Re: [linux-usb-devel] Active extenstion cables

2001-10-16 Thread Vojtech Pavlik
On Tue, Oct 02, 2001 at 09:19:00PM +, Pavel Machek wrote: > > They could have a DC-DC converter built in to bump up the output > > voltage. They usually just have thicker (more copper, less voltage drop) > > power lines in the cable, though. > > Read usb spec. They say that length *is* probl

Re: [linux-usb-devel] Active extenstion cables

2001-10-06 Thread Pavel Machek
Hi! > They could have a DC-DC converter built in to bump up the output > voltage. They usually just have thicker (more copper, less voltage drop) > power lines in the cable, though. Read usb spec. They say that length *is* problem, due to speed-of-light.

Re: [linux-usb-devel] Active extenstion cables

2001-09-29 Thread Vojtech Pavlik
On Sat, Sep 29, 2001 at 03:54:30AM -0700, Sami YOUSIF wrote: > I have seem some "noname" so called "active" cables that do not have the > correct grounding/wiring/distance requirements. > > Also... since many "active cables" do not have their own power, they can > only work to extend low power de

Re: [linux-usb-devel] Active extenstion cables

2001-09-29 Thread Sami YOUSIF
nufacturers will only troubleshoot their devices if the only items on the chain are their OWN hubs or connected to the root hubs] ... - Original Message - From: "Vojtech Pavlik" <[EMAIL PROTECTED]> To: "Greg KH" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTE

Re: [linux-usb-devel] Active extenstion cables

2001-09-29 Thread Vojtech Pavlik
On Fri, Sep 28, 2001 at 04:51:46PM -0700, Greg KH wrote: > These devices are _very_ despised by the USB group, and are the main > reason that you have to sign a contract to use the USB 2.0 logo. They > also break the electrical USB spec quite badly, and cause problems, like > you're seeing :) A

Re: [linux-usb-devel] Active extenstion cables

2001-09-29 Thread Vojtech Pavlik
On Fri, Sep 28, 2001 at 05:26:19PM -0700, Mark R. Rubin wrote: > > Could you repeat the steps described in my e-mail and see if the > > failures happen? (ie the device on the extension cable is not seen after > > the hub the cable is attached to is unplugged and replugged?) That'd > > help. > >

Re: [linux-usb-devel] Active extenstion cables

2001-09-28 Thread Mark R. Rubin
Vojtech Pavlik <[EMAIL PROTECTED]> writes: > Could you repeat the steps described in my e-mail and see if the > failures happen? (ie the device on the extension cable is not seen after > the hub the cable is attached to is unplugged and replugged?) That'd > help. o Sorry, your first email confus

Re: [linux-usb-devel] Active extenstion cables

2001-09-28 Thread Greg KH
On Sat, Sep 29, 2001 at 12:29:57AM +0200, Vojtech Pavlik wrote: > Hi! > > Did anyone managed to get active extension cables work with Linux? These devices are _very_ despised by the USB group, and are the main reason that you have to sign a contract to use the USB 2.0 logo. They also break the

Re: [linux-usb-devel] Active extenstion cables

2001-09-28 Thread Vojtech Pavlik
On Fri, Sep 28, 2001 at 04:03:25PM -0700, Mark R. Rubin wrote: > Vojtech Pavlik <[EMAIL PROTECTED]> writes: > > > Did anyone managed to get active extension cables work with Linux? > > ... > > o I have successfully tested a product called either "USB Repeater > Cable" (on the package) or "USB

Re: [linux-usb-devel] Active extenstion cables

2001-09-28 Thread Mark R. Rubin
Vojtech Pavlik <[EMAIL PROTECTED]> writes: > Did anyone managed to get active extension cables work with Linux? > ... o I have successfully tested a product called either "USB Repeater Cable" (on the package) or "USB Active Extension Cable" (on the female end of the cable where the internal

[linux-usb-devel] Active extenstion cables

2001-09-28 Thread Vojtech Pavlik
Hi! Did anyone managed to get active extension cables work with Linux? I do have one to achieve long distance between the workplace and the computer itself (about 10 meters). It's mostly a cable with a hub attached to it, though only the electric part the hub - it repeats the signals, but doesn't