Cisco Headend System Release 2.7 Guida Alla Progettazione

 

4024319 Rev B 

5 

 

 

 

In general, systems implementing SDV can continue to support other popular 
applications and technologies as described in this section. 

 

Most system applications will be transparent to SDV. However, applications wishing 
to share QAM modulators with SDV must strictly adhere to established standards 
for QAM modulator use. This requirement prevents SDV and VOD from 
independently sending streams to QAM modulators and overflowing channels that 
can cause service disruptions. 

Important: A key specification that VOD systems must adhere to is the Time Warner 
Cable Session Setup Protocol version 2.3 (SSP2.3). Systems must comply with this 
specification before deploying the DBDS system release supporting SDV, if the 
systems intend to share QAM modulators. 

 

The SDV system uses the standard Internet protocol (IP) to communicate with set-
tops. It does not matter to the system whether set-tops are communicating with the 
headend using either the Digital Audio Visual Council (DAVIC) protocol with 
DAVIC modulators/demodulators or the DOCSIS (DSG) protocol with DOCSIS 
Cable Modem Termination Systems (CMTSs). The SDV system will operate through 
either protocol. 

 

The SDV system does not rely on any specific video or audio coding standards. It is 
based on standard MPEG transport packets over IP. Therefore, an SDV system will 
support any of today's coding standards including MPEG-2, H.264, and VC-1 as well 
as any future coding standard that can be carried in MPEG transport packets.