| Forum Home | ||||
| Press F1 | ||||
| Thread ID: 85543 | 2007-12-13 23:56:00 | Length limitation of USB cable - workaround | Tukapa (62) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 621015 | 2007-12-13 23:56:00 | Hi all Just after a few cables to extend a PC from a projector setup. After a 20m 15pin VGA extension cable (no problem there) After a 20m composite AV cable (no problem there) After a 20m USB extension cable - problem is that the longest you can go is 5m from what I have read. I have also read that you can run 5m cable - usb hub - 5m cable - usb hub - 5m cable - usb hub - 5m cable which would give me my 20m. My question is would el cheapo hubs suffice or would they have to be powered? And would the overall cost of that setup mean that something like this (www.trademe.co.nz) would be a better option? All these questions! Thanks in advance. |
Tukapa (62) | ||
| 621016 | 2007-12-14 00:09:00 | I personally use a 20m usb cable with a projector (for the remote to control the PC) and it works sweet as. I think a signal can get through, just not much power (flash drive won't work when plugged into extension). I know a printer won't work on any more than a 10m cable though, no doubt someone has some exact figures. :p | wratterus (105) | ||
| 621017 | 2007-12-14 00:46:00 | You can get active USB extension cables (search.dse.co.nz 71b&site=&w=active+usb&submit.x=0&submit.y=0&submit=Go) of 5m in length. From memory you can connect up 4 of them so that would give you 20m. |
CYaBro (73) | ||
| 621018 | 2007-12-14 02:21:00 | The cable length is controlled by the time it takes for a signal to go from on end to the other. It matters because it is a bidrectional cable, and if one starts transmitting while the other end has only just started tranamitting you geta collision. The extender cables carry out the full collision prevention protocol in each section. This can cause a considerable reduction in the speed, and I'm not sure how many such units can be connected in series. You can get units which let you use up to 60 m of Cat5 cable. Mgram (www.mgram.co.nz/product_info.php?products_id=3901&osCsid=7ba3b92094fde9767734ba251664c526) list one. It's only for USB1.1 , so this might be a limitation. |
Graham L (2) | ||
| 621019 | 2007-12-14 02:40:00 | You can get units which let you use up to 60 m of Cat5 cable. Mgram (www.mgram.co.nz/product_info.php?products_id=3901&osCsid=7ba3b92094fde9767734ba251664c526) list one. It's only for USB1.1 , so this might be a limitation. Depending on the situation its probably easier to run Cat5 to the location than USB and would give greater flexibility. Good find Graham. |
Pete O'Neil (6584) | ||
| 621020 | 2007-12-14 04:18:00 | Why not try wratterus's answer first? I've seen reports of cameras using 36 m of USB for remote operation without going active. | PaulD (232) | ||
| 621021 | 2007-12-14 10:17:00 | You can get units which let you use up to 60 m of Cat5 cable. Mgram (www.mgram.co.nz/product_info.php?products_id=3901&osCsid=7ba3b92094fde9767734ba251664c526) list one. It's only for USB1.1 , so this might be a limitation. Looks similar to the doodacky I linked to in my OP from TradeMe. Don't know which option I will go for - will have to spend some time thinking about it! Cheers all. |
Tukapa (62) | ||
| 1 | |||||