Toshiba Strata Dk14, Dk40i, Dk424 General Description Manual

							Strata DK14
System Technology
Strata DK General Description     5/997
System Technology
Pulse Code Modulation 
Digital switching talkpaths enable all CO and intercom lines to be accessed simultaneously. 
Analog-to-digital and digital-to-analog conversion is done by CODECs (coder plus decoder) on 
station and CO line PCBs.
Custom Electronic Circuitry 
Large Scale Integration (LSI) technology makes the Strata DK14 circuit designs simple and 
efficient. Gate arrays using very large scale integration save vast amounts of space by using the 
latest technology. More circuitry fits onto smaller PCBs for a more compact system. Widespread 
use of CMOS circuits minimizes system power requirements.
Stored Program Control 
The system uses a 16-bit microprocessor for stored program control. The Strata DK14 System 
operating software is stored on Read Only Memory (ROM), and individual configuration and 
custom programming is stored on Random Access Memory (RAM). A lithium battery with a life 
span of at least six years preserves RAM in the case of a power failure.
Microprocessors 
The system’s main microprocessor is a 16-bit 68000-type that operates at a clock speed of 
8 MHz. In addition, some PCBs use 8-bit, TMP90C840-type local microprocessors that run at 10 
MHz. This distributed microprocessing architecture is used system wide. 
						

							Strata DK14
Maintenance and Programming
8Strata DK General Description     5/99
Maintenance and Programming
Hardware maintenance and repair procedures describe how to quickly locate, remove, and replace 
defective parts and PCBs. System programming can be performed without taking the system out-
of-service. 
On-site programming can be executed with any 20-button proprietary LCD telephone or with a 
DKAdmin PC connected to an optional maintenance port. 
Off-site programming with DKAdmin, which can help cut costs and save time, is available 
through a customer-provided modem connected to the maintenance port.
DKAdmin/DKBackup
Toshiba DKAdmin Release 4.0 software enables customer data (configuration, station, and system 
options) to be downloaded to a PC and stored on a computer disk. The customer data can be added 
to, or changed, using the PC independent of the DK System.
The new customer data can then be uploaded to the DK System from the PC, changing customer 
program options on-site or remotely over telephone lines and/or modems.
The DKBackup software program is also available. The program consists of a small subset of 
DKAdmin functions which can perform backup, restore and upgrade functions, but cannot edit 
customer databases. 
						

							Strata DK General Description     5/999
Strata DK40i2
This chapter provides an overview of the Strata DK40i System and its capacities.
The Strata DK40i Base Key Service Unit (KSU) is a compact system that provides many of the 
features offered by much larger systems. The KSU is designed for convenient wall-mounting and 
occupies very little space (see Figure 4 and Ta b l e  4.) 
Station and CO Lines
The DK40i Base KSU comes equipped with eight digital telephone station circuits. One of three 
optional PCBs can be added to provide either four loop start or DID lines, or two ISDN BRI S/T 
circuits. An optional TCIU2 Printed Circuit Board (PCB) can be added to the Base KSU loop start 
line PCB to provide Caller ID interface. An optional KSTU2 PCB can be added to provide four 
standard telephone circuits (ports).
NoteAn optional Expansion KSU can be added to the DK40i to increase the system capacity to 
28 station ports and 12 CO lines (see Figure 5). A maximum of 28 station ports and 12 CO 
line interfaces are allowed in the system (Base KSU plus Expansion KSU). Base capacity 
is 12 station ports and 4 CO line interfaces.
Figure 4 Base Key Service Unit (KSU) Figure 5 KSU with Expansion Unit
AC DC
POWER
4247
AC DC
POWER
1711 
						

							Strata DK40i
Peripherals
10Strata DK General Description     5/99
Peripherals
The DK40i Base KSU can support a number of peripherals, which are not considered as stations or 
lines and do not affect the maximum station and line capacities. The DK40i Base KSU comes 
standard with built-in interfaces for connecting the following dealer-supplied equipment: an 
amplifier and speaker for paging and night ringing, Music-on-Hold (MOH) source, reserve power 
batteries, and emergency standard telephone for system power failure occurrences when using 
loop start lines in the base cabinet.
A relay contact is also provided to control one of the following peripherals: MOH source, night 
bell, or page amplifier mute control.
An optional KSTU2 PCB provides an alternate background music source interface. The music 
plays through Toshiba telephone speakers, as opposed to the external page speakers. 
The optional TSIU PCB provides two RS-232 interface ports to connect two of three options: a 
DKAdmin PC (or external modem for remote maintenance); or VM SMDI; or an SMDR port to 
connect a call accounting device or printer. An Expansion Unit RS-232 interface PCB is required 
if all three features are needed.
Table 4  KSU and Expansion Unit Specifications
UnitWeightHeightWidthDepth
Key Service Base Unit 8.4 lbs. 
(3.8 kg)18.0 inches
(457 mm)12.2 inches
(310 mm)3.4 inches
(86 mm)
Expansion Unit1 lb. empty 
(0.45 kg)
4.3 lbs. full 
(2.4 kg)18.0 inches
(457 mm)7.8 inches
(198 mm)3.4 inches
(86 mm) 
						

							Strata DK40i
Base KSU Architecture
Strata DK General Description     5/9911
Base KSU Architecture
The Strata DK40i Base KSU contains the main processor, operating software, circuitry and the 
following components (see Figure 6). 
Figure 6 Base KSU Interior
Digital Telephone Circuits
The main circuit board (TMAU2) in the Strata DK40i Base KSU has eight integrated circuits that 
can connect to Toshiba-proprietary digital telephones (including the cordless telephone), Stand-
alone Data Interface Units (PDIU-DSs), Digital Door Phone/Lock Control Units (DDCB), and 
Digital Direct Station Selection Consoles (DDSS).
Furthermore, each of the digital telephones can support a PC Data Interface Unit (RPCI-DI) or up 
to two Add-on Modules (DADMs).
Central Office (CO) Line Circuits (TCOU/TDDU/TBSU)
A TCOU PCB can be installed in the Base KSU to provide four circuits for loop start CO lines. Or, 
a TDDU PCB can be installed to provide four circuits for Direct Inward Dialing (DID) lines. Or, 
the TBSU can be installed to provide two circuits for BRI lines or stations (see TBSU below).
The CO line interface and DID interface unit can be programmed for DTMF or dial pulse signaling 
and each line has a switch to control potential excess volume that could be created by a nearby 
PBX or CO. Built-in gas tubes help protect each TDDU and TCOU line from lightning. An 
optional RDDU (for DID lines) installed in the Expansion Unit requires an external secondary 
protector. DID lines require the optional K5RCU2 tone receiver.
FG2
POWER SUPPLY ASSEMBLYMODELINPUT: AC127V 2.2A 60 HZOUTPUT: -27.3V 2.8A. -27.3V 0.2A
V. 1A 1996-05 00001TOSHIBA CORPORATIONTPSU16AMADE INWARNINGHazardous voltage inside!If servicing required
remove A. C. plug.
12
+-BATTPN2 12AC DC
DC  POWER
TMAU2AOFF
ON
4238
Connect Expansion
Unit TB1 TO FG2
Expansion KSU
Cable ReceptacleImportant Notice
Battery Jumper
-24 Volt Circuit
BreakersReserve Power
Battery Jack
Base Telephone
Tip/Ring and 
Relay Contact
Music-on-Hold
Input
Music-on-Hold
Sensitivity Adjustment
IMPORTANT: DKSUE16A is incompatible with this unit
DKSUET16A or DKSUE40A  is required for expansion 
						

							Strata DK 40i
ISDN BRI S/T Circuits (TBSU) 
						

							Strata DK40i
Base KSU Architecture
Strata DK General Description     5/9913
Only one TSIU can be installed per DK40i system. When the TSIU PCB is installed, the PIOU can 
still be installed for zone paging, control relays, and an SMDR RS-232 interface, built-in (IMDU) 
maintenance modem, or an SMDI or maintenance interface.
Power Supply
The power supply generates +5VDC and -24VDC for the entire system, even in its expanded 
configuration. (See Ta b l e  5 for a summary of electrical/environmental characteristics.)
The power supply provides a built-in charger for the batteries (see Ta b l e  6). Two customer-
supplied 12-volt batteries can be connected to the power supply to maintain fully functioning 
operation during a power failure.
Table 5  Summary of Electrical/Environmental Characteristics 
 DK40i Primary Power
Input AC
AC frequency
Power
AC input current115VAC 
± 10VAC
50/60 Hz
75 watts maximum
1.8A maximum
Environmental Specifications
Operating temperature
Operating humidity
Storage temperature32~104° F (0 ~40° C)
20~80% relative humidity without condensation
-4~158° F (-20~70° C)
Power Supply
DC voltage output specification-24VDC (-25.94~-28.66VDC)
+5VDC (+4.5~+5.5VDC)
-5VDC (-4.5~-5.5VDC) - Expansion KSU only
Battery Charger Characteristics
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
KSTU2
Ring voltageSquare 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)
Ringing capability 2 ringers maximum per circuit, high or low position
 RSTU2 or RDSU 
Ring voltage 80V RMS sine wave
Ringing capability one ringer per circuit, with or without Message Waiting
RSTU2 (only) Message Waiting voltage -90 VDC/one telephone per circuit (max.)
RSTU2 or RDSU modem interface data rate 14,400 bps maximum 
						

							Strata DK40i
Expansion KSU Architecture
14Strata DK General Description     5/99
Power Failure Interface
The Base KSU provides an interface for a dedicated backup standard telephone during an AC 
input power failure. If the system AC input power fails, the backup telephone automatically 
connects to the CO1 line. The backup telephone is disabled when the system operates during 
normal power conditions.
This feature is independent of Battery Backup and is available when loop start lines are installed in 
the Base KSU. A power failure telephone cannot be installed for DID lines.
Music-on-Hold Interface
Customers can connect their own MOH source to this interface. The source can also feed external 
page speakers and telephone speakers with BGM.
©Paging Interface – This 600-ohm interface supports a Toshiba External Speaker (HESB) or a 
customer-supplied amplifier and speaker for Paging, Night Ringing over Page, and BGM.
©Flexible Relay Contacts – A relay contact can be programmed to either mute BGM during a 
page announcement over external speakers, to operate a device: i.e., an answering machine or 
ringing bell during the Night Mode, or to provide on-off control for a MOH source.
Expansion KSU Architecture
The optional Expansion KSU, which attaches 
easily to the side of the Base KSU, offers four 
universal slots that can host a variety of line and 
telephone PCBs (see Figure 7). See Chapter 4 – 
Universal Slot PCBs for descriptions of PCBs.
Table 6 Typical Reserve Power Duration Estimates
DescriptionDK40i Base KSUDK40i Expansion KSU
No KSTU2KSTU21 PCB2 PCBs3 PCBs4 PCBs
Approximate (-24V) current drain (DC amps.) 1.0 1.2 1.6 2.0 2.4 2.8
Estimated battery operation time (in hours) 75.0 58.0 41.0 31.0 25.0 20.0
Reserve power time estimates assume the following:
• Batteries are fully charged at start of operation and two batteries are connected in a series (12 VDC, rated 80 amp/hours each).
• Batteries used for this test are gel-cell and maintenance free. Reserve duration will vary depending upon battery type, age, and 
manufacturer. These figures should be used as an estimate.
• AC power must be available when first installing reserve power batteries.
Expansion 
PCB SlotsStrata DK40i
Expansion KSU
Expansion Cover Side
CoverStrata DK40i
Base KSU
4243
Figure 7 Expansion KSU Interior 
						

							Strata DK40i
Typical Line Configurations
Strata DK General Description     5/9915
Typical Line Configurations
This section shows the maximum basic and CO configurations that are possible with the DK40i. 
There is a variety of configuration combinations of digital and standard telephones with CO lines, 
including loop start, ground start, Tie, and DID lines. Any loop or ground start CO line can be 
equipped with Caller ID. 
DK40i Line and Station Capacity
The following table shows maximum capacity for a DK40i system (see Ta b l e  7). See the Strata 
DK Installation and Maintenance Manual, Chapter 2 – DK40i Configuration for details. 
Table 7 Maximum CO Lines/Ports and BRI Line and Station Circuits
Attaining maximum system capacities depends on power consumption of a particular 
configuration. Power factor calculations in accordance with the Strata DK I&M Manual will 
determine if the maximum capacities in these tables can be reached.
Stations can be a combination of ISDN TE-1 and TA S-type devices and digital, electronic or 
standard telephones. CO line combinations include ground or loop start, DID, Tie or ISDN BRI. 
Each BRI line circuit uses up two CO lines at system capacity. All other line circuits use up one 
CO line of system capacity.
Each BRI station circuit uses up to two station ports of system capacity. All other station circuits 
use up one station port of system capacity.
Table 8 Typical Maximum Capacity Examples with ISDN BRI (S/T and/or U-type) Circuits
Network Requirements
See Table 37 on Page 110 for network requirements of station and line PCBs and interface cards.
HardwareMaximum 
Allowed
CO Lines 12
Station Ports 28
BRI Line Circuits 6
BRI Station Circuits 10
BRI Station 
CircuitsBRI Station 
B channelsOther Station 
CircuitsBRI Line 
CircuitsBRI Line
B channelsOther Line 
Circuits
10 20 8 6 12 0
816 1248 4
612 1648 4
48 20612 0
48 2048 4
24 2424 8
0 0 28 0 0 12 
						

							Strata DK40i
Functional Block Diagram
16Strata DK General Description     5/99
Functional Block Diagram
See Figure 8 shows the Strata DK40i Base and Expansion KSU PCBs and the available lines, 
stations and peripherals. Basic voltage and cabling information is also included.
Figure 8 Functional Block Diagram
_
+
Amp
Interface Box
DIUPOWERREADYCONNECT
•
•
•
TCIU2
U
Uor
TBSU
Night Bell, BGM Mute 
or MOH (Control Relay) Digital Telephone
and Add-on Module
AA Digital 
Announcer TCOU Line OnlyMOH/BGM Source
DDCB
MDFB Digital Telephone and DSS Console
Voice Mail E911
Alternated BGM SourceStandard TelephoneDoor Phones 
and Lock Control
25-Pair
Amphenol
Connector
Digital Telephone with
Integrated Data Interface
Stand-alone
Data Interface
Electronic TelephonePrinter
Door Phones And Lock Control DDCB
TA or TE-1 BRI (S/T)MDFB
DK40i Base Key
Service Unit
DK40 Expansion Key
Service Unit
TPSU16A
TSIU
DID or CO1
DID or CO2
DID or CO3
DID or CO4
T
T
NT1BRI
NT1BRI
REMU (4)
RGLU (4)
RCIU2 (4)
RCIS (4)
RBSU/
RBSS
RDDU (4) RCOU (4)
Line PCBs
Charger
BATT AC 
INPUT
TMAU2
Common
Control
and
Digital
Tele-
Phone
Ckts (8)
Interface
Digital Modular Connectors
Optional
Standard
Telephone
Ckts (4)
KSTU2
TBSU
TCOU
or
TDDUOptional
DTMF/ABR
RCVRS (5)
K5RCU Auto
Attendant
Key
KKYS1 (AA)RCA JacksSpeaker
Optional Customer-supplied Batteries
_
+
12 Volt
Battery_
+
12 Volt
BatteryPBTC
Cable
Power Failure
Telephone (PFT)
Central Office/
Centrex/PBXLoop Start, DID, Tie 
or ISDN BRI Lines
(see Note below)
Tie, DID, and 
CO Lines
DKAdmin PC (TTY Port)
Door Lock or BGM 
Mute Control Relay
Alarm Relay SensorNight Bell or MOH 
(Control Relays)
SMDR Printer (SMDR Port)SMDI or DKAdmin PC
SMDI or SMDR Call 
Accounting Device
PIOU Page Zone 
Relay Control
Note External Protectors (not shown) must be used 
with each RDDU DID or Tie line. TDDU DID 
lines have built-in protectors.
PIOUS
or PIOU
KCDU2 (2/4)
RSSU
TTY
Port only
Peripheral
Interface 
PCBPDKU2 (8)
PEKU (8)
PESU (4/2)
PSTU or
RSTU2 (8) Electronic
Electronic/
Standard
RDSU
(4/2+2)
Digital/
StandardStandard
Telephone
Digital/
Standard
IMDU
(Modem)
Stratagy
DK
Page Zone 4Page Zone 1Modem
Personal Computer FaxStandard Telephone
25-pair Amphenol Connector
4227
Station PCBs
RCOS (4)
RBSU (2 BRI)
115 ± 10VAC (15 AMP)
50/60 Hz
BRI U
TNT1 6 max.
TA or TE-1 BRI (S/T) S
RJ45 Modular S
Base Station 1
Handsets
Base Station 2 Strata AirLink Base Station
Interface Adapter (BSIA)
RWIU (16) Digital 
Wireless 
Telephone
Strata AirLink Wireless
Base Stations (4)
Handsets