Serial-USB-Serial conversion is better avoided if possible. If going for the USB option make sure you have enough USB ports on the server itself without having to introduce a USB hub. I've tried many hubs and all of them ended up causing frequent port lockups on Windows.
On Tuesday, July 31, 2012 5:56:35 PM UTC+5:30, MaxX wrote: > > Thanks for your answer ... > > I have 2 modems each one in an USB port > i've been testing different setups with my USBs ports to try to find best > setup. After your email I thougt that if I put them in different ports / > motherboards hubs will make any difference. but it didn't > > 1st question that I have now is if serial modems will make any difference. > I plan to buy a 8 port modem pool and I can't decide if to buy USB or RS232 > ( via multiserial board ) > > 2nd one is actually an ideea ... to create a QueueManger thread for each > gateway and eventually have 10 paralel threads for 10 modems ending with > the possibility to send independently SMS via 2 modems (almost) at the same > time > > Not sure how QueueManger is implemented now ... I'll dig into it > > Regards, > Marius > > > > On Saturday, July 28, 2012 12:06:19 PM UTC+3, T.Delenikas wrote: >> >> Well, I tried to find something (like a recent change in code, perhaps) >> that could justify this, with no luck. >> On the other hand, this issue has been reported again recently, so >> something is really going on here... >> >> The really bad thing is that I currently don't have access to a >> multi-serial board in order to test things. >> I've seen that USB hubs (or maybe their drivers?) sometimes appear as if >> they lock concurrent port access. I am not the most appropriate person to >> follow low-level specs and controller capabilities, but I've seen articles >> like this: >> http://www.avsforum.com/t/1277379/recommendation-please-most-reliable-self-powered-7-port-usb-hub >> >> which suggest that low-level hubs may indeed have a problem allowing >> concurrent access to all ports. I've seen terms like " *Supports 4 >> Concurrent Non-periodic Transactions* ". I guess that all of these >> references have something to do with the hub's ability to allow concurrent >> port access and how many individual controllers they have (i.e. ports per >> controller ration). Do you or anybody else know something about it??? >> >> Needless to say that such hubs have a cost of $50 - $100 + - check this >> one: http://www.cooldrives.com/12poinusb20h.html and have nothing to do >> with the $10 hubs found in every stupid accessory store... >> >> On Thursday, July 26, 2012 9:54:21 PM UTC+3, MaxX wrote: >>> >>> >>> modems via USB ... >>> pl2303: Prolific PL2303 USB to serial adaptor driver >>> >>> -- You received this message because you are subscribed to the Google Groups "SMSLib Discussion Group" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msg/smslib/-/8DcyqEQyHdUJ. For more options, visit https://groups.google.com/groups/opt_out.
