World Library  
Flag as Inappropriate
Email this Article

Ethernet over coax

Article Id: WHEBN0017518144
Reproduction Date:

Title: Ethernet over coax  
Author: World Heritage Encyclopedia
Language: English
Subject: Internet in Romania, Packet segmentation, Networking cables, Automatic repeat request, Carrier sense multiple access with collision avoidance
Collection: Ethernet
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Ethernet over coax

Ethernet over Coax (EoC) is a family of technologies that supports the transmission of Ethernet frames over coaxial cable.

Contents

  • History 1
  • Standards 2
    • IEEE 1901 (HomePlug) 2.1
    • ITU-T G.hn 2.2
    • SLOC 2.3
    • Other standards 2.4
  • CATV compatibility 3
  • References 4
  • See also 5

History

The first Ethernet standard, known as 10BASE5 (ThickNet) in the family of IEEE 802.3, specified baseband operation over 50 ohm coaxial cable, which remained the principal medium into the 1980s, when 10BASE2 (ThinNet) coax replaced it in deployments in the 1980s; both being replaced in the 1990s when thinner, cheaper twisted pair cabling came to dominate the market. The use of coaxial cable for Ethernet is still supported by the standard, but rarely used because coaxial cable is more costly to purchase, install, and operate for local area networks.

Research in Ethernet transmission over coaxial cable continued, as both consumers and telecommunications operators strive to use existing 75 ohm coaxial cable installations (from cable television or CATV), to carry broadband data into and through the home, and into multiple dwelling unit (MDU) installations.

Most EoC technologies are being developed for in home or in premise networking and are expected to be operated within the domain of a single operator.

Standards

Home networking standards
Common name IEEE standard
HomePlug
HD-PLC
1901
Wi-Fi 802.11a
802.11b
802.11g
802.11n
802.11ac
Common name ITU-T recommendation
HomePNA 2.0 G.9951–3
HomePNA 3.1/HomeGrid G.9954
G.hn/HomeGrid G.9960 (PHY)
G.hn/HomeGrid G.9961 (DLL/MAC)
G.hn/HomeGrid G.9962 (Management Plane)
G.hn-mimo G.9963
G.hn/HomeGrid G.9964 (PSD Management)
G.hnta G.9970
G.cx G.9972

The Institute of Electrical and Electronics Engineers (IEEE) maintains all official Ethernet standards in the 802.x family or protocols.

Active work in Ethernet over Coax is ongoing in IEEE 1394 Trade Association (TA) developed based on the S400 standard.

IEEE 1901 (HomePlug)

HomePlug AV/HomePlug AV2 standards utilize low frequencies, strictly under FM radio (87.5 MHz). Development of this technology uses advanced modulations, 4096 QAM and higher and wider band.[1] Qualcomm/Atheros and Spidcom are now (04/2014) two major HomePlug chip producers.

ITU-T G.hn

The ITU-T G.hn standard provides high-speed (up to 1 Gigabit/s) local area networking over existing home wires, including coaxial cable, power lines and phone lines. It defines an Application Protocol Convergence (APC) layer for encapsulation standard 802.3 Ethernet frames into G.hn MAC Service Data Units (MSDUs).

Other ITU-T standards for home networking over coaxial cable include G.9954, also known as HomePNA 3.1[2]

SLOC

The Intersil SLOC (security link over coax) standard simultaneously transmits (one-way) analog CVBS video and 2-way Ethernet over a single coax cable.[3][4][5]

Other standards

There are also proprietary EoC implementations using WiFi-like OFDM transmission.

CATV compatibility

EoC research is focused on the use of existing cable television (CATV) infrastructure for Internet access or broadband data transmission for the purpose of being compatible with the existing CATV (or sometimes satellite television) broadcast signals simultaneously transmitted on the same cable. The EoC technologies must operate outside the frequency domain currently used for CATV or for satellite receiver to set-top box transmissions. Most EoC technologies are designed to operate in frequency bands above 1 GHz, which is the upper bound of television signals and for systems designed to operate in North America using the SCTE 55-1 and SCTE 55-2 CATV transmission systems, as well as in most of Europe and portions of Asia. In many localities CATV systems operate only up to 550 MHz or 750 MHz, wherein some EoC technologies focus on using spectrum between 550 MHz or 750 MHz and 1 GHz. Though less costly, they could potentially conflict with future spectrum expansion up to 1 GHz. Some markets focus on using this 750 MHz to 1 GHz spectrum for EoC, specifically avoiding EoC bands above 1 GHz due to potential ingress noise from over-the-air transmissions and cellular systems.

References

  1. ^ EOC forum
  2. ^ https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.9954-200701-I!!PDF-E&type=items
  3. ^ "Security Link Over Coax Bridges the IP Surveillance Gap".
  4. ^ "ComNet introduces IP + analog video over coax; Introduces SLOC Analog And IP Video Over COAX Distance Extender".
  5. ^ "SLOC Ecosystem For Video Surveillance Over Coax Grows".

See also

  • DOCSIS - Data Over Cable Service Interface Specification
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.