digit prepending. This allows ARS-like routing of non-local dial plan calls. In addition, system managers can control whether calling name, calling number, or both are shown at MLX display telephone for incoming calls across PRI tandem trunks.

■ Toll Savings. Private networked trunks allow you to realize significant

cost savings on toll calls by performing tandem switching in the following two ways:

— Callers on a local system can reach the PSTN via outside trunks

connected to other systems in a private network, avoiding toll charges or substantially decreasing the cost of toll calls. For example, if you are in Cincinnati and another site in your company is in Dallas, you can make a call to a number in the Dallas local calling area over your private network, decreasing toll costs.

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— In addition, organizations use private networked trunks to make calls

between networked systems, which may be geographically distant from one another. Using the example above, from your office in Cincinnati you can dial an extension at a sister site in Dallas, just as you would dial an extension on your own local system, without a costly long-distance phone call. You simply dial the extension number.

■ Service Cost Savings. In addition to toll call savings, there are two other

ways that organizations can save on service costs incurred from telecommunications providers that provide PSTN access:

— You order a point-to-point T1 circuit from a service provider, then use

system programming to set it up for tandem PRI services. As necessary, a service provider provides amplification for PRI tandem

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Release 6.0 Enhancements (February, 1998)

555-661-140

trunks in cases where the distance between networked systems is great enough to distort signals, but the service provider does not supply switching services.

— You can tailor your use of PRI B-channels with drop-and-insert

equipment that allows fractional use of T1 channels for non-MERLIN LEGEND data/video communications between sites, while keeping the remaining T1 channels for PRI voice or data traffic.

NOTE:

The 24th T1 channel must not be dropped before reaching the MERLIN LEGEND Communications System because MERLIN LEGEND uses the 24th channel as the PRI D-channel or signalling channel.

— You can tailor your use of T1 channels to support a mix of

T1-emulated tandem tie trunks for voice or data communications at 56 kbps per channel, allowing 2B data transfers at 112 kbps. The system also allows fractional use of point-to-point T1 tandem trunks with drop-and-insert equipment.

Issue 1

August 1998

Page xxxi

■ Voice Mail and Auto Attendant. Networked systems should have their

own local voice mail and/or auto attendant applications as well as their own external alerts and Music On Hold sources. However, a single auto attendant can transfer calls throughout the network. It can answer only those calls that arrive on the PSTN facilities of the system where it is connected. Chapter 1 in

Network Reference

includes an example of this

configuration.

Although many features are available using tie trunks for network connectivity, PRI tandem trunks provide greatly enhanced features and faster call setup. For this reason, PRI is recommended over tie functionality in private networks.

Group Calling Enhancements

Release 6.0 and later systems include Group Calling features that enhance group calling operations.

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