On May 18, 2009, at 12:17 PM, Bruce Johnson wrote:
> > > On May 18, 2009, at 9:04 AM, Ken Daggett wrote: > >> >> Thus, plugging in a hub took one "allocation" and each port of >> the hub got one. I have never seen a USB hub with more than >> 4 ports. Seemed to make sense. > > Well it was wrong. > > I have one 5-port and one 7 port USB hub at home. > > You can still buy 7-port USB hubs : > > <http://www.everythingusb.com/belkin_7- > port_plus_usb_2.0_hub_12907.html> If I remember my USB voodoo correctly, the USB standard allocates 100ma to each device that it recognizes on a USB chain, whether or not it needs it. The USB standard calls for a total of 500ma available at each port. So once you have 4 devices plugged into a hub, that is the total of 5. Any more than 4 devices on one UN-POWERED hub, and things MIGHT start to get flaky. That is why most hubs with 5 or 7 (or more) ports come with a wall wart to supply the additional power. As long as you are using powered usb hubs, you can get out to 127 devices. I seem to remember one of the Mac magazines gathered all the usb devices that they could when they got the first iMac, and they hooked up over 20 devices cause that was all they could gather. Len --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com To unsubscribe from this group, send email to g3-5-list-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
