Guard Tone (&Gn); Pulse Dial Make/Break Ratio (&Pn) - US Robotics COURIER User Manual

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BO
Bl
COURIER HIGH SPEED MODEMS
This setting is required for V.32/V.32
bis operation. It
also selects the CCITT V.25 answer tone used outside of
North America. This answer tone is incorporated into the
V.32/V.32
bis recommendations.
This setting is the default for the Courier V.32
bis and
Dual Standard modems. All you need to do is make sure
that the modem is set for Auto Answer (ATSO=l).
Set Courier HST modems to BO to answer HST-mode
international calls. The BO setting does not affect the mo-
dem's ability to call or answer domestic modems. It takes
slightly longer, however, to connect.
This setting is required for HST operation. It also selects
the Bell 2225 Hz answer tone used in the U.S. and Canada.
This is the default setting for the Courier HST.
Guard Tone (&Gn)
This setting applies only to overseas calls at 2400 or 1200 bps.
British phone switching systems require the modem to send an
1800 Hz guard tone after it sends an answer tone. Some other
European phone networks require a 550 Hz guard tone. Guard
tones are not used in the United States or Canada.
&GO No guard tone, U.S./Canada. Default.
&Gl 550 Hz guard tone follows answer tone.
&G2 1800 Hz guard tone follows answer tone, United
Kingdom and some Commonwealth countries. Requires
BO setting.
Pulse Dial Make/Break Ratio (&Pn)
This command sets the ratio of the off-hook/ on-hook (make/
break) interval for pulse dialing. The default sets the modem for
use in North America. The ratio must be changed if the modem
is used in the United Kingdom and some Commonwealth
countries.
&PO Make/break ratio, U.S./Canada: 39%/61 %. Default.
&Pl Make/break ratio, United Kingdom, some
Commonwealth countries: 33%
I
67%.
Asynchronous Operations 6-13