Instruction manual

Glossary
HDSS
Strata DK General Description 6/00 133
HDSS Electronic Direct Station Selection Console—A device that helps facilitate the processing of a
heavy load of incoming calls. The HDSS console connects only to designated electronic
telephone circuits, and is associated with electronic telephones.
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.
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.
ISDN Integrated Services Digital Network. ISDN service requires service subscription from a telco
with ISDN equipment. It allows digital information to be exchanged directly at each end of the
line, without the need to convert analog to digital signals. Connection speeds are faster and
audio quality is superior.
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.
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.
NFAS Non-facility Associated Signaling—provides the ability to create ISDN trunk groups beyond
the 23 channels available with a single Primary Rate Interface.
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.
PBX Private Branch Exchange—Industry-standard term which refers to a telephone switch,
usually on-premises, which serves an individual company, and is connected to a public
telephone exchange through the Central Office (CO).
PCB Printed Circuit Board.
[PDN] Primary Directory Number.
PF Power Failure.
[PhDN] Phantom Directory Number.
PRI Primary Rate Interface—A trunk interface to the ISDN network, which enables multiple use of
channels for DID, Tie, FX, WATS, 800, etc. It supports multiple services and dynamic channel
allocation. PRI is the larger ISDN interface (via the RPTU) with 23B+D transmission format.
Channels are 64-kbps. Also see BRI.
PSAP Public Safety Answering Point—Used for E911 calls.
RAM Random Access Memory—Refers to the type of system memory that holds individual system
configuration and feature programming. RAM is read/write memory, and can be easily
revised in programming.
Term Definition