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Forums › New Zealand Connections › Renovating & Re-wiring
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502 posts

Ultimate Geek

Subscriber
  Reply # 667709 5-Aug-2012 10:32 Send private message

cyril7: Like speaker cable, each conductor of the pair is in its own sheath and the two a molded together like a figure 8 as shown below.

http://www.surplustronics.co.nz/shop/cat560.html

Modern 2 pair is a single black sheath with the 4wires (in two pairs) inside, so it looks a bit like TV coax from the outside.

Cyril


Thanks, but your link doesn't work.

From your description I think I recall that type of cable: it was twisted like a helix and came from the street telephone pole to the house. Am I correct?

5677 posts

Uber Geek

Trusted
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  Reply # 667710 5-Aug-2012 10:35 Send private message

Hi, I have fixed the link if you retry, and yes it does sometimes helix depending on how it comes off the drum.

Cyril

361 posts

Ultimate Geek

Subscriber
  Reply # 667775 5-Aug-2012 13:33 Send private message

cyril7: 

Cat3 (which is what the white cabling in your house is, is rated and characterised to 10Mhz, cat5e to 100MHz, cat6 to 250MHz and cat6a to 500MHz.

Bandwidth usage wise Phone/voice uses 0.04MHz, ADSL2+ uses 2MHz, VDSL2 uses typically 12MHz but can extend to 30MHz, FastEthernet (100Mb/s) uses a 31MHz centre spectrum with sidelobes extending to just beyond 60MHz, GigE (1000Mb/s) ethernet uses 62MHz carrier with sidelobes extending to just over 100Mhz. Cat5e and Cat6 are rated to carry all those signals to the full 100Metres, cat6 will carry 10GigE to 37m and cat6a is rated to carry 10GigE to 100m. So as you can see, all you need is cat5e, but cat6 if you must.




Just reading this thread and getting my head around it; the above read in isolation makes it sound like if you are getting VDSL2 you should be running at least Cat5e internally.

I read another thread where you've said cat3 is what these technologies are designed for (and run over for the distance between the cabinet and your house) so running cat5e for the last ~40m in your house won't make a difference.

If I understand correctly, the 30MHz is only for profile 30a, whereas here we are either 8a or 17a which is 8 or 17MHz respectively. So the question - assuming you are close enough for the 17a profile in the first place, is there likely to be any measurable difference between using cat3 from a splitter to a dedicated jackpoint, compared to >= cat5e?

587 posts

Ultimate Geek
  Reply # 667796 5-Aug-2012 15:23 Send private message

blair003:
cyril7: 

Cat3 (which is what the white cabling in your house is, is rated and characterised to 10Mhz, cat5e to 100MHz, cat6 to 250MHz and cat6a to 500MHz.

Bandwidth usage wise Phone/voice uses 0.04MHz, ADSL2+ uses 2MHz, VDSL2 uses typically 12MHz but can extend to 30MHz, FastEthernet (100Mb/s) uses a 31MHz centre spectrum with sidelobes extending to just beyond 60MHz, GigE (1000Mb/s) ethernet uses 62MHz carrier with sidelobes extending to just over 100Mhz. Cat5e and Cat6 are rated to carry all those signals to the full 100Metres, cat6 will carry 10GigE to 37m and cat6a is rated to carry 10GigE to 100m. So as you can see, all you need is cat5e, but cat6 if you must.




Just reading this thread and getting my head around it; the above read in isolation makes it sound like if you are getting VDSL2 you should be running at least Cat5e internally.

I read another thread where you've said cat3 is what these technologies are designed for (and run over for the distance between the cabinet and your house) so running cat5e for the last ~40m in your house won't make a difference.

If I understand correctly, the 30MHz is only for profile 30a, whereas here we are either 8a or 17a which is 8 or 17MHz respectively. So the question - assuming you are close enough for the 17a profile in the first place, is there likely to be any measurable difference between using cat3 from a splitter to a dedicated jackpoint, compared to >= cat5e?


It may not have any actual difference compared to cat5e, but cat5e is cheep as chips and easier to work with

361 posts

Ultimate Geek

Subscriber
  Reply # 667807 5-Aug-2012 15:49 Send private message

Yeah for sure, I was asking from a slightly different angle.

I had some wiring done to get cat5e from my lounge and master bedroom to a central cupboard. The cupboard now has a broadband jack, modem, router/wifi point, gigabit switch and my NAS (previously all of this equipment was in the lounge and from the master bedroom I would be lucky to get 20Mbit over wifi, now I get 1000Mbit)

My house had an existing cat3 cable that went from the splitter to the lounge for a broadband jack. The cupboard is between the splitter and the lounge, so rather than run a new cat5e from the splitter to the cupboard, we just used the cat 3 that had been going to the lounge but terminated it to the cupboard instead.

I am wondering if there would be any benefit to having run a cat5e from the splitter instead of re-using the cat3. It's less than 15meters so I didn't think it mattered, but I'm moving to VDSL2 currently so now I'm wondering.

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