5 ms·
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, 2.5G
by 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 agoSeems 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 agoYes (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!
- aix1 5y agoSuper interesting re Mikrotik adapters. Those (S+RJ10) are exactly what I run, so very relevant, thank you!
- jagrsw 5y agoI think it's a mixed bag of cats, the support for 2.5/5/10G - somebody made an useful table for that: https://www.servethehome.com/wp-content/uploads/2020/03/STH-10Gbase-T-Converter-Testing-Summary-Table-2.5-5-10GbE-and-Jumbo-Frames.jpg https://www.servethehome.com/wp-content/uploads/2020/03/STH-... The whole article: https://www.servethehome.com/sfp-to-10gbase-t-adapter-module-buyers-guide/ https://www.servethehome.com/sfp-to-10gbase-t-adapter-module...