I am inserting the modems ( the 2 currently I have ) into a USB port each. I assume the modem contains some kind of USB to serial converter ... So I am not using a HUB but that's what the driver is being recognized by the OS
I didn't have any port lockouts so far ... and I am using Linux ( CentOS 6.2 ) Still my question holds ... would serial modems make any difference in terms of performance ? Anyone had any experience with both ? Regards, MaxX On Tuesday, July 31, 2012 5:42:50 PM UTC+3, Nizam wrote: > > 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/-/O7pvdGs8n1MJ. For more options, visit https://groups.google.com/groups/opt_out.
