Toshiba Strata DK 280 Installation Manual page 861

maintenance terminal or 280Admin/280Backup
personal computer.
LCD: Liquid Crystal Display-The optional display on
digital and electronic telephones that displays
calling information.
LCR: Least Cost Routing.
LDI: Long Distance Information.
LED: Light Emitting Diode-Status indicators located
on printed circuit boards (PCBs), digital
telephones, and electronic telephones.
LSI: Large Scale Integration-Related to circuit design
technology. Strata DK280 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.
MOH: Music on Hold-Customer-supplied music or
announcements can be sent to parties on-hold on
CO lines or the intercom.
OCA: Off-hook Call Announce. There are two types:
Handset OCA and Speaker OCA.
OPS: Off-premises Station.
PBTC: A Toshiba-supplied cable used to connect
customer-supplied batteries to a cabinet power
supply in a one- or two-cabinet system for
emergency reserve power for the entire system.
PBX: Private Branch Exchange-Industry-standard
term which refers to a telephone switch, usually
on-premises, which serves an individual company,
and is connected to a public telephone exchange
through the Central Office (CO).
PCB: Printed Circuit Board.
PCM: Pulse Code Modulation-A widely-used form of
digital telephone switching.
PCOU: CO Line Interface Unit-An optional printed
circuit board (PCB) that provides the system with
four loop start CO lines. Supports Caller ID when
used with RCIWRCIS circuits.
PDIU-DI2: Integrated Data Interface Unit-Replaces
the normal digital telephone base so that the
telephone can be used for the transmission and
reception of data between a terminal/personal
computer connected to the telephone and devices
connected to other PDIU-Dls or to modems,
printers, and computers which are in turn
connected to PDIU-DSs. The PDIU-DI is also
used to provide personal computer auto dialing of
voice calls without a modem; and, access to
outside dial-up data services and/or bulletin
boards via modem pooling.
Note:
PDIUDl2 is replaced with RPCI-DI.
PDIU-DS: Stand-alone Data Interface Unit-Used for
modem pooling, printer sharing, and accessing
host/mainframe computer.
PDKUS: Digital Telephone Interface Unit-An optional
printed circuit board (PCB) that provides the
system with eight digital telephone circuits. In
addition to digital telephones, the PDKU can
support data interface units (stand-alone and
integrated), a digital DSS console (DDSS), RPCI,
ADM, and a digital door phone/lock control unit
(DDCB).
[PDN]: Primary Directory Number.
PEKU: Electronic Telephone Interface Unit-An
optional printed circuit board (PCB) that provides
the system with eight electronic telephone circuits,
which can support electronic telephones, a
Background Music source, a door phone/lock
control unit (HDCB), an electronic DSS console
(HDSS), and amplifiers for two CO-line conference
calls. The PEKU is also used with older Strata
systems.
PEMU: E & M Tie Line Unit-An optional printed
circuit board (PCB) that provides the system with
support for four E & M Type I tie lines. The PEMU
is also used with older Strata systems.
PEPU: External Page Interface Unit-An optional
printed circuit board (PCB) that provides support
and/or circuit interface mainly for optional
hardware peripherals and upgrades associated
with external paging functions.
PESU: Standard/Electronic Telephone Interface
Unit-An optional printed circuit board (PCB) that
provides the system with a combination of two
standard and four electronic telephone circuits.
The standard telephone circuits can support
standard telephones and optional hardware
peripherals, such as voice mail devices and Fax
machines. Except for the electronic DSS console,
the PESU electronic telephone circuits can
support the same stations and peripherals that the
January 1996
CL-3