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RE: A mere decade after a $gazillion$ remodel....

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Bob_C

In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by AbeCollins on December 12, 2015 at 06:08:15

2 pairs. Ethernet wiring is Ethernet wiring.

Follow Ups:

RE: A mere decade after a $gazillion$ remodel.... - AbeCollins 08:05:59 12/13/15 (8)
2 pairs. Ethernet wiring is Ethernet wiring.

Not really when you consider the history of Ethernet on various media types - RG8 coaxial cable (10Base5), RG58 coaxial cable "thin net" (10Base2), and more recently CAT5/6/7 twisted pair (100Base-T), (1000Base-T), (10GBaseT), SFP+ Twinax , multimode optical fiber , single mode optical fiber, etc.

I was trying to understand and clear up the ambiguity in some of the responses for my own understanding. The devil is in the details.

So as I understand it now the required cabling is:

- All 4 pairs out of the CAT5/6 cable for 1Gbs Ethernet capability (which is what I run)

but

- Only 2 pairs for 100Mbs Ethernet capability

So, if only 100Mbs is required only 2 of the 4 pairs are needed for Ethernet while the remaining pairs can be left unterminated and used elsewhere, for the telephone line(s) as an example.
- RE: A mere decade after a $gazillion$ remodel.... - Bob_C 09:39:07 12/13/15 (7)
  Speaking of twisted pair... All the same. Different wire = higher speeds. or better connections. Why are you bring up coax etc???
  
  Yes you can use a spare pair and long as you do not get any noise or interference. If it is already punched into a keystone Jack just punch one twisted pair of wires to the existing jack and extend it to a new phone jack.
  - http://www.monoprice.com/Category?c_id=105&cp_id=10513&gclid (Open in New Window)
  - RE: A mere decade after a $gazillion$ remodel.... - Ryelands 09:54:32 12/13/15 (6)
    Why are you bring up coax etc???
    
    I assume he proffered a potted history of the relevant cabling technologies to stress the point that 100BaseT uses two pairs (1&2, 3&6 though factory-assembled cables typically terminated all four pairs) while 1000BaseT simply won't work with less than four pairs. Wiki's probably your pal here.
    
    D
    - RE: A mere decade after a $gazillion$ remodel.... - Bob_C 10:00:15 12/13/15 (5)
      I do not believe he was looking to run 1000BaseT.
      - RE: A mere decade after a $gazillion$ remodel.... - AbeCollins 11:43:15 12/13/15 (4)
        
        In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by Bob_C on December 13, 2015 at 10:00:15
        
        All I was asking was for clarification on the number of pairs required for:
        
        100Mbs Ethernet vs 1Gbs Ethernet.
        
        I brought up some historical references along with others in response your comment that Ethernet wiring is Ethernet wiring. .
        
        I'm running 1Gbs Ethernet, all four pairs in use. I got what I need thanks.
        
        RE: A mere decade after a $gazillion$ remodel.... - Bob_C 14:29:22 12/13/15 (3)
        
        In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by AbeCollins on December 13, 2015 at 11:43:15
        
        "Ethernet wiring is Ethernet wiring"
        
        I think it was rather obvious what I was saying. but fine. lol
        
        RE: A mere decade after a $gazillion$ remodel.... - AbeCollins 07:35:09 12/14/15 (0)
        
        In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by Bob_C on December 13, 2015 at 14:29:22
        
        "Ethernet wiring is Ethernet wiring"
        "I think it was rather obvious what I was saying. but fine. lol "
        No, it wasn't obvious. That says nothing about how many pairs are needed for 100Mbs vs 1Gbs Ethernet. As I mentioned earlier, I was trying to cut through the ambiguity in the responses like... "Ethernet wiring is Ethernet wiring".
        
        Edits: 12/14/15
        
        RE: A mere decade after a $gazillion$ remodel.... - Rod M 20:05:16 12/13/15 (1)
        
        In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by Bob_C on December 13, 2015 at 14:29:22
        
        But Gigibit does require all 4 pairs and better cable. Two pairs work up to 100Mbps. I was wrong thinking that the ethernet standard applied to gigabit standard that use the other pairs.
        
        -Rod
        
        RE: A mere decade after a $gazillion$ remodel.... - Bob_C 20:35:52 12/13/15 (0)
        
        In Reply to: RE: A mere decade after a $gazillion$ remodel.... posted by Rod M on December 13, 2015 at 20:05:16
        
        You know I actually never though about it because everyone always connects all 8 wires. I never bothered to check either, but yes gig does use all the pairs. Let's hope we did not just blow up Abe's house. Ethernet cables can be explosive if not connected correctly.

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