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STRATA DK
GENERAL DESCRIPTION
DECEMBER 1990
GLOSSARY OF ACRONYMS
"BPS
CO
CODECs
CRCU
CRCU-4
CRCU-8
DISA
DISC
DK
DPFT
DSS
DDSSt
EOCU
FCC
HDCB
HESB
HHEU
HVSI
HVSU
Bits per second-baud rate.
Central off ice.
Coder/decoder semiconductor.
DTMF receiver subassembly-
optional DTMF receiver upgrade for
the PCTU2/3 or PCTUS.
4-circuit DTMF receiver subassem-
bly.
8-circuit DTMF receiver subassem-
bly.
Direct inward system access.
Direct inward station calling.
Digital key.
Power failure transfer unit-emer-
gency backup unit.
Direct station selection.
Digital direct station selection.
Off-hook call announce subassem-
bly-optional PCB upgrade to PEKU
or PESU for OCA (not needed on
PDKU).
Federal Communication Commis-
sion.
Door phone control unit-peripheral
to support door phone or door lock
option.
External speaker unit-speaker box
with built-in amplifier.
A subassembly to upgrade an elec-
tronic telephone with a headset
and/or loud ringing bell.
A subassembly to upgrade
tronic telephone with OCA.
A subassembly to upgrade
tronic telephone with OCA.
an elec-
an elec-
IMDU
KSU
LCD
LED
LSI
MDF
MDFB
OCA
PBX
PCB
PCM
PCOU
PCTU
PDKlJt
PDIU-Dlt
Remote mamtenance modem sub-
assembly.
Key service unit.
Liquid crystal display.
Light emitting diode-busy lamp
indication.
Large scale integration.
Main distribution frame.
Door phone unit.
Off-hook call announce.
Private branch exchange.
Printed circuit board.
Pulse code modulation.
CO line unit-PCB option that pro-
vides the system with four CO lines.
Common control unit-the system’s
controller PCB (there are three ver-
sions,
PCTU2, PCTU3, and
PCTUS).
Digital telephone interface unit-sta-
tion port PCB-supports digital tele-
phones and digital interface units
(PDIU-Dls and PDIU-DSs). It can
also support a DDSS console.
Integrated data interface
unit-integrated into the base of a
digital telephone, it is used for
transmitting and receiving data
between terminals/personal
computers and devices connected to
other PDIU-Dls or to modems,
printers, and computers connected
to PDIU-DSs. The PDIU-DI also
provides personal computer access
to outside dial-up data services
and/or bulletin boards via modems.
,
4
t Requires Release 3 software.
-48-