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Advanced Configuration Parameter Default Values 5-3
Auto Answer
When Auto Answer is disabled (the default), a RING message
is delivered to the RS-232 port upon reception of an
incoming data call to the 3C882 ISDN modem. Enter the
command AT A to answer the incoming data call. A
CONNECT message is then delivered to the RS-232 port upon
successful connection.
If Auto Answer is enabled, the call is automatically answered
after the number of rings you specify, and a CONNECT
message, indicating the speed of the connection, is delivered
to the RS-232 port.
Compression
Compression is a method of reducing the size of data
without losing any information. The 3C882 ISDN modem
automatically compresses data 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.
Compression is enabled (default) and will automatically be
invoked unless you are running compression on your
computer. If you are running compression on your
computer, that compression method will be used instead of
3C882 compression even if 3C882 compression is enabled.
Baud Rate
By default, the baud rate is set using Autobaud. Autobaud
automatically detects the maximum data rate of your
computer’s COM port. Rates up to 115.2 Kbps can be
detected automatically. 3Com recommends that you leave
Autobaud enabled unless you want to set the baud rate to
230.4 Kbps. The command AT $B (baud rate) is used to set a
specific baud rate, such as 230.4 Kbps. Refer to Appendix B
for a list of acceptable values.