US Robotics COURIER - Page 129

COURIER HIGH SPEED MODEMS
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Register
Default Function
Error control handshaking options: select the
total values of bits 4 and 5.
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Bit 4 Bit 5 Result
0 0
Complete handshaking
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sequence: V.42 Detection,
LAPM
error controt MNP.
16
0
Disable MNP.
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0 32 Disable V.42 Detection and
LAPM.
16 32 Disable Detection
phase, if you
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know that the remote modem
does LAPM, but not the
Detection phase.
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S28
8
Sets the duration, in tenths of a second, of
the extra 3000
I 600 Hz answer tones sent
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during V.32 handshaking. Default= 8 (.8
seconds). This gives V.32
modems
additional time to connect in V.32 mode
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before timing out.
If there is difficulty answering older,
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manually operated V.32 modems, for
example, modems that require a button to
be pushed in order to dial, try lengthening
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the duration of the extra tones.
Setting S28 to
zero eliminates the extra
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tones, resulting in a faster connect time i(
for example, the modem is set to use V.21
modulation (300 bps) or V.23 modulation
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(1200 bps). Sets the duration, in l/lOths of
a second, of the V.32 handshake.
S29 20 Sets the duration, in tenths of a second, of
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the answer tones sent during V.21 hand-
shaking. Default= 20 (2 seconds). This
gives
V.21 modems additional time to
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connect in V.21 mode before timing out.
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B-18 Summaries and Tables
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