Siemens Insys 56k Operating Manual page 54

AT commands
Command
AT&V<n>
48
Description
Display configurations
The active configuration of the modem, the saved user defaults and the
AT&V0
saved phone numbers 0 to 3 (the parameter 0 may be omitted) are
displayed
Displays the diagnostic data of the last connection (connection partner,
AT&V1
reason for disconnect).
TERMINATION REASON: Reason for termination. For example
manually with the command ATH: "LOCAL REQUEST".
LAST TX rate: Last baud rate at the phone line in send direction,
prior to the termination.
HIGHEST TX rate: Highest baud rate that was achieved at the
phone line in send direction, prior to the termination.
LAST RX rate: Last baud rate at the phone line in receive direction,
prior to the termination.
HIGHEST RX rate: Highest baud rate that was achieved at the
phone line in receive direction, prior to the termination.
Note: The data rates may vary if a fall forward, fall back or retrain
occurred during the connection. To impact the negotiated data rate, use
the command AT+MS.
PROTOCOL: Displays the used error correction protocol. "LAPM" equals a
V.42 secured connection. For "NONE", the connection was not error
corrected (the error corrected can be influenced with the command
AT\N).
COMPRESSION: Displays the used data compression method. The
example shows the used compression method V.42bis (the compression
method can be set with the command AT%C).
LINE QUALITY: Displays the quality of the data connection (deviation
from the eye diagram). Low values indicate a good line quality. The line
quality value must be evaluated differently depending on the negotiated
data rate.
Connections with more than 9600 baud will reach the value "000" for
good lines and should not have values of more than "010".
For connections with 33600 baud good lines will have values between
010...030. Depending on the settings and the modulation type a fall back
or retrain is triggered if the line quality is too bad to enable a new
negotiation of the connection (if necessary with a slower speed).
Rx LEVEL: Displays the receive level (which is internally applied at the
modem chip) in –dBm. High values indicate a low input level, low values
indicate a high input level. The optimum receive levels range from
approx. 012 to 028. To high levels could cause distortions; too low levels
will cause the line noise to have a negative impact on the connection
quality.
Local Rtrn Count: Number of retrains (renegotiation of the
connection), triggered by the local modem.
Remote Rtrn Count: Number of retrains (renegotiation of the
connection), triggered by the remote modem.
Pocket Modem 56k
Dezember 05