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370 Glossary
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pulse/tone dialing
Pulse is the traditional method of dialing used by rotary-dial or push-button single-line
telephones. Tone dialing allows telephones to communicate with other devices such as
answering machines. You require tone dialing to access the features that PBX systems can
provide or to use another system remotely.
Quality of Service (QoS)
On the Internet and in other networks, QoS refers to guaranteed throughput level. QoS
allows a server to measure, improve and, to some level, guarantee the transmission rates,
error rates, and other data transmission characteristics. QoS is critical for the continuous
and real-time transmission of video and multimedia information.
Q reference point signalling (QSIG)
QSIG is an ETSI standard signalling for multi-vendor peer-to-peer communications
between PBXs and/or central offices. This is an International standard and not available in
North America.
Random Access Memory (RAM)
Computer memory that stores data temporarily. RAM stores the data used by the
microprocessor because it executes instructions. The contents of RAM are erased when
you restart or turn off the Business Communications Manager.
RAID
Redundant array of independent disks. A disk subsystem used to increase
performance and/or provide fault tolerance. RAID is a set of two or more ordinary
hard disks and a specialized disk controller that contains the RAID functionality.
Remote access
The ability to dial into an Business Communications Manager system from outside the
system and use selected features. The Class of Service determines which lines, features,
and dialing capabilities are available.
Restriction filter
Restriction filters prevent selected telephone numbers or feature codes from being dialed.
Restriction filters can be applied to lines, sets, specific lines on a set, and to Class of
Service passwords.
Read Only Memory (ROM)
Memory that stores data permanently. ROM contains instructions that the Business
Communications Manager needs to operate. The instructions stored in ROM are used by
the Business Communications Manager each time it is turned on or restarted.
Router
A device that forwards traffic between networks, based on network layer information and
routing tables. A router decides which path network traffic follows using routing protocols
to gain information about the network and algorithms to choose the best route based on a
routing matrix.