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802.3cy recently added support for 25 Gb/s: > In addition to the more computer-oriented two and four-pair variants, the 10BASE-T1,[20] 100BASE-T1[21] and 1000B

802.3cy recently added support for 25 Gb/s: > In addition to the more computer-oriented two and four-pair variants, the 10BASE-T1,[20] 100BASE-T1[21] and 1000BASE-T1[22] single-pair Ethernet physical layers are intended for industrial and automotive applications[23] or as optional data channels in other interconnect applications.[24] The single pair operates at full duplex and has a maximum reach of 15 m or 49 ft (100BASE-T1, 1000BASE-T1 link segment type A) or up to 40 m or 130 ft (1000BASE-T1 link segment type B) with up to four in-line connectors. Both physical layers require a balanced twisted pair with an impedance of 100 Ω. The cable must be capable of transmitting 600 MHz for 1000BASE-T1 and 66 MHz for 100BASE-T1. 2.5 Gb/s, 5 Gb/s, and 10 Gb/s over a 15 m single pair is standardized in 802.3ch-2020.[25] In June 2023, 802.3cy added 25 Gb/s speeds at lengths up to 11 m.[26] * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Single-pair https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Sin... 802.3dg is going for 100M and 1000M over distances of 500m

LinuxBender 3y ago
Are there any consumer devices supporting 802.3dg? The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits meaning some network cards have a hard time negotiating at full speed and often fall back to 100mb unless forced
- throw0101a 3y ago
  > Are there any consumer devices supporting 802.3dg? Given that it's not even ratified yet… no.
- ilyt 3y ago
  > The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits meaning some network cards have a hard time negotiating at full speed and often fall back to 100mb unless forced Does it have problems on single unbroken cable like that or it just has few patch-panels along the way ? IIRC the standard was for 100m unbroken cable, not the usual of device -> cable -> patchpanel -> cable ->patchpanel -> cable -> patchpanel -> cable -> device
  - throw0101b 3y ago
    The TIA structured cabling standard assumes patch(5m)+run(90m)+patch(5m): * https://www.youtube.com/watch?v=kNa_IdfivKs&t=11m48s https://www.youtube.com/watch?v=kNa_IdfivKs&t=11m48s * https://www.truecable.com/blogs/cable-academy/maximum-ethernet-cable-length https://www.truecable.com/blogs/cable-academy/maximum-ethern... With the ISO standard the length is strictly informative, and the length of a cable/run doesn't matter as long as the signal characteristics are good: * https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s
  - LinuxBender 3y ago
    Just over 120m 400 ft preformed firewall to firewall between two houses. Sometimes it works better if I turn off EEE. I've tried a few models of firewalls/nics all mini-pc's, all Intel. I think I'm just slightly over the rated length. Using buriable cat-7 in a conduit meant for fiber. Had the conduit run by the same people that installed the fiber.
    - jwiz 3y ago
      I'm sure you considered it, but fiber might fit this application better? Also, AIUI, having the electrical isolation between the 2 buildings is nice.
      - LinuxBender 3y ago
        Fiber would be better. I've indeed contemplated it and may end up going that route.
- throw0101b 3y ago
  > The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits Get a cable tester and see what the cable type/qualtiy and signal characteristics are. Or if you're near some other equipment that is high-EM (where shielding may be needed). There is nothing theoretical about the official numbers with a quality install: * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Variants https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Var... In the ISO/IEC structural cabling standard the length is strictly informative, and the length of a cable/run doesn't matter as long as the signal characteristics are good: you can have a 130m run and a tester will not pass-fail based on the length, but on the signal quality: * https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s
  - LinuxBender 3y ago
    I just have a cheap tester. I've been contemplating getting a better one that can do signal testing. Maybe this is a good excuse to get one.

LinuxBender 3y ago

Are there any consumer devices supporting 802.3dg? The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits meaning some network cards have a hard time negotiating at full speed and often fall back to 100mb unless forced

throw0101a 3y ago
> Are there any consumer devices supporting 802.3dg? Given that it's not even ratified yet… no.
ilyt 3y ago
> The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits meaning some network cards have a hard time negotiating at full speed and often fall back to 100mb unless forced Does it have problems on single unbroken cable like that or it just has few patch-panels along the way ? IIRC the standard was for 100m unbroken cable, not the usual of device -> cable -> patchpanel -> cable ->patchpanel -> cable -> patchpanel -> cable -> device
- throw0101b 3y ago
  The TIA structured cabling standard assumes patch(5m)+run(90m)+patch(5m): * https://www.youtube.com/watch?v=kNa_IdfivKs&t=11m48s https://www.youtube.com/watch?v=kNa_IdfivKs&t=11m48s * https://www.truecable.com/blogs/cable-academy/maximum-ethernet-cable-length https://www.truecable.com/blogs/cable-academy/maximum-ethern... With the ISO standard the length is strictly informative, and the length of a cable/run doesn't matter as long as the signal characteristics are good: * https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s
- LinuxBender 3y ago
  Just over 120m 400 ft preformed firewall to firewall between two houses. Sometimes it works better if I turn off EEE. I've tried a few models of firewalls/nics all mini-pc's, all Intel. I think I'm just slightly over the rated length. Using buriable cat-7 in a conduit meant for fiber. Had the conduit run by the same people that installed the fiber.
  - jwiz 3y ago
    I'm sure you considered it, but fiber might fit this application better? Also, AIUI, having the electrical isolation between the 2 buildings is nice.
    - LinuxBender 3y ago
      Fiber would be better. I've indeed contemplated it and may end up going that route.
throw0101b 3y ago
> The reason I ask is that I often push the limits of current gigabit ethernet distances and have found that actual limits are much shorter than theoretical limits Get a cable tester and see what the cable type/qualtiy and signal characteristics are. Or if you're near some other equipment that is high-EM (where shielding may be needed). There is nothing theoretical about the official numbers with a quality install: * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Variants https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Var... In the ISO/IEC structural cabling standard the length is strictly informative, and the length of a cable/run doesn't matter as long as the signal characteristics are good: you can have a 130m run and a tester will not pass-fail based on the length, but on the signal quality: * https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s https://www.youtube.com/watch?v=kNa_IdfivKs&t=12m32s
- LinuxBender 3y ago
  I just have a cheap tester. I've been contemplating getting a better one that can do signal testing. Maybe this is a good excuse to get one.