Local area network coaxial cable connection device
First Claim
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1. Device for connection of a transmitter/receiver (9) to a coaxial cable (1) serving as a serial bus in a local area network, comprising:
- an inductance (2), in the form of a printed-circuit pass-through filter inductance having two single-loop windings (17,
18), interposed in the center conductor of said coaxial cable (1), said inductance having a central tap (3); and
a further coaxial cable (7) interconnecting said central tap (3) and said transmitter/receiver (9), and wherein said further coaxial cable (7) has, at most, a length which gives rise to a capacitance 8 pF greater than the capacitance which, together with said inductance (2), defines the characteristic impedance of said coaxial cable forming said serial bus.
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Abstract
The possible length of tap lines to the serial bus of a local area network is extended to about 0.7 meter by inserting an inductance 2 into the serial bus 1, and connecting a further coaxial cable 7 to a central tap 3 of the inductance. Preferably, the inductance 2 is a printed-circuit pass-through filter. The longer tap lines are particularly useful for connection of rack-mounted digital equipment in broadcasting studios, where it is inconvenient to place the equipment directly adjacent to a typically floor-level network cable.
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Citations
13 Claims
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1. Device for connection of a transmitter/receiver (9) to a coaxial cable (1) serving as a serial bus in a local area network, comprising:
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an inductance (2), in the form of a printed-circuit pass-through filter inductance having two single-loop windings (17,
18), interposed in the center conductor of said coaxial cable (1), said inductance having a central tap (3); anda further coaxial cable (7) interconnecting said central tap (3) and said transmitter/receiver (9), and wherein said further coaxial cable (7) has, at most, a length which gives rise to a capacitance 8 pF greater than the capacitance which, together with said inductance (2), defines the characteristic impedance of said coaxial cable forming said serial bus. - View Dependent Claims (2, 3, 4)
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5. Device for connection of a transmitter/receiver (9) to a first coaxial cable (1) serving as a serial bus in a local area data communication network, comprising:
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an inductance (2) interposed in series in the inner conductor of said first coaxial cable (1), having an inductive winding connected at its ends to respective ends of said first coaxial cable inner conductor resulting from an interruption of said inner conductor provided so as to permit interposition of said inductance, and also having a center tap (3); and a second coaxial cable (7) having a first end thereof at which its inner conductor is connected conductively and directly to said center tap of said inductance, its outer conductor being connected conductively to the outer conductor of said first coaxial cable, and having a second end connected to said transmitter/receiver (9). - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification