Research from ASSIA suggests that terabit throughput is possible over twisted-pair DSL lines. Dr. John Cioffi, chairman and CEO of ASSIA and emeritus professor at Stanford, says extreme high frequency sub-millimeter waves can increase single-line data rates to terabits per second at 100 meters on ordinary twisted-pair phone wire, as well as speeds of 100 Gbps over 300 meters and 10 Gbps at 500 meters.
Cioffi said: "Fiber-like speeds of 10 to thousands of gigabits per second are possible by using the previously unexploited waveguide modes of current copper infrastructure. Waveguide-mode use is similar to use of millimeter-wave transmissions in advanced wireless and 5G. Waveguides can enable use of frequencies above 100 GHz for extraordinary speeds."
ASSIA develops management and optimization software for broadband and WiFi networks.
Cioffi's keynote at the Paris G.fast Summit conference on May 10 titled "TerabitDSL" will introduce the new method. During the keynote, Cioffi will explain how 5G wireless often runs at 28 GHz and 39 GHz, while commercial microwave gear can run at 70 GHz and 90 GHz. Wireless above 300 GHz (sub-millimeter wave) is being actively researched. Early designs suggest that link latency of 50-100 μs is readily achievable, which would allow latency specifications of 1 ms or less to be achieved with terabit DSL lines.
G.fast uses only 200 MHz, while wireless uses 25 times as much spectrum.
"The challenge was to develop practical ways to use higher frequencies over wires. Working with my ASSIA colleagues Dr. Chan Soo Hwang, Dr. Ken Kerpez, and Dr. Ioannis Kanellakopoulos, we found a solution. I don't expect anyone to need terabits per second to their home anytime soon. Terabits per ssecond will be most valuable to the data centers controlled by phone companies as well as to Internet companies such as Google and Microsoft. While Tbps demand may be a few years into the future, 10-100 Gbps speeds are important to networks today and will be a big market. Rapid advances in the Internet of Things (IoT), including autonomous vehicles, means the number of connected devices requiring high-speed ubiquitous connectivity will increase dramatically in the next decade. We believe that terabit DSL will play a critical role in serving the needs of that ecosystem with ultra-high-throughput and ultra-low-latency connectivity."
The presentation is available at http://www.assia-inc.com/terabit-dsl/.