US Robotics COURIER User Manual page 142

COURIER HIGH SPEED MODEMS
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&Mn
Error Control (ARQ) and Synchronous Operation.
&MO Normal asynchronous mode, error control disabled.
&Ml Synchronous mode, error control disabled.
&M2 Reserved.
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&M3 Reserved.
&M4 Normal/ ARQ asynchronous mode (Default). Normal
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connection if ARQ connection cannot be made.
&MS ARQ asynchronous mode. Modem hangs up if ARQ
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connection cannot be made.
&Nn
Link Rate (DCE/DCE) variable or fixed. With fixed link rate,
modem hangs up if called or calling modem is operating at a
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different rate.
&NO Variable link operations (Default). Modem negotiates
highest possible link rate with remote modem.
&Nl 300 bps.
&N2 1200 bps.
&N3 2400 bps.
&N4 4800 bps.
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&NS 7200 bps.
&N6 9600 bps.
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&N7 12K bps.
&NB
14.4K bps.
&N9 16.8K bps (HST-to-HST only).
&Pn
Pulse dialing make/break ratio.
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&PO
U.S./Canada make/break ratio (Default).
&Pl
U.K./some Commonwealth countries make/break ratio.
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Command Summary C-9