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Glossary
LSI ~ PEMU
Strata DK Programming 5/00 GL-5
Glossary
LSI Large Scale Integration—Related to circuit design technology. Strata DK system 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.
NDTU Toshiba 30-foot cable that connects the RDTU to the KSU.
NT-1 Used in ISDN. Network Termination device that powers a U-interface ISDN line and enables
multiple S/T ISDN devices to connect to it. The NT-1 must be
UL-listed (U.S.) or CSA-certified (Canada).
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 PCB (an older version of RCOU) that provides the
system with four loop start CO lines. Supports Caller ID when used with RCIU/RCIS 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-DIs 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 Replaced by RPCI-DI
.
PDIU-DS Stand-alone Data Interface Unit—Used for modem pooling, printer sharing, and accessing
host/mainframe computer.
PDKU2 Digital Telephone Interface Unit—An optional 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 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 PCB (an older version of REMU) that provides the system
with support for four E & M Type I tie lines. The PEMU is also used with older Strata systems.
Term Definition