Toshiba STRATA DK24 Manual page 61

INSTALLATION-INTRODUCTION
SECTION 200-096-201
FEBRUARY1991
MDFB:
Door Phone Box-A peripheral two-way
speaker box option.
OCA:
Off-hook Call Announce.
PBX:
Private Branch Exchange-lndustry-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 CO.
PCB:
Printed Circuit Board.
PCM:
Pulse Code Modulation-A widely used
form of digital telephone switching.
PCOU:
CO Line Interface Unit-An optional PCB
that provides the system with four CO lines.
PCOUP:
The PCOU2 is a direct replacement for
the PCOU. Their fit/form/function is identical;
however, for manufacturing reasons, the PCOU
was phased out in favor of the PCOU2.
PCTU
1, 2,
or
3: Common Control Unit-The
system's controller PCB. It supports up to 14
universal slots, 96 station ports, and 36 CO
lines. The PCTUl supports
Release
1 software;
the PCTU2 supports
Release
2 software; and
the PCTU3 supports
Release
3 software. All
three PCTU versions are compatible with all DK
systems-DK24, DK56, and DK96.
PCTUS:
Common Control Unit-The controller
PCB for the DK24. It supports up to six universal
slots, 24 station ports and 16 CO lines. It also
supports
Release
2 software. The PCTUS is
compatible with DK24 only.
PDIU-DI (Release
3): Integrated Data Interface
Unit-Integrated into the base of a digital tele-
phone, it is used for transmitting and receiving
data between terminals/personal computers and
devices connected to other PDIU-Dls 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.
PDIU-DS (Release
3): Stand-alone Data Interface
Unit-Used for modem pooling, printer sharing,
and access to a host/mainframe computer.
PDKU (Release
3): Digital Telephone Interface
Unit-An optional PCB that provides thesystem
with eight digital telephone circuits. In addition
to digital telephones, the PDKU can support
data interface units (stand-alone and integrated)
and a digital DSS console.
PEKU:
Electronic Telephone Interface Unit-An
optional PCB that provides the system with
eight electronic telephone circuits.
PEMU:
E & M TIE Line Unit-An optional PCB that
provides the system with support for four E & M
Type I TIE lines.
PEPU:
External Page Interface Unit-An optional
PCB (essentially a reduced model of the PIOU)
that provides support and/or circuit interface for
optional hardware peripherals and upgrades
associated with external paging functions.
PESU (Release 2 and higher):
Standard/Elec-
tronic Interface PCB-An optional PCB that pro-
vides the system with a combination of two
standard and four electronic telephone circuits.
The standard telephone circuits may also be
connected to optional hardware peripherals, such
as voice mail, auto attendant, and fax machines.
PIOU:
Option Interface Unit-An optional PCB
that provides support and/or circuit interface for
optional hardware peripherals and upgrades.
PIOUS:
The same as the PIOU, with some excep-
tions; most notably, the PIOUS has one external
paging interface zone, while the PIOU has four.
NOTE:
Each system will support on/y one of the
following PCBs: PIOU, PlOUS or
PEW.
Port:
A term used to identify a station circuit
location. Each station and TIE line hardware
circuit is assigned to a port number in system
software.
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