Multi-Tech Systems MT128ZLX-ST Uživatelský manuál stáhnout pdf (Strana 253)

MultiMobile MT128ZLX User Guide Appendix F: ISDN Glossary

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ISDN Glossary

2B+D

a Basic Rate Interface ISDN line consisting of two B channels and one D channel

A-Law

Voice encoding scheme used in Europe and widely throughout the world outside of Japan and North America.

AT@T



 “5ESS”

Central office telephone switching system equipment manufactured by AT&T

B-Channel

One 64 kilobit-per-second digital data channel of an ISDN line

Bandwidth Allocation Control Protocol

A set of rules that govern bandwidth over PPP dynamic multilink connections

Basic Rate Interface (BRI)

An ISDN service that provides for 3 digital channels: 2 B-channels and 1 D-channel

Bridge

A device used to connect and forward information betweenn two or more network segments. Also known as a data

link relay or a level 2 relay. A bridge is simpler and less expensive than a router, but the information that it can carry

is limited.

Central Office (CO)

The local telephone facility that provides telephone service in your area

CENTREX

A virtual PBX for a set of extensions provided by the central office.

Customer Access line charge (CALC)

Also known as End User Common Line Charge (EUCL) or Subscriber Line Charge (SLC). This is a federal tariff

charged for installing your ISDN line. The amount

Of this tariff will vary from state to state or province to province.

Demarc

Or “Demarcation point” is the point where the telephone companies wiring stops and your wiring begins. In other

words the telephone company is responsible for wiring before the Demarc and your responsibility is anything after

that point.

D-channel

One of the three channels that make up a BRI line. The D-channel is rated for 16 kilobits-per-second and is used to

carry signaling information and low speed packet data.

DMS

Another ISDN switch type, this switch type is manufactured by Northern Telcom (now Nortel).

EWSD

Another ISDN switch type, this switch type is manufactured by Siemens Stromberg-Carlson

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