D70 USB cord - longer alternatives for tethered ?

Nigel_Anscombe · #8 11-06-2004, 04:38 PM

Hi All,

Funny, I was was just looking at a similar post on another Photgraphic forum. What I did find was this interesting page about USB:

http://www.usb.org/faq/ans5

The useful paragraphs say

[ QUOTE ]
Q3: How far away from a PC can I put a USB device?
A3: With the maximum of 5 hubs connected with 5m cables and a 5m cable going to your full speed device, this will give you 30m of cable (see section 7.1.19 for details). With a low speed device, you will be able to get a range up to 27m, depending on how long the device's cable is. With a straightforward cable route, you will probably be able to reach out 25m or so from the PC.

[/ QUOTE ]

[ QUOTE ]
Q4: I need to put a USB device X distance from my PC. What do I do?
A4: If X is less than 25m or so (see previous question), buy a bunch of hubs and connect them serially with 5m cables. If you need to go farther than that, put another PC, or maybe a laptop, out where you need the device to be and network it with the first PC using something that's intended to be a long-range connection, such as Ethernet or RS-485. If you need to use nothing but USB, consider using USB based Ethernet adapters to hook the PCs together.

[/ QUOTE ]

I hope this is useful.

Regards
Nigel

Eric_llasenko · #9 11-07-2004, 05:23 AM

Got the highest quality 6 foot extension and it has seemed to work fine with my original 4 foot d70 cord with no noticable loss of speed or images. The USB extension package warns that 10 feet is the limit for some devices, so I went with the 6 footer and 10 feet is more than enoungh to prevent me from pulling the laptop down on me if I am shooting little ones from the floor level hand held...