4 ms·

This would be so much nicer if it was SFP+, 10GBASE-T transceivers are too expensive still IMO.

sschueller 5y ago
? They are like $20 for single mode fiber which you can run for miles. https://www.fs.com/de-en/products/11555.html https://www.fs.com/de-en/products/11555.html
- ZiiS 5y ago
  Exactly. If it was SPF+ you could use that. As it is copper only you need to buy a more expensive (and for most uses less good) copper one for whatever you plug it into.
  - TheSpiceIsLife 5y ago
    I think you mean SFP+, small form-factor pluggable, rather than Sun Protection Factor ;)
    - sschueller 5y ago
      I make that mistake as well, Sender Permit From...
  - sschueller 5y ago
    Copper SPF+ get very hot and waste a ton of electricity. I think doing anything over 2.5G on copper is not ideal.
    - stefan_ 5y ago
      That's really the big reason you don't see more of 10 GbE - over copper it's kind of terrible technology and you should really use fiber. But that's a big jump, so people stay at 1/2.5 GbE.
jagrsw 5y ago
They're 50USD or so. The main problem seems to be that they use ~3-4W of power each, and it's more than power budget of a single SFP/+ slot (2W or so), and they become v.hot (~70°C), what can lead to overheating of switches.
- ericd 5y ago
  Yeah, the mikrotiks recommend populating only every other slot if you're using RJ45 transceivers to avoid overheating.
  - aix1 5y ago
    Is the power consumption (and heat dissipation) a function of bit rate? E.g. would the same 10GBASE-T transceiver consume less power when running at, say, 2.5Gb/s than at 10Gb/s? Would love to understand this a bit better. (edit: corrected the units.)
    - jagrsw 5y ago
      Seems so, e.g. this table: https://www.ioi.com.tw/products/proddetail_mobile.aspx?CatID=106&DeviceID=3035&HostID=2069&ProdID=1060194 https://www.ioi.com.tw/products/proddetail_mobile.aspx?CatID... Power consumption (Full bidirectional traffic, 100m cable): 10G speed: 6.41W 5G speed: 4.83 W 2.5G speed: 3.97W 1G speed: 2.94W 100M speed: 2.21W Also https://en.wikipedia.org/wiki/Energy-Efficient_Ethernet https://en.wikipedia.org/wiki/Energy-Efficient_Ethernet
    - zamadatix 5y ago
      Yes (or at least I've noticed it on mine) but worth noting 99% of 10G RJ45 SFP+ transceivers only support 10G and nothing else. Typically it's only fixed copper interfaces that support negotiating different speeds. The MikroTik adapters are a bit special in that they are more a 2 port transparent bridge where the inside facing portion of the module always runs at 10g and the outside facing portion auto-negotiates. This allows 10G only switch interfaces to support 10/100/1000/2500/5000/10000 clients. In a MikroTik switch it reports back the negotiated speed and the switch can shape traffic to the appropriate bandwidth instead of letting the adapter do it (which I assume is just policed but could be wrong, never tested). I have a 100G switch which is backwards compatible with 40G and allows breakouts so with a QSA can support SFP+ modules... putting this MikroTik module in I can plug a 10 megabit half duplex device into a 100 gigabit port!

? They are like $20 for single mode fiber which you can run for miles. https://www.fs.com/de-en/products/11555.html https://www.fs.com/de-en/products/11555.html

ZiiS 5y ago
Exactly. If it was SPF+ you could use that. As it is copper only you need to buy a more expensive (and for most uses less good) copper one for whatever you plug it into.
- TheSpiceIsLife 5y ago
  I think you mean SFP+, small form-factor pluggable, rather than Sun Protection Factor ;)
  - sschueller 5y ago
    I make that mistake as well, Sender Permit From...
- sschueller 5y ago
  Copper SPF+ get very hot and waste a ton of electricity. I think doing anything over 2.5G on copper is not ideal.
  - stefan_ 5y ago
    That's really the big reason you don't see more of 10 GbE - over copper it's kind of terrible technology and you should really use fiber. But that's a big jump, so people stay at 1/2.5 GbE.

jagrsw 5y ago

They're 50USD or so. The main problem seems to be that they use ~3-4W of power each, and it's more than power budget of a single SFP/+ slot (2W or so), and they become v.hot (~70°C), what can lead to overheating of switches.

ericd 5y ago
Yeah, the mikrotiks recommend populating only every other slot if you're using RJ45 transceivers to avoid overheating.
- aix1 5y ago
  Is the power consumption (and heat dissipation) a function of bit rate? E.g. would the same 10GBASE-T transceiver consume less power when running at, say, 2.5Gb/s than at 10Gb/s? Would love to understand this a bit better. (edit: corrected the units.)
  - jagrsw 5y ago
    Seems so, e.g. this table: https://www.ioi.com.tw/products/proddetail_mobile.aspx?CatID=106&DeviceID=3035&HostID=2069&ProdID=1060194 https://www.ioi.com.tw/products/proddetail_mobile.aspx?CatID... Power consumption (Full bidirectional traffic, 100m cable): 10G speed: 6.41W 5G speed: 4.83 W 2.5G speed: 3.97W 1G speed: 2.94W 100M speed: 2.21W Also https://en.wikipedia.org/wiki/Energy-Efficient_Ethernet https://en.wikipedia.org/wiki/Energy-Efficient_Ethernet
  - zamadatix 5y ago
    Yes (or at least I've noticed it on mine) but worth noting 99% of 10G RJ45 SFP+ transceivers only support 10G and nothing else. Typically it's only fixed copper interfaces that support negotiating different speeds. The MikroTik adapters are a bit special in that they are more a 2 port transparent bridge where the inside facing portion of the module always runs at 10g and the outside facing portion auto-negotiates. This allows 10G only switch interfaces to support 10/100/1000/2500/5000/10000 clients. In a MikroTik switch it reports back the negotiated speed and the switch can shape traffic to the appropriate bandwidth instead of letting the adapter do it (which I assume is just policed but could be wrong, never tested). I have a 100G switch which is backwards compatible with 40G and allows breakouts so with a QSA can support SFP+ modules... putting this MikroTik module in I can plug a 10 megabit half duplex device into a 100 gigabit port!