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INSTALLATION-INTRODUCTION
SECTION 100-816-201
MARCH 1993
1-2
CODECs: Coder/Decoders—Semiconductors that
allow the system to process analog-to-digital
and digital-to-analog conversions.
DDCB: Digital Door Phone/Lock Control Unit—A
peripheral hardware unit that can be connected
to designated digital telephone circuits/ports.
The DDCB has three interfaces, two of which
are dedicated to door phones (MDFB), and one
that can be connected to a MDFB or a door lock.
DISA: Direct Inward System Access—A feature
available for CO lines that allows an outside
party to access a STRATA system’s internal
stations or outgoing CO lines without going
through an operator or automated attendant. An
optional security code and/or account codes
may be set to prevent unauthorized access to
outgoing CO lines for through system calling.
DK: Digital Key.
DKSU8: Key Service Unit (STRATA DK8 only)—
The standard key service unit which includes
the system's motherboard, power supply, two
CO line circuits, four digital telephone circuits,
relay service, and interface for Music-on-hold
(MOH)/Background Music (BGM) and External
Page.
DKSUB16: Base Key Service Unit (STRATA DK16
only)—The standard key service unit which in-
cludes the system's motherboard, power sup-
ply, four CO line circuits, eight digital telephone
circuits, relay service, and interface for Music-
on-hold (MOH)/Background Music (BGM) and
External Page.
DKSUE16: Expansion Key Service Unit (STRATA
DK16 only)—The optional key service unit which
has four universal slots that can support CO line,
station, and external option printed circuit boards
that are compatible with the larger STRATA DK
systems (DK24/DK56/DK96).
DSS: Direct Station Selection Console (STRATA
DK16 only)—A console designed to facilitate
the processing of a heavy load of incoming calls.
There are two types of DSS consoles: the DDSS
console and the HDSS console. The chief differ-
ence between them is that the DDSS console
can be connected to designated digital tele-
phone circuits, while the HDSS console can
only be connected to designated electronic tele-
phone circuits.
DTMF: Dual-tone Multi-frequency—Push-button
dialing.
DVSU: Off-hook Call Announce Upgrade—A sub-
assembly that allows a digital telephone to re-
ceive Off-hook Call Announce.
EOCU: Off-hook Call Announce Upgrade (STRATA
DK16 only)—An optional subassembly to the
Electronic Telephone Interface Unit PCB (PEKU)
or Standard/Electronic Telephone Interface Unit
(PESU) that provides support for electronic tele-
phones that must receive Off-hook Call An-
nounce. Electronic telephones that must re-
ceive Off-hook Call Announce must also have
an HVSU2 subassembly or the combined HVSU/
HVSI subassemblies.
FCC: Federal Communication Commission—The
telecommunication industry’s federal regulatory
agency. All Toshiba hardware is FCC listed or
approved.
HESB: External Speaker Box—A speaker/ampli-
fier that can be configured with the system and
telephones to provide a variety of functions.
HESC-65A: A cable that connects an HHEU-
equipped digital telephone or electronic tele-
phone to an HESB for a Loud Ringing Bell .
HHEU: Loud Ringing Bell/Headset Jack Interface
Upgrade—A small subassembly for use inside a
digital telephone or a 6500-series electronic
telephone that allows a speaker (HESB) and/or
a headset to be installed with the station.
HVSU2: Off-hook Call Announce Upgrade—A
subassembly that enables an electronic tele-
phone to receive Off-hook Call Announce.