7 ms·
Yeah, the mikrotiks recommend populating only every other slot if you're using RJ45 transceivers to avoid overheating.
by ericd 5y ago
Yeah, the mikrotiks recommend populating only every other slot if you're using RJ45 transceivers to avoid overheating.
- aix1 5y agoIs 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...