On Tue, Dec 15, 2015 at 05:30:10PM -0500, Kevin Cummings wrote: > On 12/14/15 03:22, Ger van Dijck wrote: > > Op Mon, 14 Dec 2015 04:23:47 +0100 schreef Geoffrey Leach > > <geoff@xxxxxxxxxx>: > > > >> I have a LaserJet 1300 printer that connects via a Belkin parallel > >> port-to-USB connector. When I send a document to the printer, half the > >> time it prints without hesitation; other times it stalls until I > >> disconnect and re-connect the USB cable. When I do that, here's what > >> dmesg reports: > >> > >> [80924.737154] usb 4-1.1: USB disconnect, device number 4 > >> [80924.737587] usblp0: removed > >> [80926.381095] usb 4-1.1: new full-speed USB device number 5 using > >> ehci-pci > >> [80926.472738] usb 4-1.1: New USB device found, idVendor=050d, > >> idProduct=0002 > >> [80926.472749] usb 4-1.1: New USB device strings: Mfr=1, Product=2, > >> SerialNumber=0 > >> [80926.472755] usb 4-1.1: Product: IEEE-1284 Controller > >> [80926.472759] usb 4-1.1: Manufacturer: Belk USB Printing Support > >> [80926.497804] usblp 4-1.1:1.0: usblp0: USB Bidirectional printer dev > >> 5 if 0 alt 1 proto 2 vid 0x050D pid 0x0002 > >> > >> CUPS discovers the printer without any problems. However, when I send > >> the test document from CUPS, no amount of fiddling with the USB cable > >> will cause it to print. > >> > >> Any insights will be greatly appreciated. > >> > >> Firefox 23; kernel 4.2.6-301.fc23.x86_64 #1 SMP, everything up to date. > > > > I once did have the same problem with a HP4620 Officejet : You won't > > believe it : After some weeks of investigation and discus with HP the > > USB cable was to long ! Instead of 1,5 meter 2,5 meter. > > Cables can be a problem. Once upon a time I worked for a major > super-minicomputer manufacturer here in New England. We were adding > X-Terminals to our office equipment. They all ran on ethernet that was > then called "thick-net". Most ran well, but, a select few had cabling > problems. Most of the failures could be fixed by adding or removing 1 > meter segments of the ethernet cabling. Drove us nuts. We finally got > the thicknet repeater manufacturer together with the X-terminal > manufacturer together. Each blamed the other. Turns out both were at > fault. While the specification allows a 10% signal variance, both > implemented a +/- 5% from their own signal variance. The result was > that one manufacturer was -6% off the base frequency and the other was > +6% off. That resulted in a 12% variance, which sometimes changed > depending on how many cables were used between the devices. What a pain > in the butt! We were able to convince both of them to change their > implementations so that their equipment would inter-operate, regardless > of how many drop cables were used. > > > Maybe this can help , although it seems rediculous. > > Ridiculous or not, its a reality in the hardware world. there is definitely a limit on USB cable length, and for some devices its very strict. I have a Canon LIDE 210 USB scanner here. I had originally put together cables long enough to reach from the shelf by my desk to the computer, and it totally failed to work when using that cabling. it works only if I hold it on my lap (no room on the desk) so that the USB cable is no more than 4-5 feet long. I've used much longer USB cables with a Brother laser printer, but I was probably pushing my luck there, since the standard does specify rigid cable length limits. -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex@xxxxxxxxxxxxxxxxxxxxxx / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 --------------------------------- -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
