Black Box MD1276A, User Manual

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AT Commands
Page 31
Increasing Data Throughput with Error Correction & Data
Compression
Data throughput refers to the amount of data being transferred. Error correction and data
compression allow you to increase data throughput in comparison to if error correction and data
compression were not selected. To allow error correction and data compression to operate with
the highest possible throughput, the terminal speed of your modem (the speed it communicates
with your computer) must be higher than the line speed (the speed it communicates with the
remote modem).
The best way to operate with error correction and data compression is to set your modem for a
constant speed of 57,600 bps, 115,200 bps or higher (set the terminal speed of your computer
to 57,600 bps, 115,200 bps or higher and issue the command AT\N3 to the modem) with flow
control. RTS/CTS flow control is the preferred form of flow control. Your communications
software must also be set to use the same type of flow control.
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Some computers cannot cope with receiving data at speeds above 19,200 bps. If
you wish to run at high speeds, you should install a COM port that has a 16550
chip in place of your regular COM port. The 16550 chip allows your computer to
accept data at very high speeds.