JPS63199562A - Communication terminal equipment - Google Patents

Abstract

PURPOSE:To improve the utilization efficiency of a line, and to lighten the operation of an operator by providing a detecting means which detects the state of the line, an instructing means which performs the instruction of a communication request, and a means which informs that the line can be used, when the line comes to the state that the use of it is permissible, on condition that the communication request has been instructed. CONSTITUTION:For instance, the line is assumed to be the ISDN line of 2B+D, i.e. one channel D and two channels B. When the channel B is being used, and a call can not be performed, a device, the B-CH vacancy informing function of which is registered by the operator, monitors the sequence of a channel D signal, and decides whether the channel B1 is vacant or not. At the point of time when the state that the channel B is vacant is confirmed, it rings a ringing and calls the calling side operator. Thus, in the case that all of the channel B are being used, the device monitors the state of the use of the channel B, and when the vacancy is present in the channel B, it informs it to the operator. Thus, the operation of the operator can be lightened, and the efficiency of the line can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a communication terminal device used in a communication system in which a plurality of communication devices utilize at least one line.

[Prior Art] Conventionally, as this type of communication system, for example, fsDN
(Integrated Ser-vicas
Digital Network) system is known. This l5DN line has 2 lines in one line.
It has three communication channels consisting of one data channel (B channel) and one control channel (D channel),
Up to eight terminals can be connected to this line. If the communication channel is free, communication can be performed in response to communication requests from each terminal.

[Problems to be solved by the invention] When multiple terminals use a small number of lines like this 15DN system,
Even if one terminal tries to communicate, it cannot communicate if the line is in use.

At this time, there was a problem in that it was difficult to know whether communication was possible unless a communication request was actually made each time.

[Means and effects for solving the problem] In the present invention, on the condition that a communication request is made, the notification means notifies that the line is available for use, so that the operator can easily respond to the communication request. You can know when the timing is possible.

[Example] An example of the present invention will be described in detail below with reference to the drawings. In this embodiment, a digital telephone connected to the 15DN system will be explained as an example.

1 to 4 are diagrams showing this embodiment, and FIG. 1 is a connection diagram in which the communication terminal device of this embodiment is connected to an ISDN network. 1 is a network termination device that is a network termination; 2 is a bus line that connects the network termination device 1 and a plurality of terminal devices; 3 is a subscriber line that connects the 15DN exchange and the network termination device 1; 4 ,8,10.11
5.9 is a digital facsimile device, 6 is a teletex device, and 7 is a digital telephone according to this embodiment. FIG. 2 is an external view of the digital telephone of this embodiment. In Figure 2, 21
22 is a handset, and 23 is a key button for inputting a telephone number and the like. FIG. 3 is a block diagram showing the configuration of this embodiment. In Figure 3,
31 is a digital telephone body, 32 is a central processing unit, 3
3 is an EPROM, 34 is a RAM, 35 is an I10 controller, 36 is a codec, 37 is a communication chip, 38 is a key button, 39 is a handset, and 40 is an I5DN line.

Next, the operation of the above embodiment will be explained.

FIG. 4 is a flowchart showing the operation of the above embodiment. In this example, D channel 1 tree and B channel 2
It is assumed that the tree is a 28+D l5DN line. First, if all B channels are in use and a call cannot be made in Fig. 451, S2
Then, the operator registers the B-CH availability notification from the terminal device. In the example, the B-CH availability notification function is registered using the special number '99'.
”. The device registered with the B-CH availability notification function by the operator monitors the D channel signal sequence in S3 to determine whether channel 81 is vacant. In S4, the device uses the same method to check whether channel 82 is in use. 85 when it is confirmed that the B channel is empty in S3 and S4 to determine whether it is empty.
A ringing sound is sounded to call the calling operator. Next, at 56, it is confirmed that the calling operator responds with an off-footer. If the operator's response is confirmed in S6, a dial tone is sounded in S7 to notify the operator that it is OK to make a call, and the operator performs the calling operation. Normal call operation then begins at 58.

In the above embodiment, when all B channels are in use, the operator is notified that the B channel is free, but when the B channel becomes free, the device automatically re-calls and when the other party's line is connected. A method of notifying the self-control (calling side) operator may also be used.

As explained above, when all B channels are in use, the device monitors the usage status of the B channels at the operator's request, and notifies the operator when the B channels become free. , it is possible to reduce operator operations and improve line efficiency.

[Effects] As described above, according to the present invention, lines can be used efficiently and the operator's operations can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram in which the communication terminal device of this embodiment is connected to the 15DN network, and FIG. 2 is an external view of the digital telephone of this embodiment. FIG. 3 is a block diagram showing the configuration of this embodiment, and FIG. 4 is a flowchart for explaining the operation of this embodiment. 1 is the digital telephone main body, 2 is the central processing unit, 3 is R
OM, 4 is a RAM, 5 is an input/output control device, 6 is a codec, 7 is a communication chip, 8 is a key button, 9 is a handset, and 10 is an 15DN bus line.

Claims (1)

[Scope of Claims] A communication terminal device used in a communication system in which at least one line is used by a plurality of communication terminal devices, comprising: a detection means for detecting the state of the line; an instruction means for instructing a communication request; A communication terminal device comprising means for notifying that the line is available when the line becomes available on the condition that the communication request instruction is issued.