Functional Block Diagram - Blonder Tongue Laboratories Inc.

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Broadband Specification Guide Inserting a Local Origination Above a Cable TV Feed Functionality This system will allow you to augment the channel line up that is being provided by the local cable TV company, and add channels made within the facility. This signal can now be handed off to a traditional coaxial distribution network or a hybrid fiber/coaxial distribution network within the facility. In Depth Description This system is a variation on a system that was mentioned earlier; “Inserting a Local Origination In To A Cable TV Feed”. This hybrid system replaces a channel on the existing cable TV line up with one that was generated locally. The key to success in this system is correctly making space for the new channel above the existing cable TV line-up. Once the band of channels to be eliminated has been identified, a low pass filter and modulator must be specified. The low pass filter makes room for the new channel by completely removing any signals above the unit’s specified cross over point. The new channel is created by the modulator, which accepts audio and video inputs and makes a cable TV channel. The low pass filter cross over point must be a lower frequency than the modulator for the system to work. The low pass filter must be a very high quality filter so that it does not harm the channels below the cross over point. The keys to the success of this system are: a high quality low pass filter to completely remove the desired band, and making sure that when the new channel is combined with the existing cable TV feed, it is done at the correct levels so that neither signal damages the others. 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. 38
Broadband Specification Guide Functional Block Diagram Inserting a Local Origination Above a Cable TV Feed FROM CATV COMPANY A A (LOW PASS FILTER) ** NOT BY BLONDER TONGUE - EAGLE COMTRONICS 800-448-7474 http://www.eaglefilters.com - MICROWAVE FILTER 800-448-1666 http://www.microwavefilter.com - PCI TECHNOLOGIES 800-565-7488 http://www.pci.com B C #__ G B F (AMPLIFIER) - RMDA 550-30P # 5500P53 - RMDA 750-30P # 5500P73 - RMDA 860-30P # 5500P83 - RMDA 860-43P # 5500P84 - BIDA 55A-30P # 5800P53 - BIDA 75A-30P # 5800P73 - BIDA 86A-30P # 5800P83 - BIDA 55A-43P # 5800P54 - BIDA 75A-43P # 5800P74 - BIDA 86A-43P # 5800P84 - BIDA 100A-30 # 5800-13 E D C (MODULATOR) - AM-60-860 /OPT. 5 # 59415A / 5905 (AGILE 860 MHz STEREO) - MAVM-861 # 7992B (FIXED CHANNEL) **THE FOLLOWING MUST BE USED WITH “G” - MICM-45C #7797C (MODULAR FIXED CHANNEL) - MICM-45S #7797S (MODULAR FIXED CHANNEL - STEREO) - AMM-806 #7763 (MODULAR - AGILE) - AMCM-860 #7766B (MODULAR-AGILE) F D (COMBINER) - OC-8D COMBINER # 5957 - OC-12D COMBINER # 5953 - OC-24E COMBINER # 5794 - OC-32E COMBINER # 5795 E (COMBINER - ALL CHANNELS GET COMBINED AT SAME LEVEL) - SXRS-2 # 1922 (COMBINES BOTH INPUTS WITH SAME LEVELS) - SRT-** 1940-** (CATV FEED AND LOCAL SOURCE ARE DIFFERENT LEVELS; TAP VALUE IS DIFFERENCE AND TAP PORT CONNECTS TO HIGHER LEVEL SOURCE) G (MODULAR RACK CHASSIS & POWER SUPPLY) - MIRC-4D # 7711 (4 SLOT CHASSIS & POWER SUPPLY) - MIRC-12V # 7715 (12 SLOT CHASSIS) - MIPS-12C # 7722C (12 UNIT POWER SUPPLY) BLONDER TONGUE LABORATORIES INC. OLD BRIDGE, NEW JERSEY 08857 DRAWN ENGINEER 07/31/06 WNW DWG NO. AC-021405I 39 39
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