The ITU-T V.42bis can perform data compression at a rate up to four
times, depending on the format of data. That is, the throughput can be
reach as high as 57,600 bits per second when you are on-line at 14,400
bps.
The MNP 5 was popular before V.42bis was born. It can reach a
compression rate of two times, that is around half of what V.42bis can
do.
To enjoy the effectiveness of ECDC, both modems on-line should
exercise the same ECDC standard. You should always set your modem
to V.42bis auto-reliable mode by command \N3, which will
automatically negotiate with the remote modem for an available ECDC
standard.
Controlling the Modem Speaker _____________________________
In the factory, your modem speaker is preset in to medium volume and
turned on when the carrier from the remote modem is detected. You
may issue the commands L and M, with an appropriate parameter
following it, to control the volume, or turn on the speaker.
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