USB connectors any differences?

[DJW]

I have two powered USB hubs one is hard wired and the other connects
from the computer with a small USB plug at the hub. My USB wired
keyboard will only work with the hard-wired hub. Is there a difference
in the connector types as in pins not present in the mini as opposed
to the regular type? Is there a difference between the USB types of
plugs like there is with Firewire 6 vs. 4 pins? Are they called USB
type A, B, mini and micro? I think the one I am speaking of on the
seven port USB is a mini.

 

[GlowingBlueMist]

I have two powered USB hubs one is hard wired and the other connects
from the computer with a small USB plug at the hub. My USB wired
keyboard will only work with the hard-wired hub. Is there a difference
in the connector types as in pins not present in the mini as opposed
to the regular type? Is there a difference between the USB types of
plugs like there is with Firewire 6 vs. 4 pins? Are they called USB
type A, B, mini and micro? I think the one I am speaking of on the
seven port USB is a mini.

From what I've read there is nothing different about the USB connectors
other than the size.

I have run into cables that are configured to supply just data and not the 5
volts while a few were just the opposite, they only had power and ground
hooked up to charge something, like a USB cable designed to plug into a 5
volt wall transformer.

Not all ports meet the USB standard with regards to supplying enough power
on the 5 volt connection. For example, a non-powered hub will try to
divide the power from it's one connection to the PC to all of it's ports
making them problematical with devices that need power, like keyboards or
small external drives. A powered hub gets it's 5 volts from a source that
has enough power to drive all ports, if everything is designed correctly, so
that none of them are short of power.

Check out these links for more information about the USB pinouts.
http://pinouts.ru/SerialPortsCables/usb_cable_pinout.shtml
http://www.interfacebus.com/usb-cable-diagram.html