Nortel Meridian 1 Succession 1000 Operating and installation instructions

Meridian 1
Succession 1000
Succession 1000M
Succession 3.0 Software
Telephones and Consoles
Description
Document Number: 553-3001-367
Document Release: Standard 1.00
Date: October 2003
Year Publish FCC TM
Copyright © 2003 Nortel Networks
All Rights Reserved
Produced in Canada
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the
radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at their own expense.
SL-1, Meridian 1, and Succession are trademarks of Nortel Networks.
Title page

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Revision history
October 2003 Standard 1.00. This document is a new NTP for Succession 3.0. It was created
to support a restructuring of the Documentation Library, which resulted in the
merging of multiple legacy NTPs. This new document consolidates
information previously contained in the following legacy documents, now
retired:
• Attendant Console Description (553-2201-117)
•Digital Telephones Line Engineering(553-2201-180)
•Meridian 1 Telephones (553-3001-108)
•Meridian 1 European Digital Telephones (553-3001-114)
•Telephone and Attendant Console Installation (553-3001-215)
• M3900 Series Meridian Digital Telephones (553-3001-216)
• Option 11C and 11C Mini Technical Reference Guide (553-3011-100)
Content from Option 11C and 11C Mini Technical Reference Guide also
appears in Circuit Card: Description and Installation (553-3001-211).

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Contents
About this document . . . . . . . . . . . . . . . . . . . . . . . 11
Subject .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Applicable systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Conventions .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Related information .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Meridian Digital Telephones . . . . . . . . . . . . . . . . . . 17
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Functional description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Meridian modular telephones . . . . . . . . . . . . . . . . 25
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Physical description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Features and options matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Optional equipment .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Telephone installation . . . . . . . . . . . . . . . . . . . . . . 53
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Packing and unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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Installation and removal of analog (500/2500-type) telephones . . . . . 54
Installation and removal of M2000 Series Meridian Digital Telephones . 55
M3900 Series Meridian Digital Telephones .. . . . . . . . . . . . . . . . . . . . 71
Designate telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Connect analog (500/2500-type) telephones . . . . . . . . . . . . . . . . . . . . 73
Cross-connect the telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
M2000 description . . . . . . . . . . . . . . . . . . . . . . . . . 83
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Software requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Modular options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Relocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Handsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
M2000 add-on modules . . . . . . . . . . . . . . . . . . . . . 113
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Packing and unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Busy Lamp Field/Console Graphics Module . . . . . . . . . . . . . . . . . . . . 114
Display backlight power supply option . . . . . . . . . . . . . . . . . . . . . . . . 115
Attendant Supervisory Module (M2250 console) . . . . . . . . . . . . . . . . 127
M2000 Series Meridian Digital Telephones .. . . . . . . . . . . . . . . . . . . . 133
Analog Terminal Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
M2000 data options . . . . . . . . . . . . . . . . . . . . . . . . 193
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Asynchronous Data Option .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

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Meridian Communications Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Meridian Communications Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Analog Terminal Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
M1250 and M2250 Attendant Consoles . . . . . . . . . 205
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Engineering and ordering codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Physical description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Installation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Operation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
M2317 telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Physical description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
Ordering information .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
M2616CT cordless telephone . . . . . . . . . . . . . . . . . 295
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Functional description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Physical description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
Meridian European digital telephones:
M3110, M3310, and M3820 . . . . . . . . . . . . . . . . . . . 311
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

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Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
Terminal options .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Configuration and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
M3900 description . . . . . . . . . . . . . . . . . . . . . . . . . 345
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Feature enhancements .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Full Icon Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Functional description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
Key descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
M3900 installation and configuration . . . . . . . . . . 393
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393
Environmental and safety considerations . . . . . . . . . . . . . . . . . . . . . . . 394
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
M3900 Flash Download . . . . . . . . . . . . . . . . . . . . . 437
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Summary of steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
Determining software, M3900 PSWV, or firmware versions . . . . . . . 447
Detailed Flash Download procedure .. . . . . . . . . . . . . . . . . . . . . . . . . . 448
Configuration parameters in LD 97 . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
Configuration parameters in LD 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . 457
Print Firmware Versions on M3900 Sets . . . . . . . . . . . . . . . . . . . . . . . 460
Query Disk Firmware Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461

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Flash Download advisements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464
PSDL installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
Commands for system-wide Flash Download of M3900 sets .. . . . . . 468
M5317 BRI terminal . . . . . . . . . . . . . . . . . . . . . . . . . 473
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
Physical description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
Environmental considerations .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
Terminal powering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478
Telephone programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485
Local voice features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488
Data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491
Digital telephones line engineering . . . . . . . . . . . . 493
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493
Engineering a telephone line .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Selecting a Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
Calculating DC Loop Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
Performing Loop Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504
Measuring Impulse Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506
Measuring Background Noise .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
Calculating Expected Pulse Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
Measuring DC Loop Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512
List of terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519

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About this document
This document is a global document. Contact your system supplier or your
Nortel Networks representative to verify that the hardware and software
described are supported in your area.
Subject
This document provides technical information about Meridian analog, digital
and modular telephone sets and attendant consoles. This information includes
descriptions, features and specifications; installation and configuration
procedures; operation; administration; software, wiring and power
requirements; environmental and safety considerations; installing and using
add-on modules, data options, and software. A section is also provided on
engineering and configuring digital telephone lines.
This document does not provide information about the Succession i2002 and
i2004 Internet Telephones or i2050 Software Phone. For information on
Succession i2000 Series Internet Telephones, refer to Internet Terminals:
Description (553-3001-368).
Note on legacy products and releases
This NTP contains information about systems, components, and features that
are compatible with Succession 3.0 Software. For more information on
legacy products and releases, click the Technical Documentation link under
Support on the Nortel Networks home page:
http://www.nortelnetworks.com/

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Applicable systems
This document applies to the following systems:
• Meridian 1 Option 11C Chassis
• Meridian 1 Option 11C Cabinet
• Meridian 1 Option 51C
• Meridian 1 Option 61
• Meridian 1 Option 61C
• Meridian 1 Option 61C CP PII
• Meridian 1 Option 81
• Meridian 1 Option 81C
• Meridian 1 Option 81C CP PII
• Succession 1000
• Succession 1000M Cabinet
• Succession 1000M Chassis
• Succession 1000M Half Group
• Succession 1000M Single Group
• Succession 1000M Multi Group
Note that memory upgrades may be required to run Succession 3.0 Software
on CP3 or CP4 systems (Options 51C, 61, 61C, 81, 81C).
System migration
When particular Meridian 1 systems are upgraded to run Succession 3.0
Software and configured to include a Succession Signaling Server, they

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Telephones and Consoles Description
become Succession 1000M systems. Table 1 lists each Meridian 1 system
that supports an upgrade path to a Succession 1000M system.
Note the following:
• When an Option 11C system is upgraded to run Succession 3.0 Software,
that system becomes a Meridian 1 Option 11C Cabinet.
• When an Option 11C Mini system is upgraded to run Succession 3.0
Software, that system becomes a Meridian 1 Option 11C Chassis.
For more information, see one or more of the following NTPs:
•Small System: Upgrade Procedures (553-3011-258)
•Large System: Upgrade Procedures (553-3021-258)
•Succession 1000 System: Upgrade Procedures (553-3031-258)
Table 1
Meridian 1 systems to Succession 1000M systems
This Meridian 1 system...
Maps to this
Succession 1000M system
Meridian 1 Option 11C Chassis Succession 1000M Chassis
Meridian 1 Option 11C Cabinet Succession 1000M Cabinet
Meridian 1 Option 51C Succession 1000M Half Group
Meridian 1 Option 61 Succession 1000M Single Group
Meridian 1 Option 61C Succession 1000M Single Group
Meridian 1 Option 61C CP PII Succession 1000M Single Group
Meridian 1 Option 81 Succession 1000M Multi Group
Meridian 1 Option 81C Succession 1000M Multi Group
Meridian 1 Option 81C CP PII Succession 1000M Multi Group

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Intended audience
This document is intended for individuals responsible for installing,
configuring, operating, administering, and troubleshooting Meridian digital
telephones, attendant consoles and add-on modules, or for engineering and
configuring digital telephone lines
Conventions
Terminology
In this document, the following systems are referred to generically as
“system”:
•Meridian1
• Succession 1000
• Succession 1000M
The following systems are referred to generically as “Small System”:
• Succession 1000M Chassis
• Succession 1000M Cabinet
• Meridian 1 Option 11C Chassis
• Meridian 1 Option 11C Cabinet
The following systems are referred to generically as “Large System”:
• Meridian 1 Option 51C
• Meridian 1 Option 61
• Meridian 1 Option 61C
• Meridian 1 Option 61C CP PII
• Meridian 1 Option 81
• Meridian 1 Option 81C
• Meridian 1 Option 81C CP PII
• Succession 1000M Half Group

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Telephones and Consoles Description
• Succession 1000M Single Group
• Succession 1000M Multi Group
The call processor in Succession 1000 and Succession 1000M systems is
referred to as the “Succession Call Server”.
Related information
This section lists information sources that relate to this document.
NTPs
The following NTPs are referenced in this document:
•Meridian Communications Unit and Meridian Communications
Adapter: Description, Installation, Administration, Operation
(553-2731-109)
•Spares Planning (553-3001-153)
•Equipment Identification (553-3001-154)
•Circuit Card: Description and Installation (553-3001-211)
•Features and Services (553-3001-306)
•Software Input/Output: Administration (553-3001-311)
•Software Input/Output: System Messages (553-3001-411)
•Software Input/Output: Maintenance (553-3001-511)
•Small System: Upgrade Procedures (553-3011-258)
•Large System: Upgrade Procedures (553-3021-258)
•Meridian Digital Telephones: M2006, M2008/M2008HF, M2616 User
Guide
•M2216ACD Telephone User Guide
•M2616CT Cordless Telephone User Guide
•Meridian Digital Telephones: M3901, M3902, M3903, M3904 User
Guide

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553-3001-367 Standard 1.00 October 2003
•Meridian Digital Telephones and Options: M2006, M2008/M2008HF,
M2616, M2216ACD, M2016S Secure Set Quick Reference Guide
•M2317 Quick Reference Card
•Meridian Digital Telephones: M3902, M3903, M3904 Quick Reference
Guide)
•Asynchronous Data User Guide
•Meridian Programmable Data Adapter User Guide
•Meridian Communications Adapter User Guide
•Installing the Analog Terminal Adapter
•Analog Terminal Adapter Quick Reference Card
•Meridian 1 Attendant PC: Software User Guide
For information on Succession i2000 Series Internet Telephones, refer
to Internet Terminals: Description (553-3001-368).
Online
To access Nortel Networks documentation online, click the
Technical Documentation link under Support on the Nortel Networks
home page:
http://www.nortelnetworks.com/
CD-ROM
To obtain Nortel Networks documentation on CD-ROM, contact your
Nortel Networks customer representative.

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Meridian Digital Telephones
Contents
This section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Functional description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introduction
Meridian Digital Telephones are connected to the system through a 2-wire
loop carrying two independent 64 kb/s PCM channels with associated
signaling channels. One of the two PCM channels is dedicated to voice, while
the other is dedicated to data traffic. Line cords and handset cords on all
Meridian digital telephones are equipped with snap-in TELADAPT
connectors for quick and easy connecting procedures.
The telephone interfaces with the Digital Line Card (DLC).
Functional description
This section describes the features and capabilities of Meridian Digital
Telephones.
Volume control
Speaker volume (or piezo-disc transducer volume in digital telephones not
equipped with a Handsfree unit) is controlled by one key with two toggle
positions. Operating the “Volume Up” or “Volume Down” pad of the key

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increases or decreases the volume for the tone or sound which is currently
active.
Line engineering
Meridian Digital Telephones operate through twisted pair wiring. The
maximum permissible loop length is 3500 ft. of 24AWG standard twisted
wire with no bridge taps.
Local alerting tones
Four alerting tones and a buzz sound are provided. The alerting tone cadences
cannot be changed from the telephone, but can be altered for individual
Meridian Digital Telephones by software controlled adjustments in the
system. Refer to Software Input/Output: Administration (553-3001-311) and
Software Input/Output: Maintenance (553-3001-511) for more information.
All other tones such as dial tone or overflow tones, are provided by the system
from a Tone and Digit Switch.
Alerting tone characteristics
The tone frequency combinations are as follows:
Note: A 500 Hz buzz signal is provided for incoming call notification
while the receiver is off-hook.
Power requirements
Both the M2009 telephone and M2018 telephone are loop powered. Loop
power uses +15 V and -15 V sources, and assumes 3500 feet maximum loop
length of 24 AWG wire and a minimum of 13.5 V at the telephone terminals.
Tone Frequencies Warble rate (Hz)
1 (667 Hz, 500 Hz) 10.4
2 (667 Hz, 500 Hz) 2.6
3 (333 Hz, 250 Hz) 10.4
4 (333 Hz, 250 Hz) 2.6

Meridian Digital Telephones Page 19 of 532
Telephones and Consoles Description
The Handsfree unit, which is integrated in the Meridian M2112, requires an
auxiliary power supply. Power can be obtained from either a QUT1 25 V AC
closet power supply or a local plug-in transformer (AO273077) over a
separate pair of wires.
If the power supply fails, Handsfree will not operate, but all other features
will continue to function, provided the power failure does not affect the
system. The loop-powered functions of all Meridian digital telephones
remain operational only if the system is equipped with a backup battery.
Additional power is obtained over a separate pair of wires. Maximum
Handsfree current is 110 mA with a minimum of 16 V AC to be present at the
telephone terminal. The following rules apply:
• For the QUT1 closet power supply: (compatible with SL-1 sets only)
— The power supply loop for the Handsfree unit should follow the
same rules as the loop power requirements, that is, the maximum
allowable loop length and wire gauge are 3500 ft. of 24 AWG wire.
— Each M2112 Handsfree must be powered by one tap of one winding,
however, it is permissible to connect two (2) 12.5 V AC windings in
series to provide 25 V AC power for Handsfree.
• For the local plug-in transformer:
— A single winding transformer equipped with a 3 m (10 ft.) cord of 22
AWG two-conductor stranded and twisted wire with a modular
duplex adapter (NE-267QA) at the end is required.
— The following minimum specifications have to be met by this
transformer:
Asynchronous Data Option (ADO)
For more information on the Asynchronous Data Option, see “M2000 data
options” on page 193.
— No load output voltage: 21 V AC max.
— Voltage at rated current: 16 V AC ±10%
— Rated load current: 375 mA

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Data
If the Asynchronous Data Option (ADO) is installed, an external power
supply is needed in addition to the power from the line (see Table ). A 110 V
AC 60 Hz, 100 V AC 50/60 Hz or a 220 V AC 50 Hz multi-output power
supply unit provides nominal voltages of +5 V, +12 V and -12 V DC. The
power supply connects to the back of the telephone through a 5-pin Molex
power connector.
Discrimination
If the AC power supply fails, data calls cannot be processed. All external
power supplies are equipped with short circuit and thermal shutdown
protection.