4 ms·
Related: ethernet over barbed wire: http://www.sigcon.com/Pubs/edn/SoGoodBarbedWire.htm http://www.sigcon.com/Pubs/edn/SoGoodBarbedWire.htm
by Faaak 5y ago
Related: ethernet over barbed wire: http://www.sigcon.com/Pubs/edn/SoGoodBarbedWire.htm http://www.sigcon.com/Pubs/edn/SoGoodBarbedWire.htm
- throw0101a 5y agoThere are IEEE standards for single-pair Ethernet: > In addition to the more computer-oriented two and four-pair variants, the 10BASE-T1,[17] 100BASE-T1[18] and 1000BASE-T1[19] single-pair Ethernet physical layers are intended for industrial and automotive applications[20] or as optional data channels in other interconnect applications.[21] 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.[22] As of 2021, the P802.3cy Task Force is examining having 25, 50, 100 Gb/s speeds at lengths up to 11 m.[23] * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Single-pair https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Sin... Including power delivery: > The IEEE 802.3bu-2016[12] amendment introduced single-pair Power over Data Lines (PoDL) for the single-pair Ethernet standards 100BASE-T1 and 1000BASE-T1 intended for automotive and industrial applications.[13] On the two-pair or four-pair standards, power is transmitted only between pairs, so that within each pair there is no voltage present other than that representing the transmitted data. With single-pair Ethernet, power is transmitted in parallel to the data. PoDL initially defined ten power classes, ranging from 0.5 to 50 W (at PD). > Subsequently, PoDL was added to the single-pair variants 10BASE-T1,[14] 2.5GBASE-T1, 5GBASE-T1, and 10GBASE-T1[15] and as of 2021 includes a total of 15 power classes with additional intermediate voltage and power levels.[14] * https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL
- toast0 5y agoSadly, there's not much in the way of equipment for this. I could really use two small 10BaseT-1 to 10BaseT converters, preferably both powered from one end.
- throw0101a 5y agoSeems to be mostly in the automative and industrial space, with some embedded stuff. I could also see it being useful for door security (badge readers, latch control).
- toast0 5y agoFor me, I've got a gate with a keypad. It's got an ethernet port, but they only ran 3 pair to it, and it works best with 2 pair for voice communications, so I've only got one pair for data, not enough to use.
- cpgxiii 5y agoSince most of the 1000Base-T1 gear is still unreasonably expensive/effectively impossible to get quickly in small quantities, you can run 100mbps and 1gbps Ethernet over "reasonable" lengths of single twisted pair using MoCA adapters plus coax->twisted pair baluns. Achievable cable length will obviously depend on EMI conditions, but I've had reasonable success with this method on twisted pairs in industrial robots.
- neilalexander 5y agoGIGA G4201TM modems are built for exactly this, using the G.hn standard, over a single pair. I’ve been using these to avoid digging into walls to replace wiring — they claim to sync at up to 1700mbps and, even in the real world, I’m saturating the 1000BASE-T ports.