Introduction,
Continued
VOD Servers
Video servers are powerful servers that are able to playout huge amounts of video
data requests at the same time. They share a single copy of content among
subscribers using the data stripping method. Data stripping splits the data into
several blocks that are written to separate hard disks. This method increases the
output while several parts of the movie are simultaneously read from the disks
without causing excessive delay.
Some key performance parameters of VOD servers are:
•
Storage capacity
This specification determines the number of movie titles that can be stored on the
video server. Video servers generally configure the hard drives in RAID arrays.
The capacity of hard drives is continuously growing and doubles about every 12
months.
•
Delivery capacity
The delivery capacity is the rate at which the video server can play out the video
streams.
Management Tools
A System Resource Manager manages the system resources in terms of storage and
communication bandwidth. In many cases, subscribers compete for the same
popular system resources (popular movies) at the same time. The System Resource
Manager must apply an efficient scheme that ensures fairness of allocation.
The Billing Manager communicates transactions to a billing system for the purpose
of charging subscribers for the use of VOD services.
Network Transport Systems
There are different options to transport VOD services to your subscriber. The final
choice depends on the available distribution network infrastructure, delivery cost
per video stream and scalability of the network transport system.
Some examples are:
•
SONET/SDH TS transport (e.g. iLynx)
•
MPEG-2 over ATM over SONET/SDH
•
MPEG-2 over UDP/IP over Gigabit Ethernet over SONET/SDH (e.g. Prisma GbE)
4004949 Rev C
Video On Demand
B-3
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