Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 
1345 posts

Uber Geek
+1 received by user: 285

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?

5971 posts

Uber Geek
+1 received by user: 109

Trusted
Subscriber

  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

384 posts

Ultimate Geek
+1 received by user: 4

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?

870 posts

Ultimate Geek
+1 received by user: 73

Subscriber

  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

384 posts

Ultimate Geek
+1 received by user: 4

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.

1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





Trending now »

Hot discussions in our forums right now:

How good is your general Science Knowledge?
Created by Aredwood, last reply by joker97 on 31-Oct-2014 23:44 (39 replies)
Pages... 2 3


Government Limos
Created by networkn, last reply by Bung on 31-Oct-2014 12:39 (94 replies)
Pages... 5 6 7


Snap refuses to replace faulty gear
Created by Brendan, last reply by MadEngineer on 28-Oct-2014 19:07 (92 replies)
Pages... 5 6 7


Sky will be 'upgrading software' of My Sky to connect to internet. What does that mean?
Created by Geektastic, last reply by NonprayingMantis on 31-Oct-2014 23:55 (27 replies)
Pages... 2


Shutup and take my money (via NFC on my mobile phone)
Created by sxz, last reply by sonyxperiageek on 31-Oct-2014 22:34 (24 replies)
Pages... 2


Speed limit when overtaking? Teach me please.
Created by nakedmolerat, last reply by joker97 on 28-Oct-2014 17:13 (123 replies)
Pages... 7 8 9


Uber: a cheaper taxi ride?
Created by kingdragonfly, last reply by livisun on 31-Oct-2014 14:47 (34 replies)
Pages... 2 3


OneDrive code giveaway - go!
Created by freitasm, last reply by pgsheng on 1-Nov-2014 01:50 (33 replies)
Pages... 2 3



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.