3Com ISDN Modem, User Manual

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2 G
LOSSARY
CHAP
Challenge Handshake Authentication Protocol. CHAP is one
of two PPP authentication protocols; 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.
COM port
The communications port (also referred to as a serial port).
The 3C882 ISDN modem communications port allows a
maximum baud rate of 230.4 Kbps. Note that most computer
COM ports only allow a maximum of 115.2 Kbps. However,
accelerator cards can be purchased to increase the
computer’s COM port rate to 230.4 Kbps.
Compression
Compression is a method of reducing the size of data
packets without losing any information. The 3C882 ISDN
modem automatically compresses data for PPP calls to
improve data transfer times using the hi/fn

compression
method.
D channel
The signaling channel on an ISDN line used to carry
messages between the 3C882 ISDN 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.
Default
Value set at the factory.