JPH03192994A - Digital key telephone system - Google Patents

Abstract

PURPOSE:To effectively use a line according to the variation of traffic by using an ISDN network, and making it possible to set plural pieces of communication and calls between the same numbers on a single channel according to demand. CONSTITUTION:A key telephone A main device 1 is connected to a remote party side key telephone B main device 12 provided with the same configuration through the ISDN network 11. For instance, the main device 1 is provided with a number recognizing device 10 which confirms that compressive multiplex communication is possible after confirming the numbers of a calling origin and a call terminating destination, a multiplex control device 9 to execute actually compression and multiplexing, and an ISDN interface 7 for connecting it to the ISDN network 11. Then, when it is necessary to execute the communication and the call with the same remote party at a time by using plural channels, the line is used by multiplexing it. Thus, the using efficiency of the line is improved, and its effective use can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital button telephone device, and more particularly to a digital button telephone device that divides and multiplexes limited line capacity so that it can be used on a plurality of channels.

BACKGROUND OF THE INVENTION FIG. 2 is a schematic block diagram showing the configuration of multiplex communication using a conventional digital button telephone device of this type.

In the conventional configuration shown in FIG. 2, 21 is a key telephone A main device. Reference numeral 22 indicates a call control device that controls the entire A main device 21, and 23 indicates a time division switch, which is internally controlled by a PCM highway 24 and a system control bus 25, and is connected to a system control bus through a terminal interface 26. 25 is connected to a terminal such as a telephone 28, and the PCM highway 24 is connected to a multiplexing device 29 through a multiplexing device interface 27, and the signals multiplexed by this multiplexing device 29 are transmitted through a digital dedicated line. 31, the telephone is again connected via the multiplexing device 29 of the other party to the key telephone B main device 30 of the other party having the same configuration.

Further, FIG. 3 shows multiplex communication means between the A and B multigeneration devices 21 and 30.

Here, the PCM highways 40, 42 on the A and B multigeneration devices 21, 30 sides each have one time slot 43 of 64 kbps, and the PCM highways 40, 42 on the A main device side Multiple time slots are one 64 kbp at the multiplexer output 41
The signal is compressed and multiplexed onto the output channel 44 of the B main device, and is restored again by the PCM highway 42 on the B main device side.

That is, even in the conventional configuration, by dividing and multiplexing the limited line capacity of 5, it is possible to use multiple channels.

Problems to be Solved by the Invention However, in the multiplexing system of the conventional digital button telephone device configured as described above, the connection between the systems is 1:1, and moreover, it is through a dedicated line. Even when mutual traffic drops, it cannot be diverted to other uses, and conversely, when traffic increases and all lines are blocked, capacity cannot be easily increased. there were.

The present invention solves these conventional problems, and aims to provide a digital button telephone device of this type that can effectively use lines according to changes in traffic. It is something.

Means for Solving the Problems In order to achieve the above object, the present invention provides a key telephone main device that is capable of compressed multiplex communication after confirming the numbers of the calling party and the called party. a number recognition device that performs the confirmation; a multiplexing control device that actually performs compression multiplexing;
An ISDN interface is provided for connecting this to an ISDN network.

Effects Therefore, according to the present invention, the following effects can be achieved by constructing as described above.

In other words, by performing compression multiplexing while recognizing that each system has the above configuration, when a new communication request occurs between the same systems, the same in-use line can be used simultaneously in multiplex mode, reducing traffic congestion. If this happens, start up another line and perform the same control, or if the other party does not support multiplexing, leave it as is and use ISD.
9 communications can be made through the N network, and in this way, the line can be used effectively without using a special dedicated line or multiplexing device.

Embodiment FIG. 1 shows an outline of a digital button telephone device to which an embodiment of the present invention is applied.

In the configuration of the embodiment shown in FIG. 1, reference numeral 1 denotes a key telephone A main device. 2 is a call control device that controls the entire main device A, 3 is a time division switch, and 4 is a PCM highway that connects ISDN through an ISDN interface 7.
! 1fill, and 5 is a system control bus, which is connected to a terminal such as a telephone 8 through a terminal interface 6. Numeral 9 is a multiplexing control device that actually performs compression multiplexing, and 10 is a number recognition device that confirms that compression multiplex communication is possible after confirming the calling and destination numbers. This button telephone A main device l is
It is connected through the ISDN network 11 to the other party's key telephone B main unit 12 having the same configuration.

Therefore, in the configuration of the above embodiment, when a call is made from the A main device 1 side to the other party's B main device 12 side via the ISDN network 11, the A main device 1 uses the number recognition device 1O to
After confirming that multiplex communication with the main device 12 is possible,
Activate the multiplex control device 9, and the B main device 1 on the other side
Even in case 2, compressed multiplex communication is performed after performing the same processing. In addition, when a new call request is made to the other party from the A main device 1 side or the B main device 12 side, the number recognition device 10 similarly confirms that it is the same party and that it is multiplexed. After confirming that communication is possible, the multiplex control device 9 allocates a part of the lines in use for multiplexing, so that the same lines in use can be multiplexed and used at the same time. If the other party is not the same, the compression multiplexing process is not performed and the normal call is made, unless the call is made using the side line and it is confirmed that multiplexing is possible on the other party's side. 64 kbps is fully used as an ISDN line.

In other words, as described above, when according to the above embodiment,
When it is necessary to make two calls at the same time using multiple channels with the same party, the line can be multiplexed and used effectively and effectively, and it is possible to use a network such as an ISDN network instead of a dedicated line. Since a public line is used, it has the advantage that it can be used as a normal line when the traffic to the same location is not high as mentioned above.

Effects of the Invention As is clear from the configuration of the above embodiments, the present invention has the following advantages:
When the traffic to the same destination increases, the same line is multiplexed and used, which improves the efficiency of line usage and makes it possible to use it effectively. (By using the ISDN network, compression multiplex communication can be applied to multiple systems, and furthermore, when multiplexing is not used, it can be used as a normal line.) It has a natural effect.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing the configuration of a digital button telephone system that can perform division multiplex communication by applying an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing the configuration of a conventional digital button telephone system. FIG. 3 is a schematic block diagram showing the configuration, and is an explanatory diagram showing multiplex communication means between the main devices of each of the above systems. 1.21...Key telephone A main device, 2.22...
・Call control device, 3.23...Time division switch, 4,
24...PCM highway, 5.25...system control bus, 6,26...terminal interface,
7...ISDN interface, 8.28...
Telephone (terminal), 9...Multiplex control device, 10...
...Number recognition device, 11...ISDN network, 12.3
0... Button telephone B main device, 27... Multiplexer interface, 29... Multiplexer, 31...
...Digital dedicated line, 40.42...PCM highway on A and B multiplexer side, 41...Output between multiplexers, 43...1 time slot (64kb)
ps), 44...Output channel between multiplexers (
64kbp

Claims (1)

[Claims] A key telephone main unit includes a number recognition device that checks at least the numbers of the calling party and called party to confirm whether compressed multiplex communication is possible; A multiplexing control device that divides one 64kbps channel into multiple channels and performs compression multiplexing, and an I/O device to connect this to the ISDN network.
A digital button telephone device that is equipped with an SDN interface and uses an ISDN network to enable multiple communications and calls between the same numbers to be set on a single channel as necessary.