INSYS 336 4.1, Руководство по эксплуатации

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INSYS Modem 336/56k 4.1 (UL)
AT
Command Set
Command Description
AT&V<n>
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 dis-
played.
AT&V1
Displays the diagnostic data of the last connection (connection partner,
reason for disconnect).
TERMINATION REASON:
Reason for connection termination.
E.g.: connection termination via 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 oc-
curred 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 cor-
rected (the error corrected can be influenced with the command
AT\N
).
COMPRESSION:
Displays the used data compression method. The exam-
ple 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 nego-
tiation 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 receives 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 connec-
tion), triggered by the local modem.
Remote Rtrn Count:
Number of retrains (renegotiation of the con-
nection), 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>
).
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