Cisco Headend Digital Broadband Delivery System Technical References
CVT and Generic QAM Technical
Reference
Reference
Overview
Introduction
Our engineers are aware of a condition that can result in excessive set-top reboots
after channel or frequency changes associated with generic QAMs that support
Switched Digital Video (SDV) and Video On-Demand (VOD). This condition,
commonly referred to as "stale CVT," occurs when the CVT on a QAM does not
match the Digital Network Control System (DNCS). If your site uses generic
QAMs for SDV or VOD, you can set up the DNCS to stop sending RPC CVT insert
packets to the generic QAMS to prevent this condition from occurring.
after channel or frequency changes associated with generic QAMs that support
Switched Digital Video (SDV) and Video On-Demand (VOD). This condition,
commonly referred to as "stale CVT," occurs when the CVT on a QAM does not
match the Digital Network Control System (DNCS). If your site uses generic
QAMs for SDV or VOD, you can set up the DNCS to stop sending RPC CVT insert
packets to the generic QAMS to prevent this condition from occurring.
Purpose
This technical reference provides instructions to configure DNCS to exclude
generic QAMS from receiving RPC CVT insert packets.
generic QAMS from receiving RPC CVT insert packets.
Audience
This document is indended for DNCS operators of networks as described below:
Operating DBDS System Release 4.3.0 or higher
Using SDV and/or VOD
Using generic QAMs
Support engineers who help system operators troubleshoot and maintain systems
will also find this document useful.
will also find this document useful.