US Robotics COURIER Manual de usuario descargar pdf (Pagina 286)

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101

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.

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.

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