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Products
Video Overlay Architecture
By implementing an analog video overlay architecture FTTx operators can
supplement their IP video, voice and data triple play by offering additional
video service that includes a traditional analog broadcast TV offering.
This video overlay presents an opportunity for subscribers to enjoy a
new, IP-based, multiple service/interactive experience without immediately
being forced to buy an IP set-top for every TV set in the home. Combining
the availability of the all-digital interactive domain with continued
access to the legacy analog video that is popular with customers, has
proven very effective in increasing overall service penetration.
For service providers, a bonus in the deployment of using Scientific
Atlanta‘s video overlay system is the opportunity to re-use the omnipresent
in-house coax wiring for TV distribution. So offer their subscribers analog TV in multiple rooms without extra wiring or otherwise necessary 2nd or a 3rd set-top box.
From an architectural point of view, the overall set up can be divided
into three main components – the headend, optical distribution and optical
network termination .
The headend receives and processes the complete lineup of
TV and, optionally, radio channels. The headend’s output is fed into video
transmitters that convert the output of the headend into an optical signal
and further amplifies it before feeding it into the optical distribution
network. Distributed along the same path as the digital services, the
signal then reaches the subscriber home, where the
ONT (Optical Network Terminal) acts as CPE to terminate both the
analog as well as the active Ethernet line. Proposed video overlay fits both Active Ethernet Point-to-Point as well as PON (Passive Optical Network) architectures and supports both two-fiber and one-fiber implementations as illustrated below.
Both two-fiber and one-fiber configurations can be implemented
as illustrated below.
The main differences between the two configurations are
the wavelengths used as well as the requirement for additional splitter/combiners
for the single fiber compared to the two fiber set up. By eliminating
the need for significant increases in POP (point of presence) and CPE
equipment costs, most operators will prefer to implement a two fiber solution.
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