MCK pbxgateway Administrator's Manual page 233

Glossary
I
ISDN
Integrated Services Digital Network.
BRI, which is 144,000 bps and designed for the desktop, and PRI, which
is 1,544,000 bps and designed for telephone switches. BRI uses four
unshielded normal telephone wires (two twisted pairs) to deliver two
"Bearer" (B channel) of 64K bps each and one "data" (D channel) of 16K
bps.
IP
Internet Protocol. The most important protocol on which the Internet is
based. The IP Protocol is a standard describing software that keeps track
of the internetwork addresses for different nodes, routes outgoing
messages, and recognizes incoming messages.
IP Address
A 32-bit address, used in IP routing. Basically, this address identifies a
device within a network using a sequence of numbers.
L
LAN
Local Area Network. A short distance data communications network used
to link computers and peripheral devices (such as printers).
LED
Light-emitting diode. A semiconductor diode which emits light when a
current is passed through it, indicating that the power is on.
ISDN comes in two basic flavors-
Issue 2.1 December 1999
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