I have several of the Huawei modems as well. None of the 176 models but after taking a couple of them apart it seems most of the differences is in packaging. Of course, as has been mentioned before, Huawei will not let any of their specs out. It is hit and miss on most of the commands to interrogate the status and operation of the modem.
There are a couple of things that this seems to to make a problem. #1 that I rand in to is that the modems seem to not wake up or become usable until about 30-45 seconds after the USB (serial port) has been initialized by the base OS. I think this may be the time it takes for the firmware to boot and the GSM module to start reacting. One other thing you might want to check is that there is enough power for the units on the USB bus they are on. These little buggers seem to be drawing quite a bit. One thing that Huawei did give me were the power specs for a couple of the models. If I can find them I will repost the numbers. This may be the cause of the stability issue. I have also seen time where the GSM module does not actually respond to any commands for a while if it can not find a GSM tower. There must be some sort settable of timeout for this but have not been able to figure it out. So far there have not been any issues with stability but i have not stressed them out too much. My Multitech modems (TCP/IP version) have issues if I do not let them rest every once in a while. I will let you know more on this in a few days. I am going to set up a ping pong test between two of them and see what happens. ** One thing I would like to see is your ATHandler for the modem. I am tweeking one on my end to suit the modems to also handle the RSSI messages. You are using the secondary TTY that the device exposes, right? -nxn On Jan 16, 2:44 pm, Thanasis <[email protected]> wrote: > Hi there, > > I have one HUAWEI (I think it's a model 200) which *seems* stable - > BUT I am using it for development and testing, nothing like your 24h/ > day operation. > I can't really say anything about your case. If you could generate > some logs I could give it a try to spot something... > > On Jan 15, 9:57 pm, Gon Argüello <[email protected]> wrote: > > > Hi Thanasis! > > I know there is much discussion about Huawei modems but, anyway, I find > > myself in the need of writing you just to know if there is anything new > > regarding this devices. > > I've been searching in the google group discussions and couldn't find my > > specific model. I have six Huawei E176 conected to a Windows Server 2003 box > > and they are having a very unstable behaviour. > > The following are some of the problems I'm dealing with: > > 1) Sometimes they just won't let the service start (not necessarily all of > > them at the same time). I don't know when this happens or what causes them > > not to respond. Looks like if they were busy or something > > 2) If they start "successfully" sometimes many of them won't send messages, > > or maybe queue messages but finally mark them as FAILED. > > 3) Never receive messages. > > > I´ve created a Huawei_ATHandler with modified terminators, as one of the > > discussions stated, but with no luck. > > I know the easyest way is to get compatible modems, but that would be my > > last option as I already have six of these ones. > > > Many thanks in advance. Any help will be much appreciated. > > > Regards, > > > Gonzalo Argüello
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