Manual

AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
102184B Conexant 3-85
Data Call State Model
For purposes of this command, there are four data call states, and associated status issues:
• Call Setup
− Calling DCE: get dial tone, generate dial digits, detect call progress signals.
− Answering DCE: detect ringing, detect CallerID, etc.
• Negotiation
− V.25 calling tone/answer tone exchanges
− V.8 or V.8bis call function negotiations
− V-series modem carrier detection and training
− Modem-to-modem protocols (e.g., V.42, V.42bis).
• Data Transfer
− Bit-error rates, for each direction
− Rate renegotiation
− Retraining
• Call Termination
− protocol disconnect signals
− carrier disconnect signals
− loss of carrier
− excessive error rates
Command Syntax
In response to this command, the modem will report one or more lines of information text
as defined below. Information text format conforms to V.250; each line is preceded by a
<CR><LF> pair, and terminated by <CR><LF>. (CR and LF characters may be changed
by writing new values to the contents of registers S3 and S4, respectively.)
The modem may generate a single line or multiple lines, followed by a standard OK final
result code. For example, if call setup failed, only that result is useful. Each information
text line is formatted as follows, including one or more key=value pairs:
Syntax
#UD
Response
DIAG <token key=value [[key=value] [key=value]] …>