Functional Block Diagram - Blonder Tongue Laboratories Inc.

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Broadband Specification Guide Sub-Channel Return Functionality The sub-channel return allows signals (VCR, DVD, Studio Cameras, Security Cameras, Character Generators, Computer Outputs) generated anywhere in the facility to be included in the channel line up at that facility. The sub-channel return system is a type of system that takes advantage of the two-way transmission capability inherent to coaxial cable. When the proper electronics are installed, an audio and video signal can be generated anywhere within the coaxial network and redistributed to all televisions connected to the network. In Depth Description There are three key ingredients in the sub-channel return system that must be in place in order for the system to work. The first is the sub-channel modulator. This device takes an audio and video from any standard source (Camera, DVD Player, VCR Player, and Computer Video Card), and transmits them back to the headend (the source point of all the signals in the coaxial distribution network). Once the signal leaves the sub-channel modulator, its next stop is a diplexer. The diplexer’s job is to create a two way street within the coaxial network so that the signal you have just created can travel back to the headend. The next stop for the signal is another diplexer at the headend; this one is there to break the two signal paths apart. It is very important that there are two diplexers in the system so that the signal can be combined and then taken back apart. At the headend, there needs to be a piece of electronics to catch the signal that was generated in the field, and turn it around to go back out to the coaxial distribution network. There are many different units that can perform this task; the main concern is to make sure that there is an available space for the new channel. If you pick one product from each category on the next page, you will have all of the components to ensure a working design. Once all of the products are identified, the specifications can be looked up in the specification library at the end of this publication. 40
Broadband Specification Guide Functional Block Diagrams Sub-Channel Return Using Processors #T-_ A (PROCESSOR) - AP-60-550B/OPT. 17 # 59817/59177 (AGILE 60 dBmV) A #__ B (COMBINER) - OC-8D COMBINER # 5957 - OC-12D COMBINER # 5953 - OC-24E COMBINER # 5794 - OC-32E COMBINER # 5795 B 54-1000 MHz DC-42 MHz C COMBINED TO DISTRIBUTION SYSTEM D C (DIPLEX FILTER) - DSV-42 DIPLEXER # 4376 #T-_ TO LOCAL TELEVISION 54-1000 MHz DC-42 MHz D (MODULATOR) - AM-60-550/OPT. 4 # 59416/5904 (AGILE 60 dBmV) - MAVM-861-T** # S7992B (FIXED CH. 40 dBmV) - MAVM-60-861-T** # S7977B (FIXED CH. 60 dBmV) C COMBINED TO/FROM ANY OUTLET BLONDER TONGUE LABORATORIES INC. OLD BRIDGE, NEW JERSEY 08857 DRAWN ENGINEER 01/03/08 WNW DWG NO. AC-021405K 41 41
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Functional Block Diagram - Blonder Tongue Laboratories Inc.

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