JPH04144457A - System for restricting connection between public line and private line - Google Patents

Abstract

PURPOSE:To make it possible to back up only a data signal excluding a voice signal by a rpaid digital public line by always monitoring a current rapid digital private line, and at the time of generating a fault, forming false busy-back signal against a voice signal in transmitting and returning the false signal to an originating exchange. CONSTITUTION:When an alarm detection circuit 10 detects a fault, a switch 11 is driven and a voice and a data signal from an exchange 2a is instantaneously switched to the rapid digital public line 6. Simultaneously with the detection, the circuit 10 sends fault detection information to a time-division multiplexing device 3a. The device 3a receives the fault detection information, forms a false busy-back signal by an alarm signal forming circuit 12 and outputs the formed signal to a signaling information forming circuit 13. The circuit 13 transmits the false busy-back signal to the exchange 20, only a voice signal is set up to a busy state and the transmission of only a data signal is backed up. Consequently, a rapid digital private line can be backed up by the low cost rapid digital public line.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time division multiplexing device, and in particular, the present invention relates to a time division multiplexing device, and in particular, when a time division multiplex transmission line fails when a tandem connection of private lines is made, a high speed digital private line is replaced with a high speed digital public line. Concerning the public line-private line connection restriction method when backing up.

[Conventional technology]

Traditionally, a digital leased line is currently used as a part of a network that is tandemly connected via a leased line.

When time-division multiplexing transmission is performed using a high-speed digital public line for backup, switching to the standby high-speed digital public line for backup in the event of a failure of the working line creates a tandem connection between the public line and the leased line, and the voice signal Because it is subject to public-private connection restriction regulations, high-speed digital public lines could not be used as backup lines.

[Problem to be solved by the invention]

Backup of the conventional high-speed digital dedicated line mentioned above is not possible because if all voice and data lines are unconditionally switched to the protection line, the voice signal violates public line-dedicated line connection restriction regulations. I have not been able to use public lines. Therefore, it was necessary to prepare a separate high-speed digital dedicated line exclusively for backup.

The drawback was that the high-speed digital leased line, which had high usage charges, had to be reserved as a backup line that was not used very often.

The purpose of the present invention is to constantly monitor the current high-speed digital leased line, set the voice signal being transmitted to a busy state in the event of a failure, avoid public line - leased line connection restriction regulations, and remove the voice signal. The object of the present invention is to provide a public line-to-leased line connection restriction system that can back up only data signals using low-cost, high-speed digital public lines.

[Means to solve the problem]

The public line-private line connection restriction system of the present invention is designed to connect the high-speed digital dedicated line of the working line and the protection line in order to perform time-division multiplex transmission in a part of the network connected in tandem via the leased line. In a public line-leased line connection restriction type in a noni time division multiplexing device connected via a high-speed digital public line, the operating status of the working line is monitored to detect a fault in the working line, and the detected information is the working line is then switched from the working line to the protection line, and pseudo-busy information for setting the voice signal switched to the protection line in a busy state is sent to the exchange, thereby complying with public line leased line connection restriction regulations. is configured to avoid this.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Fig. 1 is a system configuration diagram showing one embodiment of the present invention;
The figure is a block diagram showing one embodiment of the present invention.

FIG. 1 shows terminal equipment], a, lb, lc, and exchange 2a.
, 2b, 2c, and a time division multiplexer 3a.

31], high-speed line switching devices 4a and 4b that detect a fault in the working line, switch to the protection line, and send fault detection information to the time division multiplexer, a high-speed digital dedicated line 5, and a high-speed digital public line (ISDN l). 500 lines) 6, a dedicated line 7, and fault detection information 8.

FIG. 2 shows a fault detection circuit 10 of a high-speed line switching device W4a that detects a fault in a high-speed digital private line, a switch 11 that switches from a working line to a protection line when a fault is detected, and a pseudo busy signal that receives fault detection information. The pseudo busy signal generating circuit 12 of the time division multiplexer Ml 3a that generates the pseudo busy signal and the signaling information generating circuit 13 that returns the pseudo busy signal to the exchange 2a that is the originator are configured.

Here, switching from a working line to a protection line in the event of a failure will be explained with reference to FIG.

The high-speed line switching device 4a constantly monitors the high-speed digital dedicated line 5, which is the active line, and detects an error 1\detection circuit 10.
detects a fault, switch 11 is activated and switches 2
Voice and data signals from a are instantly switched to the high-speed digital public line 6. The alarm detection circuit 10 sends failure detection information to the time division multiplexer 3a on the same label.

The time division multiplexer W3a receives this failure detection information, generates a pseudo busy signal in the alarm signal generation circuit 12, and outputs it to the signaling information generation circuit 13. The signaling information generation circuit 13 returns this pseudo busy signal to the exchange 20, sets only the voice signal to the busy state, and backs up the transmission of only the data signal. In addition, when the fault in the high-speed digital dedicated line is repaired, the protection line is automatically restored to the working line, making it possible to transmit voice signals. During this time, the voice signal is not transmitted, so another public line is used to communicate the voice signal.

In this way, it is possible to back up a high-speed digital private line by using a high-speed digital public line that only requires a fee depending on the frequency of use, avoiding public line-private line connection restriction regulations.

In the above explanation, the time division multiplexer ff3 in FIG.
A and one side of the high-speed line switching device 4a have been explained,
time division multiplexer 31 at the other end] and high-speed line switching device 41
] It goes without saying that the same operation occurs.

〔Effect of the invention〕

As explained above, the present invention constantly monitors the currently used high-speed digital dedicated line and responds to the sound wheel signal being transmitted in the event of a failure.
By generating a pseudo-busy signal and sending it back to the originating exchange, only voice signals can be set to a call-disabled state, and all data signals other than voice signals can be backed up using low-cost, high-speed digital public lines. effective.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing one embodiment of the present invention;
The figure is a block diagram showing one embodiment of the present invention. la, lb, 1c/one terminal device, 2a, 2b2c...
・Switching equipment, 3a, 3b...Time division multiplexing device, 4a,
4b... High-speed line switching device, 5... High-speed digital dedicated line, 6... High-speed digital public line, 7... Dedicated line, 8... Fault detection information, 10... Fault detection circuit,
11... Switch, 12... Pseudo busy signal generation circuit, 13... Signaling information generation circuit.

Claims (1)

[Claims] In order to perform time division multiplex transmission in a part of a network connected in tandem via a leased line, a time division multiplexing device connected via a high-speed digital leased line as a working line and a high-speed digital public line as a protection line. In the public line-dedicated line connection restriction system, the operating state of the working line is monitored to detect a fault in the working line, and upon receiving the detected information, the working line is switched to the protection line, and the protection line is switched to the protection line. 1. A public line-private line connection restriction system, characterized in that pseudo-busy information for setting the received voice signal to a busy state is sent to the exchange to avoid public line-private line connection restriction regulations.