JPS6119243A - Dama communication equipment - Google Patents

Abstract

PURPOSE:To attain surely simultaneous talking by using forced simultaneous information from a central station to transmit a forced simultaneous end of call tone to all terminal lines during operation at present by each terminal station and urge the end of call of a subscriber thereby realizing simultaneous talking afterward. CONSTITUTION:A DAMA device 21 of a central station of a DAMA device is provided with a common signal line 22 and a DAMA device 23 of a terminal station is provided with a common signal line 25. Further, a forced simultaneous end of call tone generator 24 is arranged to the device 23, and when the generator 24 receives a forced simultaneous signal from the device 21 via a terminal device 14, a forced end of call tone urging the end of call processing is given to all terminal lines during operation at present. Further, a simultaneous talking device 11 is connected to the device 21 and the central station and terminal station exchanges 12, 26 are connected respectively to the devices 21, 23. Then a forced simultaneous end of call tone is transmitted from each terminal station to all terminal lines during operating at present to urge the end of the call of the subscriber and then simultaneous talking is realized surely from the device 11.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a DAMA communication device using a satellite, and in particular, to a forced-simultaneous communication system in the communication device. Shown in Figure 1. In the figure, 11 is a disaster prevention communication ring - a simultaneous communication device that outputs a simultaneous signal E when simultaneous communication is necessary; 12
is a switch, 13 is a DAMA device that allocates lines, etc.
Reference numeral 14 denotes a CSC line (common signal line) device consisting of a device demodulator, etc., which is constituted by an F5J modulator, etc.

Next, the operation will be explained. When the need for simultaneous communication arises, a simultaneous signal E is output from the central station simultaneous communication device 11 to the DAMA device 13. The DAMA device 13 uses the CSC line of the satellite line to simultaneously notify each earth station (terminal station) of information and urges each line to become free. Then, after the lines at all terminal stations are set up, simultaneous communication is performed.

However, in such devices, only the exchange is concerned with whether a call is being made between certain terminals, for example by telephone or by facsimile, and cannot be identified by the terminal station. Therefore, when performing the above-mentioned forced broadcast communication by fax, there is a drawback that the destination exchange may not be able to reliably connect to the target line (fax connection), making it impossible to carry out broadcast communication.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it is possible to force all the terminal lines currently in use at each terminal station by force-simultaneous information from the central station.
To provide a DAMA communication device that can reliably realize a forced call by transmitting a call-all tone to prompt subscribers to end their calls, and then performing a call-all.

[Embodiment of the Invention j Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Second
In the figure, the same reference numerals as in FIG. 1 indicate the same or equivalent parts, 21 is the DAMA device of the central station, 22 is the common signal line (CS C) device of the central station, 23 is the DAMA device of the terminal station, and 24 is the DAMA device of the central station. This is a forced call termination tone generator installed in this terminal station, which is used to prompt all terminal lines currently in use to perform call termination processing when receiving a forced call signal from the central station. This is for forcing the end-of-call sound to be played. 25 is a common signal line (C3C) device of the terminal station, and 26 is a terminal exchange.

Next, the operation will be explained.

When the need for forced simultaneous communication arises, a forced simultaneous signal E is sent from the simultaneous communication device 11 installed in the central station to the DAMA device z.
1. The DAMA device w21 uses the common line 22 to notify each terminal station that it will now enter the forced-simultaneous state. Each terminal station transmits a forced-simultaneous end-call tone from the forced-simultaneous end-call tone generator 24 to all terminals currently in use based on the forced-simultaneous information sent through the common line 25, and the subscriber ends the call. wait. At this time, if a facsimile is used as a terminal, it is sufficient to send out a call-end tone all at once for a certain period of time, so that the fax machine detects an error for the above-mentioned certain period of time, and the call is automatically ended.

After a vacant line is secured at each terminal station in this way, simultaneous communication is performed.

In the device of this embodiment, each terminal station is provided with a forced call end tone generator 24, so that when a forced call end signal is received from the central station, it prompts all terminals currently in use to end the call. Therefore, even when the operator wants to forcefully use a terminal such as a fax machine where the operator does not monitor the call status, it can be used easily and reliably.

In the above embodiment, the forced-all state is communicated to each terminal via the DAMA device common line, and the forced-all end call tone generator provided at the terminal station is used to prompt all terminals to end the call. However, the forced end call tone may be sent directly to the line in use from the forced end call communication device of the central station.

〔Effect of the invention〕

As described above, according to the present invention, the central office can force
When there is simultaneous call information, each terminal station sends a forced simultaneous call to all terminal lines currently in use to prompt subscribers to end their calls, and then performs a simultaneous call. This has the effect of allowing simultaneous calls to be made easily and reliably to the terminals.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a configuration of a simultaneous communication device in a central office of a conventional DAMA device, and FIG. 2 is a diagram showing a configuration of a simultaneous communication device of a DAMA communication device according to an embodiment of the present invention. 11... - Simultaneous communication device, 14... Terminal device, 21.
... DAMA device of the central office, 22 ... common signal line,
23... DAMA device of the terminal station, 24... Forced call end tone generator, 25... Common signal line, 26... Terminal station exchange. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) DAMA consists of one central station and multiple terminal stations and performs simultaneous command communication as part of the multiple access function.
In the communication device, the central station has a simultaneous communication means for sending a forced simultaneous telephone signal via a common line, and each of the terminal stations A DAMA communication device characterized in that it has a forced all call termination tone generating means for transmitting a forced all call termination tone for prompting a caller to make a call.