insys icom 56k Manual page 97

INSYS Modem 56k AC/DC 4.2
Command
AT&V<n>
Description
Show the configurations
AT&V0
The active configuration of the modem, the saved user defaults and
the saved phone numbers 0 to 3 (the parameter 0 may be omitted)
are displayed.
AT&V1
Displays the diagnostic data of the last connection (connection
partner, reason for disconnect).
TERMINATION REASON: Reason for disconnect.
E.g.: Connection termination via command (ATH: "LOCAL RE-
QUEST").
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 direc-
tion, 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:
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 com-
pression method can be set with the command AT%C).
LINE QUALITY: Displays the quality of the data connection (devia-
tion 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 be-
tween 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 distor-
tions; 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.
AT&V3
Display of the currently set baud rate (AT*S<n>) as well as the
currently set data format (AT*U<n>).
The data rates may vary if a fall forward, fall back or
AT Command Reference
97