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4 G
LOSSARY
National ISDN
An ISDN standard that enables consistency in ISDN service
features across different vendors’ equipment and switches for
North America.
Network terminator (NT1)
A device that terminates the ISDN line. The NT1 is built into
the 3C882 ISDN modem.
PAP
Password Authentication Protocol. PAP is one of two PPP
authentication protocols; CHAP is the other. An
authentication protocol requests information to verify a valid
user. PAP requests the user’s name and password for
verification.
POTS
Plain old telephone service.
PPP
Point-to-Point Protocol. PPP provides a standard method of
transmitting data through the Internet. PPP is used for
communication between a computer and an Internet service
provider.
PRI
Primary Rate Interface. A PRI line is one of two access
methods to the ISDN. In North America, each PRI consists of
twenty-three 64 Kbps B channels and one 64 Kbps
D channel.
QuickSelect
A built-in feature that automatically detects and uses the
protocol required for each digital call: V.120 or
Async-Sync PPP.
SPID
Service Profile Identifier. If required, this number is supplied
to you by the telephone company. Typically, if your ISDN line
has only one telephone number, a SPID is not required.