[TechAssist] Re: usb headers
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 2 Aug 2004 15:41:52 -0500
The following is pasted from the Sony Networking training course. No pinout
is given in the manual, however I seem to recall that the wires go straight
through, that is 1 to 1, 5 to 5.
-----------insert-----------
FIGURE 1-3 - USB CONNECTORS
Wires
The five-conductor USB wire contains a twisted pair of wires for the data (+
and - differential signal with
respect to ground) and a pair of wires for power. These four wires are
enveloped in the ground shield (fifth
wire). The maximum length of a USB cable is 16 feet.
FIGURE 1-3 - USB CONNECTORS
4
1. Universal Serial Bus (USB)
Power
Power (5Vdc) is supplied either from the host PC or from the hub to the
portable device (which may alternately be
self-powered (diode blocked)). The current is limited to 500 ma per device.
The total supply current is limited to
5 Amps. Since there are only four pins, the cable is thin and connectors are
small, which helps reduce the cost
and allows cheaper peripheral devices to be developed.
Connections
The connection of multiple USB local devices requires one or more hubs, as
shown in Figure 1-2. Up to 127 local
USB devices may be added to the computer in this manner.
-------------end insert---------------
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: "Barry Thompson" <barrystv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 02, 2004 11:23 AM
Subject: [TechAssist] usb headers
> Hi: Anyone know how to figure our the pinouts for the front usb
connectors?
> I have 2 headers 9 pin each for usb 1 and usb 2. There are four wires for
> each header. 5 volts,ground,postive signal,negative signal.Thanks Barry
> Barrys TV
> barrystv@xxxxxxx
> Ottawa
> Canada
>
>
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