Toshiba Strata Dk14, Dk40i, Dk424 General Description Manual

Strata DK14
System Technology
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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...

Strata DK14
Maintenance and Programming
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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...

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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...

Strata DK40i
Peripherals
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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...

Strata DK40i
Base KSU Architecture
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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...

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

Strata DK40i
Base KSU Architecture
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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...

Strata DK40i
Expansion KSU Architecture
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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...

Strata DK40i
Typical Line Configurations
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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...

Strata DK40i
Functional Block Diagram
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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...