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#132157 - 04/01/05 08:24 PM USB Cables
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Could someone please tell me if there is a maximum allowable length for USB Accessory cables?.
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#132158 - 04/01/05 09:59 PM Re: USB Cables
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I think it is 6' but I have 2 chained together (12') for a mouse and it works fine... but that is not a very demanding load.
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#132159 - 04/02/05 12:22 AM Re: USB Cables
Big Jim Offline
Member

Registered: 07/18/03
Posts: 377
Loc: Denver, CO USA
15 m ones are readily available and I've put 2 of those together without trouble. At work, we have slow devices (mouse, keyboard) running on about 75 feet. They did tend to fail when they tried 100 feet in development.
Hubs are usually repeaters so, if you have a special need for distance, just add a hub every 30 to 50 feet.

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#132160 - 04/02/05 01:46 AM Re: USB Cables
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
gfretwell, Big Jim,
Thanks for your comments guys!.
I was wondering this because I'm looking to move my Web-cam a bit further away from the computer and I was wondering what sort of distance I could get away with.
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#132161 - 04/02/05 09:09 AM Re: USB Cables
jooles Offline
Member

Registered: 09/18/04
Posts: 98
Loc: brussels, belgium
I believe Sir requires a read of this :-)
http://www.theinquirer.net/?article=22237

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#132162 - 04/02/05 03:48 PM Re: USB Cables
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Wow,
Thanks for that article, jooles.
Sure makes interesting reading and it's quite funny in places.
Another thing I found there was a link to the USB FAQ .
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#132163 - 04/04/05 12:13 AM Re: USB Cables
Big Jim Offline
Member

Registered: 07/18/03
Posts: 377
Loc: Denver, CO USA
When I went back and looked at my reply, I noticed a mistake. should have been 3 m (15 foot) for a total of 30 feet for my personal run.

Sorry

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#132164 - 04/07/05 01:26 AM Re: USB Cables
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Scott35,
I have an idea that you posted a thing about the actual USB plug configuration?.
Is it a 5V system or 12V DC?.
I realise that there are 2 data wires too.
Could you please re-post the protocol?.
Cheers,
Mike.
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#132165 - 04/09/05 04:53 PM Re: USB Cables
Scott35 Offline

Broom Pusher and
Member

Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
Mike (Trumpy);

I remember the thread, just cannot find it through simple searching.

I'll post protocols later today.

Scott35

message in reference to this post:

 Quote:

Scott35,
I have an idea that you posted a thing about the actual USB plug configuration?.
Is it a 5V system or 12V DC?.
I realise that there are 2 data wires too.
Could you please re-post the protocol?.
Cheers,
Mike.
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

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#132166 - 04/10/05 08:40 AM Re: USB Cables
Scott35 Offline

Broom Pusher and
Member

Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA
Mike (Trumpy);

Here's the typical USB Cable Connector Pinout information:

PIN # 1: + 5 VDC ( Vcc ),
PIN # 2: - DATA ( D- ),
PIN # 3: + DATA ( D+ ),
PIN # 4: GROUND ( GND )

4-PIN MALE at the Controller,
4-PIN FEMALE at the Peripheral

Upstream / Series "A" Connector is the thin, rectangular one.
Downstream / Series "B" Connector is the one with the 45┬░ angles at the top.

Pinouts should be equal for IEEE 1392 "Firewire"

USB Devices communicate over the Bus via typical Packets, and of course, a group of Packets doing something useful is a Bus Transaction.
Interestingly, the USB network functions like IBM's Token Ring - only without the ring (ring in/ring out at MSAUs).
A device is given permission to communicate on the Bus when it receives a Token.

127 maximum nodes (devices).
Two different device speeds - 12 MBPS or 1.5 MBPS - both speeds may be used on the same network, so devices of either speed may be used together.

Found a gazillion other pinouts - like almost every connector / adapter (bus card or SIMM/DIMM) that can be found on Computers - be it an IBM type or Mac.
Would be great to compile this data ... also would be great to win $1,000,000.00 at the Poker Tables in Vegas; so let's see what happens first!


Let me know if you have additional Q's (Questions).

Scott35
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

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