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METHOD TO REDUCE CONDITIONAL ACCESS SYSTEM ENCRYPTION COMPLEXITY AND COST

IP.com Disclosure Number: IPCOM000245769D
Publication Date: 2016-Apr-06
Document File: 7 page(s) / 61K

Publishing Venue

The IP.com Prior Art Database

Related People

Jim Elsenbeck: AUTHOR [+3]

Abstract

In a cable video distribution system, a high density edge Quadrature Amplitude Modulation (QAM) chassis incorporating video encryption adds the encryption capability during the output of the multiplexing process. This requires the actual encryption process to reside on multiple processing cards within the chassis, with interfaces to conditional access (CA) equipment for entitlement control message (ECM) generation. A mechanism is presented herein to aggregate CA requests for a service that is processed on multiple processing cards, and to then distribute and synchronize the response back to all the processing cards. This reduces cost and complexity of the system.

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METHOD TO REDUCE CONDITIONAL ACCESS SYSTEM ENCRYPTION COMPLEXITY AND COST

AUTHORS:

Jim Elsenbeck Robin Lamote

Ken Nicholas

CISCO SYSTEMS, INC.

ABSTRACT

    In a cable video distribution system, a high density edge Quadrature Amplitude Modulation (QAM) chassis incorporating video encryption adds the encryption capability during the output of the multiplexing process. This requires the actual encryption process to reside on multiple processing cards within the chassis, with interfaces to conditional access (CA) equipment for entitlement control message (ECM) generation. A mechanism is presented herein to aggregate CA requests for a service that is processed on multiple processing cards, and to then distribute and synchronize the response back to all the processing cards. This reduces cost and complexity of the system.

DETAILED DESCRIPTION

    Some video services, such as Broadcast services, are typically encrypted once and distributed throughout the system. As these types of video services are added to newer platforms, the architectures require each processing card to have a separate encryption process, substantially increasing the demand on the external CA equipment.

    For example, in a system with 100,000 subscribers, a service in today's approach would require one ECM per cryptoperiod. If this system was designed with fiber nodes each serving 200 subscribers this would require 500 separate outputs, increasing the ECM delivery demand by a factor of 500 per service since each output would require a separate encryption. The CableLabs Converged Cable Access Platform (CCAP) provides replication where identical content within a chassis can be replicated which will reduce the total loading. Using a chassis with 8 processing cards, and 8 output ports per processing card, if all 8 output ports were utilized on a processing card this could reduce

Copyright 2016 Cisco Systems, Inc.
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the external CA loading from 500 down to 63 (500 outputs/8 outputs per processing card). The mechanism to allow this reduction is what is covered by the solution presented herein.

    Figure 1 below illustrates an edge QAM chassis and depicting how one MPEG Transport Stream would be encrypted and then externally (RF) split for distribution to the cable plant.

Figure 1

INPUT TS (IP)

OUTPUT TS (RF)

MUX

SCRAMBLER

   QAM UPCONVERTER

Program 1

Program 1

SID/PID

CW

AC+CW+CP / ECM+CP

ECMG

SCS

Program 1

CW

CWG

INTEGRATED EQAM

    Figure 2 below shows a chassis-based Edge QAM with two linecards, and depicting how without the solution presented herein, each linecard would be separately requesting Conditional Access data.

Copyright 2016 Cisco Systems, Inc.

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Figure 2

EQAM CHASSIS

INPUT TS (IP)

OUTPUT TS (RF)

MUX

SCRAMBLER

   QAM UPCONVERTER

Program 1

Program 1 Program 1

SID/PID

CW

AC+CW+CP / ECM+CP

ECMG

SCS

Program 1 Program 1

Note doubled ECM Request/Response

for Program 1

CW

CWG

LINECARD EQAM LINECARD EQAM

OUTPUT TS (RF)

MUX

SCRAMBLER

   QAM UPCONVERTER

SID/PID

CW

AC+CW...