Toshiba DK8, DK 16 User Manual

Digital Key Telephone Systems

DK8 & DK16

INSTALLATION AND MAINTENANCE MANUAL

TOSHIBA AMERICA INFORMATION SYSTEMS, INC.

Telecommunication Systems Division

All rights reserved. No part of this manual, covered by the copyrights hereon, may be reproduced in any form or by any means—graphic, electronic, or mechanical, including photocopying, recording, taping, or information retrieval systems—with the exception of the System Record forms, without written permission of the publisher of this material.

SERIAL NO. DK8 & DK16

DK8-MA-IN/MT-R1

4025021

TOSHIBA SYSTEM PRACTICES DIGITAL KEY TELEPHONE SYSTEMS

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

INSTALLATION

Chapter One — Introduction Section 100-816-201 Chapter Two — Site Requirements Section 100-816-202 Chapter Three — System Configuration Section 100-816-203 Chapter Four — DK8 KSU and PCB Installation Section 100-816-204 Chapter Five — DK16 KSU and PCB Installation Section 100-816-205 Chapter Six — Station Apparatus Installation Section 100-816-206 Chapter Seven — Peripheral Installation Section 100-816-207 Chapter Eight — Wiring Diagrams Section 100-816-208

INSTALLATION-INTRODUCTION SECTION 100-016-201 NOVEMBER 1992

TOSHIBA SYSTEM PRACTICES DIGITAL KEY TELEPHONE SYSTEMS

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

INSTALLATION

CHAPTER ONE

INTRODUCTION

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

TABLE OF CONTENTS

PARAGRAPH SUBJECT PAGE

1 PURPOSE.............................................................................................................. 1-1

2 ORGANIZATION .................................................................................................... 1-1

3 REFERENCE DOCUMENTATION ........................................................................ 1-1

3.10 General Description............................................................................................ 1-1

3.20 Programming ...................................................................................................... 1-1

3.30 User Guides........................................................................................................ 1-1

3.40 Fault Finding Procedures ................................................................................... 1-1

3.50 Remote Maintenance and Administration........................................................... 1-1

4 SYSTEM MNEMONICS/TERMS............................................................................ 1-1

4.10 Use of Notes, Important Notes, Cautions, and Warnings.................................... 1-5

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INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

1 PURPOSE

1.00 The purpose of this section is to provide

detailed step-by-step instructions for installing the STRATA DK8 and STRATA DK16 systems.

1.01 This chapter provides an overview of the entire installation section, and includes a list of reference documentation that supports the installed system; a list of system mnemonics is also provided.

2 ORGANIZATION

2.00 This manual is organized in modular chap-

ters for easy removal and replacement of updated materials. The chapters are as follows:

Chapter One - Introduction Chapter Two - Site Requirements Chapter Three - System Configuration Chapter Four - STRATA DK8 KSU and PCB

Installation

Chapter Five - STRATA DK16 KSU and PCB

Installation Chapter Six - Station Apparatus Installation Chapter Seven - Peripherals Installation Chapter Eight - System Wiring and Main Dis-

tribution Frame Arrangements

3 REFERENCE DOCUMENTATION

telephones, standard telephones, direct station selection consoles, add-on modules and data interface units.

3.40 Fault Finding Procedures: Hardware troubleshooting and diagnostic information presented in flowchart form.

3.50 Remote Maintenance and Administration:

Programming and maintenance procedures specially adapted for remote maintenance and administration terminal use. Detailed, step-by-step instructions are provided, complete with the terminal responses.

4 SYSTEM MNEMONICS/TERMS

4.00 Mnemonics are used to identify the system’s

hardware, operation, and features. The following alphabetical listing describes the mnemonics used in this manual.

ADM: Add-on Module—A telephone upgrade that

provides 20 Direct Station Selection (DSS) buttons with busy LED indication on STRATA DK16 and 10 DSS buttons plus 8 speed dial buttons (one for every station), one night transfer and one all call page button on STRATA DK8. Can be installed on any or all 2000-series Digital Telephones in the system. Attaches to the telephone and uses the same port assigned to the telephone. ADM buttons are fixed and cannot be changed in system programming.

3.00 The STRATA DK8 and DK16 digital key systems are supported by the following complement of reference documentation:

3.10 General Description: An overview of the STRATA DK8 and DK16 systems and their features.

3.20 Programming: Detailed step-by-step instructions on how to enter data in the System Record sheets, and how to program the system from the completed System Record Sheets. LCD responses are included to provide clear guidance for the programmer.

3.30 User Guides: Detailed step-by-step guides on how to operate digital telephones, electronic

BPS: Bits Per Second—Unit of measure that re-

fers to the transmission speed (baud rate) of electronic signals. It is used when describing data interface unit and modem operation.

CO: Central Office—The facility which houses

switching equipment that provides telephone service (CO lines, Centrex lines, etc.) for the immediate geographical area.

CO Line: A term used to define the STRATA

hardware circuit that connects to the Central Office network line pair. Each CO line is assigned a CO line number in system software.

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INSTALLATION-INTRODUCTION SECTION 100-816-201 MARCH 1993

CODECs: Coder/Decoders—Semiconductors that

allow the system to process analog-to-digital and digital-to-analog conversions.

DDCB: Digital Door Phone/Lock Control Unit—A

peripheral hardware unit that can be connected to designated digital telephone circuits/ports. The DDCB has three interfaces, two of which are dedicated to door phones (MDFB), and one that can be connected to a MDFB or a door lock.

DISA: Direct Inward System Access—A feature

available for CO lines that allows an outside party to access a STRATA system’s internal stations or outgoing CO lines without going through an operator or automated attendant. An optional security code and/or account codes may be set to prevent unauthorized access to outgoing CO lines for through system calling.

DK: Digital Key.

DKSU8: Key Service Unit (STRATA DK8 only)—

The standard key service unit which includes the system's motherboard, power supply, two CO line circuits, four digital telephone circuits, relay service, and interface for Music-on-hold (MOH)/Background Music (BGM) and External Page.

DKSUB16: Base Key Service Unit (STRATA DK16

only)—The standard key service unit which includes the system's motherboard, power supply, four CO line circuits, eight digital telephone circuits, relay service, and interface for Musicon-hold (MOH)/Background Music (BGM) and External Page.

DKSUE16: Expansion Key Service Unit (STRATA

DK16 only)—The optional key service unit which has four universal slots that can support CO line, station, and external option printed circuit boards that are compatible with the larger STRATA DK systems (DK24/DK56/DK96).

There are two types of DSS consoles: the DDSS console and the HDSS console. The chief difference between them is that the DDSS console can be connected to designated digital telephone circuits, while the HDSS console can only be connected to designated electronic telephone circuits.

DTMF: Dual-tone Multi-frequency—Push-button

dialing.

DVSU: Off-hook Call Announce Upgrade—A sub-

assembly that allows a digital telephone to receive Off-hook Call Announce.

EOCU: Off-hook Call Announce Upgrade (STRATA

DK16 only)—An optional subassembly to the Electronic Telephone Interface Unit PCB (PEKU) or Standard/Electronic Telephone Interface Unit (PESU) that provides support for electronic telephones that must receive Off-hook Call Announce. Electronic telephones that must receive Off-hook Call Announce must also have an HVSU2 subassembly or the combined HVSU/ HVSI subassemblies.

FCC: Federal Communication Commission—The

telecommunication industry’s federal regulatory agency. All Toshiba hardware is FCC listed or approved.

HESB: External Speaker Box—A speaker/ampli-

fier that can be configured with the system and telephones to provide a variety of functions.

HESC-65A: A cable that connects an HHEU-

equipped digital telephone or electronic telephone to an HESB for a Loud Ringing Bell .

HHEU: Loud Ringing Bell/Headset Jack Interface

Upgrade—A small subassembly for use inside a digital telephone or a 6500-series electronic telephone that allows a speaker (HESB) and/or a headset to be installed with the station.

DSS: Direct Station Selection Console (STRATA

DK16 only)—A console designed to facilitate the processing of a heavy load of incoming calls.

HVSU2: Off-hook Call Announce Upgrade—A

subassembly that enables an electronic telephone to receive Off-hook Call Announce.

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SECTION 100-816-201

MARCH 1993

IMDU: Remote Maintenance Modem Interface

Unit (STRATA DK16 only)—A subassembly installed on a PIOU or PIOUS PCB in the optional DK16 Expansion Key Service Unit that allows the system to be connected with a remote maintenance/administration terminal.

KCDU: CO Line/Digital Telephone Interface Unit

(STRATA DK16 only)—Optional printed circuit board providing two loop start CO line circuits and four digital telephone circuits that can be installed in the Expansion Unit. The digital telephone circuits support the same devices as the PDKU except for the DDSS console.

KCOU: CO Line Interface Unit (STRATA DK16

only)—Factory-installed printed circuit board that comes standard with the Base Key Service Unit to provide four loop start CO line circuits. Available as a spare unit for field replacements.

KFCU: (STRATA DK16 only) Option feature car-

tridge that plugs into the Base Unit to provide feature upgrades to DK16.

LED: Light Emitting Diode—Status indicators lo-

cated on printed circuit boards, digital telephones, and electronic telephones.

LSI: Large Scale Integration—Related to circuit

design technology. STRATA DK8 and STRATA DK16 printed circuit boards use LSI circuit design.

MDF: Main Distribution Frame—The wiring frame

usually located in a phone closet.

MDFB: Door Phone Box—A peripheral two-way

speaker box option. Each MDFB connects to a DDCB. A DDCB can support as many as three MDFBs.

OCA: Off-hook Call Announce. PBX: Private Branch Exchange—Industry-stan-

dard term which refers to a telephone switch, usually on-premises, which serves an individual company, and is connected to a public telephone exchange through the CO.

KPSU16: (STRATA DK16 only) Power supply that

comes factory-installed in the Base Key Service Unit. This power supply provides power to the entire system, in its standard and expanded configurations. Available as a spare unit for field replacements.

K4RCU: (STRATA DK16 only) Optional unit that

can be installed in the Base Key Service Unit to provide a 4-circuit Dual-tone Multi-frequency receiver for CO lines and standard telephones. It also provides busy tone detection for Auto Busy Redial.

KSTU: Standard Telephone Interface Unit

(STRATA DK16 only)—Optional printed circuit board that can be installed in the Base Key Service Unit to provide four standard telephone circuits.

LCD: Liquid Crystal Display—Display used for

messaging, identification, and status that appears on some digital and electronic telephones.

PCB: Printed Circuit Board. PCM: Pulse Code Modulation—A widely used

form of digital telephone switching.

PCOU1: CO Line Interface Unit (STRATA DK16

only)—A printed circuit board that can be installed in the optional Expansion Key Service Unit to provide the system with four loop start CO lines circuits.

PCOU2: (STRATA DK16 only) The PCOU2 is a

direct replacement for the PCOU1. Their fit/ form/function is identical; however, for manufacturing reasons, the PCOU1 was phased out in favor of the PCOU2.

PDIU-DI/PDIU-DI2: Integrated Data Interface

Unit—Replaces the normal digital telephone base to enable the telephone to transmit and receive data between a terminal/personal computer connected to the telephone and data devices connected to other PDIU-DIs, or to modems, printers, and computers connected to

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INSTALLATION-INTRODUCTION SECTION 100-816-201 MARCH 1993

Stand-alone Data Interface Units (PDIU-DSs). The PDIU-DI is also used to provide personal computer access to outside dial-up data services and/or bulletin boards.

NOTE: The PDIU-DI and the PDIU-DI2 are identical, except that the PDIU-DI attaches to 1000series Digital Telephones, while the PDIUDI2 attaches to 2000-series Digital Telephones.

PDIU-DS : Stand-alone Data Interface Unit—Used

for modem pooling, printer sharing, and access to a host/mainframe computer.

PDKU1: Digital Telephone Interface Unit (STRATA

DK16 only)—A printed board that can be installed in the optional Expansion Key Service Unit to provide the system with eight digital telephone circuits. In addition to digital telephones, the PDKU can support data interface units (Stand-alone and Integrated), a digital DSS console (DDSS), and a digital door phone/ lock control unit (DDCB).

PDKU2: Digital Telephone Interface Unit (STRATA

DK16 only)—Provides same function as the PDKU1, except that the PDKU1 can only support data interface units on Circuits 1 ~ 7, while the PDKU2 can support data interface units on Circuits 1 ~ 8.

PEKU: Electronic Telephone Interface Unit

(STRATA DK16 only)—An optional PCB that provides the system with eight electronic telephone circuits, which can support electronic telephones, a Background Music source, an electronic DSS console (HDSS), and an amplifier for two CO line conference calls.

PESU:

Standard/Electronic Interface Unit DK16 only) standard telephone circuits and four electronic telephone circuits that can be installed in the optional Expansion Key Service Unit. The electronic telephone circuits can support the same devices as the PEKU, except for the HDSS console. The standard telephone circuits can

—A printed circuit board with two

(STRATA

support the same single-line devices as the KSTU and the PSTU.

PFT: Power Failure Transfer Interface—Dedicated

standard telephone interface located on the motherboard in the DKSUB16 (STRATA DK16) or DKSU8 (STRATA DK8) to provide emergency service during a system power failure.

PIOU: Option Interface Unit (STRATA DK16 only)—

A printed circuit board that can be installed in the optional Expansion Key Service Unit to provide support and/or circuit interface for optional hardware peripherals and upgrades.

PIOUS: (STRATA DK16 only) The same as the

PIOU, except the PIOUS has one external paging interface zone, while the PIOU has four.

NOTE: The system cannot support the PIOU and PIOUS simultaneously. Only one or the other can be installed.

PORT: There are two types of ports: physical and

logical. A physical port is an actual station circuit location; a logical port is the set of characteristics—features, station intercom number, etc.— assigned to the physical port. Logical ports are mobile. They can be moved from one physical port to another.

PBTC: A Toshiba-supplied cable used to connect

customer-supplied batteries to the power supply in the DKSUB for emergency reserve power.

PPTC: (STRATA DK16 only) A Toshiba-supplied

adapter that is used to connect the modular SMDR and/or maintenance ports to the DB-25 connector of a printer, terminal, modem or call accounting machine. The SMDR/Maintenance (TTY) port is located on the optional QSMU PCB (STRATA DK8), or PIOU or PIOUS PCB (STRATA DK16).

PSTU1: Standard Telephone Interface Unit

(STRATA DK16 only)—A printed circuit board with a built-in ring generator that can be installed in the optional Expansion Key Service Unit to

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INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

provide interface for eight standard telephones or optional hardware peripherals (voice mail devices, fax machine, Background Music source, etc).

PSTU2: Standard Telephone Interface Unit

(STRATA DK16 only)—Provides the same function as the PSTU with the addition of a switch to select high or low ringing generator voltage.

QCDU: CO Line/Digital Telephone Interface Unit

(STRATA DK8 only)—Optional printed circuit board providing one loop start CO line circuit and two digital telephone circuits that can be installed in the KSU. A maximum of two QCDUs may be installed in the DK8.

QCNU: Conference Unit (STRATA DK8 only)—

Standard factory-installed printed circuit board provides two conference circuits that can be installed in the KSU. The PCB allows two simultaneous conferences: four parties for the first, and three parties for the second simultaneous conference.

(STRATA DK8 only)—Optional printed circuit board that can be installed in the KSU to provide two standard telephone circuits.

RAM: Random Access Memory—Refers to the

type of system memory that holds individual system configuration and feature programming. RAM is read/write memory, and can be easily revised in programming.

ROM: Read Only Memory—Refers to the type of

system memory that holds static software that comprises the mechanics of the features’ functions. ROM is only revised by Toshiba software engineers.

4.10 Use of Notes, Important Notes, Cautions, and Warnings

4.11 Notes call attention to specific items to elabo-

rate, or to refer the reader to other information.

4.12 Important Notes are used when the information is considered to be very important.

QPSU: (STRATA DK8 only)—Power supply that

comes factory-installed in the KSU. This power supply provides power to the entire system. Available as a spare unit for field replacements.

QRCU: Optional printed circuit board that can be

installed in the KSU to provide a 3-circuit Dualtone Multi-frequency receiver for DISA CO lines and standard telephones. It also provides busy tone detection for Auto Busy Redial.

QSMU: SMDR/TTY Interface Unit (STRATA DK8

only)—Optional printed circuit board which provides either SMDR, or Remote Maintenance Terminal (TTY) or external modem interface. QSMU configuration is selectable in system programming.

QSTU: Standard Telephone Interface Unit

4.13 Cautions call attention to the possibility of

equipment being damaged if the instructions are not followed closely.

4.14 Warnings are used when the given tasks involved could cause the possibility of personal injury or death to the technician.

1-5

TOSHIBA SYSTEM PRACTICES DIGITAL KEY TELEPHONE

SYSTEMS

INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

INSTALLATION

CHAPTER TWO

SITE REQUIREMENTS

INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

TABLE OF CONTENTS

PARAGRAPH SUBJECT PAGE

1 GENERAL .............................................................................................................. 2-1

2 INPUT POWER REQUIREMENTS ........................................................................ 2-1

3 SITE CONSIDERATIONS ...................................................................................... 2-1

3.00 Clearance and Location Requirements .............................................................. 2-1

3.10 Electrical/Environmental Requirements and Characteristics............................... 2-2

4 GROUNDING REQUIREMENTS ........................................................................... 2-2

4.10 Third Wire Ground Test...................................................................................... 2-2

4.20 Alternate or Additional Ground ........................................................................... 2-4

TABLE LIST

TABLE TITLE PAGE

2-A SUMMARY OF ELECTRICAL/ENVIRONMENTAL CHARACTERISTICS.............. 2-3

FIGURE LIST

FIGURE TITLE PAGE

2-1 DK8 BASE KEY SERVICE UNIT AND HPFB MINIMUM CLEARANCE

REQUIREMENTS................................................................................................... 2-1

2-2 BASE KEY SERVICE UNIT MINIMUM CLEARANCE REQUIREMENTS .............. 2-1

2-3 DK16 COMBINED BASE AND EXPANSION KEY SERVICE UNIT

MINIMUM CLEARANCE REQUIREMENTS .......................................................... 2-2

2-4 KSU GROUNDING DIAGRAM............................................................................... 2-3

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INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

1 GENERAL

1.00 This chapter defines the installation site re-

quirements necessary to ensure a proper operating environment for the STRATA DK8 and DK16. Also included are grounding requirements.

2 INPUT POWER REQUIREMENTS

2.00 The system requires an input power source

of 117VAC nominal (85VAC ~ 135VAC), 50/60 Hz, 15 amps. The AC outlet is recommended to be

dedicated

ground (refer to Paragraph 4). This is to eliminate interference from branch circuit motor noise or the like, and to prevent accidental power-off.

2.01 To avoid accidental power turn-off, it is recommended that an ON/OFF wall switch used on this dedicated AC circuit.

and unswitched, with a solid third wire

not

2.02 An option Reserve Power Battery and Charger (HPFB) is available for use with the STRATA DK8 to serve as a power failure backup. For the STRATA DK16, a reserve power source (two customer-supplied 12-volt batteries) may be connected to the system to serve as a power failure backup.

3 SITE CONSIDERATIONS

3.00 Clearance and Location Requirements

3.01 The key service units must be wall mounted.

Figure 2-1 shows the minimum clearance requirements for the STRATA DK8 system, and includes the recommended mounting location and clearance requirements for the optional HPFB. Figures 2-2 (Base Key Service Unit) and 2-3 (Base and Expansion Key Service Unit together) show the minimum clearance requirements for the standard

DK8 KEY SERVICE UNIT AND HPFB CLEARANCE

FRONT VIEW

HPFB

DK 8 KSU

2" 2"10"

TOP VIEW

3 FEET

16.4"

WALL

DK16 BASE KEY SERVICE UNIT CLEARANCE

FRONT VIEW

2" 2"

TOP VIEW

12.25"

DK 16 BASE KSU

3.5"

3 FEET

18"

WALL

FIGURE 2-1 DK8 KEY SERVICE UNIT AND HPFB MINIMUM CLEARANCE REQUIREMENTS

FIGURE 2-2 DK16 BASE KEY SERVICE UNIT MINIMUM CLEARANCE REQUIREMENTS

2-1

INSTALLATION-SITE REQUIREMENTS SECTION 100-816-202 MARCH 1993

DK16 BASE AND EXPANSION

UNIT CLEARANCE

FRONT VIEW

TOP VIEW

20"

BASEEXP

3.5"

3 FEET

18"

WALL

FIGURE 2-3 DK16 COMBINED BASE AND EXPANSION KEY SERVICE UNIT MINIMUM CLEARANCE REQUIREMENTS

and optioned STRATA DK16 system. Refer to Chapter 4 for DK16 key service unit wall mounting instructions.

3.03 If reserve power is to be installed for the STRATA DK16, the batteries will require a wellventilated location close (within nine feet) to the DKSUB16 (the optional Toshiba-supplied battery cable is 9 feet in length). The STRATA DK8 reserve battery (HPFB) should be mounted directly above the DKSU8 as shown in Figure 2-1.

3.10 Electrical/Environmental Requirements and Characteristics

3.11 The electrical/environmental requirements

and characteristics for each system are provided in Table 2-A.

4 GROUNDING REQUIREMENTS

4.00 The systems require a solid earth ground for

proper operation. Failure to provide ground may lead to confusing trouble symptoms and, in extreme cases, system failure. The AC power cord contains a conductor for the "third wire ground" provided by the commercial power outlet. The third-wire ground should be the only ground necessary for the DK8/DK16; this ground must originate at the buildings main power distribution panel and have a solid connection to earth ground. (Figure 2-4)

4.10 Third Wire Ground Test

3.02 The following conditions must be considered

when selecting a location for the key service unit(s): The location MUST BE:

•

Dry and clean

•

Well ventilated

•

Well illuminated

•

Easily accessible

The location MUST NOT BE:

•

Subject to extreme heat or cold

•

Subject to corrosive fumes, dust, or other air-

borne contaminants

•

Subject to excessive vibration

•

Next to television, radio, office automation, or

high frequency equipment

4.11 Test the "third wire ground" for continuity by either measuring the resistance between the third prong terminal (earth ground) and a metal cold water pipe (maximum: 1 ohm), or by using a commercially available earth ground indicator. If neither procedure is possible, perform the following earth ground test procedure:

WARNING! Hazardous voltages that may cause death or injury are exposed during the following test. Use great care when working with AC power line voltage.

1) Obtain a suitable voltmeter, and set it for a possible reading of up to 250 VAC.

2-2

SUMMARY OF ELECTRICAL/ENVIRONMENTAL CHARACTERISTICS

GENERAL

Primary power

Input AC AC frequency Power

Environmental specifications

Operating temperature Operating humidity Storage temperature

Power supply

DC voltage output specification

Battery charger characteristics

(DK16 only)

INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

TABLE 2-A

85 ~ 135VAC 50/60 Hz DK8-46 watts maximum, DK16-75 watts maximum

32 ~ 104°F (0 ~ 40°C) 20 ~ 80% relative humidity without condensation

- 4 ~ 158°F (-20 ~ 70°C) DK16

–24VDC: (–26.3 ~ –27.8VDC) +5VDC: ( +4.5 ~ +5.5VDC) –5VDC: ( –4.5 ~ –5.5VDC)

Charger: current limiting Nominal float voltage: 2.275 volts/cell Charge current: 0.7 amps maximum Battery discharge cut-off voltage: 20.5 ± 0.5VDC

DK8 +24VDC: (+26.3 ~ +27.8VDC) +5VDC: ( +4.5 ~ +5.5VDC) Note: +5V converter on KSU PCB

MARCH 1993

QSTU, KSTU, PSTU or PESU (circuits 1 & 2)

Ring voltage

Ringing capability

GROUND 1 THIRD WIRE GROUND

TO AC POWER CORD

THIRD WIRE AC GROUND

ELECTRICAL SYSTEM GROUND

DK8 OR DK16 KSU

POWER SUPPLY

FIGURE 2-4 KSU GROUNDING DIAGRAM

Square wave output with high/low option jumper: Low position, 130 ± 20VDC peak–to–peak (no-load)

High position, 190 ± 25VDC peak–to–peak (no-load) Two ringers maximum per circuit, high or low position

2) Connect the meter probes between the two main AC voltage terminals (white and black wires) on the wall outlet. The reading obtained should be between 100 ~ 120 VAC.

3) Move one of the meter probes to the third terminal (green wire ground). Either the same reading or a reading of zero volts should be obtained.

4) If the reading is zero volts, leave one probe on the ground terminal and move the other probe to the second voltage terminal.

CAUTION! If a reading of zero volts is obtained on both voltage terminals (white wire to green wire, black wire to green wire), the outlet is not properly grounded. Omit steps 5 and 6, and proceed directly to step 7.

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INSTALLATION-SITE REQUIREMENTS SECTION 100-816-202 MARCH 1993

5) If a reading of zero volts on one terminal, and a reading of 100 ~ 120 VAC on the other terminal is obtained, remove both probes from the outlet.

6) Set the meter to the “OHMS/Rx1” scale. Place one probe on the ground terminal, and the other probe on the terminal that produced a reading of zero volts. The reading should be less than 1 ohm.

CAUTION! If the reading is more than one ohm, then the outlet is not adequately grounded.

7) If the above tests show the outlet is not properly grounded, the condition should be corrected (per Article 250 of the National Electrical Code) by a qualified electrician before the system is connected.

4.20 Alternate or Additional Ground

4.21 If the “third wire” AC ground can not practi-

cally be improved or if extreme motor noise or other disturbance causes system malfunction, or if local area lightning storms exist, a separate direct ground may be warranted.

4.22 Connect a separate earth ground from a cold water pipe or earth grounding rod directly to the FG screw terminal on the DK8/DK16 power supply. See Figure 4-5 of Section 100-816-204 (for STRATA DK8) or Figure 5-8 of Section 100-816- 205 (for STRATA DK16).

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TOSHIBA SYSTEM PRACTICES DIGITAL KEY TELEPHONE SYSTEMS

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

INSTALLATION

CHAPTER THREE

SYSTEM CONFIGURATION

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

TABLE OF CONTENTS

PARAGRAPH SUBJECT PAGE

1 INTRODUCTION ...................................................................................................... 3-1

2 SYSTEM CAPACITY................................................................................................ 3-1

2.00 Total System Capacity.......................................................................................... 3-1

2.10 The DK8 Key Service Unit.................................................................................... 3-1

2.20 The DK16 Base Key Service Unit......................................................................... 3-1

2.30 The DK16 Expansion Key Service Unit................................................................ 3-1

3 STATION CONSIDERATIONS ................................................................................ 3-5

3.10 Telephone Circuit (Port) Types............................................................................. 3-5

3.20 Digital Telephone Circuit Connections ................................................................. 3-5

3.30 Electronic Telephone Circuit Connections (STRATA DK16 Only) ........................ 3-8

3.40 Standard Telephone Circuit Options .................................................................... 3-8

4 TELEPHONE UPGRADES ...................................................................................... 3-9

4.10 Digital Telephone Upgrades................................................................................. 3-9

4.20 Electronic Telephone Upgrades ........................................................................... 3-9

5 CONFIGURATION EXAMPLES............................................................................... 3-9

5.10 Strata DK8 - Example 1 (Small Retail Store)........................................................ 3-9

5.20 Strata DK8 - Example 2 (Home Office) ................................................................ 3-9

5.40 Strata DK16 - Example 1 (Bank) .......................................................................... 3-10

5.50 Strata DK16 - Example 2 (Office/Warehouse)...................................................... 3-10

6 CONFIGURATION WORKSHEET ........................................................................... 3-10

TABLE LIST

TABLE TITLE PAGE

3-A DK8 CO LINE/STATION CONFIGURATION GUIDE............................................... 3-2

3-B DK16 CO LINE/STATION CONFIGURATION GUIDE (BASE AND

EXPANSION UNIT).................................................................................................. 3-2

3-C DK8 KEY SERVICE UNIT COMPONENTS ............................................................. 3-3

3-D DK16 BASE KEY SERVICE UNIT COMPONENTS................................................. 3-4

3-E DK16 EXPANSION KEY SERVICE UNIT PCBs ...................................................... 3-5

3-F INTERFACE OPTION .............................................................................................. 3-6

3-G STRATA DK8 STATION APPARATUS OVERVIEW ............................................... 3-6

3-H STRATA DK16 STATION APPARATUS OVERVIEW ............................................. 3-7

WORKSHEETS

NUMBER TITLE PAGE

1 DK8 STATION AND CO LINE TOTALS................................................................... 3-11

2 DK8 KEY SERVICE UNIT AND PCBs ..................................................................... 3-12

3 DK8 PERIPHERALS AND UPGRADES .................................................................. 3-13

1 DK16 STATION AND CO LINE TOTALS................................................................. 3-15

2 DK16 KEY SERVICE UNIT AND PCBs ................................................................... 3-16

3 DK16 PERIPHERALS AND UPGRADES ................................................................ 3-17

4 DK16 SYSTEM POWER CHECK ............................................................................ 3-19

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INSTALLATION-CONFIGURATION SECTION 100-816-203 MARCH 1993

3-ii

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

1 INTRODUCTION

1.00 This chapter offers guidelines and consider-

ations on how to configure a STRATA DK8/DK16 system, which can support a wide variety of stations and peripherals.

2 SYSTEM CAPACITY

2.00 Total System Capacity

2.01 The STRATA DK8/DK16 systems have a

modular design which allows them to support a number of station and CO line configurations. The main component of each system is the Key Service Unit. The DK8 KSU can have up to 10 stations and four CO lines. The DK16 Base Key Service Unit can have up to 12 stations and four CO lines. An Expansion Key Service Unit can be added to the DK16 to increase the station capacity to 20 and the CO line capacity to eight. Station and CO line configurations are shown in Table 3-A (for DK8) and Table 3-B (for DK16).

2.10 The DK8 Key Service Unit

2.11 Station and CO Lines. The DK8 Key Service

Unit comes standard with four digital telephone circuits (ports) and two CO line circuits (Table 3-C). An optional printed circuit board called the QCDU can be added to the KSU to provide one CO line circuit and two digital telephone circuits. A maximum of two QCDUs may be added to provide a total of four additional digital telephone circuits and two additional CO line circuits. Another optional printed circuit board called the QSTU can be added to the DK8 KSU to provide two standard telephone circuits.

2.12 Peripherals. The DK8 Key Service Unit can support a number of peripherals, which are not considered as stations and do not affect the maximum station and CO line capacities. A customersupplied Music-on-hold source, optional reserve power battery and charger, a customer-supplied emergency standard telephone for system power failure occurrences and an amplifier with speaker for paging and night ringing can all be connected to the Key Service Unit (Table 3-C). A relay contact is also provided to control one of the following

peripherals: Music-on-hold source, night bell, or page amplifier mute control.

2.20 The DK16 Base Key Service Unit

2.21 Station and CO Lines. The DK16 Base Key

Service Unit comes standard with eight digital telephone circuits (ports) and four CO line circuits (Table 3-D). An optional printed circuit board called the KSTU can be added to the unit to provide four standard telephone circuits (ports).

2.22 Peripherals. The DK16 Base Key Service Unit can support a number of peripherals, which are not considered as stations and do not affect the maximum station and CO line capacities. A customer-supplied Music-on-hold source, customer-supplied separate background music source, customer-supplied reserve power batteries, a customer-supplied emergency standard telephone for system power failure occurrences and an amplifier with speaker for paging and night ringing can all be connected to the Base Key Service Unit (Table 3-D). A relay contact is also provided to control one of the following peripherals: Music-on-hold source, night bell, or Page Amplifier mute control.

2.30 The DK16 Expansion Key Service Unit

2.31 Station and CO Lines. The optional DK16

Expansion Key Service Unit has four universal slots which can support a maximum of four CO lines and eight stations. Printed circuit boards (PCBs) that support CO lines and can be installed in the Expansion Unit are the PCOU and KCDU (Table 3-E). PCBs that can support stations and be installed in the Expansion Unit are the PDKU, PEKU, PSTU, PESU, and KCDU.

2.32 Peripherals. The Expansion Unit can support either a PIOU or PIOUS PCB, which both provide, among other features, Station Message Detail Recording (SMDR), an interface for a local programming terminal, and connectors for an internal modem (IMDU) for remote maintenance and administration (Table 3-F). Any device that connects to the PIOU or PIOUS should not be considered a station and does not affect the system's station capacity.

3-1

INSTALLATION-CONFIGURATION SECTION 100-816-203 MARCH 1993

DK8 CO LINE/STATION CONFIGURATION GUIDE

TABLE 3-A

EQUIPMENT

KSU = Key Service Unit ·2 CO Lines/4 digital circuits) QCDU = Optional PCB (1 CO line/2 digital circuits) QSTU = Optional PCB (2 standard circuits)

CONFIGURATION CO

LINES BY STATION

2 by 4 2 by 6 3 by 6 3 by 8 4 by 8 4 by 10

COs DKTs SLTs EQUIPMENT

2 2 3 3 4 4

4 4 6 6 8 8

2 2 2

CO = Central Office DKT = Digital Telephone SLT = Standard Telephone

KSU KSU + QSTU KSU + QCDU KSU + QCDU + QSTU KSU + QCDU + QCDU KSU + QCDU + QCDU + QSTU

TABLE 3-B

DK16 CO LINE/STATION CONFIGURATION GUIDE (BASE AND EXPANSION UNIT)

EQUIPMENT

BU KSTU EU PDKU KCDU PEKU PESU

Base Unit (4 CO lines/8 digital circuits)

Base Unit Option (4 standard circuits)

Expansion Unit

EU option (8 digital circuits)

EU option (2 CO lines/4 digital circuits)

EU option (8 electronic circuits)

EU option (2 standard/4 electronic circuits)

PSTU PCOU CO DKT EKT SLT

EU option (8 standard circuits)

EU option (4 CO lines)

Central Office line

Digital telephone

Electronic telephone

Standard telephone

CONFIGURATION CO

LINES BY STATION

4 by 8 4 by 12 4 by 14 4 by 16 4 by 16 4 by 16 4 by 18 4 by 20 4 by 20 4 by 20 6 by 12 6 by 16 8 by 8 8 by 12 8 by 14 8 by 16 8 by 16 8 by 16 8 by 18 8 by 20 8 by 20 8 by 20 8 by 20

COs DKTs EKTs SLTs EQUIPMENT

4 4 4 4 4 4 4 4 4 4 6 6 8 8 8 8 8 8 8 8 8 8 8

16 12

16 16

8 8 8 8 8

8 8

8 8 8 8

8 8 8

4 8 4

4 8

4 2 8

6 4 4

4 4

6 4 4 4

BU BU + KSTU BU + EU + PESU BU + EU + PSTU BU + EU + PEKU BU + EU + PDKU BU + KSTU + PESU BU + KSTU + EU + PEKU BU + KSTU + EU + PDKU BU + KSTU + EU + PSTU BU + EU + KCDU BU + KSTU + EU + KCDU BU + EU + PCOU BU + KSTU + EU + PCOU BU + EU + PCOU + PESU BU + EU + PCOU + PEKU BU + EU + PDKU + PCOU BU + EU + KCDU + KCDU BU + KSTU + EU + PCOU + PESU BU + KSTU + EU + KCDU + KCDU BU + KSTU + EU + PCOU + PEKU BU + KSTU + EU + PCOU + PDKU BU + KSTU + EU + PCOU + PSTU

3-2

Item Connector TypeSupports Standard Optional

Digital Telephone Circuits (4)

CO Line Circuits (2) Power Failure Transfer Interface

Battery Backup Interface

Music-On-Hold/BGM Interface

600 Ohm page Interface CO line CKT (1)/

Digital Telephone CKT (2) (QCDU) (max. 2 QCDU per system)

Standard Telephone Interface Unit (QSTU)

•

2 standard telephone circuits

•

(1 max.) QSTU per system

DTMF/ABR Tone Receiver (3-Receiver CKT per QRCU )

Control Relay

Conference Circuit Interface Unit (QCNU)

SMDR/TTY Interface Unit (QSMU) (Requires PPTC)

TABLE 3-C

DK8 KEY SERVICE UNIT COMPONENTS

•

Digital Telephones (with or without PDIU–DI2 or ADM)

•

Stand-alone Data Interface Units (PDIU-DS)

•

Door Phone Lock/Control Unit (DDCB)

•

Loop Start CO Lines

•

Standard Telephone (one)*

•

Optional HPFB Battery (one or two per system)

•

Music-on-hold/BGM Source*

•

Amplifier/Speaker

•

Digital Telephones (with or without PDIU–DI2 or ADM)

•

Stand-alone Data Interface Units (PDIU-DS)

•

Loop Start CO Line

•

Standard Telephones*

•

Other Single-line Devices*

•

Fax Machine*

•

Voice Mail Devices

•

Alternate BGM source*

•

Automatic Busy Redial

•

Standard telephone ports

•

DISA

One of the following:

•

Night Relay

•

External Page Mute

•

MOH Control Relay

•

2 Simultaneous Conferences

•

SMDR Printer*, or

•

Maintenance Terminal* or

•

Modem*

25-pair Amphenol

RJ11 Modular RJ11 Modular

Proprietary Cable/Connector

RCA Jack

RCA Jack 25-pair Amphenol

RJ11 Modular

25-pair Amphenol

Internal

25-pair Amphenol

Internal

6-pin Modular (PPTC adaptor)

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

✓

✓ ✓

Interface

HPFB

with cable

✓ ✓

✓

Customer supplied equipment not offered by Toshiba Telecommunication Systems Division.

3-3

INSTALLATION-CONFIGURATION SECTION 100-816-203 MARCH 1993

TABLE 3-D

DK16 BASE KEY SERVICE UNIT COMPONENTS

Item

Digital Telephone Circuits (8)

CO Line Circuits (4) Power Failure Transfer Interface Battery Backup Interface with

built-in charger Music-On-Hold/BGM Interface 600 Ohm page Interface

Standard Telephone Interface Unit (4-Circuit) (KSTU)

Supports

Digital Telephones (with

•

or without PDIU–DI2 or ADM)

Stand-alone Data

•

Interface Units (PDIU-DS) Door Phone Lock/Control

•

Unit (DDCB) Digital Direct Station

•

Selection Console (DDSS)

Loop Start CO Lines Standard Telephone (one) Two 12-volt Batteries

Music-on-Hold/BGM source Amplifier/Speaker

Standard Telephones

•

Other Single-line Devices

•

Alternate BGM Source

•

Fax machine

•

Voice mail devices

•

Connector Type

25-pair Amphenol

RJ11 Modular RJ11 Modular

Proprietary Connector/Cable

RCA Jack

RCA Jack 25-pair Amphenol

Standard Optional

✓

✓ ✓ ✓

Cable and Batteries

✓ ✓

✓

Automatic Busy Redial

DTMF/ABR Receiver (K4RCU)

Feature Cartridge Control Relay

Customer supplied equipment not offered by Toshiba Telecommunication Systems Division.

•

Standard Telephone Ports

•

Interprets DTMF Tones

•

DISA

•

Future Feature Upgrades

•

Choice of one:

MOH Source Control

•

Night Bell Control

•

BGM Mute Control

•

Internal

Internal 25-pair Amphenol

3-4

✓

TABLE 3-E

DK16 EXPANSION KEY SERVICE UNIT PCBs

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

PCB

PDKU

PEKU

PSTU

PESU

PCOU

Circuits per PCB

8 digital telephone circuits

8 electronic telephone circuits

8 standard telephone circuits

2 standard telephone/ 4 electronic telephone circuits (standard/electronic telephone ports)

4 CO line circuits (lines)

Interfaces

• Digital telephones with or without PDIU-DI2 or ADM

• DDSS console

• PDIU-DSs

• DDCB

• Electronic telephones

• HDSS console

• BGM source

• EOCU PCB for OCA

• Standard telephones

• Voice mail ports

• Background music source

• Off-premises stations

• Other similar devices

Standard: same as PSTU Electronic: same as PEKU except PESU does not support HDSS console

• Central Office loop start

lines

Connector

25-pair amphenol

RJ14C modular

KCDU

PIOU, PIOUS

2 CO line circuits/ 4 digital telephone circuits

See Table 3-D

• Central Office loop

• DKT circuits same as

See Table 3-D

3 STATION CONSIDERATIONS

3.00 For configuration purposes, a station can be

considered as any device which is connected to a dedicated telephone circuit. Although the words "telephone" and "station" are often used synonymously and interchangeably in STRATA DK8/ DK16 documentation, devices other than telephones—such as Stand-alone Data Interface units (PDIU-DSs)—should also be considered as stations when configuring a system, because they require a dedicated telephone circuit. A station apparatus overview is shown in Table 3-G (for STRATA DK8) and Table 3-H (for STRATA DK16).

RJ14C Modular

start lines PDKU, except no DDSS

(CO Line circuits) 25-pair amphenol

(digital telephone circuits) 25-pair amphenol (PIOU)

Spring clip terminal (PIOUS)

3.10 Telephone Circuit (Port) Types

3.11 There are three types of telephone circuits to

which stations can be connected: digital telephone circuits, electronic telephone circuits, and standard telephone circuits. All three types of circuits are available with the STRATA DK16. The STRATA DK8 does not support electronic telephone circuits.

3.20 Digital Telephone Circuit Connections

3.21 The STRATA DK8 Key Service Unit provides

four digital telephone circuits. The QCDU PCB provides two.

3-5

INSTALLATION-CONFIGURATION SECTION 100-816-203 MARCH 1993

Expansion Unit Interface Options PIOU PIOUS

TABLE 3-F

PIOU/PIOUS INTERFACE OPTION (DK16 ONLY)

Zone Page Interface (unamplified, 4 zones) Night Transfer or Music-on-Hold Control Relay Door Lock or External Amplifier Control Relay Alarm Sensor SMDR output (RS-232/6-wire modular connector) Maintenance Port for a Local ASCII Terminal or

External Modem (RS-232/6-wire modular connector) Remote Maintenance Modem (IMDU subassembly, no

external connector)

NOTE: X = the option is provided

Station

Digital Telephone DKT with or without ADM or PDIUDI

Stand-alone Data Interface Unit (PDIUDS)

Digital Door Phone/Lock Control Unit (DDCB)

Single-wire pair devices:

•

Standard Telephone

•

Voice Mail Device

•

Facsimile Machine

•

Modem

•

Dictation Equipment

Alternate Background Music

Source

TABLE 3-G

STRATA DK8 STATION APPARATUS OVERVIEW

Type and Number of Circuits Required

Digital, one for each DKT

Digital, one for each PDIU-DS

Digital, one for each DDCB

Standard, one for each device (voice mail devices may require more than one circuit)

Standard port for the source

PCB or Interface

KSU (Circuits 1 ~ 4) QCDU (Circuits 1 ~ 2)

KSU (Circiuts 1 ~ 4) QCDU (Circuits 1 ~ 2)

KSU Port 02

Port 03

QSTU (Circuits 1 ~ 2)

QSTU (Circuit 2)

Port 19

X X X X X X

KSU Capacity

—

X X X X X

KSU and Optional PCB Combined Capacity

May require interface transformer, see Section 100-816-207.

3-6

INSTALLATION-CONFIGURATION

TABLE 3-H

STRATA DK16 STATION APPARATUS OVERVIEW

SECTION 100-816-203

MARCH 1993

Station

Digital Telephone (DKT with or without ADM or PDIU-DI)

Stand-alone Data Interface Unit (PDIU-DS)

Digital Direct Station Selection Console (DDSS)

Digital Door Phone/Lock Control Unit (DDCB)

Electronic Telephone (EKT)

Electronic Direct Station Selection Console (HDSS)

Conference Amplifier

Single-wire-pair Devices:

• Standard Telephone

• Voice Mail Device

• Facsimile Machine

• Modem

• Dictation Equipment Alternate

Background Music Source

Type and Number of

Circuits Required

Digital, one for each DKT

Digital, one for each PDIU-DS

Digital, one for each DDSS

Digital, one for each DDCB

Electronic, one for each EKT

Electronic, two for the HDSS

Electronic, two for the amplifier

Standard, one for each device (voice mail devices may require more than one circuit)

Standard or Electronic, one for the source

PCB or Interface

Base Unit (Circuits 1~8) PDKU2 (Circuits 1~8) KCDU (Circuits 1~4)

Base Unit (Circuit 8) PDKU (Circuit 8)

Base Unit (Circuit 5) PDKU (Circuit 1) or first KCDU (Circuit 1)

PEKU (Circuits 1~8) PESU (Circuit 5~8)

PEKU (Circuits 7 and 8)

PEKU (Circuits 6 and 7) PESU (Circuits 6 and 7)

KSTU (Circuits 1~4) PSTU (Circuits 1~8) PESU (Circuits 1~2)

KSTU (Circuit 4) PEKU (Circuit 3) PESU (Circuit 8) PSTU (Circuit 4)

Base Unit

Capacity

Base and Expansion

Unit Combined Capacity

May require interface transformer, see Section 100-816-207.

3-7

INSTALLATION-CONFIGURATION SECTION 100-816-203 MARCH 1993

NOTE: A maximum of two QCDU PCBs may be installed in the STRATA DK8.

3.22 The STRATA DK16 Base Key Service Unit and the PDKU PCB each provide eight digital telephone circuits. The KCDU PCB provides four.

NOTE: A maximum of two KCDU PCBs may be installed in the STRATA DK16. If a KCDU is installed, no other type of station PCB can be installed in the STRATA DK16.

3.23 The following devices can be connected to digital telephone circuits:

•

Digital Telephones (2000- and 1000-series):

Each digital telephone requires one circuit, and each digital telephone circuit can support a digital telephone.

•

Stand-alone Data Interface Units (PDIU-DS): Each PDIU-DS requires one circuit. Any digital telephone circuit, except for Circuit 8 on a PDKU1 (STRATA DK16), can support a PDIU-DS (see Note 1).

NOTES:

1. There are two versions of the PDKU: PDKU1 and PDKU2. The versions are identical, except that Circuits 1 ~ 8 on the PDKU2 can each support PDIU-DSs/ PDIU-DI, while only Circuits 1 ~ 7 on a PDKU1 can support PDIU-DSs or PDIUDIs. Also, PDIU1 does not support 2000series digital telephone continuous DTMF tones.

2. The Integrated Data Interface Unit (PDIUDI/PDIU-DI2) and the Add-on Module (ADM) do not require a dedicated circuit. They share a circuit with the telephone.

3. Only one option (PDIU-DI2 or ADM) can be installed on a 2000-series digital telephone.

• Digital Direct Station Selection Console (DDSS): (available with STRATA DK16 only) Each DDSS Console requires one circuit. DDSS Consoles can connect only to Circuit 8 in the Base Key Service Unit and Circuit 8 on a PDKU.

The KCDU cannot support a DDSS console.

• Digital Door Phone/Lock Control Box (DDCB): Each DDCB requires one circuit. DDCBs can only connect to Circuits 3 and 4 (Ports 02 and 03) in the STRATA DK8 Key Service Unit or Circuit 5 (Port 04) in the STRATA DK16 Base Key Service Unit, and Circuit 1 (Port

12) on either the PDKU or KCDU (STRATA DK16).

3.30 Electronic Telephone Circuit Connec-

tions (STRATA DK16 Only)

3.31 There are no electronic telephone circuits in

the Base Key Service Unit, and none can be added to it. However, either the PEKU PCB, which has eight electronic telephone circuits, or the PESU, which has four electronic telephone circuits, can be installed in the Expansion Key Service Unit. The following devices can be connected to electronic telephone circuits.

•

Electronic Telephones (6500-, 6000-, 3000-, 2000-series): An electronic telephone can be

connected to any electronic telephone circuit. One electronic telephone circuit is required per electronic telephone.

• Electronic Direct Station Selection Console (HDSS): The system will support only one HDSS console. The console must be connected to both Circuits 7 and 8 on the PEKU. The PESU will not support an HDSS Console.

• Alternate Background Music Source: The system will support an alternate Background Music source which can be heard over digital and electronic telephone speakers and external page speakers. This source can be connected to either Circuit 3 on a PEKU, Circuit 8 on a PESU, or Circuit 4 on a KSTU or PSTU PCB.

• Conference Amplifier: An amplifier for two CO line conferencing can be connected to Circuits 6 and 7 (Ports 17 and 18) on a PEKU or PESU.

3.40 Standard Telephone Circuit Options

3.41 In addition to supporting standard telephones,

each of the standard telephone circuits can support any one of a number of single-wire-pair devices, including voice mail/Auto Attendant devices and modems. The QSTU, which can be installed in the STRATA DK8 Key Service Unit, has two

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