IEEE Std 802.3bp “Standard for Ethernet Amendment 4: Physical Layer Specifications and Management Parameters for 1 Gb/s Operation over a Single Twisted Pair Copper Cable” was developed by the IEEE P802.3bp 1000BASE-T1 PHY Task Force and approved by the IEEE-SA Standards Board on June 30, 2016. This amendment defines the Physical Layer (PHY) specifications and management parameters for point-to-point full duplex 1 Gb/s Ethernet operation over single balanced twisted-pair cabling. This PHY will support automotive, industrial controls and automation, transportation (aircraft, railway and heavy trucks), and other, such as carbon footprint sensitive, applications that benefit by a reduction in the number of wire pairs and magnetics. This amendment adds one new Physical Layer (PHY) specification for 1 Gb/s transmission over one balanced copper twisted-pair and supports optional Energy Efficient Ethernet (EEE) operation for the PHY.

The two recognized link segments for a 1000BASE-T1 PHY system consist of up to 15 m of ruggedized single balanced twisted-pair cabling, with up to four in-line connectors (“link segment type A”) and up to 40 m of ruggedized single balanced twisted-pair cabling, with up to four in-line connectors (optional “link segment type B”) . The mechanical interface to the balanced cabling is a 2-pin connector or two pins of a multi-pin connector, which is not specified by the amendment. All cabling and mechanical interfaces are required to perform in environmentally stressful conditions as defined by referenced ISO General Load, Electrical Load, Mechanical Load, Climatic Load, and Chemical Load specifications.

Goals and Objectives for 1000BASE-T1 operation:

  • Preserve the IEEE 802.3/Ethernet frame format at the MAC client service interface
  • Preserve minimum and maximum frame size of the current IEEE 802.3 standard
  • Support full duplex operation only
  • Support a speed of 1 Gb/s at the MAC/PLS service interface
  • Maintain a bit error ratio (BER) of less than or equal to 10-10 at the MAC/PLS service interface
  • Support 1 Gb/s operation in automotive & industrial environments (e.g. EMC, temperature)
  • Define optional Energy-Efficient Ethernet
  • Define the performance characteristics of an automotive link segment  and a PHY to support point-to-point operation over this link segment with a single twisted pair supporting up to four inline connectors using balanced copper cabling for at least 15 m for the automotive link segment
  • Define the performance characteristics of optional link segment(s) for the above PHY for industrial controls and/or automation, transportation (aircraft, railway, bus and heavy trucks) applications with a goal of at least 40 m reach
  • Define optional startup procedure which enables the time from power_on=FALSE to valid data to be less than 100ms
  • Support optional single-pair auto-negotiation mechanism

The IEEE 802.3 Reduced Twisted Pair Gigabit Ethernet PHY Call-For-Interest Consensus Presentation can be found here:

The Project Authorization Request (PAR), approved on December 5, 2012, with changes from March 20, 2014 and June 12, 2014, can be found here:

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