Messages in this thread | | | Date | Mon, 25 Aug 2008 21:55:22 +0530 | From | "umesh kernel" <> | Subject | Re: better support for EV-DO AC8700 800 M usbserial modem ?? |
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On Mon, Aug 25, 2008 at 9:19 PM, Greg KH <greg@kroah.com> wrote: > On Sun, Aug 24, 2008 at 09:41:33AM +0530, ctuxer wrote: >> hi everyone , >> >> i have been using the EVDO AC8700 modem (usbserial) with kernel 2.6.26.2 , >> it uses the 'option' module along with the generic usbserial module . Well >> i am happy for the improved support for the modem handling in the new >> kernels( like now i don have to modprobe with the vendor and product IDs ) >> , there is one point specific to this modem which is still not handled , >> ..... the modem switches between EVDO and CDMA mode when the signal >> strength is low or when there is a bandwidth overload at the vendor's( the >> service provider , bsnl in my case ) tower . This switch in the mode is >> not recognised by the driver and the connection is lost once this switching >> occurs . I have to restart the wvdial program to reconnect . >> >> But if the modem were in CDMA mode when i connect , then the connection is >> not lost when the modem switches back from CDMA to EVDO . I really don know >> enough to understand what is the difference between the two cases or what >> can be done to improve the support for this usbserial modem , ... can >> anyone help ? > > This looks like something the userspace side has to handle, the option > driver is just a dumb "pass-through" type driver, it doesn't really > control the modem at all. The "control" channel on the modem allows > this to happen, a userspace program drives this. > > good luck, > I am using the same EVDO modem, but using KPPP as dialer and using option module(also tried airprime module after adding the vendor and product ids ). I am not facing this. issue. Connection is fine when switching occurs. I can see that whenever modem light turns from GREEN(EVDO) to Orange(CDMA 1x RTT) or back , only the data rate is changing but the conenction is fine. Please check with KPPP dialer and enable the option "Auto reconnect".
Regards, Umesh
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