Switched Digital Video - Motorola APEX1000 Installation And Operation Manual

Switched Digital Video

Switched Digital Video (SDV) is a system feature that allows channels on the broadcast
line-up to be dynamically switched on and off the HFC network as a function of real time
subscriber viewing, such as channel changes. In an SDV environment, channels that are
not being watched by any subscribers on a given segment of the HFC network (in a
given service group) can be temporarily removed from the HFC network to make room
for other channels that subscribers do want to watch. In a network which is properly
working, SDV channels and traditional broadcast (linear) channels are indistinguishable to
the subscriber. However, using SDV, an MSO can offer a given set of channels that use
half (or less) of the HFC bandwidth, as compared to the linear broadcast method.
As previously discussed in
architectures that address SDV, RPC and RTSP.
RPC Mode SDV
The figure below illustrates the RPC Mode SDV architecture:
TWC
Conductor
DAC to
Conductor I/F
RDS
DAC
SDV
Rate
Clamp
Central Location (i.e. Headend) Remote Location (i.e. Hub)
MPEG over GigE
MPEG over QAM
MPEG over various transports/media
Control Signaling
Note: Shown with Motorola components, as well as the Time Warner Conductor
required to support the TWC guide/SDV client (MDN/ODN) running in the set-top.
Overview • Operating Modes
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
Session-Oriented
EPG Data Carousel (via DSG or ALOHA)
GSRM
Network
I/F
Encryptor
(Mini Carousel)
IP/GigE
Switch
Router
Content
Distribution
(typically GigE
over DWDM)
VOD, there are also two major industry
SSP-SIS
Manager
GSRM/Edge
(EDIS_Edge)
MCMIS SDV Server/Edge
(EDIS_SDV)
IGMPv3
Joins
IP/GigE
Switch APEX
MPEG via
Router
UDP/IP/GigE
MCMIS
CCMIS
SDV
(via ALOHA
or DOCSIS)
STB Client
(Core or
Advanced)
MPEG
over
QAM
MCMIS
B
15