Collision-Free Hyper-Speeds on the Bi-Directional FDX Highway (2022)

By Dr. Robert Howald, Comcast; John Ulm, CommScope; Saif Rahman, Comcast; Dr. Zoran Maricevic, CommScope

The promise of 10G is emerging, as Full Duplex DOCSIS (FDX) and Extended Spectrum DOCSIS (ESD) solutions make their way through laboratory testing to field trials towards first market launches. DOCSIS 4.0 consists of these two complementary technologies aimed at dramatically increasing upstream capacity and, correspondingly, upload speeds that customers will enjoy.

The FDX option for DOCSIS 4.0 is based on use of spectrum in the 108 MHz-684 MHz band (or subset of the band) for both downstream and upstream. Intuitively, signals overlapping in frequency and time interfere with one another. However, FDX has two key innovations that prevent this. Echo Cancellation (EC) technology removes potential interference where possible. Interference that cannot be removed by EC is avoided by controlling transmission timing within the DOCSIS scheduler. FDX sizes up the network and creates groups of users – “Interference Groups”(IG) – that should not access the same chunk of spectrum at the same time. This knowledge is incorporated into algorithms for allocating downstream and upstream resources.

By clicking the "Download Paper" button, you are agreeing to our terms and conditions.

Similar Papers

Broadband Capacity Growth Models - Will the end of Exponential Growth eliminate the need for DOCSIS 4.0?
By John Ulm, Zoran Maricevic, Ph.D., Ram Ranganathan; CommScope
What is 10G – The Technology Foundation
By Dr. Robert Howald, Dr. Sebnem Ozer, Robert Thompson, Saif Rahman, Dr. Richard Prodan & Jorge Salinger, Comcast
Network Migration to 1.8 GHz - Operational “Spectral Analysis” Measured in nano-Hertz, a 30-Year Perspective
By Zoran Maricevic, John Ulm, Craig Coogan; CommScope
Roaring into the ‘20s with 10G
By Dr. Robert Howald, Robert Thompson, Sebnem Ozer, Daniel Rice & Larry Wolcott, Comcast; Dr. Tom Cloonan, Dr. Ruth Cloonan & John Ulm, CommScope; Jan Ariesen, Technetix
Developing the DOCSIS 4.0 Playbook for the Season of 10G
By Dr. Robert Howald, Jon Cave & Olakunle Ekundare, Comcast; John Williams & Matt Petersen, Charter Communications
Cable 10G vs. Wireless 5G: Foe Or Friend?
By John Ulm & Zoran Maricevic, CommScope
Comcast Underground: Innovative Fiber Deployments Over Existing Underground Critical Infrastructure
By Venk Mutalik, Pat Wike, Doug Combs, Alan Gardiner, Dan Rice; Comcast
Is Unity Gain Still the #1 Objective?
By John Ulm, Dr. Zoran Maricevic & Dr. Frank O’Keeffe, CommScope
Overlaying Mid-Band Spectrum Backhaul/Fronthaul onto HFC
By John Ulm, Dr. Martin Zimmerman, PhD, Stuart Eastman & Zoran Maricevic, PhD, CommScope
Managing the Coronavirus Bandwidth Surge: How to Cope with the Spikes and Long-term Growth
By John Ulm & Dr. Thomas Cloonan, CommScope
More Results >>