JPH0847020A - Distributed line concentrator having fault state notice function - Google Patents

Abstract

PURPOSE:To inform a fault state such as an entire fault of an electronic exchange of a master station to accommodated telephone terminals by providing a means informing the operating state of a stand-alone function to the telephone terminal. CONSTITUTION:When an electronic exchange 2 is in system-down or a fault takes place in a communication line 5, a line monitor section 16 of the distributed line concentrator 1 detects it to output the fault information to a line concentrator control section 15. The control section 15 selects a multiplex signal changeover switch 18 to connect a multiplexer/demultiplexer section 12 to the position of an exchange switch section 19 and transits to the stand-alone operation. In this case, a dial tone source 62 having a timbre different from the timbre of a dial tone of the electronic exchange 2 is connected to the exchange switch section 19 through a dial tone selection section 16. The speech between telephone terminals 3, 4 is made via the exchange switch section 19 and a dial tone sent from the sound source 62 is sent to a caller telephone terminal.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to distributed private branch exchange systems, and more particularly to distributed concentrators.

[0002]

2. Description of the Related Art Conventionally, when communication between a master station (exchange) and a concentrator (concentrator) becomes impossible, a call between subscribers accommodated in the concentrator (call within the own station). As a method to remedy the problem, by providing both the central station and the central station with the call connection setting function of the central station for the central station, a remote central station internal call connection system that enables local intra-station calls even when the central station side fails ( For example, Japanese Laid-Open Patent Publication No. 60-187197) or a remote switching system (for example, a remote switching system for connecting an emergency outgoing call from a subscriber accommodated in a remote concentrator to a specific subscriber accommodated in the concentrator). Published patent publication No. 3-2378
50) and other methods.

[0003]

Although these conventional methods have means for relieving a local call when the communication between the master station electronic switchboard and the distributed concentrator is disabled, such a method is not possible. There was no function to notify the subscribers housed in the distributed concentrator of the failure status on the side of the different electronic exchanges.

An object of the present invention is to notify a telephone terminal accommodated via the distributed concentrator of a failure condition such as a total failure of a communication path between the distributed concentrator and the master station electronic switch or the master station electronic switch. A distributed concentrator having a function is provided.

[0005]

DISCLOSURE OF THE INVENTION The distributed concentrator of the present invention has means for notifying a telephone terminal that the device is operating by a stand-alone function.

The device sends a dial tone having a tone color different from the tone color of the electronic exchange, and indicates that it is operating by the stand-alone function on the telephone terminal via the subscriber line.

[0007]

When the distributed concentrator operates in the stand-alone function, the dial tone sent to the telephone terminal has a different tone color from the dial tone sent from the electronic exchange.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a system including a distributed concentrator 1, a master station electronic exchange 2 and telephone terminals 3 and 4 of the present invention.

The telephone terminals 3 and 4 are subscriber lines 31 ... 3
4 representatively shows telephone terminals accommodated in the distributed concentrator 1, and these telephone terminals 3 ... 4 are connected via the distributed concentrator 1 and the communication line 5 connecting the distributed concentrator 1 and the electronic exchange 2. It is housed in the electronic exchange 2.

The distributed line concentrator 1 has subscriber lines 31 ...
Line interface units 10 ... 11 to which 34 is connected
, A line interface control unit 14 for controlling the line interface units 10 ... 11, a voice signal and a control signal of a plurality of subscriber lines are multiplexed, and the multiplexed signal is separated into a voice signal and a control signal for each line. Multiplexing / separating unit 12
And the exchange switch unit 19 provided in the distributed concentrator 1.
And the multiple signal connection changeover switch 18 for changing over the connection of multiple signals to the electronic exchange 2 side or the exchange switch section 19 side.
Via the line transmitting / receiving unit 13, the line monitoring unit 16 for monitoring the normality of the communication line 5 via the line transmitting / receiving unit 13, the memory unit 17, the dial tone selecting unit 61, and the dial tone selecting unit 61. A dial tone sound source (DT2) 62 connected to the exchange switch unit 19 and a concentrator control unit 15 for controlling the operation of each unit in the distributed concentrator are included.

The electronic exchange 2 has a line transmitter / receiver 21 and
Exchange switch unit 22 and dial tone sound source (DT1)
24 and a control unit 2 that controls the operation of each unit in the electronic exchange 2.
3 is included.

Next, the operation of the system shown in FIG. 1 will be described.

Subscriber line interface units 10 and 11
Then, the voice signals input from the telephone terminals 3 and 4 are output to the multiplexer / demultiplexer 12, and the control signals are output to the line concentrator controller 15 via the line interface controller 14.
In the multiplexing / demultiplexing unit 12, the line interface units 10, 1
1. Multiple voice signals input from 1 and multiple control signals input from the concentrator control unit 15 are multiplexed, and from the line transmitting / receiving unit 13 to the communication line 5 via the multiple signal connection changeover switch 18 toward the electronic exchange 2. Output. On the other hand, the multiplexed signal of the voice signal and the control signal, which is input from the electronic exchange 2 through the communication line 5 and the line transmission / reception unit 13, is input to the multiplexing / demultiplexing unit 12 via the multiplex signal connection changeover switch 18 and is separated. Voice signals to the corresponding line interface units 10 and 11, and control signals to the concentrator control unit 15
Is transmitted from the line interface control unit 14 to the line interface units 10 and 11 via the.

As described above, when the electronic exchange 2 and the communication line 5 are normal, the concentrator control unit 15 in the distributed concentrator 1 outputs voice and control signals between the telephone terminals 3 and 4 and the electronic exchange 2. However, if the system of the electronic exchange 2 goes down or a failure occurs in the communication line 5 and communication between the distributed concentrator 1 and the electronic exchange 2 becomes impossible, line monitoring is performed. The section 16 detects this and outputs failure information to the concentrator control section 15. The concentrator control unit 15 that has received the fault information determines that the distributed concentrator 1
The control processing program therein is switched to a program for processing the exchange function between the accommodated telephone terminals 3 and 4 included in the memory unit 17, and the multiplex signal changeover switch 18 is changed over to replace the multiplex / separation unit 12 with the exchange switch unit It connects to the 19 side and shifts to stand-alone operation. At this time, the dial tone sound source (DT2) 62 is connected to the exchange switch unit 19 through the dial tone selection unit 61.

Therefore, a telephone call between the telephone terminals 3 ... 4 is carried out via the exchange switch section 19, and a dial tone generated from the dial tone sound source (TD2) 62 is sent to the calling telephone terminal. The tone color of the dial tone makes it possible to notify the failure status occurring on the electronic exchange side rather than on the distributed concentrator. Further, by controlling the display device on the telephone terminal by the control signal sent from the concentrator control unit 15 via the line interface unit, the telephone terminal on the receiving side can be informed of the above failure condition.

In the above embodiment, the TD2 is the only dial tone sound source that the distributed concentrator 1 has, but by using a plurality of such sound sources, more complex and detailed information can be transmitted by the tone color of the dial tone. Is also possible.

Further, the distributed concentrator is required to have a switching function, but if a device having a switching function is present, the terminal accommodated in the device can be identified not only by the fault condition but also by the tone color of the dial tone. You can send certain possible information.

[0019]

As described above, according to the present invention, the tone color of the dial tone of the distributed concentrator having the stand-alone function is set to be different from the tone color of the dial tone of the master station electronic exchange, so that the electronic tone is more electronic than the distributed line concentrator. This has the effect of notifying the terminals accommodated in the distributed concentrator of the situation such as an important failure on the exchange side.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a distributed concentrator of the present invention together with an electronic exchange and a telephone terminal.

[Explanation of symbols]

 1 distributed concentrator 2 electronic switch 3, 4 telephone terminal 5 communication line 10, 11 line interface unit 12 multiplex / separation unit 13, 21 line transceiver unit 14 line interface control unit 15 line concentrator control unit 16 line monitoring unit 17 memory unit 18 Multiple signal connection selector switch 19, 22 Exchange switch unit 23 Control unit 31, 41 Subscriber line 61 Dial tone selection unit 24, 62 Dial tone sound source

Claims (3)

[Claims] 1. A line extending from a plurality of telephone terminals is accommodated, a voice signal and a control signal transmitted / received to / from the telephone terminals are multiplexed and connected to a master station electronic exchange, and with the master station electronic exchange. In the case of a distributed concentrator having a function of switching to a stand-alone operation of performing a switching connection of calls originating and terminating between the telephone terminals without using the electronic exchange when communication is disabled, the operation is performed by the stand-alone function. A distributed concentrator having a notifying means for notifying the telephone terminal of the existence. 2. The distributed concentrator according to claim 1, wherein the notifying means sends a dial tone having a tone color different from that of the dial tone of the electronic exchange. 3. The distributed concentrator according to claim 1, wherein the notification means displays on the telephone terminal via the line that the stand-alone function is operating.