3Com ISDN Modem manual Firmware, Kbps, Layer, Multilink PPP

GLOSSARY 3

Firmware

Firmware is the code that resides in the 3C882 ISDN modem and controls its behavior. It differs from software in the form of programs that run on your computer.

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. Two types of lines provide access to ISDN: BRI and PRI.

ISDN Call Logging

ISDN Call Logging displays the five latest incoming and outgoing numbers over the data and analog ports. To use this feature, your ISDN line must support Caller ID.

ISDN Call Waiting

ISDN Call Waiting is a supplementary voice feature that allows you to place a voice call on hold while you answer an incoming voice call. ISDN Call Waiting requires Additional Call Offering (ACO) provisioned on your ISDN line.

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 1 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

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