Intel MD566X - Manual (Page 52)

56K V.92 Data, Fax, and Voice Chipset
52 Intel Confidential Programmer’s Guide
&Pn 0
Dial Pulse Ratio: This command determines the make/break (that is, off-
hook/on-hook) ratio during pulse dialing.
n = 0** Make = 39%; Break = 61% at 10 pulses per second—for use in the
United States.
n = 1 Make = 33%; Break = 67% at 10 pulses per second—for use in the
United Kingdom and Hong Kong.
&Q0 0
Select Communication Mode: This command controls whether the modem
is operating in asynchronous or synchronous mode. This modem only sup-
ports asynchronous mode. This command is the same as &M0.
n = 0** Asynchronous normal. The modem operates asynchronously in
both command and online modes.
&Sn 0
DSR (Data Set Ready) Option: This command controls how the modem
treats the DSR signal.
n = 0** DSR circuit always on
n = 1 DSR circuit is on during handshaking, off in test or idle modes. DSR
is off when the carrier is lost.
&Tn 0
Data Mode Self-Test Command: This command is used in data mode (ex-
cept
V.90 and V.92 modes) to initiate and terminate loopback tests for testing
modem-to-modem and DTE-to-modem data communication integrity.
n = 0** Terminates test in progress
n = 1 Local analog loopback
n = 8 Local analog loopback with self-test
&Un 0
Disable Trellis Coding: This command selects whether the modem transmits or re-
ceives modulated 9600 bps carrier with QAM or Trellis encoding for V.32.
n = 0** Enabled (Trellis modulation with QAM modulation as a fallback)
n = 1 Disabled (QAM modulation only)
Table 3-4. Data Mode Command Descriptions (Continued)