JPS6314532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an order wire system via a satellite that performs transmission and reception by sharing one wave frequency, and relates to a connection method for a large number of order wire devices.

Conventionally, it has been common for one earth station to have one order wire device of this type. And if you need a large number of order wire devices, FM MODEM
This system requires the same number of order wire devices as there are order wire devices, and has the disadvantage that each order wire device must have a called number. Furthermore, when a large number of order wire devices are connected in multiple ways, there is a drawback that even when any one order wire device is transmitting, it is possible for an interrupt from another order wire device to occur, resulting in interference.

When a large number of order wire devices are installed at one earth station, the present invention provides a transmission priority circuit for each order wire device and a circuit that can connect receiving lines to other order wire devices in multiple ways. To provide an order wire connection system which eliminates the above-mentioned drawbacks by prohibiting other order wire devices from transmitting while one order wire device is transmitting, and allowing all order wire devices to receive data during reception.

Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention, and is a block diagram when two order wire devices are connected to an earth station in multiple ways.

In the figure, the FM connected to antenna 1
The receiving line multi-connection circuit 5 and the transmission priority circuit 9 of the order wire device 3 are connected to the MODEM 2. In the receiving line multi-connection circuit 5, the receiving circuit 7 and the receiving line multi-connection circuit 6 of the order wire device 4 are multi-connected. A transmission circuit 11 and a transmission priority circuit 10 of the order wire device 4 are connected to the transmission priority circuit 9 . In the order wire device 4, a reception circuit 8 is connected to the reception line multi-connection circuit 6, and a transmission circuit 12 is connected to the transmission priority circuit 10. When an order wire device is added, a similar connection configuration is used.

Next, the transmission/reception operation will be explained.

When transmitting from the order wire device 3, the transmission priority circuit 9 switches the transmission line to the transmission circuit 11 of the order wire device 3, and at the same time sends a transmission prohibition signal 13 to the transmission priority circuit 10 of the order wire device 4. Prohibit sending from. Then, the incoming call number from the destination earth station from the transmission circuit 11 passes through the transmission priority circuit 9, the FM MODEM 2, and the antenna 1, and is sent to the order wire device of the destination earth station via the satellite.

On the other hand, when making a call from the order wire device 4,
The transmission priority circuit 10 switches the transmission line to the transmission circuit 12 of the order wire device 4, and at the same time sends a transmission prohibition signal 14 to the order wire device 3 to prohibit transmission from the order wire device 3. Transmission circuit 1
The destination earth station incoming number from 2 is transmission priority circuit 1
0, transmission priority circuit 9 of order wire device 3, FM
It passes through MODEM 2 and antenna 1 and is sent to the order wire device of the destination earth station via the satellite.

With this method, no interference occurs.

The signal from the order wire device of the partner earth station is
The signal passes from the antenna 1 and the FM MODEM 2 to the receiving line multi-connection circuit 5 of the order wire device 3 and is received by the receiving circuit 7, and simultaneously passes through the receiving line multi connection circuit 6 of the order wire device 4 and is also received by the receiving circuit 8.

In this way, when receiving a call, since any order wire device can receive the call, only one type of call number is required.

As explained above, the present invention provides each order wire device with a transmission priority circuit and a circuit that can connect to other order wire devices in multiple ways, and when a large number of order wire devices are connected in multiple ways, any one
Interference is prevented by prohibiting transmission from other order wire devices while one order wire device is transmitting, and by allowing all order wire devices to receive when receiving, one FM MODEM can transmit
The advantage is that a large number of order wire devices can be connected to the earth station, and only one terminating number is required.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention, and is a block diagram in which two order wire devices are connected in multiple ways. 1: Antenna, 2: FM MODEM, 3, 4:
Order wire device, 5, 6: reception line multi-connection circuit, 7, 8: reception circuit, 9, 10: transmission priority circuit, 11, 12: transmission circuit, 13, 14: transmission prohibition signal.

Claims (1)

[Claims] 1. In an orderwire system via a satellite that transmits and receives by sharing one wave frequency, when connecting a large number of orderwire devices to the earth station, which is a component of the system, each orderwire device is equipped with a transmission priority circuit and other orderwire devices. An order wire device characterized in that a circuit is provided that allows multiple connections between devices and receiving lines, and when any one order wire device is transmitting, transmission of other order wire devices is prohibited, and when receiving, all order wire devices are allowed to receive. Connection method.