News


Ethernet over copper for broadband - new standard

27 February 2002 News

The IEEE-802.3ah subcommittee is developing a standard for Ethernet over voice-grade copper. Dubbed as the Ethernet in the First Mile, the subcommittee has made great advances toward its goal of securing a standard for 10 Mbps services over at least 762 m of copper wire. The group expects to publish a final standard in 2004.

Long-reach Ethernet (LRE) extends Ethernet by utilising unconditioned, twisted-pair copper telephone wiring. LRE uses frequency-division duplexing to separate the downstream channel, the upstream channel and plain old telephone service (POTS), ISDN or PBX signalling services. This enables the overlay of LRE on existing POTS, ISDN or PBX signalling services without disruption. LRE and POTS/ISDN/PBX services may then be transmitted over the same line without interfering with each other. LRE provides full-duplex transmission at remarkable speeds and long distances:

* 15 Mbps symmetric rate (up to 975 m).

* 10 Mbps symmetric rate (up to 1219 m).

* 5 Mbps symmetric rate (up to 1524 m).

Because of these advances in speed and distance, a host of new value-added broadband services can be offered, including:

* Broadband Internet connectivity for business travellers, office workers and home users.

* Secure, high-speed network access through the addition of VPNs.

* IP telephony which allows remote users interact and collaborate in realtime.

* Converged video/voice/data applications, such as video-on-demand, videoconferencing and e-learning.

* For most implementations, three devices are required to effectively deliver LRE to users - an LRE switch, LRE customer premises equipment (CPE) and a POTS splitter.

LRE switches condition incoming and outgoing Ethernet packets so they can run over standard copper wiring. Otherwise, they act much as traditional Ethernet switches - directing, storing and forwarding packets, as well as matching destination and source addresses together into virtual channels. LRE switching units simply need to be installed in a building basement, along with the telephone equipment, using 10/100 Mpbs or 1000Base-T to uplink to the Internet router and/or local servers. 10/100 switch ports also can be used to daisy-chain multiple LRE switches.

Each LRE port is terminated in the room with a CPE device. The device splits LRE and POTS traffic, converting the LRE traffic into Ethernet traffic and vice versa. This provides Ethernet access to the LRE signals that are on the telephone wire, without interfering with the service already in place.

A POTS splitter lets LRE and POTS co-exist on the same telephone line. It is necessary for deployments in which the PBX system is on-site and POTS traffic must coexist over the same copper wiring as LRE traffic.

Together, these equipment provide a robust broadband solution that is:

* Low-cost - Building owners do not need to rewire their buildings to achieve remarkable increases in available bandwidth.

* High-speed - LRE delivers bandwidth of up to 15 Mbps.

* Extremely functional - LRE supports a range of broadband capabilities.

* LRE changes the economics of broadband provisioning by providing a cost-effective solution that preserves the existing communications infrastructure of multiunit buildings and enterprise campus customers.

For further information on TDK Semiconductor products, contact Electrocomp 011 458 9000 or see the new website: www.tdksemiconductor.com



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

New series of power ribbon wire-wound resistors
Electrocomp Power Electronics / Power Management
This QL/QRZG series of high-power resistors have a high-power load up to 2500 W and are suitable for applications such as industrial braking, EV battery packs and charging stations.

Read more...
Yamaha displays affordable automation at Automatica 2022
Truth Electronic Manufacturing News
Yamaha Motor Robotics FA Section has shown how affordable robots can transform processes in diverse industries, presenting live demonstrations to visitors at Automatica 2022.

Read more...
Vicor launches new automotive e-book on electrification
Future Electronics News
The downloadable e-book from Vicor shares insights into new power conversion trends and technologies to support vehicle electrification.

Read more...
Audi South Africa offers free connectivity upgrades
News
The announcement covers select models from 2008 onwards that do not have Audi ‘connect’ installed and will use the new connect ‘plug-and-play’ technology.

Read more...
High-power semiconductor solutions for green hydrogen electrolyser applications
EBV Electrolink News
Gain insights into AC- and DC-coupled electrolyser applications and learn about Infineon’s best-in-class semiconductor solutions in the upcoming webinar.

Read more...
Actum Group leads in the interconnect industry
Actum Electronics News
Actum Group is a specialist importer and distributor of industrial and electronic products in Southern Africa and a leader in the interconnect industry.

Read more...
Arrow Electronics opens new primary distribution centre
Altron Arrow News
Arrow Electronics, represented in South Africa by Altron Arrow, announced that it has opened a new, state-of-the-art primary distribution centre in Venlo, the Netherlands.

Read more...
Quectel masterclass: iSIM implementation
iCorp Technologies News
Online Teaser: The latest masterclass webinar offered by Quectel covers the technology and capability of the iSIM and its use in the development of scalable high-volume IoT applications.

Read more...
From the editor's desk: 42
Technews Publishing News
To most people, 42 is simply a number. To some, they may think about the fact that it is an even number, or maybe the product of six and seven, or that this is the length of a standard marathon in kilometres. ...

Read more...
Surface-mount resettable fuses
Electrocomp Passive Components
The new series of fuses, suitable for overcurrent and thermal protection, expand the hold current up to 6 A and the maximum voltage to 33 V DC.

Read more...