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Glossary
HESB ~ LED
GL-4 Strata
HESB External Speaker Box—A speaker/amplifier that can be configured with the system to
provide a variety of functions, such as a paging speaker and/or Background Music (BGM)
speaker.
HESC-65A A cable used to connect an HHEU-equipped digital telephone or an HHEU-equipped
electronic telephone to the external speaker box (HESB) for the Loud Ringing Bell feature.
HHEU Headset/Loud Ringing Bell Interface—Subassembly that fits inside a digital telephone or a
6500-series electronic telephone to allow a headset or an external speaker box (HESB) to be
connected to the telephone.
HPFB Optional Reserve Power Battery Charger (DK14)—One or two can be connected to the
power supply to maintain normal operation during a power failure.
HVSU2 Subassembly that fits into a 6500-series electronic telephone enabling it to receive Off-hook
Call Announce (OCA) calls. The telephone must be connected to an Electronic Telephone
Interface Unit (PEKU) or a Standard Telephone/Electronic Telephone Interface Unit (PESU)
equipped with an Off-hook Call Announce Subassembly (EOCU) to receive OCA, and must
have three-pair wiring.
IMDU Remote Maintenance Modem Subassembly—A subassembly installed on an Option
Interface Unit (PIOU or PIOUS) that allows the system to be connected with a remote
administration/maintenance terminal or DKi Admin/DKi Backup personal computer.
ISDN Integrated Services Digital Network.
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.
Term Definition