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PN 88300150
The MT2834MR can be set for three different modes of operation, along with activating data compression
in Reliable mode. Normal mode disables error correction, Reliable mode enables it, and Auto-Reliable
mode allows the modem to automatically turn V.42 on when it detects its use in another modem.
Flow control methods are used by the MT2834MR to prevent data loss from buffer overflow. The modem
can both initiate it ("flow control") and respond to it ("pacing"), using either Xon/Xoff commands or
RS232C signaling via CTS (from the modem) or RTS (from the computer or terminal). Hewlett Packard
ENQ/ACK pacing is also supported. If needed, Xon/Xoff commands can be "passed through" the modem
to a remote computer or terminal.
The MT2834MR's speed conversion feature allows it to operate at one speed over the telephone lines
and another speed at the RS232C serial port. This allows the computer or terminal to communicate with
the modem at a fixed speed of up to 115,200 bps, while the modem operates at various speeds up to
28,800 bps. This ability is vital if data compression is to be effective (your terminal or computer must
present data to the phone line at a higher speed than which the modem is sending it over the phone line).
This concludes what is probably the most difficult chapter in this manual, covering techniques that
bewilder many modem users. If you feel that you have mastered these concepts of Error Correction, Data
Compression, and Speed Conversion, congratulations!
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