Toshiba Strata DK 24, Installation And Maintenance Manual

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INSTALLATION-INTRODUCTION
SECTION 400-096-201
SEPTEMBER 1992
Telephone Interface Unit (PEKU) or a Standard
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: Liquid Crystal Display—The display on digi-
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,
usually on-premises, which serves an individual
company, and is connected to a public tele-
phone exchange through the Central Office
(CO).
PCB: Printed Circuit Board.
PCM: Pulse Code Modulation—A widely-used form
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: Common Control Unit—The system’s con-
troller printed circuit board (PCB) that can sup-
port up to 14 universal slots, 96 station ports,
and 36 CO lines. There are four software versions
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
for the DK24 that can support up to six universal
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. The PDIU-DI is also used to provide
personal computer access to outside dial-up
data services and/or bulletin boards via modem
pooling.
NOTE:
The PDIU-DI and the PDIU-DI2 are identical,
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