Fast Connect And V23 Reverse Channel Commands; Testing And Debugging At Commands Set - US Robotics 56K USB Modem User Manual

+VTX—Enter Voice Transmit Data State
Use this command to initiate the voice transmission process with the voice stream sent through the comm
port. Applications using the wave interface do not use the +VTX command.
There are two ways for the DCE to leave the voice transmit state:
• Modem receives <DLE>-<EXT>in voice stream.
• DTE/DCE inactivity timer expires.
Result codes:
• CONNECT if the DCE is connected to another off-hook DCE.
• ERROR if the DCE is not connected to at least one other off-hook DCE.

Fast Connect and V23 Reverse Channel Commands

The AT fast connect command set is not covered by any ITU recommendation. This set of commands
allow point-of-sale (POS), set-top boxes (STB), and other applications to quickly connect to a host and
transfer small amount of data per connection.
Use this command to select the fast connect modulation or to disable fast connect. The data transfer
modes supported for V.22 fast connect are asynchronous (\N0), SDLC (\N6) and V.80 HDLC (+ES, +ESA)
command. The data transfer mode supported for V.29 is +FCLASS = 1.0.
Result codes:
• OK if <value> = 0—8.
ERROR if <value> ≠ 0—8.
•
Table 202. \F<value> Commands
Command
\F0
\F1
\F2
\F3 and \F4
\F5
\F6
\F7 through \F8

Testing and Debugging AT Commands Set

S109—V.PCM Connection Options
Use this register for testing only. S109 is a guide for the connection type. Each bit of the register enables or
disables a different protocol or function of the modem.
Note: The downstream connection rate is determined by the S38.
Range: 0—2
• Default: 1
Fast connect is disabled (default).
V.22 fast connect is enabled.
V.29 fast connect is enabled.
Reserved.
RTS used to reverse V.23 channel.
DTR used to reverse V.23 channel.
Reserved.
56K USB Modem
Description
Command Reference - 88
User Guide