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Glossary
K4RCU3 ~ OCA
Strata DK Programming 5/99 GL-5
Glossary
K4RCU3 Dual-Tone Multi-Frequency (DTMF) Receiver/ABR Tone Detector Unit—An
optional PCB installed on the TMAU motherboard. The K4RCU3A must be
installed to recognize Dual-Tone Multi-Frequency (DTMF) tones generated by a
standard telephone (or any other device connected to a standard telephone circuit)
and it is required for Direct Inward System Access (DISA) and DID. The
K4RCU3A circuits are also used to detect busy tone for the Automatic Busy Redial
(ABR) feature and must be installed to allow ABR to operate.
KCDU CO Line/Digital Telephone Interface Unit (DK40i)—The KCDU has two loop start
CO line circuits and four digital telephone circuits. The KCDU digital telephone
circuits can support all but one of the devices supported by either the PDKU or
Base Unit integrated digital telephone circuits: digital telephones, PDIU-DIs/PDIU-
D12s, PDIU-DSs, ADMs, DDCBs and RPCIs.
KKYS Modular add-on key or integrated circuit that installs onto the K4RCU3 to add the
auto attendant feature to the DK40i.
KSTU2 The optional PCB provides four standard telephone circuits and it can only be
installed in the base unit. The KSTU2 supports the two-wire devices such as
standard telephones, Auto Attendant devices, voice mail machines, and facsimile
machines. The KSTU2 can also support an alternate Background Music (BGM)
source on circuit four.
LATA Local Access and Transport Area.
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 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.
Term Definition