JPH08116358A - Communication system - Google Patents

Abstract

PURPOSE: To remotely adjust the transmission output level of respective terminal stations from a control station by receiving control signals including transmis sion level setting information transmitted from the control station and setting a transmission level in the respective terminal stations. CONSTITUTION: The respective terminal equipments 1-1 to 1-n of the terminal stations 1-(n) are connected with the control station by a cable 3 and the desired terminal stations 1-(n) are connected through the control station. In the control station, a spectrum analyzer 10 is connected to the respective equipments 1-1 to 1-n through a distributor, and for instance, the transmission level of the terminal station 1 is measured in the analyzer 10. Based on the measured result, a controller 2 sets the transmission level, the control signals including the transmission level setting information and the calling destination terminal number of the terminal station 1 or the like, etc., are transmitted, the transmission level setting information is stored in the EEPROM of the control part 8-1 of the equipment 1-1 and the transmission output level of the respective terminal stations are remotely adjusted from the control station. Thus, without visiting a terminal equipment installation place, the transmission level is easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to setting a transmission level of each terminal station in a communication system composed of a control station and a plurality of terminal stations.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. FIG. 1 is a diagram showing a configuration example of a communication system, which is a control device 2
And a plurality of terminal stations 1 to n including terminal devices 1-1 to 1-n (n is a natural number) and the like. The terminal device 1-1 has a telephone interface unit 5-
1, a transmission unit 6-1, a reception unit 7-1 and a control unit 8-1 for controlling them. Other terminal devices 1-2 to 1-
The configuration of n is the same as that of the terminal device 1-1. During communication, for example, in the terminal station 1, the voice output signal from the telephone 4-1 is transmitted via the telephone interface 5-1 to the transmission section 6-1.
And is FM-modulated by the transmission unit 6-1 and then transmitted to the control station side via the cable 3 connected to the terminal device 1-1. The control device 2 loops back and outputs this signal to the terminal station of the other party, for example, the terminal station 2. The return signal from the control station is demodulated by the receiving section 7-2 in the terminal station 2 and output as voice from the telephone 4-2 via the telephone interface 5-2.

Here, the terminal device is usually arranged in a general household, and the length of the cable connecting the terminal device and the control device differs depending on the installation location of each terminal device.
Cable loss is also different. Therefore, it is necessary to individually set the transmission output level for each terminal device.

[0004]

However, the transmission output level of each terminal device is adjusted by the person in charge of installation work or maintenance service personnel going to the installation location of each terminal device and the transmission output level at each terminal station side. It was extremely inefficient because it was set. In addition, the circuit impedance may fluctuate when the terminal equipment is added or branched, and the transmission level set at the time of installation may be changed, but it is necessary for the person in charge of construction to go to each terminal station side each time. It was very inconvenient. The present invention has been made in view of the above circumstances, and an object thereof is to provide a communication system capable of controlling the transmission level of each terminal device very easily.

[0005]

In order to achieve the above object, the present invention provides a control station with means for transmitting a control signal including setting information of the transmission level of each terminal station, and each terminal station is provided with the control signal. A means for receiving a signal and setting the transmission level to a level corresponding to the setting information is provided, and the transmission level of each terminal station is remotely controlled from the control station side.

[0006]

As a result, it becomes possible for the control station side to easily adjust the output level of the terminal device, without the construction staff having to go to the installation location of each terminal device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Each of the terminal devices 1-1 to 1-n is connected to the control device 2 by a cable 3. During a call, for example, in the terminal station 1, the voice output from the telephone set 4-1 is given to the transmitting unit 6-1 via the telephone interface 5-1 and FM-modulated by the transmitting unit 6-1 and then the cable 3 is connected.
Is transmitted to the control station side via. Controller 2 of control station
In this case, this signal is returned and output to the terminal station of the other party, for example, the terminal station 2. The return signal from this control device is demodulated by the receiving unit 7-2 in the terminal station 2,
The voice is output from the telephone 4-2 via the telephone interface 5-2.

Next, the case where the control station side sets or changes the output level of each terminal device will be described. First, as shown in FIG. 1, on the control station side, a measuring device for detecting the level (spectrum analyzer 10 in FIG. 1) is distributed and connected by a distributor 9, and the transmission level of the terminal device is measured. Since each terminal device 1-1 to 1-n can be called from the control device 2, a specific terminal device is called and the transmission level of the terminal is measured. Here, an appropriate transmission level for the terminal device is set while observing the transmission level measured at the control station, and a control signal including this setting information and the number of the called terminal device is sent to the terminal station side. The called terminal device, after demodulating this control signal in the receiving unit,
Give to the control unit. The control unit of the terminal device stores this reception signal in the EEPROM, sets the transmission level corresponding to the level in the setting information stored in the EEPROM from the next transmission, and outputs the transmission signal.

FIG. 2 shows an embodiment of the signal structure of the control signal of the transmission output level of the terminal device. This control signal includes a type, a call type, a system code, an information code, a transmitter station individual number unused code, a control code, a called number, and a CON.
It is composed of FIG data. Here, the terminal to be changed can be set by the called number, and the setting level can be changed by the CONFIG data. Only one terminal can change the settings. If you want to change the setting level,
The FIG data is changed and the control signal is sent again. Since this control signal only changes the setting of the EEPROM of the terminal device, in order to transmit the terminal device, another transmission request signal is sent in the test mode separately. When setting the transmission level of a plurality of terminal devices, the control station individually calls each terminal station and sequentially (serially) transmits control signals to set the transmission level of each terminal device.

[0010]

As described above, according to the present invention, it becomes possible to adjust the transmission output level of the terminal device of each terminal station located away from the control station side, and the transmission output level of the terminal device can be adjusted. Adjustment becomes extremely easy.

[Brief description of drawings]

FIG. 1 is a configuration example of a communication system.

FIG. 2 is a configuration example of a control signal in the present invention.

[Explanation of symbols]

 1-1 to 1-n Terminal device 2 Control device 3 Cable 4-1 to 4-n Telephone 5-1 to 5-n Telephone interface 6-1 to 6-n Transmission circuit 7-1 to 7-n Reception circuit 8 -1 to 8-n Control circuit 9 Distributor 10 Spectrum analyzer

Claims (1)

[Claims] 1. In a communication system in which a control station and a plurality of terminal stations connected to the control station by a wired line are arranged, the control station stores setting information of a transmission level of a terminal device in each terminal station. Including means for transmitting a control signal including, the terminal station receives the control signal, has means for setting a transmission level to a level corresponding to the setting information, from the control station side of each terminal station A communication system configured to remotely control transmission levels.