Comdial DX-120 Technical Manual

Installation and Maintenance Manual

Technical Manual - Volume I

DX-120 Installation and Maintenance Manual

Technical Manual - Volume I

Copyright © January, 2007 Vertical Communications, Inc.

All rights reserved. Unauthorized use of this document is prohibited.

Vertical Communications, Inc.

106 Cattlemen Road, Sarasota, FL 34243

[phone] or (800) 266-34 25

-Notice-

Vertical Communications, the Vertical Communications logo and combinations thereof,

and Corporate Office are trademarks ofVertical Communications, Inc. Artisoft, TeleVantage, InstantOffice,

Comdial and Vertical Networks are registered trademarks of Artisoft, Inc.

All other brand and product names are used for identification only

and are the property of their respective holders.

.

DISCLAIMER

This manual has been developed by Vertical Communications, Inc. (the “Company”) and
is intended for the use of its customers, potential customer s, and service personnel. The
information in this manual is subject to change without notice. While every effort has been
made to eliminate errors, the Company disclaims liability for any difficulties arising from
the interpretation of the information contained herein.

The information contained herein does not purport to cover all details or variations in
equipment or to provide for every possible contingency to be met in connection with instal­lation, operation, or maintenance. Should further information be desired, or should p artic­ular problems arise which are not covered sufficiently for the purchaser’s purposes,
contact V ertical Communications, Inc.

DX-120 Installation and Maintenance Manual

TABLE OF CONTENTS

SAFETY AND REGULATORY CONSIDERATIONS

SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Protecting Against Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Complying with Underwriters Laboratories Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

FCC and Industry Canada (IC) Rules and Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SECTION 1 - INTRODUCTION

USING THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Locating Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

System Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Key Service Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

CPM (Central Processor Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

408M (KSU1 Component) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

408E (KSU II Component) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

APM4 (Analog Port Module - 4 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DPM8 (Digital Port Module - 8 Circuits). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

DPM16 (Digital Port Module - 16 Circuits). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

COM4 (Central Office Module - 4 Circuits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

MDM (Modem Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

AAM (Automated Attendant Module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

T1 Card (T1 Module) Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

ISDN Card (T1/PRI Module) Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

DET (Digital Executive Telephone) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

DSS (Direct Station Selection) Console. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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Table of Contents (continued on next page)

TABLE OF CONTENTS DX-120 Installation and Maintenance Manual

Table of Contents (continued)

SECTION 2 - INSTALLATION

INSTALLING THE DX-120. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Site Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Tools and Supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Preparing the Main Distribution Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

KSU Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Typical MDF Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

KSU Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Adding an APM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Adding a COM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Adding an MDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Adding an AAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Adding a KSU2 Second Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Adding a Music Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Adding an External Pager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Add a Loud Bell Control or Gate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Adding a DPM16 (Digital Port Module – 16 port). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Adding a T1 or ISDN (T1/PRI) Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Connecting a Serial Cable for PC-DBA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Connecting a Serial Cable for SMDR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Power-up Initialization (Cold Start). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

SECTION 3 - MAINTENANCE & TROUBLESHOOTING

SYSTEM MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Cleaning the Telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

TECHNICAL PROBLEM SOLUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Problems Not Related to System Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Diagnostic Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

MAINTENANCE UTILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Loading PC-DBA software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

CONNECTING TO THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Cable Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Connecting PC-DBA to the DX-120 Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Establishing a Modem Connection with PC-DBA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

ACCESSING PC-DBA MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Maintenance Utilities (Menu Items) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Table of Contents (continued on next page)

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DX-120 Installation and Maintenance Manual TABLE OF CONTENTS

Table of Contents (continued)

SECTION 4 - INSTALLATION ISSUES

TROUBLESHOOTING INSTALLATION ISSUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113

Corrupted Database on Initial System Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Adding Hardware to an Existing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Voice Mail Doesn’t Work (“No Legal Member” Error). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Invalid Entries Calling a Busy Station (Issues with Multiple Mailbox Greetings) . . . . . . . . . . . . . 117

Ensuring Optimum Call Handling Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Ringing a Group Of Phones

Before Routing the Call to Auto-Attendant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Using Multiple Lines &

Assigning Different Auto-Attendant Greetings for Each Line. . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Setting Up Message Delivery to a Cell Phone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Using Prime CO Instead of Intercom with Modem or Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Digits Passed Inband to the Voice Mail in an Overflow 1 Condition . . . . . . . . . . . . . . . . . . . . . . 129

Digits Passed Inband to the Voice Mail in an Overflow 2 Condition . . . . . . . . . . . . . . . . . . . . . . 130

Digits Passed Inband to the Voice Mail in a Re-Route Condition . . . . . . . . . . . . . . . . . . . . . . . . 131

INDEX

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133

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DX-120 Installation Manual - Technical Manual Vol I

SAFETY AND REGULATORY CONSIDERATIONS

SAFETY

Protecting Against Static Electricity

CAUTION

Circuit boards are susceptible to damage caused by electrost atic discharge. You
must keep this in mind as you handle the circuit boards. Refer to Vertical
publication IMI01-005, Handling of Electrostatically Sensitive Components, for
general information. Specific handling precautions are also included in this
installation manual.

The telephone system may include some installed circuit boards when it arrives at your site. The equipment
cabinets provides universal slots that will accept either line or station boards.

When removing or installing circuit boards in the cabinets, you must wear a static discharge wris t strap. Be sure
that the strap is touching bare skin and is connected to an AC or earth ground.

Disconnect the AC power cord from the AC outlet (or extenral battery back-up system if applicable) before you
remove or install the circuit board.Whenever you remove a circuit board fr om a cabinet, immediately place the
board in a static protection bag while you still have your wrist strap in place and properly grounded.

When removing circuit boards from an installation location for servicing, always transport them to a static-safe
work area in static protection bags. If you do not already have a static-safe work area, you can create one by
arranging a work area as detailed in the illustration.

ESD Protective Mat

ESD Protective

Work surface

Static Wrist Strap

Common Point Ground

Typical Earth Ground

ESD Protective Mat

- 1 -

REGULATIONS DX-120 Installation Manual - Technical Manual Vol I

REGULATIONS

Complying with Underwriters Laboratories Regulations

Per the Underwriters Laboratories regulation 1950, be aware of the following precautions when installing telephone
equipment that is to be directly connected to the telephone company network:

• Never install telephone wiring during a lightning storm

• Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations

• Never touch uninsulated telephone wires or terminals u nless the telepho ne line has been disconnected at the

network interface

• Use caution when installing or modifying telephone lines

• Avoid using a telephone (other than a cordless type) during an electrical stor m—there may be a remote risk of

electrical shock from lightning

• Do not use the telephone to report a gas leak in the vicinity of the leak.

• TNV wiring to outside plant leads (e.g., central office trunk wiring) must be 2 6 AWG gauge minimum.

FCC and Industry Canada (IC) Rules and Regulations

FCC PART 15 RF EMISSION INFORMATION

This equipment contains incidental r adio freque ncy generati ng circuitry and, if not installed and used properly, may
cause interference to radio and television reception . This eq uipment has be en tested and found to co mply with the
limits for a Class A computing device pursuant to Subpart J of Part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against such interference when operated in a
commercial environment. Operation of this equipment in a residential area may cause interference to radio and
television reception; in which case the user is encouraged to take whatever measures may be required to correct
the interference.

If this equipment does cause interference to radio and television reception, wh ich can be de termined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the following
measures: reorient the television or radio receiving antenna, and/or relocate the system, the individual telephone
stations, and the radio or television with respect to each other.

If necessary, the user should consult the manufacturer or an experienced radio/television technician for additional
suggestions. The user may find the following booklet prepared by the Federal Communications Commission
helpful: “How to Identify and Resolve Radio-TV Interference Problems.” This booklet is available from the
Government Printing Office, Washington, DC, 20402. Stock No. 004-000-00345-4.

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FCC Regulations (continued on next page)

DX-120 Installation Manual - Technical Manual Vol I REGULATIONS

FCC Regulations (continued)

FCC PART 68 INFORMATION

This equipment complies with Part 68 of the FCC Rules. A label, located on the exterior lower left side of the
cabinet, contains the FCC Registration Number(s) and Ringer Equivalence Number (REN).

Notify the local telephone company when you connect the equipment to the network and provide the information
shown in the following table:

Line Type

Loop Start 9.0F 02LS2 See Equipment

T1 Line 6.0Y 04DU9–1SN N/A RJ48C
ISDN (T1/PRI) Line 6.0Y 04DU9–1SN N/A RJ48C

Service Order

Code*

Facilities Interface

Code

Ringer

Equivalence

Number*

Specification Sheet

Universal

Service Order

Code

Connector

RJ1 1

NOTE

State tariffs do not permit ground start operation for KF registered
equipment (key system operation). Ground start operation is only
permitted for MF registered equipment (KTS/PBX hybrids with both
manual and pooled outgoing and incoming access to the network).
The system must

be configured for MF operation when using

ground start operation

This equipment may not be used on coin service provided by the telephone company. Connection to party lines is
subject to state tariffs.

Should the equipment cause harm to the telephone network, the telephone company may disconnect your service
temporarily. If possible, they will notify you in advance. If advanced notice is not practical, they will notify you as
soon as possible. You will be informed of your right to file a complaint with the FCC. The telephone company may
make changes in its facilities, equipment, operations or procedures that could affect the proper functioning of your
equipment. If they do so, they will notify you in advance to give you an opportunity to maintain uninterrupted
telephone service. In addition, the telephone company may ask that you disconnect this equipment from the
network until the problem has been corrected or until you are sure that the equipment is not malfunctioning.

- 3 -

FCC Regulations (continued on next page)

REGULATIONS DX-120 Installation Manual - Technical Manual Vol I

FCC Regulations (continued)

TERMS AND DEFINITIONS

Service Order Code (SOC)

Defines type of service and system protection.

EXAMPLES

• 9.0F = analog service, full protection to the network from systems using live

voice. Only registered terminal equipment can be connected to station ports.

• 6.0Y = digital service, provides total protection, including billing protection and

encoded analog content.

Facilities Interface Code (FIC)

A tariff reference used by customers to order correct facilities to be provided by the telco.

EXAMPLES

• 02LS2 = analog service, 2-wire, local switched access, loop-start

• 02RV2-T = analog service, 2-wire, local switched access, reverse-battery

• 04DU9-1SN = digital service, 1.544 Mbps ANSI ESF and B8ZS without line

power

Ringer Equivalence Number (REN)

Useful in determining the quantity of devices that may be connected to the telephone line and still have all of those
devices ring when the telephone number is called. In most, but not all areas, the sum of the REN’s of all devices
connected to one line should not exceed five (5.0). To be certain of the number of devices that you may connect to
your line, you may want to contact your local telephone company to determine the maximum REN for your calling
area.

Universal Service Order Code Connector (USOC Code)

Defines the FCC Part 68 approved telco provided connector, electrically and mechanically, required to interface
with the customer equipment. To avoid legal, warranty, insurance, and casualty problems, do not pass anything
through the network connector other than those permitted in the FCC Part 68 RJ series connectors. Definitions of
connectors are as follows:

EXAMPLES

• RJ21X is a 25 line, 2-wire, T/R, 50 position connector,

• RJ48C is a single line, 4-wire, T/R, T1/R1, 1.544 Mbps, 8-position connector.

- 4 -

Regulations (continued on next page)

DX-120 Installation Manual - Technical Manual Vol I REGULATIONS

Regulations (continued)

INDUSTRY CANADA RF EMISSION INFORMATION

This digital device does not exceed the Class A limits for radio noise emissions from digital apparatus set out in
Radio Interference Regulations of Industry Canada.

Le pre’sent appareil nume’rique n’emet pes de bruits radioe’lectriques de’passant les limits applicables aux
appareils nume’riques de la class A prescrites dans le Re’glement sur le brouillage radioe’lectrique e’dicte’ par le
ministe’re des Industry Canada.

INDUSTRY CANADA TELCO INFORMATION

NOTICE: The Industry Canada label identifies certified equipment. This certification means that the equipment

meets certain telecommunications netwo rk protective, opera tional and sa fety requ iremen t s. Industry Canada does
not guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should be sure that it is permissible to be connected to the facilities of the
local telecommunications company. The equipment must also be installed using an acceptable method of
connection. In some cases, the company’s inside wiring associated with a single line individual service may be
extended by means of a certified connector assembly (telephone extension cord). The customer should be aware
that compliance with the above condition may not prevent degradation of service in some situations.

Repairs to some certified equipment should be made by an authorized maintenance facility designated by the
supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the
telecommunications company cause to request the user to disconnect the equipment.

Users should be sure for their own protection that the electrical ground connections of the power utility, telephone
lines and internal metallic water pipe system, if present, are connected together. This precaution may be
particularly important in rural areas.

CAUTION

Users should not attempt to make such connections themselves, but should
contact the appropriate electrical inspection authority, or electrician, as
appropriate.

NOTICE

The ringer equivalence number (REN) assigned to each terminal d evice provides
an indication of the maximum number of terminals allowed to be connected to the
telephone interface. The termination on an interface may consist of any
combination of devices subject only to the requirement that the sum of the ringer
equivalence numbers of all the devices does not exceed 5.

Industry Canada TELCO Information (continued on next page)

- 5 -

REGULATIONS DX-120 Installation Manual - Technical Manual Vol I

Industry Canada TELCO Information (continued)

AVIS

L’etiquette de Industrie Canada identifie le materiel homologue. Cette etiquette
certifie que le materiel est conforme a certaines normes de protection,
d’exploitation et de securite des reseaux de telecommunications. Le Ministere
n’assure toutefois pas que le materiel functionnera a la satisfaction de l’utilisateur.
Avant d’installer ce materiel, l’utilisateur doit s’assurer quil est permis de le
raccorder aux installations de l’entreprise locale de telecommunication.

Le materiel doit eqalement etre installe en suivant une methode acceptee de
raccordement. L’abonne ne doit pa s oublier qu’il est possible que la conformite
aux conditions enoncees ci-dessus n’empeche pas le degradation du service
dans certaines situations. Les reparations de materiel ho mologue doivent etre
effectuees par un centre d’entretien ca nadien autorise desig ne par le fournissu er .

La compagnie de telecommunications peut demander a l’utilisateur de
debrancher un appareil a la suite de reparations ou de modifications effectuees
par l’utilisateur ou a cause de mauvais fonctionnement. Pour sa propre
protection, l’utilisateur doit s’assurer que tous les fils de mise a la terre de la
source d’energie electrique, des lignes telephoniques et des canalisations d’eau
metalliques, s’il y en a, sont raccorde ensemble. Cette precaution est
particulierement importante dans les regions ruales.

AVERTISSEMENT

L’utilisateur ne doit pas tenter de faire ces raccordements luimeme; il doit avoir
recours a un service d’inspection des installations d’inspection des installations
electriques, ou a un electricien, selon le cas.

AVIS

L’indice d’equivalence de la sonnerie (IES) asssigne a chaque dispositif terminal
indique le norbre maximal de terminaux qui peuvent etre raccordes a une
interface. La terminaison d’une interface telephonique peut consister en une
combinaison de quelques dispositifs, a la seule co ndition que la som me d’indices
d’equivalence de la sonnerie de tous les dispositifs n’excede pas 5.

- 6 -

DX-120 Installation and Maintenance Manual

SECTION 1 - INTRODUCTION

USING THIS MANUAL

This publication contains a technical discussion of the digital telephone system. It provides step-by-step
instructions for installation. You should become familiar with this manual before you attempt to install the system.
This manual provides the following information:

• Regulatory and Safety Considerations

• Description of the hardware

• An understanding of the operational characteristics of the system hardware compon ents

• Instructions for installing the cabinet, printed circuit boards, and ancillary equipment

HINT

It is also a good idea to review the companion document for this Insta llation Manual:
DX-120 Programming and Maintenance Manual - Technical Manu al Vol II.

All of the Vertical publications are available for download from Vertical’s Customer Care Center, located at http://
www.vertical.com/ccc. Should you need hard copies of these publications, contact your Vertical inside sales
representative.

Vertical Communications, Inc.

Inside Sales Department

106 Cattlemen Road

Sarasota, Florida 34232

1-800-Comdial

- 7 -

USING THIS MANUAL DX-120 Installation and Maintenance Manual

Locating Documentation

Vertical tech nical publications are numbered according to their intended function. Various publications pertaining
to the products offered by Vertical can be found at http://vertical.com/ccc. If you are unfamiliar with the CCC,
please contact Technical Support for details about logging in.

Document Prefix Document T ype Purpose

AG Attendant Guide Contains information required for pro-

gramming and using a system attendant.

FLDII Field Installation Instructions Contains basic information as a quick ref-

erence for programming in the field (vs.
remote programming)

GCA General and Descriptive Information

(generally refers to Vertical documents
created or edited prior to 11/06)

IMI
or
IM

PRG

or

PRGM
PRN Product Release Notice Contains information about any new prod-

QR Quick Reference Provides concise, abbreviated installa-

SAB Service Advisory Bulletin Provides information to alert the field

SRN Software Release Notice Provide information about a new software

SUPG Supervisor’s Guide Provides information specific to supervi-

Installation and Maintenance
Instructions

Programming Instructions Provides programming information

Provides general information for the oper­ation of features or hardware. This may
include programming manuals as well as
user guides.

Provides instructions for Installing and
Maintaining various Vertical (Comdial)
products.

required for a particular product.

uct that may have recently been released

tion, programming, or operating informa­tion in a one or two page document.

about specific service related issues.

release. These notices may be for new
feature releases or maintenance.

sor’s on particular systems that allow a
supervisor to use and program a variety of
additional features.

TAB Technical Advisory Bulletin Publications that are intended to offer spe-

cific technical information related to a par­ticular product.

UG User Guide Provides information specific to end-users

(e.g., those who use a phone at their desk
vs. someone who installs and/or programs
the system).

- 8 -

DX-120 Installation and Maintenance Manual OVERVIEW

OVERVIEW

The Vertical DX-120 is a fully digital hybrid key telephone system. The DX-120 uses a mix of “loop start” central
office (telephone company) line interfaces and digita l lines such as T1 or ISDN (T1-PRI), along with a mix of analog
and digital extension ports to provide office communications and connectivity to the Public Switched Telephone
Network (PSTN).

The DX-120 delivers a vast array of office productivity features and telephone use enhancing features, including
Caller Identification (requires telephone company subscription), in the standard package. Unlike most systems that
support Caller ID, the DX-120 supports Caller ID to DX-120 proprietary digital extensions and to third-party, Caller
ID capable analog devices (cordless telephones, etc.)

Although most features are standard, the DX-120 provides for several optional features to further enhance office
communications. Built-in voice processing integration packages include:

• Automated Attendant

• Four port, Flash-based Voice Mail/Auto Attendant (expandable to 8 ports)

• Four port, Hard drive-based Voice Mail/Auto Attendant (expandable to 8 ports)

The DX-120 platform allows you to use these voice processing platforms without losing valuable system port
resources.

The DX-120 is comprised of an application config ured, exp andable Key Service Unit (KSU) platform. There is one
fully-featured Digital Executive Telephone (DET) that delivers access to all system functions. The system
architecture provides an expandable interface for digital port growth and analog port growth. The basic
configuration supports both device types. Analog ports might be used for plain old telephones, fax machines,
modems, etc. The DX-120 is designed to meet the telecommunications needs of small-to-medium business
offices.

System Technology

• The DX-120 incorporates state-of-the-art digital technology for voice switching and call processing, using

Pulse Code Modulation and Time Division Multiplexing (PCM/TDM).

• The DX-120 is a non-blocking switch, with no loss or degradation of voice signals.

• The system is stored-program control and uses a ARM7 main microprocessor and peripheral devices

(extensions and CO lines) in a distributed processing configuration.

• Memory consists of 640K bytes of ROM (Read Only Memory) and 384K bytes of RAM (Random Access

Memory). The RAM is lithium battery protected.

• The maximum system configuration is 16 loop start, 24 digital lines, 88 extensions (80 digital and 8 analog)

and 8 voice processing channels.

- 9 -

System Technology (continued on next page)

OVERVIEW DX-120 Installation and Maintenance Manual

System Technology (continued)

AVAILABLE EQUIPMENT FOR THE DX-120

DEVICE PART # CHARACTERISTICS

KSU1 7201 8 digital extension ports

4 analog device ports
4 CID-ready CO line ports.
2 music source inputs, can be assigned as desired to CO lines for hold music/messages
1 power failure port (CO line 1).
1 control contact (LBC, Gate, External Page Control)
1 external paging equipment interface
2 serial ports
PC-DBA programming
SMDR (Station Message Detailed Recording)

OPTIONAL EQUIPMENT
KSU2 7202 • Used to expand the system capacity beyond KSU1 limits.

• 8 digital extension ports

• 4 CO line ports

• 1 power failure port (CO line circuit 1).

DPM8 7220 • Digital Port Module - 8 circuit

• Installs into KSU1 or KSU2

APM4 7230 • Analog Port Module - 4 circuit

• Always factory-installed into KSU1; can also be connected to KSU2 via dedicated cable

COM4 7210 • CO line Module - 4 circuit with one power failure port on first CO line circuit

• Installs into KSU1 or KSU2

MDM 7249 • Modem Module, for use with off-site programming.

• Installs into KSU1 only.

AAM 7240 • Automated Attendant Module

• 4 port, one menu for routing

• 10 announcements for various caller greetings. Installs into KSU1 only

DPM16 7221 • Digital Port Module - 16 circuit

• Installs into KSU1 or KSU2

T1 7 290 • T1 Dig ital Trunking - 24 channels
ISDN

(T1/PRI)
CO DX FLASH VM7271C • Flash-based, 4-port Voice Mail (Corporate Office DX) with Auto Attendant.

7285 • ISDN (T1/PRI) Digital Trunking - 23 channels plus D-channel

• 1.5 hours storage and 100 mailboxes.

CO DX HD VM 7270C • Hard Drive-based, 4-port Voice Mail (Corporate Office DX) with Auto Attendant and on-

board modem.

• 100 hours storage and 100 mailboxes.

CO DX 4-port
Expansion VM

7273 • 4 port expansion to 7271C or 7270C.

- 10 -

DX-120 Installation and Maintenance Manual OVERVIEW

Configuration

The Vertical DX-120 platform is comprised of one full-featured key telephone model and two modular KSUs (Key
Service Units). Several modules are available for enhanced system applications and configuration expandability.

KSU1 COMPONENTS

The CPM (Central Processor Module) is installed inside of KSU1 and connected to the 40 8M r ibbon cable J4 (also
labeled “To CPM”).

• The CPM contains:

- Two serial ports

- Two music ports

- One control contact (external paging/LBC/gate control)

- One external page equipment interface connection

- Socket connectors for the KSU2 (labeled “2nd Cabinet”), MDM, and VP modules (AAM, 7271C, and

7270C)

• The standard 408M (part of 7201) contains:

- 4 CO line ports

- 1 power failure transfer port for the first CO line circuit

- 8 digital ports

- a ribbon cable (J1, also labeled “COM4”) for connection to the COM4 module (PN 7210) in KSU1

- ribbon cable sockets (J2 and J3, also labeled “To DPM8”) for connection of DPM8 (PN 7220) or

DPM16 (PN 7221) module

• The standard APM4 (part of 7201) contains four analog device ports (installed on ribbon cable J5, also

labeled “APM4”)

KSU2 COMPONENTS

The standard 408E contains:

• 4 CO line ports

• 1 power failure transfer port for the first CO line circuit

• 8 digital ports

• a ribbon cable J1, also labeled “COM4”) for connection to the COM4 module (PN 7210)

• ribbon cable sockets J2 and J3, also labeled “To DPM8”) for connection of DPM8 (PN 7220) or

DPM16 (PN 7221) module

• a shielded cable (J4) for connection to CPM socket JP2 (also labeled “2

nd

Cabinet”) in KSU1

Configuration (continued on next page)

- 11 -

OVERVIEW DX-120 Installation and Maintenance Manual

Configuration (continued)

VOICE PROCESSING MODULES

The DX-120 provides several voice processing (or voice mail) options. The optional voice processors that you can
add to the DX-120 are fixed system resources that do not require peripheral device ports (analog or digital). This
significant advantage means that the DX-120 VP options can be added to any DX-120 configuration without “port
loss” thus eliminating the ill effects of reducing the overall capacity of the system when the voice processor is
connected. Because the DX-120 doesn’t use conventional peripheral port s to interface the VPs, we refe r to the VP
connectivity in terms of “channels.”

• AAM (Automated Attendant Module): The AAM provides four channels for automated attendant operation

only. The AAM is then capable of handling four calls simultaneously. Callers answered by the AAM are
greeted by one of four greetings associated with the DX-120 mode of operation (Day / Evening / Alternate /
Temporary). Various other announcements are also included for caller processing, refer to the DX-120
Technical Manual, Volume II, Programming for fu rther details.

• 7271C (Flash-based, four port VM with Automated Attendant): The 7271 provides four channels for

automated attendant and voice mail operation. The 7271 is equipped to support up to 100 voice mailboxes
and 3.2 hours of message storage (including the various greetin g announcements).

• 7270C (Hard Drive-based, four port VM with Automated Attendant): The 7270C provides four channels

for automated attendant and voice mail operation. The 7270C is equipped to support up to 2000 voice
mailboxes and 150 hours of message storage (including the various greeting announcements).

• 7273 (Four port expansion card): T he 727 3 is added to th e 7271 C or 7270 C to increa se the tot al nu mber of

voicemail ports from four (4) to eight (8).

NOTE

• For details on installing the 7271C and 7270C refer to the Corporate Office DX

Installation Instructions.

• All of the these voice proces so rs ar e co nn ec te d to th e DX-1 2 0 CPM via

specific interface sockets.

- 12 -

Configuration (continued on next page)

DX-120 Installation and Maintenance Manual OVERVIEW

Configuration (continued)

CONFIGURATION TABLE

SYSTEM CONFIGURATION

Equipment

KSU1*

7201P-00
71201P-04

(one APM4
included as
standard)

T1 or Digital Analog Digital Analog

COM4 DPM8 DPM16 ISDN APM4 Trunks Trunks Stations Stations

484
14164
24244
11 4 32 4

1884
11 8 16 4
12 8 24 4
111 8 32 4

14244

24404
11 8244
12 8404

1 24 \ 23 4 8 4
1124 \ 234164
2124 \ 234244
111 24 \ 234 32 4

1124 \ 23884
1 1 1 24 \ 23 8 16 4
1 2 1 24 \ 23 8 24 4
1111 24 \ 238 32 4

11 24 \ 234 24 4

21 24 \ 234 40 4
1 1 1 24 \ 23 8 24 4
1 2 1 24 \ 23 8 40 4

*This configuration does not allow space for voicemail.

System Configuration (continued on next page)

- 13 -

OVERVIEW DX-120 Installation and Maintenance Manual

SYSTEM CONFIGURA TION (continued)

Equipment

COM4 DPM8 DPM16

T1 or Digital Analog Digital Analog
ISDN

APM4

Trunks Trunks Stations Stations

KSU1*

7201P-08

KSU2

7202P-00

adds to
KSU1

configuration

(KSU2 does
not come with
an APM4.

However, one
can be added
via the dedi­cated cable)

1 24 \ 23 4 8 4

1124 \ 234164

11 24 \ 234 24 4

48
1416
2424
11 4 32

188
11 8 16
12 8 24
111 8 32

1424
2440

11 824
12 840

1484
114164
214244
11 1 4 32 4

11884
11 1 8 16 4
12 1 8 24 4
111 1 8 32 4

11 4244

21 4404
111 8244
121 8404

Maximum Capacity KSU1 24 8 40 4
Maximum Capacity KSU2

8 40 4

TOTAL SYSTEM CAPACITY 24 16 80 8

*This configuration does not allow space for voicemail.

- 14 -

DX-120 Installation and Maintenance Manual OVERVIEW

Key Service Unit

The DX-120 Key Service Unit (KSU) is a modular flat-pack design. Two KSU’s (KSU1 and KSU2) may be
equipped to achieve the total system capacity of 16 loop start, 24 digital lines, 88 extensions (80 digital and 8
analog) and 8 voice processing channels. KSU1 is factory equipped with one 408M, one APM4 and the CPM.
KSU2 is factory equipped with one 408E.

Each KSU is a self-contained cabinet with internal power supply . The power supply AC transformer voltage switch
can be set for either 117vac or 230vac operation. (It is factory set for 117vac operation.) The KSU is designed to
be mounted on the wall and is shipped with a wall mounting template. The compact KSU weighs less than 20
pounds and is UL Listed.

DX-120 Key Service Unit (KSU)

You can remove:

• Or reposition four panels installed over various KSU openings to accommodate
exterior connection requirements.

• One panel to route a serial cable through the KSU outer housing for connection of
ancillary SMDR equipment.

• Another panel to route a serial (NULL Modem) cable through the KSU outer housing
for direct connection of a PC for on-site PC-DBA programming.

• Or reposition the remaining KSU panel to accommodate cables entering through the
outer housing for connecting station/extension cables or to the MDF.

• The panel covering the jacks on the phone boards (located under the left side of the
main board).

NOTE

From the exterior, with covers in place, the KSU1 and KSU2 look identical.
However, KSU1 contains the CPM (system call processing).

- 15 -

OVERVIEW DX-120 Installation and Maintenance Manual

Power Supply

The power supply circuitry of the DX-120 incorporates a linear design AC transformer with a choice of input
voltage. The voltage selector switch is shippe d set for 117vac applications; you can also set this switch for 230vac
applications. Since the power supply is linear in design, the output voltage varies between 21.6vdc and 32vdc
depending on load and stability of the input voltage. The output voltage is delivered to the 408M (in KSU1, 408E in
KSU2) for voltage regulation. All system operation and logic volt ages are produced at the 408M/E.

Voltage Selector Switch

• Two fuses are equipped on the power supply board, one for AC input over-voltage
protection and one for DC output over-current protection.

• A main power switch is accessible when the KSU cover is in place. In the event
battery backup operation is desired the KSU power cord can be connected to a
external (ancillary) UPS (Uninterrupted Power Supply).

IMPORTANT!

It is your responsibility to match the battery requirements/UPS requirement to the
specific needs of the equipment owner. To determine the battery requirement
needs and UPS requirement, see see “Specifications” to find the current draw
and necessary Amp/Hour back up support that the battery/UPS must supply.

- 16 -

DX-120 Installation and Maintenance Manual OVERVIEW

CPM (Central Processor Module)

The CPM module is equipped standard in KSU1. This board contains all circuitry required to control the fully
equipped DX-120. The system uses the CPM to perform all digital voice switching and call processing data
switching.

The CPM has one ribbon cable connector for connection to the KSU1 408M and six (6) connector sockets for
connection of the system built-in modem, voic e pr oc essor, and second cabinet (KSU2). Since the CPM comes
installed inside of KSU1 the CPM ribbon cable is already in place and connected to the KSU1-408M J5 socket.

Assuming the orientation of the KSU1 cabinet is inst alled on the wall; the two horizontal connector sockets in the
upper right corner of the CPM are for the MDM (Modem Module). The connector socket labeled “2nd Cabinet” is
for connection to theKSU2/408E if that expansion is required. The remaining two connector sockets on the CPM,
one at the left side, the other at the right side are for the voice processor solution.

NOTE

The voice processor solution can be any of three possible choices: AAM, 7271C,
or 7270C.

• The CPM also provides the following standard connectors:

- Music Channel 1 - On Hold/Background Music Interface

- Music Channel 2 - On Hold/Background Music Interface

- Control Contact (Loud Bell / Door / External Page Control)

- External Paging Equipment Interface

- RMP Serial Port - for onsite PC-DBA system database programming

- SMDR Serial Port - for connection to ancillary SMDR/Call Accounting equipment

- T1 or ISDN (T1/PRI)

• The CPM has two option strap jumpers one for d atabase st art-up (JE1 ) and one for music cha nnel one source

(internal/external) selection (JPC1).

- JE1 Cold Start/Normal is used to force load database default factory settings. This jumper will normally

never require operation af ter the in itial power up sequence is completed. However should the need ar ise
to return the site database to the factory settings this jumper is used to perform a cold start.

- JPC1 Internal/External is used to select the Music Channel 1 source. The DX-120 provides a

synthesized music source for music on hold, in applications where no music source is available. The
synthesized tune is repeated. JPC1 is in the “EXT” (i.e, external) position when it ships from the factory.

- 17 -

OVERVIEW DX-120 Installation and Maintenance Manual

408M (KSU1 Component)

The 408M is the large circuit board that is packaged inside of KSU1. The 408M provides interface for up to four
loop-start CO lines and 8 digital extension ports. Additionally the 408M regulates the 24 volt DC power from the
source to produce all required logic voltages and operations voltages. There is also a Power Failure Port located
on the 408M that is connected to the first CO line circuit. Whenever power fails, this port becomes active with dial
tone from the CO line connected to the fir st CO line port.

APM4 Ribbon

8 Digital

Extension Ports

Cable

CPM Ribbon

Cable

Power Failure

Port

COM4 Ribbon

Cable

4 Loop Start Co

Line Ports

KSU1 shown with cover – CPM and APM4 removed (408M exposed)

• The 408M is equipped with a heartbeat LED that indicates processing activity on the PCB. The 408M

peripheral processor is operating when the heartbeat LED is flashing. The KSU1 operation LED (located
next to the power switch) is tied to the 408M heartbeat LED. Therefore, when the LED next to the power
switch is flashing, the 408M is active.

• The KSU1-408M has three ribbon cables:

- located at the upper right and oriented in a h orizont al position, the J1 cable is used to interface a COM4 if

required to expand the system CO line capacity .

- located at the upper center and orien ted in a vertical position , the J4 cable is use d to interface the DX-120

CPM.

- located at the upper center and oriented in a vertical position, the J5 cable connects to the standard

APM4 installed in KSU1.

• Each CO line circuit incorporates over-voltage protection, ring detector, loop detector, loop/pulse-dial relay,

current sink circuit, coupling/isolation transformer (impedance 600:600), hybrid circuit, CODEC & filter,
polarity guard circuit and radio frequency noise filter.

408M - KSU1 Component (continued on next page)

- 18 -

DX-120 Installation and Maintenance Manual OVERVIEW

408M - KSU1 Component (continued)

• The fourth CO line port is equipped with CNG fax tone detection circuitry. When progra mmed as a “FAX” line,

this circuit will automatically engage the FAX Tone detector. If FAX tone is detected, the system routes the
call to the analog port designated as the destination for fax calls.

• Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a proprietary

octal ASIC (Application Specific Integrated Circuit) transceiver. There are three data ch annels in operation at
each digital port via the octal transceiver. One channel is used for call processing control of digital terminal
functions/operations and two channels are used for the digital voice channel requirements.

• Each digital station interface is protected against circuit wiring shorts by an over-current pro tection polyswitch.

The digital station circuit requires only on e cable pair to operate and is not polarity sensitive.

• Physical connection of digital extensions, power failure telephones, a nd CO lines to the 408M module is mad e

through convenient RJ-11 connectors along the bottom edge of the module.

408E (KSU II Component)

The 408E is very similar to the 408M; however, it is unique to KSU2. The 408E provides interface for up to 4
loop-start CO lines and 8 digital exten sion ports. In addition, the 408E regulates the 24-volt DC power from the
source to produce all required logic volt ages and oper ations volt ages. There is also a power failure port located on
the 408E that is associated to the first CO line circuit. Whenever power fails this port becomes active with dial tone
from the CO line connected to the first CO line port.

KSU2

• The 408E is equipped with a heartbeat L ED that indicate s processing activity on th e PCB; the 408E periphera l

processor is operating when the heartbeat LED is flashing. The KSU2 operation LED (located next to the
power switch) is tied to the 408E heartbeat LED, therefore, when the LED next to the power switch is
flashing, the 408E is active.

• The KSU2-408E connections are almost identical to those on the 408M (KSU1); the exception is the long

shielded cable used to connect KSU2 to the CPM inside of KSU1.

NOTE

There is no standard APM4 installed inside of KSU2. However, one can be
connected using the dedicated cable.

408E - KSU2 Component (continued on next page)

- 19 -

OVERVIEW DX-120 Installation and Maintenance Manual

408E - KSU2 Component (continued)

• Each CO line circuit incorporates over-voltage protection, ring detector, loop detector, loop/pulse-dial relay,

current sink circuit, coupling/isolation transformer (impedance 600:600), hybrid circuit, CODEC & filter,
polarity guard circuit and Radio Frequency noise filter.

• The fourth CO line port is equipped with CNG Fax Tone Detection circuitry. When programmed as a “FAX”

line, this circuit automatically engages the FAX tone detector. If FAX tone is detected, the system routes the
call to the analog port designated as the destination for fax calls.

• Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a proprietary

octal ASIC (Application Specific Integrated Circuit) transceiver. There are three data ch annels in operation at
each extension port via the octal transceiver: one channel is used for call processing control of digital
terminal functions/operations and two channels are used for the digital voice channel requirements.

• Each digital station interface is protected against circuit wiring shorts by an over-curre nt protection Polyswitch.

The digital station circuit requires only on e cable pair to operate and is not polarity sensitive.

• Physical connection of digital extension terminals, power failure telephones, and CO lines to the 408M

module is made through convenient RJ-11 connectors along the bottom edge of the module.

APM4 (Analog Port Module - 4 Circuits)

The APM4 provides four separate analog device ports. This allows the DX-120 to support auxiliary office
equipment such as fax machines, PC/FAX modems, and analog telephones (single line telephones). The APM4
generates -30VDC and 20-25Hz, 50V square wave ringing for operation.

APM4 (Analog Port Module - 4 Circuits)

• The APM4 is equipped with a heartbeat LED that indicates processing activity on the PCB; the APM4

peripheral processor is operating when the heartbeat LED is flashing.

• The APM4 provides DTMF receivers for each analog port. Ancillary analog devices connected to APM4

analog ports must generate DTMF signaling.

IMPORTANT

Pulse (rotary-dial) telephones/equipment are not supported.

APM4 - Analog Port Module (continued on next page)

- 20 -

DX-120 Installation and Maintenance Manual OVERVIEW

APM4 - Analog Port Module (continued)

• All connections are via RJ-11 connectors along the bottom edge of the module. KSU1 is delivered with one

APM4 installed on ribbon connector J5 as standard equipment.

• APM4’s may be installed on 408M/E-J5 (standard in KSU1:408M-J5 or KSU2 via dedicated cable).

IMPORTANT

DO NOT A TTEMPT to install an APM4 on J2 or J3.

DPM8 (Digital Port Module - 8 Circuits)

The DPM8 module expands the DX-120 system capacity of digital ports DET (Digital Executive Telephones) and
DSS consoles. Each digital port is comprised of a proprietary octal ASIC transceiver. There are three data
channels in operation at each digital port via the octal transceiver. One channel is used for call processi ng control
of digital terminal functions/operations and two channels are used for the digital voice channel requirements. The
DPM8 is controlled directly from the 408M/E; therefore, there is no heartbeat LED located on the DPM8.

DPM8 (Digital Port Module - 8 Port)

• Each digital station interface is protected against circuit wiring shorts by an over-curre nt protection Polyswitch.

The digital station circuit requires only on e cable pair to operate and is not polarity sensitive.

• Physical connection of digital port terminals (DET and DSS) to the DPM8 module is made through convenient

RJ-11 connectors along the bottom edge of the module.

- 21 -

OVERVIEW DX-120 Installation and Maintenance Manual

DPM16 (Digital Port Module - 16 Circuits)

The DPM16 module expands the DX-120 system capacity of digital ports DET (Digital Executive Telephones) and
DSS consoles. Each digital port is comprised of a proprietary octal ASIC transceiver. There are three data
channels in operation at each digital port via the octal transceiver. One channel is used for call processi ng control
of digital terminal functions/operations and two channels are used for the digital voice channel requirements. The
DPM16 is controlled directly from the 408M/E. Therefore, there is no heartbeat LED located on the DPM16.

DPM16 (Digital Port Module - 16 Port)

• Each digital station interface is protected against circuit wiring shorts by an over-curre nt protection Polyswitch.

The digital station circuit requires only on e cable pair to operate and is not polarity sensitive.

• Physical connection of digital port terminals (DET and DSS) to the DPM16 module is made through

convenient RJ-12 connectors along the bottom edge of the module.

- 22 -

DX-120 Installation and Maintenance Manual OVERVIEW

COM4 (Central Office Module - 4 Circuits)

The COM4 module is installed in the dedicated positio n via J1 of the 408M/E. The COM 4 interfaces four loop-st art
CO lines. Since one COM4 may be installed in KSU1 and one COM4 may be installed in KSU2, you can expand
the DX-120 system loop start CO line capacity to support up to 16 loop start CO lines.

CO line Ports
1-4 (Circuit 4
Equipped
with CNG
FAX Detect)

Power Failure Transfer Port—

associated to CO Line Port 1

COM4 (Central Office Module - 4 Port)

• The COM4 module is shipped with four mounting stand-offs used to install the board into the KSU1 or KSU2.

Five RJ1 1 jacks are provided a long the bottom e dge of the COM4 module for connection of one power failu re
telephone and the four CO lines.

• CO lines are terminated at the site by the telephone company at a point of interface called the Demarcation

(Demarc). When ordering CO lines for the site, request termination on RJ11 type jacks. Doing so allows you
to easily extend the CO lines to the COM4 RJ11 connector (one CO line per jack and connector).

• Each CO line circuit incorporates over-voltage protection, ring detector, loop detector, loop/pulse-dial relay,

current sink circuit, coupling/isolation transformer (impedance 600:600), hybrid circuit, CODEC & filter,
polarity guard circuit, and Radio Frequency noise filter.

• The fourth CO line port is equipped with CNG Fax Tone Detection circuitry. When programmed as a “FAX”

line, this circuit will automatically engage the FAX tone detector. If FAX tone is detected, the system routes
the call to the analog port designated as the destination for fax calls.

- 23 -

OVERVIEW DX-120 Installation and Maintenance Manual

MDM (Modem Module)

The 7249 Modem Module is a self-contained in tegr ated mod em u nit that is installed at J5 and J6 in the upper right
corner of the CPM. The integrated MDM allows you to access the system programming and remote maintenance
utilities from an off-site location (password verification is required).

MDM (Modem Module)

• When the MDM is installed, you can program the system remotely using PC-DBA.

NOTE

PC-DBA is included in the utilities CD shipped with every new system. Or, you
can obtain PC-DBA at the Vertical web site, www.vertical.com.

• You can service the system, using PC-DBA and a modem in your PC, to place a call to the site where the DX-

120 is installed.

NOTE

If one of the voice processing systems are installed, rou tin g to th e mo d em
extension is automated. Otherwise, the person who answers this data call must
transfer the call to extension 100. Once the modems have established the data
connection, you can begin servicing the switch.

IMPORTANT

The MDM default extension number is 100. This number can be changed and
therefore may be different for some DX-120 sys tem s.

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