Intel MD566X - Manual (Page 30)

56K V.92 Data, Fax, and Voice Chipset
30 Intel Confidential Programmer’s Guide
allows the DTE-to-modem data rate to be different from the modem-to-modem data rate. Users can
take advantage of this feature by setting the DTE-to-modem rate to a high speed like 115,200 bps
and letting the modem negotiate the best line rate.
The MD566X chipsets can be configured (by the +MS=m command) to support either
asymmetrical or symmetrical connections. The modem transmits and receives at the same speed in
symmetrical connections and at different speeds in asymmetrical mode. V.90 and V.92 connections
are always asymmetrical. V.34 mode connections can be either symmetrical or asymmetrical. Note
that the transmitter speed and receiver speeds typically are different for most V.34 connections over
the PSTN.