Command Reference Manual
100722A
Conexant
3-55
3.2.9 Diagnostic Commands
3.2.9.1 #UD – Last Call Status Report
#UD is an action command requesting reporting of logged operation events. It does not take parameters and must be the last
command in the command line.
The modem logs aspects of their operation for each call, and saves these results until cleared by one of the following events:
1. Power off.
2. Hard reset (e.g., negate DTR with &D3 set; reset button).
3. Soft reset = ATZ or AT&F.
4. ATD command issued.
5. ATA command issued.
6. Automatic answer (e.g., set register S0>0 and ring detected).
These results are NOT cleared by changing DTR, V.24 circuit 108.2, if &D0, &D1 or &D2.
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
