The next milestone in the build-out of the broadband access network is called Fiber-To-The-Distribution Point (FTTdp).
This concept calls for running optical fiber to a distribution point that can be flexibly installed relatively close to the customer premise. The existing copper infrastructure is utilized to complete the access line to and within the building. To determine how 1-2 Gbit/s data rates can actually be achieved in such environments, researchers from Fraunhofer ESK will be working with Lantiq and InnoRoute GmbH until 2016 as part of the FlexDP research project.
Achieving high access data rates requires utilization of the higher frequency ranges on the phone lines. This is possible only if the copper line segment of the data transmission channel is relatively short. With this in mind, Fraunhofer ESK is analyzing the channel properties within these high frequency ranges as part of the FlexDP project. Lantiq and InnoRoute will use the results of this work to eventually develop a reverse powered, flexible distribution point installed closer to the customer premise. Through a combination of research, implementation and testing, the partners are laying the groundwork for the practical application of FTTdp.
Measuring channel properties in the 300 MHz frequency range
VDSL2 utilizes frequencies up to 30 MHz. With the aim of achieving still higher data rates, Fraunhofer ESK is examining the use of frequencies up to 300 MHz. Apart from the transmission characteristics of the line, background noise and sporadic impulse interference are important factors that impact transmission speeds.
Higher frequency ranges permit the deployment of new transmission schemes such as G.fast, which operates up to 212 MHz and is currently in the standardization stage. By extending the currently used spectrum, data rates of up to 2 Gbit/s are theoretically possible, but only if the channel characteristics are consistently taken into consideration.
In order to gain a realistic picture of the situation in Germany, Fraunhofer ESK researchers identified and measured the various types of cables used in the country and examined typical customer premise wiring installations.
Based on this preparatory work and with new measurements in the 300 MHz extended frequency range, engineers will develop a simulation environment allowing them to recreate and test a variety of network scenario. Researchers will then be able to pinpoint early on any issues that affect high bit rate data transmission, thus paving the way for the development of reliable solutions. The know-how gleaned from this work will furthermore flow into future transmission system designs and installations.
Energy-efficient, flexible distribution points accelerate network build-out
Higher data rates with a hybrid network can be reached on short lines. With G.fast, this equates to a maximum of around 250 meters. It also requires locations closer to the customer premise, a task made easier if the distribution points are not dependent on existing power lines and instead are reverse power fed by the customer's telephone lines. That means the shoebox-sized distribution points must be extremely energy-efficient.
The major challenge of this remote power concept lies in the fluctuating loads placed on the network since each customer's behavior is usually different with respect to bandwidth usage and time of day. The hardware architectures and components that will be developed by Lantiq and InnoRoute must be as energy-efficient as possible, just like the transmission method itself, in order to deal with varying customer usage patterns.
That means a single customer modem must provide enough power to operate the distribution point. Transmitter and receiver components also need the capability to dynamically turn on and off, which in turn results in dynamic changes to the crosstalk interference environment. This creates another challenge in developing algorithms for stable transmission in dynamically-changing scenarios. Fraunhofer ESK is furthermore working on emergency operation concepts to compensate for power outages.
This project is being funded by the Bavarian Research Foundation.
For further details contact:
Marion Rathmann | Fraunhofer Institute for Embedded Systems and Communication Technologies ESK | PR & Marketing | phone +49 89 547088-395
Hansastraße 32 | 80686 München | www.esk.fraunhofer.de | firstname.lastname@example.org |
Kommunikation | Fraunhofer-Institut
New Foldable Drone Flies through Narrow Holes in Rescue Missions
12.12.2018 | Universität Zürich
NIST's antenna evaluation method could help boost 5G network capacity and cut costs
11.12.2018 | National Institute of Standards and Technology (NIST)
The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.
Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
14.12.2018 | Power and Electrical Engineering
14.12.2018 | Physics and Astronomy
14.12.2018 | Physics and Astronomy