Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: USB length max ??

  1. #1
    Low Bitrate
    Join Date
    Apr 2006
    Location
    Maryland
    Posts
    106

    USB length max ??

    Hello all,

    A brief introduction to my question:

    I acquired a Lacie External CD/DVD player that has an option to use a USB as power from a powered port. I am dedicating a 4 port powered hub just for this device as to not upset the power sent to it. The hub is powered by the smaller 4pin connector (the kind that powers a HD) from my OPUS 90W (via splitter/adaptor) My computer is located in the trunk, and I thought that I could mount the USB hub near the computer in the trunk, and then run a long USB to the drive located in the dash. However, I heard that there could be power loss running a powered USB cable from 10-15 feet. Has anyone experienced this?

    Or should I just play it safe and mount the 4-port hub in my center console and extend the power wires from the OPUS to the hub; and from there run the USB cable to the drive thereby eliminated the length problem all together. It's just more work to mount the hub and extend the wires.

    Any thoughts or comments would greatly be appreciated.

    Sorry I couldn't keep it more brief than that.

    TIA

  2. #2
    _
    Join Date
    Mar 2004
    Location
    Little Elm, Texas
    Posts
    13,500
    mount it in the center console.

    I've heard the limit on USB is 16 feet.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  3. #3
    Maximum Bitrate pepsibobby's Avatar
    Join Date
    Dec 2005
    Location
    Kaiserslautern Germany
    Posts
    648
    yep 16 feet without a powered hub. I had that same prob and had to move my whole computer just to use the TS.
    Cant code cause I dont know how, but give me the paint bucket and my eraser and have at you!

  4. #4
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
    Join Date
    Oct 2004
    Location
    NY
    Posts
    6,234
    first of all there are usb extenders, called repeaters..., that'll give you more than enough length, & there not to expensive...

    & 16' is just the usb standard, doesn't mean it won't work at 20' & doesn't mean it'll work at 12'....

    my advice to you is, you really don't need a hub, what I would do is try it first with just a usb extention cable...if it's a no go, I would then give the drive a power plug... theres no reason not to, if it's a burner it'll help alot more than a hub, which is only going to give you 500ma on each port regardless of weather the other ports are used or not from the hub in most cases & with most hubs....

    the option for usb powered is just a convienience for portable laptop use, & to not have to provide power, but in a permanent mount power should be provided for the best reliability...

  5. #5
    Low Bitrate
    Join Date
    Apr 2006
    Location
    Maryland
    Posts
    106
    Thanks for the responses. It is a burner and although I won't be burning much while driving, I might as well give it constant power.

    Am I right by assuming that I can do the same thing as I am with powering my TS? which entails cuting the AC adaptor, extending the wires, then attaching it to a 4 pin molex to the correct terminals (in this case 5v and ground) and connecting it to the OPUS? Or is it more complicated than that? Now I just have to figure out which wire is which

    Also, what gauge do you think will suffice? would regular speaker wire do?

    Thanks again

  6. #6
    Variable Bitrate jschrauwen's Avatar
    Join Date
    Jul 2006
    Location
    Frankford, Ontario, Canada
    Posts
    377
    Quote Originally Posted by 2poor4mods View Post
    Thanks for the responses. It is a burner and although I won't be burning much while driving, I might as well give it constant power.
    Am I right by assuming that I can do the same thing as I am with powering my TS? which entails cuting the AC adaptor, extending the wires, then attaching it to a 4 pin molex to the correct terminals (in this case 5v and ground) and connecting it to the OPUS? Or is it more complicated than that? Now I just have to figure out which wire is which
    Also, what gauge do you think will suffice? would regular speaker wire do?
    Thanks again
    That's what I have found from my questions and searches here. Remove the AC end of of the barrel plug power line, use a multi meter to confirm wire identity (continuity test) after it's been cut. The center inside portion of the barrel as + and the outer as - (in most cases).
    http://gickr.com/results4/anim_5055e...a2b3b197c9.gif
    1990 RHD JDM 300ZX TT 2+2 5sp T-Top
    491RWHP / 18psi / 94 octane

  7. #7
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
    Join Date
    Oct 2004
    Location
    NY
    Posts
    6,234
    14 gauge speaker wire would do fine, but I think your better of getting a small roll of black & red wire, same as speaker wire, radio shack should have it still... will look more "correct" & reduce the chances of hooking it up backwards....

    14 gauge may be a little overkill, but if you ever need 5v up front for something else, it's already there & can support another load... if this doesn't concern you, 16 gauge will be ok...

  8. #8
    Constant Bitrate
    Join Date
    Aug 2006
    Posts
    157
    I've tried hooking up USB thumbdrive on a 5.5m extention cable. Works ok. But when hooking more than 1 usb devise (using a powerd hub, unplugged), it will not work (the light didn't lit up, so I thought it must be a power related issue).

    I haven't tried hooking up a optical drive on the extension though. Maybe if it's powered by some other sources (besides from the USB cable), it will work?

  9. #9
    FLAC
    Join Date
    May 2006
    Location
    Calgary, Alberta
    Posts
    1,718
    I have 2 six foot extensions going from my monitor to my computer in the trunk. Works fine.
    Ampie Case
    2.5" Hard Drive 80GB Samsung 5400RPM
    256 MB DDR2 PC5400
    Xenarc 700TSV - VGA Monitor
    Intel D945GCLF Motherboard
    M2-ATX-HV

    2005 Honda Civic

  10. #10
    _
    Join Date
    Mar 2004
    Location
    Little Elm, Texas
    Posts
    13,500
    Quote Originally Posted by SentraVIP View Post
    I've tried hooking up USB thumbdrive on a 5.5m extention cable. Works ok. But when hooking more than 1 usb devise (using a powerd hub, unplugged), it will not work (the light didn't lit up, so I thought it must be a power related issue).

    I haven't tried hooking up a optical drive on the extension though. Maybe if it's powered by some other sources (besides from the USB cable), it will work?
    Think about how electricity works.

    USB cables don't carry much power down them at all.

    You have to power the hub to get more power down the cable.

    If you're having trouble and are using what should be a powered USB hub, and you're not providing power to it...it's probably a good idea to try and power it.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

Page 1 of 2 12 LastLast

Similar Threads

  1. Powered Hub, Lots of USB Devices! Will this work?
    By adamharrisuk in forum General Hardware Discussion
    Replies: 4
    Last Post: 05-14-2006, 11:00 PM
  2. Queer USB 2.0 Upgrade prob.
    By Nukeb32dc2 in forum General Hardware Discussion
    Replies: 8
    Last Post: 12-22-2005, 05:55 AM
  3. Will this layout with a remote USB hub work?
    By NoPistonPC in forum General Hardware Discussion
    Replies: 14
    Last Post: 08-21-2005, 03:24 PM
  4. Maximum USB length
    By zaid175 in forum General Hardware Discussion
    Replies: 11
    Last Post: 06-14-2005, 03:42 PM
  5. max usb hdd size?
    By hotponyshoes in forum General Hardware Discussion
    Replies: 1
    Last Post: 06-04-2005, 01:14 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •