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The Case Against A Proposed Relaxation Of Out-Of-Band Noise And Spurious Specifications For Docsis Edge-Qam Rf Devices, Ron D. Katznelson
The Case Against A Proposed Relaxation Of Out-Of-Band Noise And Spurious Specifications For Docsis Edge-Qam Rf Devices, Ron D. Katznelson
Ron D. Katznelson
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.