Toshiba Strata DK 24 Manual

Digital Key Telephone Systems
DK24, DK56, and DK96
INSTALLATION AND MAINTENANCE MANUAL
RELEASE 1, 2, 3, and 4
©COPYRIGHT 1992
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,includingphotocopying,recording,taping,orinformationretrieval
systems—with the exception of the System Record forms, without written
permission of the publisher of this material.
SERIAL NO. DK R4 D96-IM-DKI/M-R4
4031006

INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
TOSHIBA SYSTEM PRACTICES
DIGITAL KEY TELEPHONE SYSTEMS
RELEASE 1, 2, 3, and 4
INSTALLATION
Chapter One
INTRODUCTION

INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
TABLE OF CONTENTS
PARAGRAPH SUBJECT PAGE
1PURPOSE .............................................................................................................. 1-1
2ORGANIZATION .................................................................................................... 1-1
3REFERENCE 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
4SYSTEM MNEMONICS/TERMS............................................................................ 1-1
4.10 Use of Notes, Important Notes, Cautions, and Warnings.................................... 1-4
5INSPECTION, PACKAGING, and STORAGE ........................................................ 1-5
5.00 Inspection ........................................................................................................... 1-5
5.10 Packaging and Storage ...................................................................................... 1-5
1-i

1-1
INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
1 PURPOSE
1.00 The purpose of this manual is to provide
detailed step-by-step instructions for installing,
programming,andmaintainingtheSTRATADK24,
DK56, and DK96 digital key systems.
1.01 This chapter provides an overview of the
organization of the installation section; a list of
reference documentation that supports the in-
stalled system; a list of system mnemonics; and
inspection, packaging, and storage guidelines.
2 ORGANIZATION
2.00 Theinstallationsectionisorganizedinmodu-
lar chapters for easy removal and replacement of
updated materials. The chapters are as follows:
Chapter One - Introduction
Chapter Two - System Description
Chapter Three - InstallationSiteRequirements
Chapter Four - System Configuration
Chapter Five - KSU Cabinet Installation
Chapter Six - PCB Installation
Chapter Seven - Telephone Installation
Chapter Eight - Peripherals Installation
Chapter Nine - System Wiring and Main Dis-
tributionFrameArrangements
3 REFERENCE DOCUMENTATION
3.00 The STRATA DK systems are supported by
the following complement of reference documen-
tation, in addition to the installation section:
3.10 General Description: An overview of the
three STRATA DK systems and their features.
3.20 Programming: Provides detailed step-by-
step instructions on how to program each system.
Alsoprovidestables,calledSystemRecordSheets,
on which all programming and configuration infor-
mation can be recorded.
3.30 User Guides: Provide step-by-step instruc-
tions on how to operate stations connected to the
STRATA DK system. There are separate user
guides for the digital telephone, electronic tele-
phone, standard telephone, digital telephone Liq-
uid Crystal Display (LCD), electronic telephone
LCD, direct station selection console, and data
interface unit.
3.40 Fault Finding Procedures: Hardware trou-
bleshooting and diagnostic information presented
in flowchart form.
3.50 RemoteMaintenanceandAdministration:
Programming and maintenance procedures spe-
cially adapted for remote maintenance and ad-
ministration terminal use. Detailed, step-by-step
instructionsareprovided,completewiththetermi-
nal responses.
NOTE:
These procedures also apply when using a
localASCIIterminalconnecteddirectlytothe
DK system.
4 SYSTEM MNEMONICS/TERMS
4.01 Mnemonicsareusedtoidentifythesystem’s
hardware, operation, and features. The following
alphabeticallistingdescribesthemnemonicsused
in this manual.
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, E & M TIE lines, Centrex
lines,etc.)fortheimmediategeographicalarea.
CO Line: A term used to define the STRATA DK
hardware circuit that connects to the central
office network line pair. Each CO line and TIE
line circuit is assigned a CO line number in
system software.
CODECs: Coder/Decoder—Semiconductors that
allow the system to process analog-to-digital
and digital-to-analog conversions.
CRCU-4: An optional upgrade to the system’s
controllerprintedcircuitboard(PCTUorPCTUS)
that provides a 4-circuit Dual-tone Multi-fre-
quency (DTMF) receiver for system Direct In-

INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
1-2
ward System Access (DISA) CO lines, E & M
TIE lines, and stations and peripherals that
connect to standard telephone circuits.
CRCU-8: An optional upgrade to the system’s
controllerprintedcircuitboard(PCTUorPCTUS)
that provides an 8-circuit Dual-tone Multi-fre-
quency (DTMF) receiver for system Direct In-
ward System Access (DISA) CO lines, E & M
TIE lines, and stations and peripherals that
connect to standard telephone circuits.
DDCB(Release4):DigitalDoorPhone/LockCon-
trol Unit—A peripheral hardware unit compat-
ible with designated digital telephone circuits
that supports optional door phones (MDFBs)
and provides door lock control.
DDSS (Release 3 and Higher): Digital Direct
StationSelection Console—Adevicethathelps
facilitate the processing of a heavy load of
incoming calls. The DDSS connects only to
designateddigitaltelephonecircuits,butcanbe
associatedwith electronicordigitaltelephones.
DISA (Release 2 and Higher): Direct Inward
System Access—A feature that allows an out-
side party to access a STRATA DK system’s
internal stations or outgoing CO lines without
having to go through an operator or automated
attendant.Anoptional securitycodemaybeset
toprevent unauthorizedaccess tooutgoing CO
lines for through system calling.
DK: Digital Key.
DPFT: Power Failure/Emergency Transfer Unit—
An optional backup unit that provides emer-
gency service during power failures by auto-
matically connecting standard telephones to
designated CO lines.
DSS: Direct Station Selection—Feature which al-
lows a telephone user (as well as a DDSS
consoleoraHDSSconsoleuser)tocallanother
stationwiththetouchofaflexiblefeaturebutton.
DTMF: Dual-tone Multi-frequency—Push-button
dialing.
DVSU (Release 3 and Higher): A subassembly
that equips a digital telephone with Off-hook
Call Announce capability.
EOCU: Off-hook Call Announce Subassembly—
An optional upgrade to the Electronic Tele-
phoneInterfaceUnit(PEKU)thatenablesprop-
erly configured telephones (see HVSU2) that
are connected to it to receive Off-hook Call
Announce calls.
FCC:FederalCommunicationsCommission—The
federalagencywhichregulatesthetelecommu-
nication industry. All Toshiba hardware is FCC
listed or approved.
HDCB:ElectronicDoorPhone/LockControlUnit—
Aperipheralhardwareunitcompatiblewithdes-
ignated electronic telephone circuits that sup-
ports optional door phones (MDFBs) and pro-
vides door lock control.
HDSS: Electronic Direct Station Selection Con-
sole—Adevicethathelpsfacilitatetheprocess-
ingofaheavyloadofincomingcalls.TheHDSS
console connects only to designated electronic
telephone circuits, but can be associated with
digital or electronic telephones.
HESB: External Speaker Box—A speaker/ampli-
fier that can be configured with the system to
provide a variety of functions, such as a paging
speaker and/or Background Music speaker.
HESC-65A: A cable used to connect a HHEU-
equippeddigitaltelephoneoranHHEU-equipped
electronictelephonetoanexternalspeakerbox
(HESB) for the Loud Ringing Bell feature.
HHEU: Loud Ringing Bell/Headset Interface Up-
gradeUnit—Asmallprintedcircuitboard(PCB)
upgrade that fits inside a digital telephone or a
6500-series Electronic Telephone to allow an
external speaker box (HESB) and/or a headset
to be connected to the telephone.
HVSU2: Subassembly that fits into a 6500-series
Electronic Telephone to give it Off-hook Call
Announce (OCA) capability. In addition, the
telephone must be connected to an Electronic

1-3
INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
TelephoneInterfaceUnit(PEKU)oraStandard
Telephone/Electronic Telephone Interface Unit
(PESU) equipped with an Off-hook Call An-
nounce subassembly (EOCU) to receive OCA,
and must have three-pair wiring and modular
cord.
IMDU: Remote Maintenance Modem Interface
Unit—A subassembly installed on an option
interface unit (PIOU or PIOUS) that allows the
system to be connected with a remote mainte-
nance/administration terminal.
KSU: Key Service Unit—The system’s cabinet
with its common equipment.
LCD: LiquidCrystal Display—The display ondigi-
tal and electronic telephones.
LED: Light Emitting Diode—Status indicators lo-
cated on printed circuit boards (PCBs), digital
telephones, and electronic telephones.
LSI: Large Scale Integration—Related to circuit
design technology. STRATA DK printed circuit
boards (PCBs) 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.
OCA: Off-hook Call Announce.
PBTC: A Toshiba-supplied cable used to connect
customer-supplied batteries to any DK PPSU
power supply for emergency reserve power.
PBX: Private Branch Exchange—Industry-stan-
dard term which refers to a telephone switch,
usuallyon-premises,whichservesanindividual
company, and is connected to a public tele-
phone exchange through the Central Office
(CO).
PCB: Printed Circuit Board.
PCM:PulseCodeModulation—Awidely-usedform
of digital telephone switching.
PCOU1: CO Line Interface Unit—An optional
printed circuit board (PCB) that provides the
system with four CO lines.
PCOU2: Replaces PCOU1 and works exactly the
same way as PCOU1.
PCTU:CommonControlUnit—Thesystem’scon-
troller printed circuit board (PCB) that can sup-
port up to 14 universal slots, 96 station ports,
and36COlines.Therearefoursoftwareversions
of the PCTU—PCTU1, PCTU2, PCTU3, and
PCTU4—each of which can be installed in any
STRATA DK system and supports a unique set
of features.
PCTUS: Common Control Unit—A Release 2
controller printed circuit board (PCB) designed
fortheDK24thatcansupportuptosixuniversal
slots, 24 station ports and 16 CO lines.
PDIU-DI/PDIU-DI2 (Release 3 and Higher): Inte-
grated Data Interface Unit—Replaces the nor-
mal digital telephone base to enable the tele-
phone to be used for the transmission and
reception of data between a terminal/personal
computer connected to the telephone and de-
vices connected to other PDIU-DIs or to mo-
dems, printers, and computers connected to
PDIU-DSs.ThePDIU-DIisalsousedtoprovide
personal computer access to outside dial-up
dataservicesand/orbulletinboardsviamodem
pooling.
NOTE:
ThePDIU-DIand thePDIU-DI2 areidentical,
except that the PDIU-DI attaches to 1000-
series Digital Telephones, while the PDIU-
DI2 attaches to 2000-series Digital Tele-
phones.
PDIU-DS (Release 3 and Higher): Stand-alone
Data Interface Unit—Used for modem pooling,
printer sharing, and accessing host/mainframe
computer.
PDKU1 (Release 3 and Higher): Digital Tele-
phone Interface Unit—An optional printed cir-
cuit board (PCB) that provides the system with
eight digital telephone circuits. In addition to

INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
1-4
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). PDKU1 sup-
ports DIUs or circuit 1~7 only.
PDKU2: The PDKU2 replaces PDKU1. PDKU2 is
identical to the PDKU1, except that the PDKU2
supports DIUs on all circuits (1~8).
PEKU: Electronic Telephone Interface Unit—An
optional printed circuit board (PCB) that pro-
videsthesystemwitheightelectronictelephone
circuits,whichcansupportelectronictelephones,
a Background Music source, a door phone/lock
controlunit(HDCB),anelectronicDSSconsole
(HDSS), and amplifiers for two CO-line confer-
ence calls.
PEMU: E & M TIE Line Unit—An optional printed
circuit board (PCB) that provides the system
with support for four E & M Type I TIE lines.
PEPU: External Page Interface Unit—An optional
printed circuit board (PCB) that provides sup-
port and/or circuit interface mainly for optional
hardwareperipheralsandupgradesassociated
with external paging functions.
PESU (Release 2 and Higher):
Standard Tele-
phone/Electronic Telephone Interface Unit—An
optionalprintedcircuitboard(PCB)thatprovides
the system with a combination of two standard
and four electronic telephone circuits. The stan-
dard telephone circuits can support standard
telephones and optional hardware peripherals,
such as voice mail devices and fax machines.
Except for the Electronic DSS Console, the
PESUelectronictelephone circuitscansupport
thesamestationsandperipheralsthatthePEKU
does.
PIOU: Option Interface Unit—An optional printed
circuitboard(PCB)thatprovidessupportand/or
circuit interface for optional hardware peripher-
als and upgrades.
PIOUS:ThesameasthePIOU,withsomeexcep-
tions;mostnotably,thePIOUShasoneexternal
paginginterface zone,while the PIOU has four.
NOTE:
Each system will support only one of the
following PCBs: PIOU, PIOUS or PEPU.
Port: A term used to identify a station circuit
location. Each station and TIE line hardware
circuitisassignedtoastationportnumber(00~
95) in system software.
PPTC: A Toshiba-supplied adapter that is used to
connectthemodularSMDRand/ormaintenance
ports of the PIOU or PIOUS to the DB-25 con-
nector of a printer, terminal, modem, or call
accounting machine.
PSTU1: Standard Telephone Interface Unit—An
optional printed circuit board (PCB) with a built-
inringgeneratorthatprovidesinterfaceforeight
standard telephones or optional hardware pe-
ripherals (voice mail devices, a Background
Music source with Release 4, fax machines,
etc.).
PSTU2:StandardTelephoneInterfaceUnit—Pro-
vides same function as the PSTU1 with the
addition of a switch to select high or low ringing
generator voltage.
RAM: Random Access Memory—Refers to the
type of system memory that holds individual
systemconfigurationandfeatureprogramming.
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’ func-
tions. ROM is only revised by Toshiba software
engineers.
4.10 Use of Notes, Important Notes, Cautions,
and Warnings
4.11 Notescallattentiontospecificitemstoelabo-
rate, or to refer the reader to other information.
4.12 ImportantNotesare usedwhen the informa-
tion is considered to be very important.

1-5
INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
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.
5 INSPECTION, PACKAGING,
and STORAGE
5.00 Inspection
5.01 When the system is received, examine all
packages carefully and note any visible damage.
Ifanydamageisfound,donotopenthepackages.
Contactthedeliverycarrierimmediatelyandmake
the proper claims.
5.02 Checkthesystemagainstthepackingslip.If
itisdeterminedthatequipment is missing,contact
thedeliverycarrierandyoursupplierimmediately.
5.03 Afterunpacking(andbeforeinstalling),check
the system against the packing list and inspect all
equipment for damage. If equipment is missing or
damaged, contact your supplier immediately.
5.04 Be sure to retain original packaging materi-
als for reuse when storing or transporting system
hardware.
5.10 Packaging and Storage
CAUTION!
When handling (installing, removing, ex-
amining) printed circuit boards (PCBs),
do not touch the back (soldered) side or
edge connector. Always hold the PCB by
its edges.
5.11 When packaging and storing the system,
removePCBs fromthe systemcabinet (thepower
supply may remain installed in the cabinet for
storageandshipment).PCBsshouldbepackaged
intheiroriginalantistaticbagsforprotectionagainst
electrostaticdischarge.Besuretopackageequip-
ment in its original shipping containers.

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
TOSHIBA SYSTEM PRACTICES
DIGITAL KEY TELEPHONE SYSTEMS
RELEASE 1, 2, 3, and 4
INSTALLATION
Chapter Two
SYSTEM DESCRIPTION

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
TABLE OF CONTENTS
PARAGRAPH SUBJECT PAGE
1GENERAL .............................................................................................................. 2-1
1.10 System Description............................................................................................. 2-1
2SYSTEM TECHNOLOGY ...................................................................................... 2-1
2.00 Custom Electronic Circuitry ................................................................................ 2-1
2.10 Microprocessors ................................................................................................. 2-1
2.20 Stored Programming .......................................................................................... 2-2
2.30 Pulse Code Modulation (PCM) ........................................................................... 2-2
3KEY SERVICE UNITS (KSU)................................................................................. 2-2
3.10 DK24 KSU Interior .............................................................................................. 2-2
3.20 DK56 KSU Interior .............................................................................................. 2-2
3.30 DK96 KSU Interior .............................................................................................. 2-4
4POWER SUPPLIES ............................................................................................... 2-4
4.10 Reserve Power ................................................................................................... 2-5
4.20 Battery Charger .................................................................................................. 2-6
5POWER FAILURE/EMERGENCY TRANSFER UNIT (DPFT)................................ 2-6
6PRINTED CIRCUIT BOARD (PCB) DESCRIPTIONS ............................................ 2-7
6.10 Printed Circuit Boards......................................................................................... 2-8
7SYSTEM CONTROLS AND INDICATORS............................................................ 2-13
8PERIPHERAL EQUIPMENT .................................................................................. 2-13
8.00 Digital Telephones.............................................................................................. 2-13
8.10 Electronic Telephones........................................................................................ 2-19
8.20 Digital and Electronic Telephone Upgrade Options ............................................ 2-19
8.30 Direct Station Selection Consoles ...................................................................... 2-19
8.40 Toshiba-supplied Peripherals............................................................................. 2-20
8.50 Customer-supplied Peripherals .......................................................................... 2-20
TABLE LIST
TABLE TITLE PAGE
2-A TYPICAL RESERVE POWER FUNCTION ESTIMATES........................................ 2-6
2-B COMMON CONTROL UNIT DATA ........................................................................ 2-9
2-C INTERFACE PCB OPTIONS ................................................................................. 2-9
2-D DK24 MODEL CONTROLS AND INDICATORS..................................................... 2-15
2-E DK56 MODEL CONTROLS AND INDICATORS..................................................... 2-16
2-F DK96 MODEL CONTROLS AND INDICATORS..................................................... 2-17
2-F DK96 MODEL CONTROLS AND INDICATORS (continued).................................. 2-18
2-G PCB CONTROLS AND INDICATORS ................................................................... 2-18
FIGURE LIST
FIGURE TITLE PAGE
2-1 DK24/56/96 KSUs .............................................................................................. 2-1
2-2 DK24 KSU INTERIOR........................................................................................ 2-3
2-3 DK56 KSU INTERIOR........................................................................................ 2-3
2-4 DK96 KSU INTERIOR........................................................................................ 2-4
2-i

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
2-ii
2-5 DK24 POWER SUPPLY FRONT PANEL........................................................... 2-5
2-6 DK56 POWER SUPPLY FRONT PANEL........................................................... 2-5
2-7 DK96 POWER SUPPLY FRONT PANEL........................................................... 2-5
2-8 POWER FAILURE TRANSFER UNIT (DPFT) .................................................... 2-7
2-9 DPFT FUNCTIONAL BLOCK DIAGRAM ........................................................... 2-7
2-10 SYSTEM FUNCTIONAL BLOCK DIAGRAM....................................................... 2-10
2-10 SYSTEM FUNCTIONAL BLOCK DIAGRAM (continued).................................... 2-11
2-11 LOCATION OF DK24 CONTROLS AND INDICATORS ..................................... 2-13
2-12 LOCATION OF DK56 CONTROLS AND INDICATORS ..................................... 2-13
2-13 LOCATION OF DK96 CONTROLS AND INDICATORS ..................................... 2-13
2-14 LOCATION OF PCB CONTROLS AND INDICATORS....................................... 2-14

2-1
INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
1 GENERAL
1.00 This chapter provides an overview of the
technology employed in the STRATA DK system
design and a detailed description of the system
hardware, including the basic equipment cabinet
(key service unit), printed circuit board (PCB)
options, and system peripheral equipment. A de-
scription of system controls and indicators is also
provided.
1.10 System Description
1.11 ThemainunitofeachSTRATADKsystemis
the KSU (Figure 2-1), which houses the power
supply and a number of slots which can support a
number of optional PCBs, to which stations and
peripherals are connected. The quantity and type
of PCBs, stations, and peripherals installed de-
pends on the user’s requirements. The primary
differencesbetweentheSTRATADKsystemsare
KSU sizes, PCB capacities, and power supplies.
1.12 Hardware for all three system types is iden-
tical, with the exception of the KSUs and power
supplies. Differences between models are identi-
fied, as applicable.
2 SYSTEM TECHNOLOGY
2.00 Custom Electronic Circuitry
2.01 STRATADKsystemcircuitryemploysLarge
Scale Integration (LSI) technology to increase
system efficiency, while allowing a reduction in
physical size. Use of CMOS circuits, when appli-
cable,minimizesthesystem’spowerrequirements.
2.10 Microprocessors
2.11 Main Microprocessor. The STRATA DK
systems employ a 16-bit, 68000-type micropro-
cessor, which operates at a speed of 8 MHz, for
storedprogram control. Themain microprocessor
FIGURE 2-1
DK24/56/96 KSUs
Strata
DK96
TOSHIBA
Strata
DK56
TOSHIBA
TOSHIBA
DK24
Strata

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
2-2
is located on the common control unit (PCTU or
PCTUS) printed circuit board (PCB).
2.12 LocalMicroprocessors.MostPCBsandall
digital and electronic telephones have 8-bit,
TMP90C840-type local microprocessors which
operate at a speed of 10 MHz.
2.20 Stored Programming
2.21 SystemOperatingSoftware.Systemoper-
ating software is stored in Read Only Memory
(ROM), and is revised only by Toshiba software
engineers.
2.22 ConfigurationandCustomProgramming.
Each STRATA DK system’s individual configura-
tionandcustomprogrammingisstoredinRandom
Access Memory (RAM). The content of system
RAMis user-developed and-programmed, based
on the system’s configuration and the user’s re-
quirements.SystemRAMisprotected by alithium
battery with a shelf life of at least six years.
2.30 Pulse Code Modulation (PCM)
2.31 PCM technology allows fully non-blocking
intercom and outside line talk paths. Talk paths
operate through digital switching, as opposed to
analog crosspoints. Analog-to-digital and digital-
to-analogconversion is accomplishedby CODEC
integrated circuits.
3 KEY SERVICE UNITS (KSU)
3.01 The STRATA DK KSUs are single, free-
standingcabinetsthatcanbeconfiguredforeither
wall or table-top mounting. One-inch rubber feet
on the base of the cabinet ensure that proper
clearanceismaintainedwhentheKSUistable-top
mounted. The KSU interior houses the printed
circuitboard(PCB)shelvesandthepowersupply.
3.02 External dimensions and approximate
weightsfortheDK24,DK56,andDK96modelsare
listed below. Weights are based on cabinets con-
taining a full complement of PCBs.
DK24 Height:10.6 in. (269 mm)
Width: 16.0 in. (406 mm)
Depth: 9.0 in. (229 mm)
Weight: 19.4 lbs (9 kg)
DK56 Height:15.0 in. (381 mm)
Width: 16.0 in. (406 mm)
Depth: 9.0 in. (229 mm)
Weight: 37.5 lbs (17 kg)
DK96 Height:18.6 in. (475 mm)
Width: 19.6 in. (500 mm)
Depth: 9.0 in. (229 mm)
Weight: 55.1 lbs (25 kg)
3.10 DK24 KSU Interior
3.11 TheDK24KSUinteriorhasoneshelf(Figure
2-2)withsevenavailablePCBslots,labeledPCTU
and S01 ~ S06. Only the PCTU slot serves a
dedicated function.
3.12 PCB slots S01 ~ S06 each incorporates a
standard 40-pin female connector located in the
same vertical position on the KSU’s backplane.
This standardization enables any of the optional
PCBs to be installed in any slot. The PCTU slot
incorporates the same 40-pin female connector,
but it is set 0.25-inch higher, so that only a PCTU
or PCTUS PCB may be installed in the slot.
3.13 The power supply is factory-installed,
mounted vertically into the right side of the PCB
shelf,andissecuredwithtwocombinationslotted/
Phillips mounting screws at the right side of the
cabinet.
3.20 DK56 KSU Interior
3.21 The DK56 KSU interior also has just one
shelf (Figure 2-3), but with nine available PCB
slots. These slots are labeled PCTU and S01 ~
S08; only the PCTU slot serves a dedicated func-
tion.
3.22 PCB slots S01 ~ S08 each incorporates a
standard 40-pin female connector located in the

2-3
INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
PCTU S01 S02 S03 S04 S05 S06
+
_BATT
LG
FG
D
D
ON
OFF
POWER
FG
-24V1-24V2
SG
FG
PPSU 24
POWER
-5V
+5V
-24V OUT
CONNECTOR
PCB SLOTS
POWER
SUPPLY
D D
PPSU56
-24V1-24V2-24V3DC OUT
POWER +5V -5V
BATT
+_SG FG LG FG
ON
OFF
AC IN
1
6
FG
PCTU
PCTU S01 S02 S03 S04 S05 S06 S07 S08
POWER
SUPPLY
PCB SLOTS
CONNECTOR
FIGURE 2-3—DK56 KSU INTERIOR
FIGURE 2-2—DK24 KSU INTERIOR

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
2-4
FIGURE 2-4—DK96 KSU INTERIOR
-24V4
-24V1
-24V3
ON
OFF
PCTU S09 S10 S11 S12 S13 S14
FG
PCTU
AC IN
POWER
-5V
+5V1
+5V2
DC OUT
-24V5
-24V2
+5V1
+5V2
PPSU96
+
_BATT
SG
FG
LG
FG
1
6
S01 S02 S03 S04 S05 S06 S07 S08
D
D
PCB SLOTS
CONNECTOR
POWER
SUPPLY
same vertical position on the KSU’s backplane.
This standardization enables any of the optional
PCBs to be installed in any slot. The PCTU slot
incorporates the same 40-pin female connector,
but it is set 0.25-inch higher, so that only a PCTU
PCB may be installed in the slot.
3.23 The power supply is factory-installed,
mounted horizontally above the PCB shelf, and is
secured with four combination slotted/Phillips
mounting screws.
3.30 DK96 KSU Interior
3.31 The DK96 cabinet interior has two shelves
(Figure2-4).ThetopshelfhaseightavailablePCB
slots labeled S01 ~ S08. The bottom shelf has
sevenavailable PCB slots labeled PCTUand S09
~ S14. Only the PCTU slot serves a dedicated
function.
3.32 PCB slots S01 ~ S14 each incorporates a
standard 40-pin female connector located in the
same vertical position on the KSU’s backplane.
This standardization enables any of the optional
PCBs to be installed in any available slot. The
PCTU slot incorporates the same 40-pin female
connector, but it is set 0.25-inch higher, so that
only a PCTU PCB may be installed in the slot.
3.33 The power supply is factory-installed,
mounted vertically to the right of the two PCB
shelves, and is secured with four combination
slotted/Phillips mounting screws.
4 POWER SUPPLIES
4.00 STRATA DK systems incorporate single-
chassis,switching-typepowersupplies.Thepower
suppliesforthethreemodelsarefunctionallyiden-
tical (except for power capacity), although they
differ in appearance due to cabinet sizes and
mountingconsiderations.TheDK24modelusesa
PPSU24 power supply (Figure 2-5), DK56 uses a
PPSU56 (Figure 2-6), and DK96 uses a PPSU96
(Figure 2-7).

2-5
INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
4.01 The power supplies generate ±5VDC and -
24VDC output voltages (that are protected by
mechanical circuit breakers located on the power
supply front panel). Input voltage is provided by a
standard 117VAC, 15 amp circuit. Electrical char-
acteristics include:
• Primary Power
§ Input AC: 85VAC ~ 135VAC
§ AC Frequency: 50/60 Hz
§ Wattage: DK24/65, DK56/140,
DK96/230
• DC Voltage Output Specifications
§ -24VDC; -26.3 ~ -27.8
§ +5VDC; +4.5 ~ +5.5
§ -5VDC; -4.5 ~ -5.5
• Circuit Breakers
§ 24; -24V
§ 56; -24V
§ 96; -24V, +5V
4.10 Reserve Power
4.11 Twocustomer-supplied,12-voltbatteries(80
ampere hours maximum) can be connected in
series to the STRATA DK system as a power
failure backup. In the event of a power failure, the
systemautomaticallyswitchesovertobatterypower
without any interruption to existing calls or other
normal system functions. The length of time re-
serve power operates depends on the system
size,numberofbatteriesprovided,andthesystem
load. Typical reserve power duration estimates
are provided in Table 2-A.
FIGURE 2-5
DK24 POWER SUPPLY FRONT PANEL
+
_BATT
LG
FG
D
D
ON
OFF
POWER
FG
-24V1-24V2
SG
FG
PPSU 24
POWER
-5V
+5V
-24V OUT
CIRCUIT
BREAKERS
POWER
SWITCH
AC
POWER
CORD
BATTERY
CONNECTOR
VOLTAGE
LEDs
D D
PPSU56
-24V
1-24V
2-24V 3DC OUT
POWER+5V -5V
BATT
+_SG FG LG FG
ON
OFF
AC IN
VOLTAGE LEDs POWER SWITCH
AC INPUT
BATTERY
CONNECTOR
CIRCUIT
BREAKERS
FIGURE 2-6
DK56 POWER SUPPLY FRONT PANEL
-24V4
-24V1
-24V3
ON
OFF
AC IN
POWER
-5V
+5V1
+5V2
DC OUT
-24V5
-24V2
+5V1
+5V2
PPSU96
+
_BATT
SG
FG
LG
FG
VOLTAGE
LEDs
BATTERY
CONNECTOR
POWER
SWITCH
AC INPUT
RECEPTACLE
D
D
CIRCUIT
BREAKERS
FIGURE 2-7
DK96 POWER SUPPLY FRONT PANEL

INSTALLATION-SYSTEM DESCRIPTION
SECTION 400-096-202
SEPTEMBER 1992
2-6
2
71
1
3
45
1.7
4
31
2.4
5
23
3.1
6
19
3.8
7
16
4.5
8
13.5
5.2
9
11.5
6
10
10
6.6
11
9
7.3
12
8
8
13
7
8.7
14
6
9.4
15
5
10
Quantities of PCBs
Installed (Including PCTU)
Estimated Operation
Time (Hours)
Approximate (-24V) Current
Drain (DC Amperes)
Time is estimated with the following considerations:
(1) Batteries have full charge at start of operation.
(2) Batteries (2 ea.) are connected in series.
(3) Batteries are 12 VDC, rated at 80 amp/hours each.
(4) System is operating at full load traffic with LCD-type telephones.
(5) Batteries used for this test are gel-cell, maintenance-free batteries. Reserve duration will vary
depending on battery type and manufacturer. These figures should only be used as an estimate.
TABLE 2-A
TYPICAL RESERVE POWER FUNCTION ESTIMATES
4.12 AToshiba-supplied,9-footbatterycable,part
numberPBTC,supportsthereservebatteryinstal-
lation.
IMPORTANT NOTES!
1. Local ordinances may dictate battery
type and installation details.
2. The reserve power batteries must be
installed while commercial AC power
is applied to the system to allow the
powersupplyreserverelaytooperate.
If batteries are connected after AC
power is lost, the batteries WILL NOT
powerthesystemandthesystemWILL
NOT operate.
4.20 Battery Charger
4.21 Toallowfull normalsystem operation during
a power failure, the power supply has a built-in,
currentlimitingbatterychargerthatmaintainscus-
tomer-supplied batteries. Electrical characteris-
tics of the battery charger include:
• Nominal float voltage: 2.275 volts/cell
• Charge current: 0.7 amps maximum
• Battery discharge cut-off voltage: 20.5 ±0.5V
5 POWER FAILURE/EMERGENCY
TRANSFER UNIT (DPFT)
5.00 The DPFT provides an optional means of
ensuringuninterruptedtelephone operationinthe
event of a power failure. The DPFT (Figure 2-8)
automatically connects selected CO lines to stan-
dardtelephonelinesintheeventofapowerfailure,
while permitting normal operation when the sys-
tem is in service.
5.01 The DPFT is a self-contained module that
mounts externally to the key service unit (KSU),
typically near the main distribution frame (MDF).
ConnectionstotheCOlines,standardtelephones,
andtheKSUaremadewithtwo50-pinamphenol-
type connectors on the DPFT.
5.02 The DPFT consists of eight normally open
relays,connectingthetelephonestoPSTU(Stan-
dardTelephoneInterfaceUnit)printedcircuitboard
PCB circuits and the CO lines to PCOU (CO Line
Unit) PCB circuits (Figure 2-9). If a power failure
occurs,therelaysclose,connectingthetelephones
directly to the CO lines. Calls can then be placed
from the selected standard telephones over the
CO lines, completely bypassing the system.