Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Glossary and Abbreviations
GL-28
PTT
Postal Telephone and Telegraph
public network
The network that can be openly accessed by all customers for local and long-distance calling.
pulse-code modulation (PCM)
An extension of pulse-amplitude modulation (PAM) in which carrier-signal pulses modulated by an
analog signal, such as speech, are quantized and encoded to a digital, usually binary, format.
Q
QPPCN
Quality Protection Plan Change Notice
QSIG
QSIG provides compliance to the International Organization for Standardization (ISO) ISDN-PRI
private-networking specifications. QSIG is defined by ISO as the worldwide standard for private
networks.
QSIG is the generic name for a family of signaling protocols. The Q-reference point or interface is
the logical point where signaling is passed between two peer entities in a private network. QSIG
signaling can provide feature transparency in a single-vendor or multi-vendor environment.
quadrant
A group of six contiguous DS0s in fixed locations on an ISDN-PRI facility. Note that this term comes
from T1 terminology (one-fourth of a T1), but there are five quadrants on an E1 ISDN-PRI facility
(30B + D).
queue
An ordered sequence of calls waiting to be processed.
queuing
The process of holding calls in order of their arrival to await connection to an attendant, to an
answering group, or to an idle trunk. Calls are automatically connected in first-in, first-out sequence.
R
RBS
Robbed-bit signaling
recall dial tone
Tones signalling that the system has completed a function (such as holding a call) and is ready to
accept dialing.
recorded telephone dictation ready tone
A tone that indicates a dictation machine is connected to the telephone.
redirection criteria
Information administered for each telephone’s coverage path that determines when an incoming
call is redirected to coverage.