Digital Transition - Scenario 7
Digital CATV (QAM) Reception - Analog Viewing (via IP)
| Source | Distribution Network | Viewing Location |
| Digital
CATV (QAM) |
Ethernet | PC
Running IPClientViewer |
| Explanation: | |
| This system will allow you to receive a digital (CATV) channel from the local cable company and distribute it to analog televisions with IP set top boxes and PCs running IPClientViewer software. | |
| Application: | |
| The signals are delivered via a traditional closed Ethernet distribution network, either LAN or WAN. This application assumes that there are no coaxial or hybrid fiber/coaxial networks in the facility, and that the only available distribution network is Ethernet. | |
| Component Block Diagram | Further Information |
 |
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Component Block Diagram - Details
The method to utilizing a digital CATV (clear QAM) signal as a source for an Ethernet network is to employ a digital demodulator and an Internet Protocol (IP) Encoder in series. The digital demodulator is the system component that receives the CATV digital channel and tunes to a particular program (within the channel), if multiple programs are transmitted. The digital demodulator provides analog, NTSC baseband audio and video outputs to connect to the IP Encoder.
The IP encoder is the system component that receives the NTSC analog, baseband audio and video signals from the digital demodulator and encodes them to an MPEG-2 transport stream for distribution over a properly setup LAN or WAN. This stream has “real time” video quality of 30 frames per second, full screen resolution of up to 720x480, and stereo audio.
It is very important to note that the managed switches supporting the LAN or WAN MUST have the following items enabled: IGMP Snooping Querier, IGMP Snooping, and IP Multicast. These switch features are vital to the proper operation of Video over IP, and must be present in the managed switches for a proper user experience.
Once the signals are on the IP network, they can be utilized by either: analog televisions via industry standard IP set top boxes or PCs running IPClientViewer software.
Functionality
Any facility that wants to utilize a digital cable television feed as a source for their analog televisions and computers will need to convert the digital signals back to analog for the analog televisions and in to an IP stream for their computers. This system will allow you to receive a digital (clear QAM) channel from the local cable company and distribute it to: analog televisions with IP set top boxes and PCs running IPClientViewer software. The signals are delivered via a traditional closed Ethernet distribution network, either LAN or WAN. This application assumes that there are no coaxial or hybrid fiber/coaxial networks in the facility, and that the only available distribution network is Ethernet.