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Modem Command Reference Modem Command Reference
Modem Command Reference Modem Command Reference Modem Command Reference
Command Command
Command Command
Command Description Description
Description Description
Description
Auto-retrain
Determines whether or not the modem automatically monitors the line
quality and requests a retrain when necessary.
AT%E0 disables line quality monitor auto-retrain
AT%E1 enables line quality monitor auto-retrain
A A
A A
AT%E2 T%E2
T%E2 T%E2
T%E2 enables line quality monitor auto retrain and auto fall enables line quality monitor auto retrain and auto fall
enables line quality monitor auto retrain and auto fall enables line quality monitor auto retrain and auto fall
enables line quality monitor auto retrain and auto fall
back/forward. (default)
back/forward. (default)
back/forward. (default) back/forward. (default)
back/forward. (default)
Report Received Signal Level
AT%L 009 = -9 dBm, 010 = -10dBm, etc. all the way to 043 (-43
dBm)
Line signal and noise are determined by the unit of measurement dBm
(decibel referenced to one milliwatt). To arrive at a signal/noise ratio, the
noise level is subtracted from signal level in dBm.
Report Line Signal Quality
AT%Q 009 = -9 dBm, 010 = -10dBm, etc. all the way to 043 (-43
dBm)
Returns a “high-order” byte of the calculated EQM (“eye quality
monitor”). This can range from 0 to 255. When the value is 8 or greater,
the modem will automatically retrain if enabled by the AT%E1
command. The value for a normal connection ranges from 0 to 2 and
approaches 8 for a progressively poorer connection. Returns an OK result
code.
000 to 007 no retrain
008 to 255 retrain performed if enabled by %E1.
9346.p65 11/20/97, 9:34 AM 39