Functional Block Diagram - Blonder Tongue Laboratories Inc.

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Broadband Specification Guide Coaxial Distribution Functionality This type of distribution system is the link between the central signal source (Headend) and the televisions that are scattered throughout the facility. This network relies entirely on traditional coaxial cable to distribute the desired signals. In Depth Description Trunk and Branch: This type of distribution network is the most common architecture deployed today. The basic premise is that there is a system of “Trunks”, or large distribution lines carrying high signal levels away from the headend, running through out the facility. As this large cable runs through the facility, at many locations, there needs to be “Branches”, or smaller lines carrying signals to individual TVs. These smaller lines are often called “drops” and are created by “tapping” into the “Trunk” line with a mechanical device known as a tap, or directional coupler. Amplification may be needed in order to provide signal though out the entire facility. Considerations should be made in order to have power available outside of the “Headend” in either remote closets, or by injecting power in to the coaxial network itself. Home Run: This type of distribution network is usually only deployed in smaller facilities. The basic idea is that all of the TVs have their signal directly run to them from one central point, or “Home Run”. This direct, point to point wiring can not be used in large facilities because of the signal loss inherent to copper based cables. At the headend, there must be enough RF output ports available for each “Home Run”, as well as AC power to power any amplifiers that might be required. Star: This type of distribution network is most often deployed by the data and telephone industries, but can also be applied to some facilities for coaxial distribution. The “Star” architecture is a hybrid of the “Trunk and Branch” and “Home Run”. Starting at the headend, large “Trunk” lines are run out in to the facility to several different points. From these distribution points smaller cables, “Drops”, are then “Home Run” out to the individual TVs. Considerations should be made in order to have power available outside of the “Headend” in either remote closets, or by injecting power in to the coaxial network itself. Cable Types: Special consideration must be given to the cable types employed in any architecture to ensure that the proper cable for the application is selected. All of the cables used in the distribution networks described above MUST be CATV rated as defined by National Electric Code, Article 820. There are two factors that must be looked at to determine the correct cable; the location within the facility, and the location within the network. When referring to the location within the facility, we are looking at the physical location in the facility where the cable is going to be installed. The National Electric Code in Article 820 dictates the correct ratings for coaxial cables based upon the location that the cables are going to be installed. The ratings are: CATVP CATVR CATV CATVX CATVU Plenum Riser General Commercial External - No more than 50’ in to the building Underground The chart above is for reference purposes only, the specifier/designer must become familiar with the National Electric Code, and design to their guidelines. When referring to the location within the network, we are talking about the use of the cable. Is the cable a “Trunk”? Is the cable a “Drop”? Is the cable a “Home Run”? The most common “Trunk” cables are RG-11 and .500 hard line, these larger cables are designed to carry signals over long distances. All “Drop” cables should be RG-6 or larger depending on the length of the “Drop”. Any coaxial run over 250’ should be RG-11 in order to facilitate the design of the network. The only use for RG-59 cable is to connect a VCR to a TV, or connect the TV to the wall plate in a room. 46
Broadband Specification Guide Functional Block Diagram Trunk and Branch Coaxial Distribution C FROM CATV INPUT OR OUTPUT OF HEADEND B A TRUNK CABLE RG-11 or RG6 D A B C D (AMPLIFIER) - RMDA 550-30P # 5500P53 - RMDA 750-30P # 5500P73 - RMDA 860-30P # 5500P83 - RMDA 860-43P # 5500P84 - RMDA 86A-30 # 5200-83 - 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 (TWO WAY SPLITTER) - SXRS-2 # 1922 (THREE WAY SPLITTER) - SXRS-3 # 1923 (FOUR WAY SPLITTER) - SXRS-4 # 1924 E E (EIGHT WAY SPLITTER) - SXRS-8 # 1928 TRUNK CABLE RG-11 or RG6 F F G (SINGLE PORT TAP OR DIRECTIONAL COUPLER) - SRT-** # 1940-** (SINGLE PORT - ** INDICATES TAP VALUE) (TWO PORT TAP OR DIRECTIONAL COUPLER) - SRT-2A-** # 1942-** (TWO PORT - ** INDICATES TAP VALUE) G H (FOUR PORT TAP OR DIRECTIONAL COUPLER) - SRT-4A-** # 1944-** (FOUR PORT - ** INDICATES TAP VALUE) H I (EIGHT PORT TAP OR DIRECTIONAL COUPLER) - SRT-8A-** # 1948-** (EIGHT PORT - ** INDICATES TAP VALUE) I J J K (TERMINATOR) - BTF-TP # 4670 (WALL PLATE) - V-1GF-FT # 3187 - TF-GF-FT # 4691 DROP CABLE RG-6 200' MAX. WALL PLATE K RG-59 50' MAX TELEVISION ** PASSIVE COMPONENTS (SPLITTERS AND TAPS) ARE LOCATED THROUGHOUT DISTRIBUTION SYSTEM AS REQUIRED TO PROVIDE SUFFICIENT SIGNAL TO ALL OUTLETS. BLONDER TONGUE LABORATORIES INC. OLD BRIDGE, NEW JERSEY 08857 DRAWN ENGINEER 07/31/06 WNW DWG NO. AC-021405M 47 47
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Functional Block Diagram - Blonder Tongue Laboratories Inc.

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