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Experiences with USB hubs? Anyone have serious problems?
Mattiekrome:
Hi all, just a quick question about USB hubs that I would think some of you probably have encounted before.
I'm planning on building a portable CP in the coming month, and would like to have the following plugged into a 7 port USB hub (then all I would have to worry about would be plugging one USB cable into the PC)...
- Ipac2
- USB spinner
- USB trackball
- 4 GB flashdrive
- USB mini keyboard
This may be wishful thinking, but would a 7 port USB hub be able to run all of these without an external power supply? I know about the Milliamp ratings and all that, but I would like first hand accounts of success or failures in this type of setup. I'm trying to avoid having to plug up an AC adapter (in addition to the USB hub) every time I want to play. Also, has anyone gotten any IRQ conflicts while using a setup similar to this? If so, was it an easy fix? Thanks in advance! ;D
divemaster127:
I am some issues like this before I ended up going to a powered hub & it fixed my problems
dm
missioncontrol:
you are going to need to get powered hub...
The keyboard and trackball will most likely pull most of the power
lanman31337:
I had problems with the TOPGUN guns with a crappy usb hub. It would break the port and I'd have to restart.
u_rebelscum:
--- Quote from: Mattiekrome on January 18, 2008, 07:23:05 am ---- Ipac2
- USB spinner
- USB trackball
- 4 GB flashdrive
- USB mini keyboard
This may be wishful thinking, but would a 7 port USB hub be able to run all of these without an external power supply?
--- End quote ---
No, a bus powered (powered through the usb cable from computer) hub is only supposed to support 4 other USB devices. You're trying to hook up 5 devices.
--- Quote ---USB current (related to power) is allocated in units of 100 mA up to a maximum total of 500 mA per port. Therefore a compliant bus powered hub can have no more than four downstream ports and cannot offer more than four 100 mA units of current in total to downstream devices (since one unit is needed for the hub itself). If more units of current are required by a device than can be supplied by the port it is plugged into, the operating system usually reports this to the user.
--- End quote ---
Just power the hub.
--- Quote from: lanman31337 on January 18, 2008, 01:55:31 pm ---I had problems with the TOPGUN guns with a crappy usb hub. It would break the port and I'd have to restart.
--- End quote ---
AFAIK, the topguns are very power hungry, so much so to basically be out of USB spec.