Toshiba DK8, DK 16 User Manual

Digital Key Telephone Systems

DK8 & DK16

INSTALLATION AND MAINTENANCE MANUAL

© COPYRIGHT 1993

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	INSTALLATION-INTRODUCTION
DIGITAL KEY TELEPHONE SYSTEMS	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	INSTALLATION-INTRODUCTION
DIGITAL KEY TELEPHONE SYSTEMS	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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1PURPOSE

1.00The 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.

2ORGANIZATION

2.00This manual is organized in modular chapters 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

3REFERENCE DOCUMENTATION

3.00The 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

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

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.

4SYSTEM MNEMONICS/TERMS

4.00Mnemonics 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.

BPS: Bits Per Second—Unit of measure that refers 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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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 Music- on-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).

DSS: Direct Station Selection Console (STRATA DK16 only)—A console designed to facilitate the processing of a heavy load of incoming calls.

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

HESC-65A: A cable that connects an HHEUequipped 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.

HVSU2: Off-hook Call Announce Upgrade—A subassembly that enables an electronic telephone to receive Off-hook Call Announce.

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

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.

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

LED: Light Emitting Diode—Status indicators located 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.

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(STRATA DK16 only)—A printed circuit board with two 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

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 characteris- tics—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

1-4

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.

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

INSTALLATION-INTRODUCTION

SECTION 100-816-201

MARCH 1993

(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.

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

4.11Notes call attention to specific items to elaborate, or to refer the reader to other information.

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

4.13Cautions call attention to the possibility of equipment being damaged if the instructions are not followed closely.

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

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TOSHIBA SYSTEM PRACTICES	INSTALLATION-SITE REQUIREMENTS
DIGITAL KEY TELEPHONE SYSTEMS	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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1GENERAL

1.00This chapter defines the installation site requirements necessary to ensure a proper operating environment for the STRATA DK8 and DK16. Also included are grounding requirements.

2INPUT POWER REQUIREMENTS

2.00The system requires an input power source of 117VAC nominal (85VAC ~ 135VAC), 50/60 Hz, 15 amps. The AC outlet is recommended to be dedicated and unswitched, with a solid third wire 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 not be used on this dedicated AC circuit.

INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

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.

3SITE CONSIDERATIONS

3.00Clearance 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

DK16 BASE KEY SERVICE UNIT CLEARANCE

AND HPFB CLEARANCE

FRONT VIEW

FRONT VIEW

2"

HPFB

12.25"

2"

2"

2"

2"

DK 8 KSU

DK 16

BASE KSU

16.4"

18"

2"

10"

2"

2"

2"

TOP VIEW

TOP VIEW

3"

WALL

3.5"

WALL

3 FEET

3 FEET

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

2" 20" 2" 2"

EXP	BASE
		18"

2"

TOP VIEW

EXP	BASE	3.5"
		WALL

3 FEET

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.

3.02 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 airborne contaminants

•Subject to excessive vibration

•Next to television, radio, office automation, or

high frequency equipment

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.

3.10Electrical/Environmental Requirements and Characteristics

3.11The electrical/environmental requirements and characteristics for each system are provided in Table 2-A.

4GROUNDING REQUIREMENTS

4.00The 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)

4.10Third Wire Ground Test

4.11Test 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.

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INSTALLATION-SITE REQUIREMENTS

SECTION 100-816-202

MARCH 1993

TABLE 2-A

SUMMARY OF ELECTRICAL/ENVIRONMENTAL CHARACTERISTICS

GENERAL

Primary power
Input AC	85 ~ 135VAC
AC frequency	50/60 Hz
Power	DK8-46 watts maximum, DK16-75 watts maximum
Environmental specifications
Operating temperature	32 ~ 104°F (0 ~ 40°C)
Operating humidity	20 ~ 80% relative humidity without condensation
Storage temperature	- 4 ~ 158°F (-20 ~ 70°C)
Power supply	DK16				DK8
DC voltage output					+24VDC: (+26.3 ~ +27.8VDC)
	–24VDC: (–26.3 ~ –27.8VDC)
specification	+5VDC: ( +4.5 ~			+5.5VDC)	+5VDC: ( +4.5 ~ +5.5VDC)
	–5VDC: ( –4.5 ~			–5.5VDC)	Note: +5V converter
					on KSU PCB
Battery charger characteristics	Charger: current limiting
(DK16 only)	Nominal float voltage: 2.275 volts/cell
	Charge current: 0.7 amps maximum
	Battery discharge cut-off voltage: 20.5 ± 0.5VDC
QSTU, KSTU, PSTU or PESU (circuits 1 & 2)	Square wave output with high/low option jumper:
Ring voltage	Low position, 130 ± 20VDC peak–to–peak (no-load)
	High position, 190 ± 25VDC peak–to–peak (no-load)
Ringing capability	Two ringers maximum per circuit, high or low position

			2) Connect the meter probes between the two
	GROUND 1 THIRD WIRE GROUND		main AC voltage terminals (white and black
			wires) on the wall outlet. The reading obtained
		TO AC POWER CORD	should be between 100 ~ 120 VAC.
	THIRD WIRE
		DK8 OR DK16 KSU	3) Move one of the meter probes to the third
	AC GROUND
		POWER	terminal (green wire ground). Either the same
			reading or a reading of zero volts should be
		SUPPLY	obtained.
	A
	ELECTRICAL		4) If the reading is zero volts, leave one probe on
	SYSTEM GROUND
			the ground terminal and move the other probe
			to the second voltage terminal.
		FG	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
	FIGURE 2-4		not properly grounded. Omit steps 5 and
			6, and proceed directly to step 7.
	KSU GROUNDING DIAGRAM

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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.

4.20Alternate or Additional Ground

4.21If the “third wire” AC ground can not practically 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.

4.22Connect 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	INSTALLATION-CONFIGURATION
	DIGITAL KEY TELEPHONE SYSTEMS	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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1INTRODUCTION

1.00This chapter offers guidelines and considerations on how to configure a STRATA DK8/DK16 system, which can support a wide variety of stations and peripherals.

2SYSTEM CAPACITY

2.00Total 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).

2.10The DK8 Key Service Unit

2.11Station 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.

2.12Peripherals. 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

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

2.20The DK16 Base Key Service Unit

2.21Station 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).

2.22Peripherals. 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, cus- tomer-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.

2.30The DK16 Expansion Key Service Unit

2.31Station 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.

2.32Peripherals. 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.

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TABLE 3-A

DK8 CO LINE/STATION CONFIGURATION GUIDE

EQUIPMENT

KSU		=	Key Service Unit ·2 CO Lines/4 digital circuits) CO					=	Central Office
QCDU =			Optional PCB (1 CO line/2 digital circuits)				DKT	=	Digital Telephone
QSTU		=	Optional PCB (2 standard circuits)				SLT	=	Standard Telephone
	CONFIGURATION CO			COs	DKTs	SLTs		EQUIPMENT
	LINES BY STATION
			2 by 4	2	4		KSU
			2 by 6	2	4	2	KSU + QSTU
			3 by 6	3	6		KSU + QCDU
			3 by 8	3	6	2	KSU + QCDU + QSTU
			4 by 8	4	8		KSU + QCDU + QCDU
			4 by 10	4	8	2	KSU + QCDU + QCDU + QSTU

TABLE 3-B

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

EQUIPMENT

BU	=	Base Unit (4 CO lines/8 digital circuits)				PSTU =			EU option (8 standard circuits)
KSTU	=	Base Unit Option (4 standard circuits)				PCOU =			EU option (4 CO lines)
EU	=	Expansion Unit				CO	=		Central Office line
PDKU =		EU option (8 digital circuits)				DKT	=		Digital telephone
KCDU =		EU option (2 CO lines/4 digital circuits)				EKT	=		Electronic telephone
PEKU =		EU option (8 electronic circuits)				SLT	=		Standard telephone
PESU =		EU option (2 standard/4 electronic circuits)
CONFIGURATION CO			COs	DKTs	EKTs	SLTs			EQUIPMENT
LINES BY STATION
4 by 8			4	8					BU
4 by 12			4	8		4			BU + KSTU
4 by 14			4	8	4	2			BU + EU + PESU
4 by 16			4	8		8			BU + EU + PSTU
4 by 16			4	8	8				BU + EU + PEKU
4 by 16			4	16					BU + EU + PDKU
4 by 18			4	8	4	6			BU + KSTU + PESU
4 by 20			4	8	8	4			BU + KSTU + EU + PEKU
4 by 20			4	16		4			BU + KSTU + EU + PDKU
4 by 20			4	8		12			BU + KSTU + EU + PSTU
6 by 12			6	12					BU + EU + KCDU
6 by 16			6	12		4			BU + KSTU + EU + KCDU
8 by 8			8	8					BU + EU + PCOU
8 by 12			8	8		4			BU + KSTU + EU + PCOU
8 by 14			8	8	4	2			BU + EU + PCOU + PESU
8 by 16			8	8	8				BU + EU + PCOU + PEKU
8 by 16			8	16					BU + EU + PDKU + PCOU
8 by 16			8	16					BU + EU + KCDU + KCDU
8 by 18			8	8	4	6			BU + KSTU + EU + PCOU + PESU
8 by 20			8	16		4			BU + KSTU + EU + KCDU + KCDU
8 by 20			8	8	8	4			BU + KSTU + EU + PCOU + PEKU
8 by 20			8	16		4			BU + KSTU + EU + PCOU + PDKU
8 by 20			8	8		12			BU + KSTU + EU + PCOU + PSTU

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TABLE 3-C

DK8 KEY SERVICE UNIT COMPONENTS

	Item		Supports	Connector Type	Standard	Optional
	Digital Telephone Circuits (4)	•	Digital Telephones (with	25-pair Amphenol
			or without PDIU–DI2 or
			ADM)
		• Stand-alone Data
			Interface Units (PDIU-DS)
		•	Door Phone Lock/Control
			Unit (DDCB)
	CO Line Circuits (2)	•	Loop Start CO Lines	RJ11 Modular
	Power Failure Transfer Interface	•	Standard Telephone	RJ11 Modular
			(one)*
	Battery Backup Interface	•	Optional HPFB Battery	Proprietary	Interface	HPFB
			(one or two per system)	Cable/Connector		with cable
	Music-On-Hold/BGM Interface	•	Music-on-hold/BGM	RCA Jack
			Source*
	600 Ohm page Interface	•	Amplifier/Speaker	RCA Jack
	CO line CKT (1)/	•	Digital Telephones (with	25-pair Amphenol
	Digital Telephone CKT (2) (QCDU)		or without PDIU–DI2 or
	(max. 2 QCDU per system)		ADM)
		• Stand-alone Data
			Interface Units (PDIU-DS)
		•	Loop Start CO Line	RJ11 Modular
	Standard Telephone	•	Standard Telephones*
	Interface Unit (QSTU)	•	Other Single-line Devices*	25-pair Amphenol
	• 2 standard telephone circuits	•	Fax Machine*
	• (1 max.) QSTU per system	•	Voice Mail Devices
		•	Alternate BGM source*
	DTMF/ABR Tone Receiver	•	Automatic Busy Redial	Internal
	(3-Receiver CKT per QRCU )	•	Standard telephone ports
		•	DISA
	Control Relay	One of the following:		25-pair Amphenol
		•	Night Relay
		•	External Page Mute
		•	MOH Control Relay
	Conference Circuit Interface Unit	•	2 Simultaneous	Internal
	(QCNU)		Conferences
	SMDR/TTY Interface Unit (QSMU)	•	SMDR Printer*, or	6-pin Modular
	(Requires PPTC)	•	Maintenance Terminal* or	(PPTC adaptor)
		•	Modem*

*Customer supplied equipment not offered by Toshiba Telecommunication Systems Division.

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TABLE 3-D

DK16 BASE KEY SERVICE UNIT COMPONENTS

Item	Supports	Connector Type	Standard	Optional
Digital Telephone Circuits (8)	Digital Telephones (with	25-pair Amphenol
	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)
CO Line Circuits (4)	Loop Start CO Lines	RJ11 Modular
Power Failure Transfer Interface	Standard Telephone (one)*	RJ11 Modular
Battery Backup Interface with	Two 12-volt Batteries*	Proprietary		Cable and
built-in charger		Connector/Cable		Batteries
Music-On-Hold/BGM Interface	Music-on-Hold/BGM source*	RCA Jack
600 Ohm page Interface	Amplifier/Speaker	RCA Jack
Standard Telephone*	Standard Telephones*	25-pair Amphenol
Interface Unit (4-Circuit)	Other Single-line Devices*
(KSTU)
	Alternate BGM Source*
	Fax machine*
	Voice mail devices
DTMF/ABR	Automatic Busy Redial	Internal
Receiver (K4RCU)	Standard Telephone Ports
	Interprets DTMF Tones
	DISA
Feature Cartridge	Future Feature Upgrades	Internal
Control Relay	Choice of one:	25-pair Amphenol
	MOH Source Control
	Night Bell Control
	BGM Mute Control

*Customer supplied equipment not offered by Toshiba Telecommunication Systems Division.

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TABLE 3-E

DK16 EXPANSION KEY SERVICE UNIT PCBs

PCB	Circuits per PCB		Interfaces	Connector
PDKU	8 digital telephone	•	Digital telephones with or	25-pair amphenol
	circuits		without PDIU-DI2 or ADM
		• DDSS console
		• PDIU-DSs
		• DDCB
PEKU	8 electronic telephone	•	Electronic telephones	25-pair amphenol
	circuits	•	HDSS console
		• BGM source
		• EOCU PCB for OCA
PSTU	8 standard telephone	•	Standard telephones	25-pair amphenol
	circuits	•	Voice mail ports
		• Background music source
		•	Off-premises stations
		•	Other similar devices
PESU	2 standard telephone/	Standard: same as PSTU		25-pair amphenol
	4 electronic telephone circuits	Electronic: same as PEKU
	(standard/electronic	except PESU does not
	telephone ports)	support HDSS console
PCOU	4 CO line circuits	•	Central Office loop start	RJ14C modular
	(lines)		lines

KCDU	2 CO line circuits/	•	Central Office loop	RJ14C Modular
	4 digital telephone circuits		start lines	(CO Line circuits)
		•	DKT circuits same as	25-pair amphenol
			PDKU, except no DDSS	(digital telephone circuits)
PIOU,	See Table 3-D	See Table 3-D		25-pair amphenol (PIOU)
PIOUS				Spring clip terminal (PIOUS)

3STATION CONSIDERATIONS

3.00For 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 tele- phones—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).

3.10Telephone Circuit (Port) Types

3.11There 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.

3.20Digital Telephone Circuit Connections

3.21The STRATA DK8 Key Service Unit provides four digital telephone circuits. The QCDU PCB provides two.

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TABLE 3-F

PIOU/PIOUS INTERFACE OPTION (DK16 ONLY)

Expansion Unit Interface Options	PIOU	PIOUS
Zone Page Interface (unamplified, 4 zones)	X
Night Transfer or Music-on-Hold Control Relay	X	X
Door Lock or External Amplifier Control Relay	X	X
Alarm Sensor	X	X
SMDR output (RS-232/6-wire modular connector)	X	X
Maintenance Port for a Local ASCII Terminal or	X	X
External Modem (RS-232/6-wire modular connector)
Remote Maintenance Modem (IMDU subassembly, no	X	X
external connector)
NOTE: X = the option is provided

TABLE 3-G

STRATA DK8 STATION APPARATUS OVERVIEW

	Type and Number of			KSU	KSU and Optional PCB
Station	Circuits Required	PCB or Interface		Capacity	Combined Capacity
Digital Telephone	Digital, one for each	KSU	(Circuits 1 ~ 4)	4	8
DKT with or without	DKT	QCDU	(Circuits 1 ~ 2)
ADM or PDIUDI
Stand-alone Data	Digital, one for each	KSU	(Circiuts 1 ~ 4)	4	8
Interface Unit (PDIU-	PDIU-DS	QCDU	(Circuits 1 ~ 2)
DS)
Digital Door	Digital, one for each	KSU	Port 02	2	2
Phone/Lock Control	DDCB		Port 03
Unit (DDCB)
Single-wire pair	Standard, one for	QSTU	(Circuits 1 ~ 2)	—	2
devices:	each device (voice
• Standard	mail devices may
Telephone	require more than one
• Voice Mail Device	circuit)
• Facsimile Machine
• Modem
• Dictation
Equipment
Alternate	Standard port for the	QSTU	(Circuit 2)	1	1
Background Music	source		Port 19
Source*

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

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TABLE 3-H

STRATA DK16 STATION APPARATUS OVERVIEW

	Type and Number of		Base Unit	Base and Expansion
Station	Circuits Required	PCB or Interface	Capacity	Unit Combined Capacity
Digital Telephone	Digital, one for each	Base Unit (Circuits 1~8)	8	16
(DKT with or without	DKT	PDKU2 (Circuits 1~8)
ADM or PDIU-DI)		KCDU (Circuits 1~4)
Stand-alone Data	Digital, one for each	Base Unit (Circuits 1~8)	8	16
Interface Unit	PDIU-DS	PDKU2 (Circuits 1~8)
(PDIU-DS)		KCDU (Circuits 1~4)
Digital Direct Station	Digital, one for each	Base Unit (Circuit 8)	1	2
Selection Console	DDSS	PDKU (Circuit 8)
(DDSS)
Digital Door	Digital, one for each	Base Unit (Circuit 5)	1	2
Phone/Lock Control	DDCB	PDKU (Circuit 1)
Unit (DDCB)		or first
		KCDU (Circuit 1)
Electronic Telephone	Electronic, one for	PEKU (Circuits 1~8)	0	8
(EKT)	each EKT	PESU (Circuit 5~8)
Electronic Direct	Electronic, two for the	PEKU (Circuits 7 and 8)	0	1
Station Selection	HDSS
Console (HDSS)
Conference Amplifier	Electronic, two for the	PEKU (Circuits 6 and 7)	0	1
	amplifier	PESU (Circuits 6 and 7)
Single-wire-pair	Standard, one for	KSTU (Circuits 1~4)	4	12
Devices:	each device (voice	PSTU (Circuits 1~8)
• Standard Telephone	mail devices may	PESU (Circuits 1~2)
• Voice Mail Device	require more than one
• Facsimile Machine	circuit)
• Modem
• Dictation Equipment
Alternate	Standard or	KSTU (Circuit 4)	1	1
Background Music	Electronic, one for the	PEKU (Circuit 3)
Source	source	PESU (Circuit 8)
		PSTU (Circuit 4)

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

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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 (2000and 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 (PDIU- DI/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).

3.30Electronic Telephone Circuit Connections (STRATA DK16 Only)

3.31There 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.

3.40Standard Telephone Circuit Options

3.41In 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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