General; Technology; Maintenance And Programming - Toshiba Strata DK8 General Description Manual

S T R A T A D K 8 & D K 1 6
G E N E R A L D E S C R I P T I O N
1 G E N E R A L
The STRATA DK8 and STRATA DK16 are private
telephone systems that are tailor-made for small busi-
ness applications. Each employs state-of-the-art tech-
nology to provide its users with an efficient, easy-to-
use, feature-rich telephone system.
The systems easily connect to outside public tele-
phone lines (central office lines), and all of the tele-
phones (stations) tied to each system can have direct
access to each other as well as to the public network.
Designed with the knowledge that user needs typi-
cally evolve, the STRATA DK8 and DK16 can be
upgraded with additional circuit boards to add more
features and and/or capacities. Customers are not
tied to one configuration; they can start at a standard
configuration and then add to their system as their
needs grow and change.
Furthermore, many of the telephones and peripher-
als supported by STRATA DK8 and DK16 are also
compatible with other STRATA systems. This compat-
ibility saves customers money when they migrate
from the smaller STRATA DK8 system to a STRATA
DK16, or when they migrate from the STRATA DK8
and DK16 to a larger STRATA DK system.
Utilizing specially designed digital or electronic
telephones, solid-state electronics within the key ser-
vice unit translate signals from the station push-button
dial pad into either Dual-tone Multi-frequency (DTMF)
or rotary-dial signals, as required by the central office.
All telephones come equipped with voice announce
speakers. Speakerphones and liquid crystal display
telephones are also available.
A large number of widely-used and sophisticated
features are available to STRATA telephone users.
Everyday features such as Call Transfer, Call For-
warding, Call Holding, and Call Pickup are executed
with just the push of a button or the entry of a brief
access code. More sophisticated feature operations
are easily accomplished with the aid of optional dis-
plays built into telephones.
In addition to telephones, a number of other useful
peripherals can be connected to the
ing door phones for visitor screening; a music source
for Music-on-hold; a speaker for Background Music
and Paging; and a voice mail device—like the Toshiba
VP Voice Processing System— for voice mail applica-
tions (see Figure 1).
The STRATA DK8 and STRATA DK16 utilize the
advanced technologies noted below:
ISDN-like Architecture: Toshiba digital telephones
connect to the system with one-pair cabling, which
uses a 2B+D ISDN-like digital link that can transmit
and receive simultaneous voice and data along
with control information.
Pulse Code Modulation: Digital switching talkpaths
allow all central office (CO) and intercom lines to
be accessed simultaneously. Analog-to-digital and
digital-to-analog conversion is accomplished by
CODECs (coder plus decoder) on station and CO
line printed circuit boards (PCBs).
Stored Program Control: The system uses a 16-bit
microprocessor for stored program control. System
operating software is stored on 1 megabyte of read
only memory (ROM), and individual configuration
and custom programming is stored on 128 kilo-
bytes of random access memory (RAM) for DK16
and 64K of RAM for DK8. A lithium battery with a
life span of at least six years will preserve RAM in
the case of a power failure.
Microprocessors: The main microprocessor of the
system is a 16-bit 68000-type that operates at a
clock speed of 8 megahertz (MHz). In addition,
some printed circuit boards employ 8-bit,
TMP90C840-type local microprocessors that run at
10 MHz. This distributed microprocessing architec-
ture is used throughout the system.
Custom Electronic Circuitry: Large scale integration
(LSI) technology enables STRATA DK8 and DK16
circuit design to be simple and efficient. Gate
arrays using very large scale integration save vast
amounts of space by utilizing the latest technology.
More circuitry fits onto smaller PCBs for a more
compact system. Widespread use of CMOS cir-
cuits minimize system power requirements.
system, includ-

MAINTENANCE AND PROGRAMMING

Maintaining and troubleshooting STRATA DK8 and
DK16 is easy because of its modular architecture.
A U G U S T 1 9 9 3

TECHNOLOGY

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