VEGA INSYS Modem GPRS 5.0 User Manual
Page 102
FAQ
INSYS GPRS 5.0 serial
102
Problem:
Possible cause:
Remedy
A GPRS dialup may fail. As a
symptom, a new GPRS
dialup will generate the
response NO CARRIER or
ERROR. The extended error
message
(AT+CMEE=2
)
displays the text "unspeci-
fied GPRS error". This state
may end after a few sec-
onds or minutes, or last
longer.
The reason is unknown and
is most probably due to
some error in the interplay
between the engine and the
network, or directly in the
network.
A counter for dialing attempts is set via
the commands
AT**LLWAITRST
and
AT**TCPLISTENWAITRST
. By de-
fault, the counters are set to 255 and
mirror the currently known behavior:
With each failure, only the redialing time
period is extended 20s, 80s, 320s, 640s,
1280s, 3600s, 3600s, 3600s,.....). If, for
example, is set, then the device is re-
started after the third dialup attempt (20
+ 80 + 320 s) and the dialing cycle re-
starts.
This function may be used to increase the
availability. Faster performed dialing at-
tempts may also incur higher costs.