Ingress Margin Improvement In Sub-Low Return HFC Plant (1996)

By Paul D. Brooks, Time Warner Cable

Many engineers regard the task of overcoming ingress as the most difficult in reliable operation of return plant. Because ingress levels are dependent only on source characteristics and physical coupling "receiving antenna" mechanisms, every dB of operating level is one additional dB of ingress immunity. Since the physical coupling mechanisms have historically been difficult to control, it is essential to operate signal sources at the highest possible levels in order to "buy margin" over ingress sources. This paper will introduce three techniques of ingress margin improvement:

  1. Leveling of tap port sensitivity through purposeful introduction of loss in the sub-low band.

  2. Leveling of tap port sensitivity by a new approach to selection of return amplifier input levels.

  3. A brief examination of the upper limits of existing terminal device output levels and power densities, and the implication of these limits on the selection of the operating points of return amplifiers as these operating points pertain to ingress margin.

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

Similar Papers

Ingress Margin Improvement In Sub-Low Return HFC Plant
By Paul D. Brooks, Time Warner Cable
1996
A Migration Strategy to High Capacity Return on HFC Networks
By Jim Chiddix and Donald Gall, Time Warner Cable Gerry Shimirak, Raychem
1996
Incremental Deployment of Network Powering Infrastructure
By Paul D. Brooks, Time Warner Cable
1996
Utilizing Ingress as a Plant Maintenance Strategy
By Raymond J. Schneider
1998
Time Selective Swept Return Loss A New Look At Coaxial Cable
By John L. Huff, Staff Engineer, Times Mirror Cable Television
1988
Lessons For The Interactive Return System
By Dr. Kerry D. LaViolette, Philips Broadband Networks, Incorporated
1996
HFC Improvement For DOCSIS 3.1 Evolution
By Maxwell Huang, Cisco Systems
2015
Two-Way Plant Characterization
By Albert J. Kim, Rogers Engineering
1995
The Evolution Of Audio/Video System Facilities At Warner Amex Metropolitan Cable Television Systems
By Neil Neubert, Warner Amex Cable Communications Inc.
1984
Guide To Plant Analysis Increasing Channel Capacity Of A C.A.T.V. System
By Paul D. Brooks, General Electric Cablevision Corporation
1984
More Results >>