JPH0536946U - Line termination board for multimedia multiplexer - Google Patents

Abstract

(57) [Summary] [Purpose] To enable quick specification of specifications and quick response by changing specifications. [Structure] The X21 line terminal board has a structure in which a direct connection circuit 2, a cross connection circuit 3 and a switch 5 for selecting and switching either the direct connection circuit 2 or the cross connection circuit 3 are added.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a connection between a multimedia multiplexer and a terminal, and more particularly to a line termination board for a multimedia multiplexer for realizing connection switching in the case of direct connection and in the case of tandem connection with a transmission device. Is.

[0002]

[Prior Art]

 For conventional connection type switching, a straight cable was arranged for direct connection, and a cross cable was arranged for tandem connection with other transmission equipment. That is, as shown in (a) and (b) of FIG. 3, which shows an example of conventional connection form switching, either one of two types of cables, a straight cable and a cross cable, is used depending on the connection form. Therefore, the signal was switched.

In FIG. 3, (a) shows a straight (direct) connection, and (b) shows a cross (cross) connection. Reference numeral 21 shown in FIG. 3A is a multimedia multiplexer, 22 is a terminal, and 23 is a straight cable that connects the multimedia multiplexer 21 and the terminal 22. In FIG. 3B, 24 is a multimedia multiplexing device, 25 is a terminal, 26-1 and 26-2 are transmission devices, 27 is a multimedia multiplexing device 24 and a cross ( Crossing) cable.

[0004]

[Problems to be solved by the device]

 In this conventional connection form switching means, it is necessary to accurately grasp the number of straight cables and finelli cables in advance, which is one of the causes of delaying specification determination. Even with the specifications that were decided once, there was a problem in that if the connection configuration changed due to changes in the layout of the equipment, the other cable would be urgently dispatched again.

[0005]

[Means for Solving the Problems]

 The line termination board for multimedia multiplexer of the present invention comprises a line termination circuit for X21 interface, a 15-pin connector for X21 interface, a direct connection circuit, a cross connection circuit, the direct connection circuit or the cross connection circuit. Either one of them is selected, and a switch for switching the connection to the X21 interface line termination circuit and the connection to the X21 interface 15-pin connector is provided. A line termination board for a multimedia multiplexer according to another aspect of the present invention comprises a line termination circuit for RS449 interface, a 37-pin connector for RS449 interface, a direct connection circuit, a cross connection circuit, and the direct connection circuit. Either the connection circuit or the cross connection circuit is selected, and a line terminating circuit for the RS449 interface and a switch for switching the connection to the 37-pin connector for the RS449 interface are provided.

[0006]

[Action]

 In the present invention, either a direct connection circuit or a cross connection circuit is provided by a switch between the line termination circuit for the X21 interface and the 15-pin connector or between the line termination circuit for the RS449 interface and the 37-pin connector for the RS449 interface. Select and switch connection.

[0007]

【Example】

 FIG. 1 is a block diagram showing an embodiment of a line termination board for a multimedia multiplexer according to the present invention. In FIG. 1, 1 is a line termination circuit for the X21 interface, 2 is a straight (direct) connection circuit, 3 is a cross (cross) connection circuit, 4 is a 15-pin connector for the X21 interface, and 5 is a direct connection circuit 2 or cross. This is a switch for selecting one of the connection circuits 3 and switching the connection to the line termination circuit 1 for the X21 interface and the 15-pin connector 4 for the X21 interface.

Next, the operation of the embodiment shown in FIG. 1 is performed for each of the signals for transmission data T, reception data R, control C, indication I, signal element timing (clock) S, transmission timing ST. The description will be given with reference to the connector in which the input / output pins are arranged. First, when the multimedia multiplexer and the terminal are directly connected, the signal is normally transmitted by connecting the switch 5 to the direct connection circuit 2 side. Next, when the transmission device having the X21 interface is connected in tandem between the multimedia multiplexer and the terminal, the switch 5 is connected to the cross connection circuit 3 side so that the signal T of the transmission data is transmitted to the reception data. The control signal C is transmitted to the pin R, the indication I is transmitted, and the clock S is transmitted to the transmission timing pin ST _1, respectively. As a result, the signal can be transmitted normally.

As described above, since the connection conversion processing is performed only by the X21 line terminal board with the connection form switching function for the multimedia multiplexer, the specification can be determined early.

FIG. 2 is a block diagram showing another embodiment of the present invention. In FIG. 2, 11 is a line termination circuit for RS449 interface, 12 is a straight (direct connection) connection circuit, 13 is a cross (cross connection circuit), 14 is a 37-pin connector for RS449 interface, and 15 is a direct connection circuit 12 or cross. This is a switch for selecting one of the connection circuits 13 and switching the connection between the RS449 interface line termination circuit 11 and the RS449 interface 37-pin connector 14.

Next, the operation of the embodiment shown in FIG. 2 will be described with reference to a connector in which input / output pins for signals SD, ST, RD, RS, RT, CS, TR, RR, ST, SC and RC are arranged. This will be described with reference to the data. First, when the multimedia multiplexer and the terminal are directly connected, the switch 15 is connected to the direct connection circuit 12 side to normally transmit the signal. Next, when the transmission device having the RS449 interface between the multimedia multiplexer and the terminal is connected in tandem, by connecting the switch 15 to the cross connection circuit 13 side, the signal RD is connected to the pin SD and the signal RR is connected to the pin. The RS, the signal DM, and the clock RT are transmitted to the pin TR and the pin ST ₁ , respectively. As a result, the signal can be transmitted normally.

As described above, since the connection changing process is performed only by the RS449 line terminating board with the connection type switching function for the multimedia multiplexer, the specification can be determined early.

[0013]

[Effect of the device]

 As described above, the present invention provides a direct connection circuit and a cross connection circuit between the X21 interface line termination circuit and the 15-pin connector or between the RS449 interface line termination circuit and the RS449 interface 37-pin connector by a switch. Since either one of them is selected and connected, only the X21 line terminal board with connection type switching function for multimedia multiplexing equipment or the RS449 line terminal board with connection type switching function for multimedia multiplexing equipment is connected. Since conversion processing is performed, it has an effect that specifications can be determined early. From this effect, there is no need to make urgent cable arrangements due to specification changes, etc. as before, so there will be no trouble, and it will be possible to deal with the problem on-site for a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a line termination board for a multimedia multiplexer according to the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing an example of conventional connection mode switching.

[Explanation of symbols]

 1 X21 Interface Line Termination Circuit 2 Direct Connection Circuit 3 Cross Connection Circuit 4 X21 Interface 15 Pin Connector 5 Switch 11 RS449 Interface Line Termination Circuit 12 Direct Connection Circuit 13 Cross Connection Circuit 14 RS449 Interface 37 Pin Connector 15 Switch

Claims (2)

[Scope of utility model registration request] 1. A line termination circuit for an X21 interface, a 15-pin connector for an X21 interface, a direct connection circuit, a cross connection circuit, and either the direct connection circuit or the cross connection circuit is selected, and the X21 is selected. A line terminating board for a multimedia multiplexer, comprising a line terminating circuit for an interface and a switch for switching connection to the 15-pin connector for the X21 interface. 2. A line termination circuit for RS449 interface, a 37-pin connector for RS449 interface, a direct connection circuit, a cross connection circuit, and either the direct connection circuit or the cross connection circuit is selected, and the RS449 is selected. Interface line termination circuit and the RS4
A line terminating board for a multimedia multiplexer, which is provided with a switch for switching connection to a 37-pin connector for 49 interface.