05-05-2012, 02:41 PM
TRU2WAY End to End Architecture
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DBDS..
extension of the traditional cable system, incorporating digital technology with analog and thereby expanding the capacity of the traditional system and providing a platform for offering interactive services such as Internet Access and Video On Demand.
The headend provides an interface between the service infrastructure and the transport infrastructure.
The transport infrastructure provides an interconnection from the headend to hubs.
The hubs each serve an access network, which consists of HFC nodes connected via a coax bus network to DHCTs.
The transport infrastructure may utilize SONET add/drop multiplexing, analog fiber technology, or other transmission technologies.
- several lower-bandwidth streams of data into a single beam of light
- capability to add one or more lower-bandwidth signals to an existing high-bandwidth data stream
- At the same time can extract or drop other low-bandwidth signals, removing them from the stream and redirecting them to some other network path
Hybrid Fiber Co-axial...
Broadband network combines optical fiber and co-axial cable
Uses frequency division multiplexing
carry a variety of services, including analogue TV, digital TV (SDTV or HDTV), Video on demand, telephony, and high-speed data
Services on these systems are carried on Radio Frequency (RF) signals in the 5 MHz to 1000 MHz frequency band.
operated bi-directionally, meaning that signals are carried in both directions on the same network from the headend/hub office to the home, and from the home to the headend/hub office.
The forward-path or downstream) signals carry information from the headend/hub office to the home, such as video content, voice and internet data.
The return-path or upstream signals carry information from the home to the headend/hub office, such as control signals to order a movie or internet data to send an email.