3Com ACCESSBUILDER 7000, User Manual

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negotiated between modems, providing a 16.7% increase in speed
over that which can be negotiated using V.32bis. If the modem you are
calling is unable to operate at the same high speeds as your modem,
an optimum data transfer rate is negotiated between the two using the
default configuration settings.
When using the higher line speeds made available by V.32terbo, the
throughput rate can be increased further by using the modem’s error
correction and data compression facilities. Compression factors remain
virtually unaffected by the increase in line rate, thereby producing a real
improvement in data transmission times over those achieved using V.32bis.