usb 40 meters cable

[+Feb82000]

does any one no were i can get hold of a Rover 200-40 USB isolator / extender with 40m fibre optic cable in inverness  priced one online they are round ?250 i be able to do a live broadcast from any event in the city with this cable

[Jay_7]

Seems like a very slow method of doing things.  The technology behind this cable is basicly two lengths of USB 1.1 with a whopping great Fibre Link in between.  The USB 1.1 kind of defeats what this otherwise great idea could truely be capable of.

Presumably the device that this will be connected to is a camera, now the question is; is the camera USB 2.0 or is it 1.1?  Also presumably this will be getting connected to a PC at the other end.

If my presumptions are correct, have you considered using 1GBps Ethernet equipment?...

[CaleyD]

As it's probably for his ghost hunting equipment then I would assume that he wants to use the fibre optics to reduce the risk of external interference as opposed to the speed issue.

No idea where you would source this locally, especially off the shelf.  I'd suggest looking to buy it from the US as you can normally save yourself quite a bit on stuff like this.

[Jay_7]

So why slow things down anyway by including USB 1.1?... Why not just fit a Fibre link PCI card on the PC and by a specialist camera and make the whole thing fibre link?

If potential interferance is the issue here, a cable is only as good as it's weakest point and for this particular cable, there's still two lengths of USB on there  :017: :024:

[CaleyD]

If money was no object then I would agree with you entirely, but I guess it comes down to practicality and cost.

When using electrical equipment then unless it's in a totally shielded environment then theirs always a risk of noise to/from the equipment itself, a short length of usb cable either end isn't going to add much to that, but a 40 meter span across any distance certainly is.  The best you can do is eliminate as much of that as is possible/practical/affordable.  When it comes to cable I disagree that it's only as good as it's weakest link, certainly in terms of interference where the weakest link is the length.

If the equipment being used is only USB 1.1 then it makes no sense to spend the extra on a USB 2.0 system, especially as many of the USB to Fibre Optic devices for USB 2.0 will not operate with USB 1.1 Equipment.

[Jay_7]

Absolutely in terms of length, the signal will just end up interfering with itself...  :010:  Good gracious that sounds terrible...  :015:

I can appreciate the money is a limiting factor here with Fibre link not exactly cheap but after buying that cable he'll be more than half way to the cost of a complete Fibre link system anyway.

As for the "Cable is only as good as its weakest link" I didn't mean literal links I meant as good as its weakest point.  E.g. Cat5e cable that has been stretched ever so slightly too far so that one of the twisted pairs are not in the same twisted lengths as the other pairs, will only perform at Cat5 speeds because it will be unable to cope with broadband signalling.

A parallel cable with one duff pin on one end will not be able to function well either.

Mixing USB 1.1 and Fibre link will result in a maximum throughput equal to but not over what USB 1.1 is capable of.  I can appreciate that the Fibre in this instance is to eliminate outside interferance and to overcome USB's limited cabling distance but if that is the case then surely the vastly more reliable alternative would be to use Ethernet for the signaling and get a good quality camera that has Ethernet output?

[RiG]

Pair of losers!

[Scotty]

think you did manage to scare feb8 away though  :015: :015:

[Jay_7]