Functional Block Diagram - Blonder Tongue Laboratories Inc.
Functional Block Diagram - Blonder Tongue Laboratories Inc.
Functional Block Diagram - Blonder Tongue Laboratories Inc.
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Broadband Specification Guide<br />
Digital CATV (QAM) Reception - IP Distribution<br />
<strong>Functional</strong>ity<br />
Any facility that wants to utilize a digital cable television feed as a source for their analog televisions and<br />
computers will need to convert the digital signals back to analog for the analog televisions and in to an IP stream<br />
for their computers. This system will allow you to receive a digital (QAM) channel from the local cable company<br />
and distribute it to: analog televisions with IP set top boxes and PCs running IPClientViewer software. The<br />
signals are delivered via a traditional closed Ethernet distribution network, either LAN or WAN. This application<br />
assumes that there are no coaxial or hybrid fiber/coaxial networks in the facility, and that the only available<br />
distribution network is Ethernet.<br />
In Depth Description<br />
The method to utilizing a digital CATV signal as a source for an Ethernet network is to employ an AQD Digital<br />
Demodulator and an IPME-2 Internet Protocol (IP) Encoder in series. The AQD Digital Demodulator is the system<br />
component that receives the CATV digital channel and tunes to a particular program (within the channel), if<br />
multiple programs are transmitted. The AQD Digital Demodulator provides analog, NTSC baseband audio<br />
and video outputs to connect to the IPME-2 IP Encoder. The IPME-2 is the system component that receives<br />
the NTSC analog, baseband audio and video signals from the Digital Demodulator and encodes them to an<br />
MPEG-2 transport stream for distribution over a properly setup LAN or WAN. This stream has ‘real time’ video<br />
quality of 30 frames per second, full screen resolution of up to 720x480, and stereo audio. It is very important<br />
to note that the managed switches supporting the LAN or WAN MUST have the following items enabled: IGMP<br />
Snooping Querier, IGMP Snooping, and IP Multicast. These switch features are vital to the proper operation of<br />
Video over IP, and must be present in the managed switches for a proper user experience. Once the signals are<br />
on the IP network, they can be utilized by either: analog televisions via industry standard IP set top boxes or<br />
PCs running IPClientViewer software. Selecting one product from each category on the following page will<br />
insure you will have all the necessary components for a working system. Once all of the products are identified,<br />
the specifications can be looked up in the specification library at the end of this publication.<br />
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