Toshiba STRATA DK24 Manual page 60

INSTALLATION-INTRODUCTION
SECTION 200-096-201
FEBRUARY1991
CRCU-8: An optional upgrade to the system's
controller PCB (PCTU or PCTUS) that provides
an 8-circuit DTMF receiver for system DISA CO
lines, E & M TIE lines, and standard telephones.
I
DDSS (Release3): Digital Direct Station Selection
Console-A console to facilitate processing a
heavy load of incoming calls. The DDSS console
is usually associated with adedicated attendant's
telephone.
DISA (Release 2 and higher): Direct Inward
System Access-A feature available for CO
lines that allows an outside party to access a
system's internal stations or outgoing CO lines*
without going through an operator or automated
attendant. An optional security code may be set
to prevent unauthorized access to outgoing CO
lines for through system calling.
DK: Digital Key.
DPFT: Power Failure/Emergency Transfer Unit-
An optional backup unit that provides emer-
gency service during power failures.
DSS: Direct Station Selection Console-A con-
sole to facilitate processing a heavy load of
incoming calls. The DSS console is always
associated with a dedicated attendant elec-
tronic telephone station.
I
DVSU (Release 3): A subassembly that equips a
digital telephone with off-hook call announce
capability.
EOCU: Off-hook Call Announce Subassembly-
An optional upgrade to the Electronic Tele-
phone Interface Unit PCB (PEKU) that provides
supportforstations with off-hookcall announce.
FCC: Federal Communication Commission-The
telecommunication industry's federal regulatory
agency. All Toshiba hardware is FCC listed or
approved.
HDCB: Door Phone Control Box-A peripheral
hardware unit that supports optional door
phones.
HESB: External Speaker Box-A speaker/ampli-
fier that can be configured with the system to
provide a variety of functions.
.
. . .
,I:
HESC-65: A cable used to connect electronic
telephones (HHEU) to the HESB for the loud
ringing-bell option.
HESC-65A (Release 3): A cable that connects an
HHEU-equipped digital or electronic telephone
to an HESB for the loud ringing bell option.
I
HHEU: Loud Ringing Bell/Headset Jack Interface
Upgrade Unit-A small PCB upgrade for use
inside a digital telephone or a 6500-series elec- I
tronic telephone that allows a speaker (HESB)
and/or a headset to be installed with the station.
HVSI:
The second of two subassemblies that
comprise the upgrade assembly that equips an
electronic telephone with Off-hook Call An-
nounce capability.
HVSU: One of two subassemblies that comprise
the upgrade assembly that equips an electronic
telephone with Off-hook Call Announce capabil-
ity.
IMDU: Remote Maintenance Modem Interface
Unit-A subassembly installed on a PIOU or
PIOUS PCB that allows the system to be con-
nected with a remote maintenance/administra-
tion 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. I
LED: Light Emitting Diode-The indicators lo-
cated on printed circuit boards, digital telephones, I
and electronic telephones.
LSI: Large Scale Integration-Related to circuit
design technology. STRATA DK printed circuit
boards use LSI circuit design.
MDF: Main Distribution Frame-The wiring frame
usually located in a phone closet.
*Release 2 software and higher
1-2