JPH0131337B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention, in an individual signaling system that transmits signals such as dialing information and call information on the same transmission path, digitizes dialing information and transmits it in a frame structure, thereby reducing line connection time. This relates to a line connection method that aims to shorten the time.

The signaling system for controlling exchange connections is the separate common line signaling system, in which signals such as dialing information for each line and call signals are transmitted on separate lines, and the line for transmitting signals such as dialing information is shared. There is an individual signaling system in which signals such as dialing information and call signals are transmitted over the same line.In the latter individual signaling system, the dialing information from is received and stored at the station that accommodates the caller. Then, it analyzes the dialing information to identify whether the called party is within the own station or in another station, and if the called party is within the own station, the called party is called, and if the called party is accommodated in another station, the called party is called. The system converts the dial information into, for example, a multi-frequency signal and sends it out, and the station that receives this dial information also identifies whether the called party is within its own station or accommodated in another station, and then sends the dial information to a multi-frequency signal. If the dialing information was found, the dialing information would be sent again. Therefore, since it is determined whether or not to establish a line connection between stations after all digits of dial information is received and stored, there is a drawback that the line connection time increases as the number of relay stations increases.

The present invention, in a system in which a plurality of slave stations are connected via a digital line through at least a main station, transmits the called party's station number in a digitized form, and digitizes the called party's number through the line connection between the stations. The purpose of this is to reduce the line connection time by transmitting the information to the station. Examples will be described in detail below.

FIG. 1 is a block diagram of a system according to an embodiment of the present invention, in which a main station MS has a plurality of slave stations CX1 to CX4.
are connected via digital lines, and each slave station is connected to a telephone and data terminal. In some cases, a telephone may be connected from a subsidiary station via a private branch exchange.
FIG. 1 shows a case where a private branch exchange PBX is connected to the slave station CX4. It is also possible to connect another master station (not shown) to the master station MS. Calls between telephones SUB within one's own station are made by calling an extension number, and are communicated with other slave stations or private branch exchange PBX.
Calls to telephones housed in
For example, (0+XY+××××) (external line identification number +
(Slave station number + extension number).

Figure 2 is a block diagram of the main parts of the slave station, where 1 is a telephone, 2 is a subscriber signal detection circuit, 3 is a dialed number decoding circuit, 4 is a scan circuit, 5 is a dialed number storage circuit, and 6 is a frame generation circuit. circuit, 7 is a connection circuit, 8 is an AD conversion circuit, 9 is a DA conversion circuit, 1
0 is a subscriber signal generation circuit, 11 is a channel selection circuit, 12 is a frame decoding circuit, and 13 is a frame receiving circuit.

For example, to explain the case where a call is made from telephone SUBa housed in slave station CX1 to telephone SUBb housed in private branch exchange PBX, telephone SUBa
The dial signal from 1 is sampled and detected in the subscriber signal detection circuit 2, and a digit counter in the subscriber signal detection circuit 2 is counted up when one digit is received. The dial number and digit information received by the subscriber signal detection circuit 2 are transferred to the dial number decoding circuit 3, and the dial number decoding circuit 3 transmits the first digit dial number to the dial number decoding circuit 3. The dial number decoding circuit 3 compares it with the stored outside line identification number, and if it matches, the dial number decoding circuit 3
The dial number storage circuit 5 is notified of the number of digits of the slave station number stored in the dial number storage circuit 5.
stores the dial number from the second digit transferred from the subscriber signal detection circuit 2 via the dial number decoding circuit 3 by the number of digits indicated by the digit number information, for example, two digits of X and Y.

When the slave station number is stored in the dial number storage circuit 5, it instructs the frame generation circuit 6 to generate signaling information, activates the scan circuit 4, selects and connects an empty line with the connection circuit 7, and generates a frame. The frame generated by the circuit 6 sends out the slave station number and effective dial digit number information.

FIG. 3 is an explanatory diagram of the frame structure, where F is a frame synchronization signal, ID is identification information indicating whether it is signaling information or data information, SC is identification information of signaling information such as hook information, dial information, audible sound signal, etc. DC is valid dial digit information, DN ₁ ,
For DN ₂ , the upper 4 pits indicate dial digit number information, the lower 4 pits indicate dial number information, and DATA indicates data information such as digital audio signals. For example, if the slave station number is 14, it is 2 digits, so DC = 2. ,1
Since the digit is 1, DN ₁ =11, and since the second digit is 4, DN ₂ =24 (numbers are in hexadecimal), and the signaling information frame shown in a is constructed.

When the master station MS receives the slave station number, it selects an available line to the other slave station and connects to it. During this time, the extension number of the partner station is stored in the dial number storage circuit 5. At the originating slave station CX1, after the time required for line connection from the master station MS to the slave station CX4 has elapsed,
Alternatively, upon receiving a notification from the slave station CX4 that line connection has been completed, the extension number and valid dial digit number information are sent using the frame structure shown in FIG. 3a.

In the slave station CX4, when the frame receiving circuit 13 synchronizes the frame and receives the signaling information, it is transferred to the frame decoding circuit 12.The frame decoding circuit 12 decodes and understands the effective dial digit information DC and extension number, and selects a channel. The circuit 11 is notified of the line connection instruction, and the subscriber signal generating circuit 10 reproduces the dial number and sends it to the private branch exchange PBX. The private branch exchange PBX sends a calling signal to the telephone SUBb corresponding to the received dialed number, and when it goes off-hook in response to this call, the private branch exchange PBX notifies the slave station CX4 of the off-hook information, and the slave station CX4 receives the subscriber signal. When the off-hook information is detected in the detection circuit 2, the frame generation circuit 6 is activated and the off-hook information is sent to the slave station CX1 via the master station MS in the form of a signaling information frame.

In the slave station CX1, the off-hook information is received by the frame receiving circuit 13, decoded by the frame decoding circuit 12, and AD is sent from the channel selection circuit 11.
The conversion circuit 8 and the DA conversion circuit 9 are activated, and the audio signal is reproduced by sending the audio signal by AD conversion and by DA converting the received digital signal.
The AD-converted audio signal is sent out with the frame structure shown in FIG. 3b.

In addition, in the case of telephone 1 that is directly accommodated in the slave station,
A calling signal is sent out from the subscriber signal generating circuit 10. When on-hook occurs due to the end of a call, it is detected by the subscriber signal detection circuit 2, on-hook information is sent from the frame generation circuit 6 as a signaling information frame, this on-hook information is received by the frame receiving circuit 13, and decoded by the frame decoding circuit 12. , channel selection circuit 1
1 disconnects the line in progress.

As mentioned above, the originating slave station receives and stores the dial number for the number of digits required for line connection, and immediately sends out the other party's slave station number in a signaling information frame, and the main MS receives the dial number from the other slave station. When a line is formed with the originating slave station, the extension number of the receiving slave station is sent in a signaling information frame, and the slave station that receives this extension performs normal calling operations. Since it is not necessary to receive and store all digit dial numbers in the slave station and the main station MS, line connection time can be shortened. Also, when connecting a line from the master station MS to a slave station via another master station, connect the line in the same manner as described above by transferring the slave station number received by the master station MS to the other master station. be able to.

As explained above, in the individual signaling system, the present invention provides each slave station with a decoding means such as a dial number decoding circuit 3, a storage means such as a dial number storage circuit 5, and a signaling system such as a frame generation circuit 6. and frame generation means for generating an information frame, and when the decoding means identifies an outside line call, the frame generation means includes the destination slave station number and effective dial digit number information in the signaling information frame, and the main station MS When the main station MS connects the line to the other party's slave station, the other party's extension number stored in the storage means during that time is sent as a signaling information frame with dial digit number information added. In the station MS, after connecting the line according to the partner's slave station number, there is no need to receive and store the partner's extension number, and therefore, compared to the conventional example where line connection is controlled by receiving and storing all digits. line connection time can be shortened. Furthermore, by adding and transmitting valid dial digit number information and dial digit number information, it is possible to reduce errors on the receiving side of dial numbers.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG.
The figure is a block diagram of the main parts of a slave station according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of the frame structure. MS is the main station, CX1 to CX4 are slave stations, PBX is a private branch exchange, 1 is a telephone, 2 is a subscriber signal detection circuit,
3 is a dial number decoding circuit, 4 is a scan circuit,
5 is a dial number storage circuit, 6 is a frame generation circuit, 7 is a connection circuit, 8 is an AD conversion circuit, 9 is a DA
conversion circuit, 10 is a subscriber signal generation circuit, 11 is a channel selection circuit, 12 is a frame decoding circuit, 13
is a frame receiving circuit.

Claims (1)

[Claims] 1. In a line connection system in which multiple slave stations are connected via a main station and call information is digitized and transmitted using a frame structure, each slave station is equipped with means for decoding dialed numbers, means for storing dialed numbers, and A frame generating means for forming a signaling information frame is provided, and by identifying an outside line call by the decoding means, the destination slave station number and dial digit number information are sent to the main station as a signaling information frame by the frame generating means. After sending and forming a line to the other slave station via the main station,
A line connection system characterized in that the frame generation means forms a signaling information frame by the frame generation means and sends the destination extension number and dial digit number information stored in the storage means directly to the other party's slave station via the line.