JPH0946416A - Channel closing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the transmission of a data signal from being affected by transmission of information relating to channel closing and to allow even a time division multiplexer to ensure the channel closing. SOLUTION: In a network where stations each consisting of an electronic exchange containing plural channels and a time division multiplexer are connected via a private line, each time division multiplexer is provided with a closing switch 15A-i corresponding to each of channels stored by an electronic exchange of a station. When any closing switch is switched on or off, the time division multiplexer 14A inhibits or releases reception of a call with respect to a channel corresponding to the closing switch and informs the presence of the channel to be closed or whose closing is released to a time division multiplexer 14B of an opposite station through communication using an idle bit of a multiplex signal. The time division multiplexer of the opposite station receiving the notice inhibits or releases the reception of the call with respect to the informed channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel blocking method in a network in which two stations, which are an electronic exchange (for example, private branch exchange; PBX) and a time division multiplexer (TDM), are connected via a dedicated line.

[0002]

2. Description of the Related Art Conventionally, it has already been proposed to use a private branch exchange to construct a small-scale network or a local area network (LAN) as shown in FIG.
That is, two stations facing each other across the leased line 1 are respectively time division multiplexing devices 2A and 2B as line termination devices.
And private branch exchanges 3A and 3B connected to the time division multiplexers 2A and 2B, and a plurality of terminals 4A-1 to 4A-m and 4B-1 to 1B accommodated in the private branch exchanges 3A and 3B.
4B-n, the network is configured.
The terminals 4A-i and 4A-j (i and j are 1 to 1 respectively) housed in the same private branch exchange (referred to as 3A).
m), communication is performed via this private branch exchange 3A,
Terminals 4 accommodated in different private branch exchanges 3A and 3B
Between A-i and 4B-k (k is 1 to n), communication is performed via the private branch exchange 3A, the time division multiplexer 2A, the leased line 1, the time division multiplexer 2B, and the private branch exchange 3B.

In such a network, some channel lines (terminals) accommodated in the private branch exchanges 3A and 3B are often blocked from operation selection (hereinafter referred to as channel blockage) due to maintenance requests. May be Such channel blockage is caused by the terminal (4A
It is performed by turning on the blocking switch 5A-i corresponding to the terminal 4A-i in the private branch exchange 3A accommodating (-i).

In this case, the exchange 3A has its terminal 4A-
i is displayed to indicate that the terminal 4A-i is not in use and does not respond to a transmission request from the terminal 4A-i.
A transmission signaling signal indicating that the corresponding blocking switch 5A-i is turned on is given to the time division multiplexer 2A.

Here, the time division multiplexers 2A and 2B are
The data signal or signaling signal from the outgoing line of the exchange 3A is not fixedly allocated to the multiplexed signal frame in the leased line 1 in correspondence with the outgoing line, but the built-in line allocator does not transmit data signals or outgoing signals from the outgoing line of the exchange 3A. It is assumed that the signaling signal is dynamically allocated to the multiplexed signal frame in the leased line 1 in response to a calling signal, a disconnection signal, or the like.

The time division multiplexing apparatus 2A receives from the exchange 3A a transmission signaling signal indicating that the blocking switch 5A-i corresponding to the terminal 4A-i is turned on,
A transmission signaling signal is allocated to a predetermined position of the multiplexed signal frame, and the multiplexed signal in which the transmission signaling signal is inserted is sent to the time division multiplexer 2B of the opposite station via the dedicated line 1.

The time division multiplexer 2B separates a signaling signal indicating that the blocking switch 5A-i corresponding to the terminal 4A-i is turned on from the received multiplexed signal and gives it to the exchange 3B. Thus, the exchange 3B internally sets so as not to accept a transmission request or the like from the accommodated terminal 4B-j to the blocked terminal 4A-i.

[0008]

However, in the prior art, in order to transmit information of a blocked terminal (hereinafter referred to as a blocked channel) to the opposite station, the data must be transmitted in the multiplexed signal frame in the leased line 1. As with the signal, it is necessary to secure a predetermined position (for example, a predetermined envelope) for inserting the information, which is not used for the original transmission of the data signal and the bit position in the frame decreases, resulting in poor transmission efficiency. There was a problem. Also, since only the private branch exchange is set to block and the time division multiplexer does not block the channel, if the private branch exchange mistakenly passes a call from the blocked channel or to the blocked channel, the time division multiplexing is performed. There has also been a problem that the device allocates unnecessary lines.

Therefore, there is a demand for a channel blocking method that can transmit blocked channel information to an opposite station without deteriorating the original transmission efficiency of a data signal, and can ensure blocking at each station.

[0010]

In order to solve such a problem, in the channel blocking method of the present invention, two stations consisting of an electronic exchange accommodating a plurality of channel lines and a time division multiplexer are dedicated lines. In a network connected via, it is characterized as follows.

That is, each time division multiplexer is provided with a blocking switch corresponding to each channel line accommodated in the electronic exchange of the same station, and when any blocking switch is turned on or off, Inhibits or cancels call acceptance for the channel line corresponding to the blocking switch, and informs the time division multiplexer of the opposite station that there is a channel line to be blocked or unblocked by communication using the empty bit of the multiplexed signal. It is characterized in that the notification is made and the time division multiplexing device which has received the notification prohibits or cancels the call acceptance regarding the notified channel line.

Here, each of the time division multiplexers has a function that, when a built-in blocking switch is turned on or turned off,
Alternatively, when the time division multiplexing apparatus of the opposite station notifies that there is a channel line to be blocked or unblocked, it is preferable to activate the blocking or unblocking operation in the electronic exchange of the own station.

[0013]

According to the channel blocking method of the present invention, when any blocking switch is turned on or off, the call acceptance for the channel line corresponding to the blocking switch is prohibited or released, and the blocking or release is made. The time division multiplexing apparatus of the opposite station notifies the time division multiplexing apparatus of the opposite station that there is a channel line to be communicated by using the empty bit of the multiplexed signal,
The call acceptance for the notified channel line was prohibited or canceled.

As a result, the transmission of the data signal can be prevented from being affected by the transmission related to the channel block, and the block can be blocked even in the time division multiplexing device, so that the block can be secured.

Here, in each time division multiplexer, when the built-in blocking switch is turned on or off,
Or, when it is notified from the time division multiplexing device of the opposite station that there is a channel line to be blocked or unblocked, the electronic exchange of the own station is caused to activate the blocking or unblocking operation, It is not necessary to provide a blocking switch in the electronic exchange to instruct blocking or unblocking separately from the time division multiplexer, which is preferable.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a channel closing method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a network to which the channel blocking method of this embodiment is applied together with the flow of operations when a block command is issued. It is shown with reference numerals.

In FIG. 1, the network according to this embodiment is also made up of two stations that face each other across the leased line 1, and each station has a time division multiplexer 2A, 2B, a private branch exchange 3A, 3B, and a plurality of stations. Terminal (not shown in FIG. 1, but in the following description, reference numerals 4A-1 to 4A in FIG. 2).
-M, 4B-1 to 4B-n are used appropriately).

Each private branch exchange 3A, 3B in this embodiment is not provided with a blocking switch corresponding to the accommodated terminal. The present invention presupposes that even if provided, it is not used. Private branch exchange 3
When A and 3B receive a signaling signal including ON information of a certain blocking switch (described later) from the time division multiplexers 2A and 2B of the same station, the transmission request from the terminal corresponding to the blocking switch and its The internal state is set so that the transmission request to the terminal is not accepted, and at the end of the setting operation, a signaling signal indicating that is sent to the time division multiplexing apparatuses 2A and 2B of the same station. Further, when each private branch exchange 3A, 3B receives a signaling signal including OFF information of a certain blocking switch from the time division multiplexers 2A, 2B of the same station, a transmission request from a terminal corresponding to the blocking switch or At the same time as returning to the internal state (blocking release state) for accepting a transmission request to the terminal, at the end of the returning operation, a signaling signal indicating this is sent to the time division multiplexing apparatus 2 of the same station.
It is sent to A and 2B.

Each time division multiplexer 2A, 2B has a channel board 11A, 11B and a line interface board 12.
A and 12B, monitoring control units 13A and 13B, and line allocation units 14A and 14B.

Each of the channel boards 11A and 11B accommodates a plurality of data lines and signaling lines connected to the private branch exchanges 3A and 3B of the same station.
Under the control of the line allocators 14A and 14B, data signals and signaling signals of a plurality of channels from the private branch exchanges 3A and 3B are multiplexed by controlling the timing to be given to the line interface boards 12A and 12B. The private branch exchange 3 receives the multiplexed signals received by 12A and 12B under the control of the line allocating units 14A and 14B.
Demultiplexing is performed by taking in another route to A and 3B. Further, when a calling or disconnection signal is given, it is given to the line allocating units 14A and 14B.

Not only is the above-described structure having the same function as that of the conventional one built-in, but the respective channel boards 11A and 11B according to this embodiment are the terminals housed in the private branch exchanges 3A and 3B of the same station. (Channel) 4A-i, 4B-k
Block switches 15A-i and 15B-k corresponding to the above. When the block switches 15A-i and 15B-k are newly turned on or off, the channel boards 11A and 11B give a signaling signal indicating the fact to the private branch exchanges 3A and 3B of the same station. ,
When a channel block command or a channel block release command is given from the supervisory control units 13A and 13B, a signaling signal indicating that is given, and a signaling signal indicating that is sent to the private branch exchanges 3A and 3 of the same station.
It is given to B. When a signaling signal indicating that the private branch exchanges 3A, 3B of the same station have executed the blocking or unblocking operation is provided in response to this signaling signal, the signaling signal should be sent to the opposite station. It is designed to prevent

Each line interface board 12A, 12B
Serves to interface with the private line 1 and to perform multiple operations or multiplex separation operations in cooperation with the channel boards 11A and 11B. In the case of this embodiment, each line interface board 12A, 12B has a line allocator 1
4A and 14B, the communication information between CPUs (blocking channel information or blocking channel information) is transmitted by inserting an empty bit of the multiplexed signal, or the communication information between CPUs is extracted from the received multiplexed signal and the line is transmitted. Allocation section 14
It is given to A and 14B.

If the number of empty bits in the format of the multiplexed signal frame is less than the number of bits of the inter-CPU communication information (blocked channel information or blocked release channel information), a plurality of multiplexed signal frames are used to control the CP.
The U-to-U communication information (blocking channel information or blocking release channel information) will be transmitted.

The monitoring control units 13A and 13B monitor the states of the time division multiplexers 2A and 2B, etc., and also monitor the changes of the blocking switches 15A-i and 15B-k described above. is there. Closure switch 15A-i,
When it is detected that 15B-k is turned on, the channel allocation units 14A and 14B are provided with blocked channel information,
When it is detected that the blocking switches 15A-i and 15B-k are turned off, the blocking release channel information is given to the line allocating units 14A and 14B. In addition, the line allocation unit 14
When the blockage channel information or blockage release channel information is given from A and 14B, the channel board 11A,
A block channel command or block release channel command is given to 11B.

Basically, each line allocating unit 14A, 14B responds to the calling / disconnecting information of a channel given from the channel boards 11A, 11B in the multiplexed signal frame in the data signal of the channel. It assigns and cancels positions. In addition, each line allocation unit 14
When the block control channel information or the block release channel information is given from the monitoring control units 13A and 13B, the A and 14B transmit the block channel information or the blocked channel information to the opposite line allocating units 14B and 14A by the communication operation by the built-in CPU. The block release channel information is transmitted.
Further, when the blocked channel information or the blocked release channel information from the opposite line allocating units 14B and 14A is received, the information is given to the monitoring control units 13A and 13B. Furthermore, each line allocation unit 14A, 14
B is for prohibiting acceptance of a call to the blocked channel.

FIG. 3 shows a terminal (channel) 14A-
It is a flow chart which shows the procedure in the case of closing i.

The operator turns on the closing switch 15A-i on the channel board 11A corresponding to the terminal (channel) 14A-i to be closed (procedure T1).

At this time, the closed channel is notified to the private branch exchange 3A by a signaling signal, the private branch exchange 3A performs the closed operation for the channel, and at the same time returns a confirmation notice of the completion of the operation to the channel board 11A by the signaling signal. (Procedure T2-
1). When the monitoring control unit 13A detects that the blocking switch 15A-i is turned on, it notifies the line allocation unit 14A (procedure T2-2).

The line allocating unit 14A sets a state in which the call acceptance of the channel for which the blocking request is notified is prohibited (step T3). In addition, the line allocating unit 14A uses the empty bit of the multiplexed signal to indicate that there is a block requesting channel.
Notification is made to the opposing line allocating unit 14B through the U communication (procedure T4).

The line allocating unit 14B which has received the notification is
The call acceptance of the channel for which the notified blocking request is issued is prohibited (step T5). In addition, the line allocation unit 14
B notifies the monitoring control unit 13B of the channel related to the blocking request (procedure T6).

The monitoring controller 13B is a channel board 11B.
The private branch exchange 3B is notified of the closed channel by a signaling signal from the private branch exchange 3B, the private branch exchange 3B is caused to execute the closed operation for the channel, and a notification of the completion of the operation is returned to the channel board 11B by a signaling signal (procedure). T7).

Through the above-described series of procedures, in both stations, the terminal (channel) 4A-i corresponding to the closed switch 15A-i which is turned on is brought into the closed state in which the operation selection is not executed.

Although not shown, the procedure for releasing the blockage is almost the same. That is, when the block switch 15A-i on the channel panel 1A corresponding to the terminal (channel) 14A-i to be released from blockade is turned off, the private branch exchange 3A is notified by a signaling signal and the private branch exchange 3A detects the corresponding channel. While the blocking release operation is executed, the monitor control unit 13A detects the OFF change of the blocking switch 15A-i and notifies the line allocating unit 14A. At this time, the line allocating unit 14A restores the call acceptance of the channel for which the blockage cancellation request has been notified, and confirms that there is a channel for the blockage cancellation request by inter-CPU communication using the empty bit of the multiplexed signal. Notify the opposite line allocator 14B. The line allocating unit 14B that has received the notification restores the call acceptance of the channel for which the blocking cancellation request is notified, and also the monitoring control unit 13B.
To the block release request channel. The supervisory control unit 13B causes the private branch exchange 3B to notify the block release channel by a signaling signal from the channel board 11B, and the private branch exchange 3B performs the block release operation for the channel.

Therefore, according to the above embodiment, the blocking switch is provided in the time division multiplexer, and the blocking channel information or the blocking release channel information due to the ON / OFF change of the blocking switch is used as the empty bit of the multiplexed signal frame. Since it is configured to be transmitted to the opposite station through the inter-CPU communication using the, the blocked channel information or the blocked channel information can be transmitted to the opposite station without reducing the communication efficiency of the data signal or the like.

Further, according to the above-described embodiment, the blocking switch is provided in the time division multiplexer, and blocking channel information or blocking release channel information due to ON / OFF change of this blocking switch is given to the exchange to block or release the blocking. At the same time, the time-division multiplexer controls the transition to a state in which the call origination of the channel is not accepted, and the release of the channel is controlled. Can be made. By the way,
Conventionally, even if the exchange is blocked, if a call to the blocked channel is erroneously given to the time division multiplexer, the dedicated line is allocated. However, according to this embodiment, this can be prevented. .

The terminal (channel line) accommodated in the exchange may be not only a telephone terminal but also a facsimile terminal or a data terminal. Further, not a terminal but a transmission apparatus such as a multiplexer or a concentrator. It may be.

[0038]

As described above, according to the channel blocking method of the present invention, each station including the electronic exchange accommodating a plurality of channel lines and the time division multiplexer is connected through the dedicated line. In the network, each time division multiplexer is provided with a blocking switch corresponding to each channel line accommodated in the electronic exchange of the same station, and when any blocking switch is turned on or off,
Time-division multiplexer of the opposite station by prohibiting or canceling call acceptance for the channel line corresponding to the blocking switch and communicating by using an empty bit of the multiplexed signal that there is a channel line to be blocked or unblocked. Since the time division multiplexing device of the opposite station that has received the notification prohibits or cancels the call acceptance for the notified channel line, the transmission of the data signal affects the transmission related to the channel blockage. It is possible to prevent the reception and to block the time-division multiplexing device as well, thereby ensuring the blockage.

[Brief description of drawings]

FIG. 1 is a block diagram showing a network configuration according to an embodiment.

FIG. 2 is a block diagram for explaining a conventional channel blocking method.

FIG. 3 is a flowchart showing a channel blocking procedure according to an embodiment.

[Explanation of symbols]

1 ... leased line, 2A, 2B ... time division multiplexer (TD)
M), 3A, 3B ... Private branch exchange (PBX), 4A-1 ...
4A-m, 4B-1 to 4B-n ... Terminal (channel),
11A, 11B ... Channel board, 12A, 12B ... Line interface board, 13A, 13B ... Monitoring control section, 14
A, 14B ... Line allocation unit, 15A-i ... Blocking switch.

Claims (2)

[Claims] 1. In a network in which two stations, which are an electronic exchange that accommodates a plurality of channel lines and a time division multiplexer, are connected via a dedicated line, each time division multiplexer has: Provide a plurality of block switches corresponding to each channel line accommodated in the electronic exchange of the same station, and when any block switch is turned on or off, a call is issued for the channel line corresponding to the block switch. In addition to prohibiting or canceling the acceptance, the time division multiplexer of the opposite station is notified by communication using the empty bit of the multiplexed signal that there is a channel line to be blocked or unblocked. A channel blocking method, characterized in that a time division multiplexing apparatus prohibits or cancels call acceptance for a notified channel line. 2. Each of the time-division multiplexers has a channel line to be blocked or unblocked from the time-division multiplexer of the opposite station when the built-in block switch is turned on or off. 2. The channel blocking method according to claim 1, further comprising activating the blocking or unblocking operation of the electronic exchange of its own station when notified of the presence.