S19 - reserved, S20 - reserved – Comtrol AT Commands User Manual
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AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
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Conexant
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Bit 5
V.29 FastPOS fallback selection
0 =
Enable V.29 FastPOS with fallback to standard V.22 bis.
(Default)
1 =
Enable V.29 FastPOS with fallback to V.22 fast connect.
Bit 6
Fast Bell 103/V.21 (applicable only if Bell 103, V.21, or V.23 half-
duplex (HDX) is enabled; see +MS and B2 commands)
0 =
Enable standard Bell 103/V.21/V.23HDX (Default)
1 =
Enable fast Bell 103/V.21 or non-standard V.23HDX 21
Bit 7
Not used (Reserved)
S19 - Reserved
S19 is supported for backwards compatibility only. No value can be written. Responds
with default value.
Range: None
Default: 0
S20 - Reserved
S20 is supported for backwards compatibility only. No value can be written. Responds
with default value.
Range: None
Default: 0