The Case Against A Proposed Relaxation Of Out-Of-Band Noise And Spurious Specifications For DOCSIS Edge-QAM RF Devices

Ron D. Katznelson, Broadband Innovations, Inc.

Abstract

This submission supported Broadband Innovations' (BI) opposition to relaxing the Out-of-Band Noise and Spurious specifications in QAM downstream transmission of Edge-QAM (“EQAM”) devices. The specifications relaxation was proposed by a consortium of equipment vendors who called it the Joint Proposal for Self-Aggregate noise and spurious (“JPSA”). This note explains why the adoption of the JPSA would strip CATV systems from having sufficient operational noise and interference margins.

Post submission note: Despite the overwhelming majority of the Working Group's acceptance and recommendation of the JPSA, CableLabs' Technical Board voted to accept BI's proposal and to reject the JPSA.