Westermo ID-90 - Manual (Page 27)

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E – Local echo
Selects the local echo in command mode.
ATE0No local echo
ATE1
Local echo on in command phase (default)
!%E – Enable/Disable Line Quality Monitor
and Auto-Retrain or Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line quality and request
a retrain (%E1) or fall back when line quality is insufficient or fall forward when line qual-
ity is sufficient (%E2). The parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
AT!%E0 Disable line quality monitor and auto-retrain.
AT!%E1 Enable line quality monitor and auto-retrain.
AT!%E2 Enable line quality monitor and fallback/fall forward.
Fallback/Fall Forward. When %E2 is active, the modem monitors the line quality
(EQM). When line quality is insufficient, the modem will initiate a rate renegotiation to a
lower speed within the V.34/V.32 bis/V.32 modulation speeds. The modem will keep
falling back within the current modulation if necessary until the speed reaches 2 400 bit/s
(V.34) or 4 800 bit/s (V.32). Below this rate, the modem will only do retrains if EQM
thresholds are exceeded. If the EQM is sufficient for at least one minute, the modem will
initiate a rate renegotiation to a higher speed within the current modulation speeds. The
rate renegotiations will be done without a retrain if a V.32 bis connection is established.
Speeds attempted during fallback/fall forward are those shown to be available in the rate
sequences exchanged during the initial connection. Fallback/fall forward is available in
error correction and normal modes, but not in direct mode.
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