3Com 3C892 manual Glossary, Channel to call

GLOSSARY

B channel Bearer channel. In ISDN communications, a B channel transmits data or voice traffic at a rate of up to 64 Kbps.

BRI Basic Rate Interface. A BRI line is one of two access methods to the ISDN; PRI is the other. Each BRI consists of two 64 Kbps B channels and one 16 Kbps

D channel for each ISDN line.

BACP/BAP Bandwidth Allocation Control Protocol (BACP) and Bandwidth Allocation Protocol (BAP) are used in conjunction with the Multilink PPP feature. When Multilink PPP is negotiated, the BACP negotiates with the peer equipment to determine whether the peer supports BAP. If the peer supports BAP and agrees to use BAP, then the BAP negotiates the addition and removal of the second B channel with the peer equipment based on a user-defined threshold. A key advantage of BACP/BAP is that it provides a higher probability of establishing a Multilink PPP call during high traffic conditions by providing a specific telephone number for the second

B channel to call.

CHAP Challenge Handshake Authentication Protocol. CHAP is one of two PPP authentication protocols supported by the ISDN LAN Modem; PAP is the other. An authentication protocol requests information to verify a valid user. CHAP is a stronger authentication method because it uses encryption and may repeatedly request verification of the identity of the user any time after link establishment.

compression Compression is a method of reducing the size of data packets without losing any information. The ISDN modem automatically compresses data for PPP calls to improve data transfer times using a compression method called Hi/fn LZS.

D channel The signaling channel on an ISDN line used to carry messages between the ISDN LAN Modem and the public switch.

DBA Dynamic Bandwidth Allocation. DBA is a method of reallocating bandwidth (such as a B channel) automatically. DBA allows you to place or receive a voice call while a Multilink PPP call is active.

DHCP Dynamic Host Configuration Protocol. DHCP allows a server to automatically assign an IP address to a newly-attached computer on an IP network.

default Value set at the factory.

domain A domain is a unique name which refers to a single entity on the Internet and is used for organizational purposes.

DNS Domain Name Server. DNS translates the common alphabetic name into the numeric IP address. For example, floyds_PC is translated to 192.168.1.2.