JPH0530223A - Relay exchange - Google Patents

Abstract

PURPOSE:To provide the relay exchange in which sure talking is attained and the implementation of relay is confirmed by a caller terminal equipment. CONSTITUTION:The relay exchange consists of a dial information reception means receiving dial information via a digital line, a dial information call signal transmission means 106 detecting whether the next stage is a relay exchange or a terminal equipment based on the dial information received by the dial information reception means 105, sending the dial information when the next stage is the relay exchange and sending a call signal when the next stage is the terminal equipment and a noise return means 107 detecting a period when a dial information call signal is sent by the dial information call signal transmission means 106 and returning noise via a digital line for the transmission.

Description

Detailed Description of the Invention

[Object of the Invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater exchange connected to a digital line.

[0002]

2. Description of the Related Art In recent years, digital lines have come to be used for connection between transit exchanges for the purpose of improving call characteristics. Since the repeater exchange digitizes (encodes) the signal received from the analog line and sends it out to the digital line, in the normal state where there is no conversation, a code indicating silence is sent and finally analogized. As a result, it is possible to transmit a call voice with little noise regardless of the line distance and to make a call that is extremely easy to hear.

The relay exchange sends and receives dial information and sends out a ringing signal. When the dial information is received from a digital line, if the next stage is a repeater exchange, the dial information and the next stage are terminals. If it is a machine, the call signal is transmitted, and during the transmission, a code indicating silence is returned to the preceding repeater exchange through the digital line. For this reason, in the calling terminal, even after the dial input is made, relays are made one after another through the repeater exchange, and the line quality is deteriorated. There was a risk that the contents of the call would not be accurately transmitted.

[0004]

As described above, according to the conventional repeater exchange, when the dial information is received from the digital line, if the next stage is the repeater exchange, the dial signal is transmitted, and the next stage is the terminal device. If this is the case, the call signal is sent out, and during this sending, a code indicating silence is sent back to the preceding repeater exchange via the digital line. For this reason, the calling terminal cannot recognize the amount of relaying, and the call is made in a small voice, which may cause the content of the call to not be accurately transmitted.

The present invention has been made to solve the above problems of the conventional repeater exchange. The purpose of the present invention is to confirm that the call is being relayed at the calling terminal and to make an accurate call. It is to provide an exchange. [Constitution of Invention]

[0006]

According to the present invention, dial information receiving means for receiving dial information via a digital line and whether the next stage is a repeater exchange or a terminal based on the dial information received by the dial information receiving means. Detect and
Dial information / call signal sending means for sending dial information if it is a repeater exchange, and calling signal if it is a terminal device, and dial information / call signal is sent by this dial information / call signal sending means. The repeater exchange is configured by including a noise returning means for detecting the noise during the transmission and returning the noise through the digital line during the transmission.

[0007]

According to the above structure, when the repeater exchange is sending dial information to the next stage or is sending a ringing signal, noise is returned to the preceding stage repeater exchange through the digital line, Eventually, it will be transmitted to the terminal on the calling side, and the terminal on the calling side can confirm that the relay is being performed by listening to the noise given through the line when dialing from when dialing. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows a telephone switching network system to which the trunk exchange of the present invention is applied. In the figure, 10-1 to 10
-3 indicates a relay exchange. The repeater exchanges 10-1 to 10-3 are mutually connected by digital lines 1-1 to 1-3. Analog lines 2-1 to 2-10 extend from the repeater exchanges 10-1 to 10-3 and are connected to terminals such as subscriber exchanges 20-1 to 20-10. A subscriber terminal 30 such as a required telephone is connected to the subscriber exchange 20.

The repeater exchange 10 is, for example, as shown in FIG. 1, an interface 101 connected to digital lines 1-11 to 1-1n, 1-21 to 1-2n, and analog lines 2-11 to 2-1i. -11 ~
It is equipped with 101-1n, 101-21 to 101-2n, 102-1 to 102-i. Interfaces 101-11 to 101-1n and 101-21 to 101-2n select call control information and call information and control the call control information.
The call information is sent to the switch unit 104 side. The control unit 103 is provided with dial information receiving means 105, dial information / call signal transmitting means 106, and noise returning means 107. Dial information receiving means 105 receives dial information sent from the line. Dial information
The calling signal sending means 106 detects whether the next stage is a repeater exchange or a terminal based on the dial information received by the dial information receiving means 105, sends dial information if it is a repeater exchange, and sends a call signal if it is a terminal. Send out. Noise return means
107 indicates when the dial information / call signal sending means 106 is sending the dial information / call signal, and during this period, corresponds to the number of relay steps included in the dial signal to the preceding repeater exchange. The noise of the specified level is transmitted.
When the control unit 103 finishes sending the dial information or detects that the terminal responds by sending a calling signal, it controls the switch unit 104 to connect the line. Further, the interfaces 102-1 to 102-i include an A / D conversion unit and a D / A conversion unit, and detect the response and the call end by detecting the loop current.

FIG. 2 shows the detailed structure of the control unit 103. In the figure, transmitters 111 and 113 connected to digital line interfaces, receivers 112 and 114, and transmitter 11 connected to analog line interfaces.
5, the receiving unit 116 is shown, but a plurality of these units are actually provided. Main controller 12
0 includes a CPU 121, a noise generator 122, and a dial signal / call signal transmitter 123 including a dial signal transmitter and a call signal transmitter. Gain controllers 111A and 113A are provided on the output side of the transmission units 111 and 113. In such a configuration, the CPU 121 has the program of the flowchart shown in FIG. 3, stores the identification information of the destination line for each line, and performs the relay process using the line connection flag.

That is, the CPU 121 samples the reception units 112, 114 and 116 to detect whether or not the dial information is sent (401). Here, when dial information is sent, it is detected whether the received receiving line is analog or digital (402). If it is digital, it is detected whether the destination (destination) line is analog or digital (403), and if it is analog, the dial information / call signal sending unit 123 is controlled to send the call signal (404). ).
That is, if dial information arrives from the receiving unit 112 and the destination is an analog line of the transmitting unit 115, a call signal is sent to the transmitting unit 115. If it is detected in step 403 that it is digital, the dial information / calling signal sending unit 123
To send dial information (405). That is, the dial information comes from the receiving unit 112 and the destination is the transmitting unit 113.
If it is a digital line, the dial information is sent to the transmitting unit 113. Here, the CPU 121 adds "1" to the information on the number of steps of the relay included in the incoming dial information and sends it, and controls the gain controller 111A based on the information on the number of steps included in the incoming dial information so that the number of steps is reduced. The noise generation unit 122 is configured such that the higher the number, the higher the level.
Is driven to send noise to the sending unit 111 (406). And
This is done until the sending of the ringing signal / dial information is completed (407), and when it is finished, the noise is stopped (408), and when the dial information is sent or there is a response after the sending of the ringing signal, the switch unit The line is controlled by controlling 104, and when the calling side stops calling, the line is reset so that the line is abandoned (409) and the end is reached.

On the other hand, when the receiving line to which the dial information is sent is analog, it is detected whether the sending side line is analog or digital (410) If it is analog, the dial information / call signal sending unit 123 To send a call signal (411), and if the transmission line is digital, it controls the dial information / call signal sending unit 123 to send dial information (including the relay stage number "1") (412). ). Then, after steps 411 and 412, it is detected whether or not the transmission of the calling signal / dial information is completed (413), and when the transmission is completed, the routine proceeds to step 409.

Thus, in this embodiment, noise can be transmitted to the calling side terminal at the time of dial transmission corresponding to the relay stage, and it can be used as a measure for knowing the amount of relay and increasing the voice of the call. It is needless to say that the telephone call characteristic is extremely good because the telephone call is relayed by the digital code as in the conventional case during the telephone call.

[0014]

As described above, according to the present invention, when the dial information / calling signal is transmitted, noise is sent to the preceding repeater exchange through the digital line, so that it finally reaches the caller. , It is possible to confirm that the call is being relayed at the calling terminal, and an accurate call can be made.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a main part of an embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a block diagram of a telephone switching network system that employs a relay exchange.

[Explanation of symbols]

1-1 to 1-3, 1-11 to 1-1n, 1-21 to 1-2n Digital line 2-1 to 2-10, 2-11 to 2-1i Anaguro line 10-1 to 10-3 Relay Switch 101-11 to 101-1n, 101-21 to 101-2n, 102-1 to 102-1i Interface 103 Control unit 104 Switch unit 105 Dial information receiving means 106 Dial information / calling signal transmitting means 107 Noise returning means 111, 113,115 Transmitter 112,114,116 Receiver 111A, 113 Gain controller 120 Main controller 121 CPU 122 Noise generator 123 Dial information / call signal transmitter

Claims (2)

[Claims] 1. A dial information receiving means for receiving dial information via a digital line, and detecting whether the next stage is a relay exchange or a terminal based on the dial information received by the dial information receiving means, and is a relay exchange. The dial information / call signal sending means for sending dial information to the terminal, and the calling signal if the terminal is a terminal, and the period during which the dial information / call signal is sent by the dial information / call signal sending means. A repeater exchange, comprising: noise detecting means for detecting and returning noise through the digital line during the transmission. 2. The dial information / calling signal sending means sends information including the information indicating the number of stages of relay in the dial information, and the noise level returned from the noise returning means is said number of stages. 2. The repeater exchange according to claim 1, further comprising a noise level control unit that controls the information on the basis of the information indicating whether or not it is a relay.