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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 Local Microprocessors. Most PCBs and all
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 System Operating Software. System oper-
ating software is stored in Read Only Memory
(ROM), and is revised only by Toshiba software
engineers.
2.22 Configuration and Custom Programming.
Each STRATA DK system’s individual configura-
tion and custom programming is stored in Random
Access Memory (RAM). The content of system
RAM is user-developed and -programmed, based
on the system’s configuration and the user’s re-
quirements. System RAM is protected by a lithium
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-analog conversion is accomplished by CODEC
integrated circuits.
3 KEY SERVICE UNITS (KSU)
3.01 The STRATA DK KSUs are single, free-
standing cabinets that can be configured for either
wall or table-top mounting. One-inch rubber feet
on the base of the cabinet ensure that proper
clearance is maintained when the KSU is table-top
mounted. The KSU interior houses the printed
circuit board (PCB) shelves and the power supply.
3.02 External dimensions and approximate
weights for the DK24, DK56, and DK96 models are
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 The DK24 KSU interior has one shelf (Figure
2-2) with seven available PCB slots, labeled PCTU
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, and is secured with two combination slotted/
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
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