3Com 3C882 manual Isdn, Layer

GLOSSARY 3

ISDN

Integrated Services Digital Network. ISDN provides a digital telephone service which allows both data and voice communication over the same telephone line and at significantly faster speeds than the traditional POTs service. There are two types of lines which provide access to ISDN, BRI and PRI.

Kbps

Kilobits per second. The rate at which data is transmitted between communication equipment such as ISDN modems.

Layer 1

In ISDN communications, the physical layer of communications between the communication equipment. If layer one is down, there is no ISDN connection between the devices. The status bar in the 3C882 ISDN modem Configuration screen indicates layer 1 status.

Multilink PPP

Multilink PPP is a protocol which provides a method for combining multiple PPP connections. With a BRI line, Multilink PPP aggregates the two 56 Kbps or 64 Kbps I SDN B channels, creating a virtual single digital connection of up to 128 Kbps.

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.