NEC Electra Elite 192, Hardware Manual

Page: 367 / 369

Electra Elite Issue 6
System Hardware Manual A - 3
PRI Primary Rate Interface
ISDN subscriber interface. PRI has 23 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 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.
PRI has two standards:
U Interface for 2-wire
T Interface for 4-wire
SLIP Serial Line Internet Protocol
An Internet protocol is used to run IP over serial lines such
as telephone 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.
SMDR Station Message Detail Recording
A feature that collects and records information on outgoing
calls by station.
SPID Service Profile Identifier
ISDN service is ordered with certain parameters. The SPID
is an 8- 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.
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.
VoIP Voice over Internet Protocol
The ability to carry normal telephone-style voice over an IP-
based internet with POTS-like functionality, reliability, and
voice quality.
The Public Switched Telephone Network (PSTN) connects
to the LAN IP network through a VoIP gateway. Digitized
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.
Abbreviations Definition