Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Glossary and Abbreviations
GL-23
Multifrequency Compelled (MFC) Release 2 (R2) signaling
A signal consisting of two frequency components, such that when a signal is transmitted from a
switch, another signal acknowledging the transmitted signal is received by the switch. R2
designates signaling used in the United States and in countries outside the United States.
multiplexer
A device used to combine a number of individual channels into a single common bit stream for
transmission.
multiplexing
A process whereby a transmission facility is divided into two or more channels, either by splitting
the frequency band into a number of narrower bands or by dividing the transmission channel into
successive time slots. See also time-division multiplexing (TDM)
.
multirate
The new N x DS0 service (see N x DS0).
MWL
Message-waiting lamp
N
N+1
Method of determining redundant backup requirements. Example: if four rectifier modules are
required for a DC-powered single-carrier cabinet, a fifth rectifier module is installed for backup.
NANP
North American Numbering Plan
narrowband
A circuit-switched call at a data rate up to and including 64 kbps.
native telephone support
A predefined telephone type exists in switch software, eliminating the need to alias the telephone
(that is, manually map call appearances and feature buttons onto some other natively supported
telephone type).
NAU
Network access unit
NCA/TSC
Noncall-associated/temporary-signaling connection
NCOSS
Network Control Operations Support Center
NEMA
National Electrical Manufacturer’s Association
NETCON
Network-control circuit pack
network-specific facility (NSF)
An information element in an ISDN-PRI message that specifies which public-network service is
used. NSF applies only when Call-by-Call Service Selection is used to access a public-network
service.