Reference Guide for the Model RT210/RT211 ISDN Routers
Glossary 3
NT1 Network
Termination 1 Termination device that connects the user’s equipment to the ISDN
network. Converts the local equipment’s four-wire S/T interface to the
two-wire telephone company interface. The NT1 is provided by the
telephone company in most of the world, but by the user in North
America. Referred to in some areas as a DSU.
numbered links See unnumbered links.
PAP See Password Authentication Protocol.
POTS See Plain Old Telephone Service.
PPP See Point-to-Point Protocol.
PSTN Public Switched Telephone Network.
Password Authentication
Protocol A method of enabling security on PPP links. When the link is
established, a password is sent by the caller. See Challenge Handshake
Authentication Protocol.
Plain Old Telephone Service The standard analog phone system.
Point-to-Point Protocol Protocol allowing a computer using TCP/IP to connect directly to the
Internet.
RIP See Routing Information Protocol.
Routing Information Protocol A protocol in which routers periodically exchange information with
each other so that they can determine minimum distance paths
between sources and destinations.
SPIDs See Service Profile Identifiers.
S/T Interface The four-wire ISDN interface or reference point at the user or local
side of the NT1. See U interface.
NGRRT210.BK Page 3 Friday, October 17, 1997 2:37 PM