Ethernet in the first mile

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Ethernet in the First Mile (EFM) is a protocol that is defined in the Ethernet standard IEEE 802.3ah.

history

A first step was the EtherLoop technology, which was invented in 1996 by Nortel Networks and in 1998 by the company Elastic Networks.

The technology was primarily invented by Jack Terry. The hope was to combine the packet-based character of Ethernet with the ability of Digital Subscriber Line (DSL) technology, and to work with existing telephone connection wires. The name comes from the subscriber line, which traditionally describes the lines from a telephone company office to a subscriber. The protocol was half duplex with control from the provider side of the loop. It adapted to line conditions, with a peak of 10 Mbit / s, but 4-6 Mbit / s was more typical at a distance of about 3700 m. The symbol rates were 1 mega baud or 1.67 Megabaud, 2, 4 or 6 bits per symbol.

The EtherLoop product name is registered as a trademark in the United States and Canada. The EtherLoop technology was eventually bought by Paradyne Networks in 2002, which in turn was bought by Zhone Technologies in 2005.

Another concept was to use Ethernet variants that the fiber optic network should use for both private and business customers. This was an example of what has come to be known as fiber optic to the home (FTTH). Fiberhood Networks provided this service from 1999 to 2001.

Some early products, which Infineon marketed as 10BaseS around the year 2000 , were technically not baseband signaling, but rather passband as used in the very high bit rate digital subscriber line technology ( VDSL ). In 1997 a patent was filed by Peleg Shimon, Porat Boaz, Noam Alroy, Rubinstain Avinoam and Sfadya Yackow. Long Reach Ethernet was the product name used by Cisco Systems from 2001. It supported modes of 5 Mbit / s, 10 Mbit / s and 15 Mbit / s depending on the distance.

In October 2000, Howard Frazier submitted a Call for Interest to the IEEE , at a meeting in November 2000 the IEEE 802.3 working group established the study group "Ethernet in the First Mile" and on July 16, 2001 the working group 802.3ah. At the same time, the participating providers formed the Ethernet in the First Mile Alliance (EFMA) in December 2001 to promote Ethernet subscriber access technology and support the IEEE standards. At this meeting, EtherLoop technology was renamed to 100BASE-CU and another technology called EoVDSL was defined for Ethernet over VDSL.

The working group's EFM standard was adopted on June 24, 2004 and published as IEEE 802.3ah-2004 on September 7, 2004. In 2005 it was included in the IEEE 802.3 basic standard. In 2005, EFMA was taken over by the Metro Ethernet Forum.

In early 2006, work began on an even faster 10 Gigabit / second Ethernet passive optical network (10G-EPON) standard, which was adopted in 2009 as IEEE 802.3av. Work on EPON was continued by the IEEE P802.3bk Extended EPON Task Force formed in March 2012. One of the main goals of this task force was to support the power budget classes PX30, PX40, PRX40 and PR40 for both 1G-EPON and 10G-EPON. The 802.3bk change was approved by the IEEE-SA SB in August 2013 and published shortly afterwards as the IEEE Std 802.3bk-2013 standard.

In November 2011, IEEE 802.3 began work on the EPON Protocol over Coax (EPoC).

description

EFM defines how Ethernet can be transmitted over new media types using a new Ethernet Physical Layer (PHY) interface:

copper

The following two standards defined a symmetrical , full-duplex point-to-point connection.

  • 2BaseTL: based on SHDSL , with a maximum data rate of 5.69 Mbit / s and a maximum cable length of 2700 m.
  • 10PassTS: based on VDSL , with a data rate of at least 10 Mbit / s and a maximum range of 750 m.

glass fiber

  • 100BaseLX10: defines a point-to-point connection with a transmission speed of 100 Mbit / s over a single mode fiber pair with a range of 10 km
  • 100BaseBX10: defines a point-to-point connection with a transmission speed of 100 Mbit / s over a single single mode fiber with a range of 10 km.
  • 1000BaseLX10: defines a point-to-point connection with a transmission speed of 1000 Mbit / s over a single single mode fiber with a range of 10 km.
  • 1000BaseBX10: defines a point-to-point connection with a transmission speed of 1000 Mbit / s over a single mode fiber pair with a range of 10 km.

Passive optical network

  • 1000BasePX10: defines a point-to-multipoint connection with a transmission speed of 1000 Mbit / s based on PONs and a range of 10 km.
  • 1000BasePX20: defines a point-to-multipoint connection with a transmission speed of 1000 Mbit / s based on PONs and a range of 20 km.

2BASE-TL and 10PASS-TS

Unlike 10BASE-T, 100BASE-T and 1000BASE-T PhYs, which provide a single rate of 10, 100 or 1000 Mbps, 10PASS-TS and 2BASE-TL can connect rate depending on the characteristics of the copper medium (such as length, wire diameter or thickness, number of pairs when the connection is aggregated, amount of crosstalk between the pairs, etc.), the desired connection parameters (such as desired SNR margin, power back-off etc.) and the regional spectral restrictions vary.

Via the 2BASE-TL interface, G.SHDSL can transfer at least 2 Mbit / s over distances of up to 2.7 kilometers

In contrast to this, the 10Pass TS interface with VDSL or VDSL2 is particularly suitable for short distances, up to approx. 750 meters, but higher data rates, at least 10 Mbit / s, are to be expected here. Both are full duplex points -to-point connection in.

Web links

Individual evidence

  1. ↑ a b Robust Ethernet in the First Mile. (PDF) Retrieved May 22, 2019 (English).
  2. ↑ Networking & Telecom: Compaq enveils enterprise backbone wares. Retrieved May 22, 2019 .
  3. ↑ Nortel combines best of DSL with best of Ethernet for 10Mbps Internet access. Retrieved May 22, 2019 .
  4. ↑ Trademark Search: EtherLoop. Retrieved May 22, 2019 .
  5. ↑ Paradyne Gets Elastic. Retrieved May 22, 2019 .
  6. ↑ Elastic Networks: Elite Modem ( Memento from December 22, 2010 in the Internet Archive )
  7. ↑ Fiberhood Networks ( Memento from September 22, 2001 in the Internet Archive )
  8. ↑ Ethernet in the First Mile. (PDF) Retrieved May 22, 2019 (English).
  9. ^ Infineon's QAM-VDSL Gains Wide Support in Japan; Ando Selects Infineon's Standards Compliant Packet over VDSL Chipset for Video DSLAM Systems ( Memento from April 13, 2014 in the Internet Archive )
  10. ↑ Infineon Strengthens Leadership in MDU / MTU Market with Ethernet over VDSL Technology Patent Award ( Memento from April 13, 2001 in the Internet Archive )
  11. ^ Infineon Announces Second Quarter Results. April 24, 2011, accessed May 22, 2019 .
  12. ↑ Cisco Long-ReachEthernet ( Memento from March 22, 2005 in the Internet Archive )
  13. ↑ Cisco Offers New Long-Reach Ethernet ( Memento from March 7, 2016 in the Internet Archive )
  14. ^ "Ethernet in the Last Mile" Call for Interest. Retrieved May 22, 2019 .
  15. ^ EFM Copper Objective. (PDF) July 2001, accessed on May 22, 2019 (English).
  16. ↑ MEF Absorbs EFMA. August 3, 2005, accessed May 22, 2019 .
  17. ↑ 10Gb / s Ethernet Passive Optical Network IEEE P802.3av Task Force. October 14, 2009, accessed May 22, 2019 .
  18. ↑ IEEE P802.3bk Extended EPON Task Force. December 18, 2012, accessed May 22, 2019 .
  19. ↑ Physical Layer Specifications and Management Parameters for Extended Ethernet Passive Optical Networks. Retrieved May 22, 2019 .
  20. ↑ IT administrator: Ethernet in the First Mile. Retrieved May 22, 2019 .
  21. ↑ IT administrator: 2BaseTL. Retrieved May 22, 2019 .
  22. ↑ IT administrator: 10PassTS. Retrieved May 22, 2019 .
  23. ↑ IT administrator: 100BaseLX10. Retrieved May 22, 2019 .
  24. ↑ IT administrator: 100BaseBX10. Retrieved May 22, 2019 .
  25. ↑ IT administrator: 1000BaseLX10. Retrieved May 22, 2019 .
  26. ↑ IT administrator: 1000BaseBX10. Retrieved May 22, 2019 .
  27. ↑ IT administrator: 1000BasePX10. Retrieved May 22, 2019 .
  28. ↑ IT administrator: 1000BasePX20. Retrieved May 22, 2019 .
  29. ↑ IT knowledge: 2Base-TL. March 29, 2015, accessed May 22, 2019 .
  30. ↑ IT knowledge: 10Pass-TS. Retrieved May 22, 2019 .