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USB Cables #132157 04/01/05 11:24 PM
Joined: Jul 2002
Posts: 8,263
Trumpy Offline OP
Member
Could someone please tell me if there is a maximum allowable length for USB Accessory cables?.

Tools for Electricians:
Re: USB Cables #132158 04/02/05 12:59 AM
Joined: Jul 2004
Posts: 9,412
G
gfretwell Offline
Member
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.


Greg Fretwell
Re: USB Cables #132159 04/02/05 03:22 AM
Joined: Jul 2003
Posts: 394
B
Big Jim Offline
Member
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.

Re: USB Cables #132160 04/02/05 04:46 AM
Joined: Jul 2002
Posts: 8,263
Trumpy Offline OP
Member
gfretwell, Big Jim,
Thanks for your comments guys!. [Linked Image]
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.

Re: USB Cables #132161 04/02/05 12:09 PM
Joined: Sep 2004
Posts: 93
J
jooles Offline
Member
I believe Sir requires a read of this :-)
http://www.theinquirer.net/?article=22237

Re: USB Cables #132162 04/02/05 06:48 PM
Joined: Jul 2002
Posts: 8,263
Trumpy Offline OP
Member
Wow,
Thanks for that article, jooles. [Linked Image]
Sure makes interesting reading and it's quite funny in places.
Another thing I found there was a link to the USB FAQ . [Linked Image]

Re: USB Cables #132163 04/04/05 02:13 AM
Joined: Jul 2003
Posts: 394
B
Big Jim Offline
Member
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

Re: USB Cables #132164 04/07/05 03:26 AM
Joined: Jul 2002
Posts: 8,263
Trumpy Offline OP
Member
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.

Re: USB Cables #132165 04/09/05 06:53 PM
Joined: Oct 2000
Posts: 2,720
Scott35 Online Happy
Broom Pusher and
Member
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!
Re: USB Cables #132166 04/10/05 10:40 AM
Joined: Oct 2000
Posts: 2,720
Scott35 Online Happy
Broom Pusher and
Member
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!
[Linked Image] [Linked Image] [Linked Image]

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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