User`s manual

U.S. Robotics I-modem Command Reference
Glossary • Page G-28
modem
A device that transmits/receives computer data through a communications channel such as
radio or telephone lines. The Courier is a telephone channel modem that modulates, or
transforms, digital signals
from a computer into the analog form that can be carried suc-
cessfully on a phone line. It also demodulates signals received from the phone line back to
digital signals before passing them to the receiving computer.
multipoint
A circuit that is made up of three or more connected stations. Contrast with point-to-point.
N
National ISDN-1 (NI-1)
BellcoreÕs standard deÞnition of protocols and services for BRI and PRI lines. NI-1 allows
devices and switches to connect regardless of their manufacturers.
National ISDN-2 (NI-2)
BellcoreÕs standard deÞnition of protocols and services, mostly for PRI lines. NI-2 allows
devices and switches to connect regardless of their manufacturers.