The present invention provides a hybrid central/distributed and tiered
video on demand (VOD) service network with tiered content structure. In
particular, the present invention uses media servers located in both the
headend station and the hub stations. Set-top boxes generally would be
supplied VOD services from the high-demand content media servers located
in the hub station nearest to the user. The central media server located
in the headend would be used as an installed backup to the hub media
servers; as the primary source for lower demand VOD services and as the
source of the real time, centrally encoded programs with PVR (personal
video recorder) capabilities.By distributing the servers to the hub
stations, the size of the fiber transport network associated with
delivering VOD services from the central headend media server is reduced.
The invention provides that each user has access to several server ports
located on at least two servers. Multiple paths and channels are
available for content distribution to each user, assuring high system
reliability and enhanced asset availability. Substantial cost benefits
are derived from the reduced need for a large content distribution
network and the reduced storage capacity requirements for hub servers.