Comtrol AT Commands - Manual (Page 137)

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 3-111
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