NEC Xen Master System Hardware Manual page 268

NEC Australia Pty Ltd
Abbreviations
A - 250
Integrated Services Digital Network
ISDN
An international plan to migrate the public switched network to the universal
implementation of standard digital technology.
Least Cost Routing
LCR A feature that automatically chooses the lowest cost phone line to the
destination.
Off-Premise Extension
A telephone that is located in a different office or building from the mail
OPX
phone system. The OPX is connected by a dedicated telephone line. This
extension has all abilities of the mail phone system.
Primary Rate Interface
ISDN subscriber interface. PRI has 30 bearer B-channels at 64 Kbps per
second and a D-channel at 64 Kbps per second. The bearer B-channels are
provided for PCM voice, video conferencing, group 4 facsimile machines
and other similar types of transmissions. The data D-channel is used to
PRI
bring in information about incoming calls and take out information about
outgoing calls. PRI can also be used to access slow-speed data networks
such as videotex and packet switched networks.
There are two PRI standards:
Serial Line Internet Protocol
An Internet protocol is used to run IP over serial lines such as telephone
SLIP
circuits. IP is the Internet Protocol; the most important of all protocols on
which the Internet is based. This protocol allows a packet to traverse
multiple networks before it reaches its final destination.
Station Message Detail Recording
SMDR
A feature that collects and records information on outgoing calls by station.
Service Profile Identifier
IDSN service is ordered with certain parameters. The SPID is an eight to 12
digit number that uniquely identifies the service ordered. The phone
company assigns an SPID for every phone number. Each ISDN BRI line
usually has two phone numbers.
SPID
The SPID is a label identifier that points to a particular location on the
telephone company central office memory that stores the details of the ISDN
services ordered. This number is necessary for the operation of the ISDN
phone, fax, or PC software. Without this number, ISDN services cannot be
accessed.
Voice over Internet Protocol
The ability to carry normal telephone-style voice over an IP-based internet
with POTS-like functionality and voice quality.
The Public Switched Telephone Network (PSTN) connects to the LAN IP
VoIP
network through a VoIP gateway. Digitised speech is transported through IP
packets and can include real-time conversation or voice mail. The IP
network can be public or private, and voice transport can be phone-to-
phone, computer-to-phone or computer-to-computer.
Xen Master & Xen Axis
Definition
U Interface – 2 wire
S/T Interface – 4 wire
Glossary of Abbreviations