Results 1 to 8 of 8

Thread: Using Cat6 as DSL Cable?

  1. #1
    Senior Member
    Join Date
    Feb 2011
    Location
    Lancashire
    Posts
    741
    Thanks
    11
    Thanked
    20 times in 19 posts
    • PowerPie5000's system
      • Motherboard:
      • Asrock X99 Taichi
      • CPU:
      • Intel Core i7 6850K
      • Memory:
      • 16GB HyperX Fury DDR4 2666 (4x4GB Quad Channel)
      • Storage:
      • 250GB Crucial MX200 SSD + 2TB Toshiba SATA HDD
      • Graphics card(s):
      • 8GB MSI RX580 Gaming X
      • PSU:
      • 750W Riotoro Enigma G2 Modular PSU (Seasonic Focus Plus Gold).
      • Case:
      • AeroCool Dead Silence 230
      • Operating System:
      • Windows 10 64-bit
      • Monitor(s):
      • AOC G2590FX 24.5" 144Hz Freesync
      • Internet:
      • TalkTalk Faster Fibre Boost

    Using Cat6 as DSL Cable?

    Hi all,

    I want to replace the thin and flimsy 4m DSL cable that came with my FritzBox router for something shorter and of better quality.

    My question is, can I use a standard cat6/7 patch lead as the connection between my router and the filtered VDSL wall socket? The VDSL socket accepts both RJ45 and RJ11 type connectors and my router has an RJ45 port for VDSL/WAN (not RJ11 as you commonly find on routers).

    I've seen some good quality DSL cables that have an Rj45 on one end and RJ11 on the other, but they state the RJ11 is for the router end and Rj45 for the wall socket.... Are they reversable so I can use it the other way around?

    I've never really looked too much in to cable details before.

    Cheers!

  2. #2
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,040
    Thanks
    2,755
    Thanked
    3,299 times in 2,611 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Using Cat6 as DSL Cable?

    There really isn’t any point in using cat 6 or above for that short length, cat5e is more flexible and will do the job just as well.

    But really, because it is a short length the cable that came with the router will be fine - I doubt you will notice any difference in speed or latency.

    Only two cores carry the dsl signal so if you did use an rj11/rj45 cable you would need to ensure that the correct pins are connected. You are unlikely to cause damage if they aren’t - it just won’t work.
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

  3. #3
    Senior Member
    Join Date
    Feb 2011
    Location
    Lancashire
    Posts
    741
    Thanks
    11
    Thanked
    20 times in 19 posts
    • PowerPie5000's system
      • Motherboard:
      • Asrock X99 Taichi
      • CPU:
      • Intel Core i7 6850K
      • Memory:
      • 16GB HyperX Fury DDR4 2666 (4x4GB Quad Channel)
      • Storage:
      • 250GB Crucial MX200 SSD + 2TB Toshiba SATA HDD
      • Graphics card(s):
      • 8GB MSI RX580 Gaming X
      • PSU:
      • 750W Riotoro Enigma G2 Modular PSU (Seasonic Focus Plus Gold).
      • Case:
      • AeroCool Dead Silence 230
      • Operating System:
      • Windows 10 64-bit
      • Monitor(s):
      • AOC G2590FX 24.5" 144Hz Freesync
      • Internet:
      • TalkTalk Faster Fibre Boost

    Re: Using Cat6 as DSL Cable?

    Would a standard cat5e cable with rj45 connectors at both ends work fine even if all the pins don't get used? I was looking at getting some shielded cable as the current 4 metre long DSL cable affects the upload/download speed slightly when I move it. I've tried rolling it up and also leaving it unwound and it affected the data speeds and the SNR slightly according to the routers DSL info page. I think a short and shielded cable should help a bit.... The cable that came with the FritzBox is pretty thin and flimsy (cheap).

  4. #4
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,040
    Thanks
    2,755
    Thanked
    3,299 times in 2,611 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Using Cat6 as DSL Cable?

    Yes, that should work. The pins are connected 1:1 2:2 etc (provided you haven’t got a crossover cable - and they are quite rare in these days of auto-detection switches and router)
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

  5. #5
    root Member DanceswithUnix's Avatar
    Join Date
    Jan 2006
    Location
    In the middle of a core dump
    Posts
    9,642
    Thanks
    473
    Thanked
    987 times in 839 posts
    • DanceswithUnix's system
      • Motherboard:
      • Asus X470-PRO
      • CPU:
      • 2600X
      • Memory:
      • 16GB 3200MHz
      • Storage:
      • 1TB Linux, 1TB Games (Win 10)
      • Graphics card(s):
      • Asus Strix RX Vega 56
      • PSU:
      • 650W Corsair TX
      • Case:
      • Antec 300
      • Operating System:
      • Fedora 28 + Win 10 Pro 64 (yuk)
      • Monitor(s):
      • Benq XL2730Z 1440p + Samsung 2343BW 2048x1152
      • Internet:
      • Zen 80Mb/20Mb VDSL

    Re: Using Cat6 as DSL Cable?

    The shielding isn't so important, those RJ11 "modem" cables aren't usually twisted pair which is supposed to make the big improvement.

    I have used Cat 5 in the past for ADSL (not even 5e, hence the office were throwing the reel out). Actually rewired the phone extensions with the stuff as the router was really hard to locate near the phone master socket. It made a big difference, but then I was also on more than 4m of cable.

    From memory, you only use the pair in the middle on an RJ11. Looking at an ethernet connection diagram:



    the middle pins there are indeed a pair, so it should work. In my current house, I took the front plate off the filtered master socket and used the two push down IDC connections inside with the plug cut off. But then I had to cut the plug off to go through a wall, so it seemed easier than crimping another plug on but it is another option that isn't obvious unless you have removed the faceplate.

    Not using all the connections is fine, as long as the two you are using are a pair (or you will get really awful performance).

  6. #6
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,040
    Thanks
    2,755
    Thanked
    3,299 times in 2,611 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Using Cat6 as DSL Cable?

    That is the T568A standard. Most common patch cables are wired T568B. The only difference is that the orange and green pairs are swapped - they are still wired 1:1, 2:2 etc but pin 1 will be orange/white, pin 2 orange, pin 3 green/white etc. Only an issue if you are going to re-terminate a patch cable.
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

  7. #7
    root Member DanceswithUnix's Avatar
    Join Date
    Jan 2006
    Location
    In the middle of a core dump
    Posts
    9,642
    Thanks
    473
    Thanked
    987 times in 839 posts
    • DanceswithUnix's system
      • Motherboard:
      • Asus X470-PRO
      • CPU:
      • 2600X
      • Memory:
      • 16GB 3200MHz
      • Storage:
      • 1TB Linux, 1TB Games (Win 10)
      • Graphics card(s):
      • Asus Strix RX Vega 56
      • PSU:
      • 650W Corsair TX
      • Case:
      • Antec 300
      • Operating System:
      • Fedora 28 + Win 10 Pro 64 (yuk)
      • Monitor(s):
      • Benq XL2730Z 1440p + Samsung 2343BW 2048x1152
      • Internet:
      • Zen 80Mb/20Mb VDSL

    Re: Using Cat6 as DSL Cable?

    Quote Originally Posted by peterb View Post
    That is the T568A standard. Most common patch cables are wired T568B. The only difference is that the orange and green pairs are swapped - they are still wired 1:1, 2:2 etc but pin 1 will be orange/white, pin 2 orange, pin 3 green/white etc. Only an issue if you are going to re-terminate a patch cable.
    The point was that the middle two are a twisted pair, the colours indicating which terminals are paired and twisted together down the cable. You can even wire the two the wrong way around, the modem uses high frequency AC signals and should be designed to not care about a flip in polarity (ie the 50V DC voltage should be blocked, and the maths works out the same), but if the two conductors aren't twisted around each other you may as well stick with the existing cable.

  8. #8
    Admin team peterb's Avatar
    Join Date
    Aug 2005
    Location
    Southampton
    Posts
    19,040
    Thanks
    2,755
    Thanked
    3,299 times in 2,611 posts
    • peterb's system
      • Motherboard:
      • Nascom 2
      • CPU:
      • Z80B
      • Memory:
      • 48K 8 bit memory on separate card
      • Storage:
      • Audio cassette tape - home built 5.25" floppy drive
      • Graphics card(s):
      • text output (composite video)
      • PSU:
      • Home built
      • Case:
      • Home built
      • Operating System:
      • Nas-sys
      • Monitor(s):
      • 12" monocrome composite video input
      • Internet:
      • No networking capability on this machine

    Re: Using Cat6 as DSL Cable?

    I know, but if theOP isn’t familiar with the technology, the difference in colour coding might be confusing.

    No criticism of your description was implied or intended!
    (\__/)
    (='.'=)
    (")_(")

    Been helped or just 'Like' a post? Use the Thanks button!
    My broadband speed - 750 Meganibbles/minute

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •