I have done some further testing about this issue. Even with USB
extension cables (that otherwise work fine), there are some problems
still. For example, I had one telosb mote that inexplicably stopped
receiving packets from the PC after about 15 minutes in one try,
although it work without failing for over an hour on another trial.
I am wondering which Linksys router you ended up using:
http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1115416907197&pagename=Linksys%2FCommon%2FVisitorWrapper&lid=0719746152B04
or
http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1115416907844&pagename=Linksys%2FCommon%2FVisitorWrapper&lid=0784446152B06
Also, did you have success with extension cables from specific
manufacturers?
I appreciate your continued help in advance.
Thanks,
Tal
>>>> - Your usb hub is bad? we had to buy three different types of usb
>>>> hubs, just to find a good one.
>>>> And at least for me, I see more problems when I use an usb hub.
>>> Unfortunately, due to the physical construction of my PC's, I need
>>> to
>>> use some sort of hub or extender to actually connect the motes. I will
> try to find another PC where this is not the case. However, I did try
multiple types of extender cables and hubs and the problem seems to
repeat on each of them.
>>
>> I am not so concerned about the cables as long as you are not connecting
> several cables in serial (you can see noticeable power attenuation if
you connect several cables in serial), but the hubs do matter.
>> Don't trust any cheap hubs. Dlink was not so great. Linksys 4-port was
> what we ended up using, but still not as good as no hub at all.
>
> Thank you for your reply.
> It appears that several hubs and a certain extension cable were at
> the
> heart of the problem. With appropriate USB connections, I was able to
get TestSerial working in both directions for up to 1000 packets. I will
do more stress testing with TestSerial and more complex applications in
the next few days.
> While the extension cable was probably defective, the hubs appear to
> work well with other devices. Do you know why some hubs have such issues
with telosb motes?
>
> Thanks,
> Tal
>
>
>
>
>
>
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