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GLOSSARY 2
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 Stac
compression
method. The following check modes are negotiable— None,
One Byte Sequence Number, and Extended. Extended is the
preferred choice. The degree of compression depends on
the type of file being transferred. For example, a text-only file
compresses better than a file with graphics.
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.
Firmware
Firmware is the code which resides in the 3C882 ISDN
modem and controls its behavior. It differs from software in
the form of programs that run on your computer.