There's no such thing.
Safeguarding radius when installing cables
- Thread starter Anthony-C
- Start date
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Not sure if this is the one but it seems to require 70mm...
www.protelturkey.com/urunler/belden/pdf/H125_CU_PE.pdf
If the foil is aluminium and the sheath PVC then the minimum bend radius is 35mm
http://www.protelturkey.com/urunler/belden/pdf/H125_AL_PVC.pdf
If copper foil and PE sheath then it is 70mm
http://www.protelturkey.com/urunler/belden/pdf/H125_AL_PVC.pdf
If copper foil and PE sheath then it is 70mm
If that two-fold difference is dependent only on the materials used for the foil and sheath, doesn't it beg the question as to what this 'minimum radius' is actually all about?
Kind Regards, John.
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I realise that, but I thought (maybe wrongly) that the rule of thumb was that one should not expect/try to get a bitrate much more than three times the bandwidth - i.e. something like 300 Mbps for a bandwidth of 100 MHz for cat5/cat5e.
Kind Regards, John
Will it? I'm sure 1Gb requires a minimum of cat5e?
If you look back through this thread, you'll see that I have acknowledged that cat5 cable is used, apparently successfully, for 1 Gbps - but that I am amazed that this works over any significant distance (particularly with some of the terminations used) and feel that this speed must be 'pushing the limit' of the capabilities of cat5/cat5e cable.
I also wonder how many people who think they are getting 1 Gbps in domestic installations really are; as has been pointed out, the hardware/firmware will usually autoswitch to a slower speed when necessary. .. and also wonder whether (and, if so, why) anyone really needs such a speed in a domestic environment.
The other thing which has been absent from this discussion is any consideration of length of cables, which is a crucial part of the equation, as it is for any transmission line. With short paths, such as will often be the case domestically, it's obviously much easier to get high data transfer rates.
Kind Regards, John.
Uploading simultaneous HD CCTV signals to a NAS could be one.....
I plan to setup a gigabit network in my house as I'm looking have a central server and pull files off it.
I suppose that could be one reason - but it's hardly a common domestic requirement
I have such a network, with the server serving about a dozen computers in a very large house, but 100 mpbs seems to do fine for that, at least for me.
Kind Regards, John.
More and more homes are now getting CCTV though.
I think the point is if you're going to go to all the expense and hassle of fitting a network system, seems silly to not go that little bit extra and make it gigabit compliant.
I often tend to work with files of the 100s mb size so at non gigabit speeds would take forever and like I said, seems silly not to get the most out of the kit you're installing.
Sometimes the data travelling over an over engineered network is like a Ford Zodiac being driven round a Formula One race track. Slow and keeps breaking down if driven flat out.
It not un-common to find that slowing the data bit rate results in faster file transfer as less pakets are corrupt and far fewer repeats are needed.
It not un-common to find that slowing the data bit rate results in faster file transfer as less pakets are corrupt and far fewer repeats are needed.
True, although multichannel HD CCTV must be pretty rare domestically.
I can't argue with the concept of having a somewhat future-proof infrastructure - but, as has been said, properly installed cat5 cable is theoretically OK for 1 Gbps, and it would be reasonable to instal to that capability (with tthe future in mind, if nothing else).
One thing to watch with attempts at future-proofing is that the technology is changing so rapidly. In 10 years time,we might all be using optical cables rather than TP ones, so even cat8 might then be obsolete. ... and, of course, 'state of the art' things are often very expensive until 'the future' comes and they become the high-volume-sales norm. I once filled my house with 'thick ethernet' cables, at quite appreciable cost.
If you frequently have to move files that large, then maybe you do have that need, but I'd suggest that is also a pretty rare domestic situation. After all, with a network actually functioning at just 100 Mbps, one can theoretically shift at the rate of about 100 MB every 8 seconds, which is good enough for most people. Furthermore, as I said before, I wonder how many 'gigabit installations' actually achieve anything like that speed in practice; as Bernard has suggested, with imperfect infrastructure, and the consequent need for a lot of error correction (or even auto-switching to lower speeds), 'more haste can mean less speed'!
Kind Regards, John.
No-one has contradicted you B-A-S... no... so thanks for the wisdom. I suppose I should route on the inside if possible until up out of harms way.
Whilst it may well be true that nothing is actually sold as 'exterior trunking', there is obviously any number of ways that one could cover/protect/'hide' cables on external walls.
Kind Regards, John.
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