JPH04321333A - Equipment in video transmission station - Google Patents

Abstract

PURPOSE:To enable the equipment in the video transmission station enough to use one subrack frame when an in-station termination section and a branch section are required in one and the same station. CONSTITUTION:An in-station termination transmission section 20 converting a bipolar signal 5 and an optical output signal 7 and a branch section 30 branching a bipolar signal 8 are mounted in the equipment 10 in the video transmission station with compatibility. The in-station termination transmission section 20 is provided with a bipolar unipolar conversion circuit 1 terminating the bipolar signal 5 through a transmission line and converting the signal again into the optical output signal 7 and the bipolar output signal 6, a transmission line termination circuit 3, an electrooptic converter 4, and a unipolar/bipolar conversion circuit 2. The branch section 30 is provided with a bipolar unipolar conversion circuit 9 converting the bipolar input signal 8 into a unipolar signal, branching and converting it into bipolar output signals 13, 14, 15 again and unipolar and bipolar conversion circuits 10, 11, 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video transmission station device which is a video transmission system in-house device for transmitting video signals and audio signals using digital signals.

0002

[Background Art] Conventional video transmission station equipment terminates a bipolar signal, which is a digital video signal or audio signal, on a transmission path, converts this bipolar signal into an optical output signal and a unipolar signal, and outputs the converted signal. It had only an intra-office termination transmitting section or an intra-office termination receiving section which terminated the transmission line of the optical input signal and produced a bipolar output signal.

0003

[Problem to be Solved by the Invention] This conventional video transmission intra-office device has only an intra-office termination section called an intra-office termination transmitting section or an intra-office termination receiving section.
When both branch sections for branching and connecting video signals are required in the same station building, one subrack will not fit.
There was a drawback that a second subrack had to be prepared.

0004

[Means for Solving the Problems] A video transmission in-office device of the present invention has an in-office termination section for converting a bipolar signal and an optical signal, and a branching section for branching the bipolar signal, wherein the in-office termination section and the branch section are implemented in a compatible manner.

Preferably, the intra-office termination section includes a first bipolar-unipolar conversion circuit that converts the first bipolar signal into a first unipolar signal, and a first bipolar-unipolar conversion circuit that terminates the first unipolar signal into a first unipolar signal. and a transmission line termination circuit that outputs the signal to the second output end; an electric-to-optical converter that converts the unipolar signal from the first output end into an optical output signal; a first unipolar-bipolar conversion circuit that converts a unipolar signal into a second bipolar signal; and second to fourth unipolar-bipolar conversion circuits that convert the second unipolar signal into fourth to sixth bipolar signals, respectively.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which one system each of an in-office termination transmitting section and a branching section is installed in a video transmission in-office device.

[0008] The intra-office termination transmitter 20 of the video transmission intra-office device 100 receives the bipolar input signal 5 from the terminal 21 . A bipolar/unipolar conversion circuit (B/U) 1 converts a bipolar input signal 5 into a unipolar signal and outputs it to a transmission line termination circuit 3. The transmission line termination circuit 3 terminates the input unipolar signal and outputs it to first and second output ends. An electric/optical converter (E/O) 4 converts the unipolar signal from the first output end of the transmission line termination circuit 3 into an optical output signal 7 . The unipolar/bipolar conversion circuit (U/B) 2 converts the unipolar signal from the second output end of the transmission line termination circuit 3 into a bipolar output signal 6, and outputs it from the terminal 21.

The terminal 21 of the in-station terminal transmitter 20 inputs and outputs power, alarm monitoring signals, etc. in addition to bipolar (input/output) signals 5 and 6, and is connected to a terminal 101 provided in the video transmission in-station device 100. input and output these signals to and from the The optical output signal 7 is output from an optical terminal (not shown) provided in the intra-office termination transmitter 20 .

[0010] The branching section 30 of the video transmission station device 100 includes:
A bipolar input signal 8 is input from a terminal 31 (shown separately as 31a and 31b). The bipolar/unipolar conversion circuit 9 converts the bipolar input signal 8 into a unipolar signal, branches it, and outputs it to the first to third output terminals. The unipolar signals from the first to third output terminals of the bipolar/unipolar conversion circuit 9 are converted into bipolar output signals 13 to 15 by the unipolar/bipolar conversion circuits 10 to 12, respectively, and output from the terminal terminal 31. .

The terminal 31 of the branch unit 30 inputs and outputs bipolar (input/output) signals 8, 13, 14, 15 as well as power supply, alarm monitoring signals, etc., and is arranged in the video transmission station equipment 100. These signals are input and output to the terminal 102.

[0012] Here, terminals having the same structure are used as the terminal 21 of the intra-office termination transmitting section 20 and the terminal 31 of the branching section 30,
In addition, the terminal numbers of these terminals are designated such that common signals such as bipolar input signals 5 and 8 and bipolar output signals 6 and 13 are designated with the same terminal number, and signals that are not common are designated so that the terminal numbers do not overlap. Further, the external shape and dimensions of the intra-office termination transmitting section 20 and the branching section 30 are made to be the same to the extent that both can be installed in the video transmission intra-office device 100 with compatibility. Therefore, the intra-office termination transmitting section 20 and the branching section 30 are compatible in terms of implementation in the video transmission intra-office device 100.

FIG. 2 is a diagram showing an example of the number of in-office termination transmitting sections 20 and branching sections 30 installed in three systems in the embodiment of FIG. 1. in this way,
When it is possible to implement three systems including the intra-office termination transmitting section 20 and the branching section 30 in the video transmission intra-station device 100, the video transmission intra-office device 100 can be implemented in four ways.

[0014] Above, the explanation has been given using an example of an intra-office termination transmitting section as an intra-office termination section, but it is possible to use a branch section interchangeably in the case of an intra-office termination receiving section instead of an intra-office termination transmitting section. Of course.

[0015]

Effects of the Invention As explained above, the video transmission in-station device of the present invention can implement the in-office termination section, especially the in-office termination transmitting section, and the branching section with compatibility. When both subracks are required within the same station, there is no need to prepare two subracks for video transmission equipment within the station, and the station building can be used efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a diagram showing an example of implementation of the video transmission station device in FIG. 1;

[Explanation of symbols]

1,9 Bipolar/unipolar conversion circuit (B/
U) 2, 10, 11, 12 Unipolar/bipolar conversion circuit (U/B) 3 Transmission line termination circuit 4 Electrical/optical conversion circuit ((E/O) 5, 8
Bipolar input signal 6, 13 Bipolar output signal 7 Optical output signal 20 In-office termination transmitter 21, 22, 31 (31a, 31b), 101, 102
Terminal 30 Branch unit 100 Video transmission station equipment

Claims (2)

[Claims] 1. An in-office termination section that converts a bipolar signal and an optical signal, and a branch section that branches off the bipolar signal, and the in-office termination section and the branch section are implemented in a manner compatible with each other. A video transmission station device characterized in that: 2. The intra-office termination section includes a first bipolar-unipolar conversion circuit that converts a first bipolar signal into a first unipolar signal, and a transmission line termination circuit for terminating the first unipolar signal to a first and second unipolar signal. a transmission line termination circuit that outputs to a second output end; an electric-to-optical converter that converts the unipolar signal from the first output end into an optical output signal; a first unipolar-bipolar conversion circuit that converts a unipolar signal into a second bipolar signal;
a unipolar conversion circuit; and a second unipolar conversion circuit that converts the second unipolar signal into fourth to sixth bipolar signals, respectively.
3. A video transmission in-station device, comprising: a fourth unipolar/bipolar conversion circuit.