KR100194420B1 - Pulsed Digital Trunk Control Method in Key Phone System - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

This is a technology to control the pulse signaling used in E1, the digital trunk used in the key exchange system.

I. The technical problem to be solved by the invention

In the key phone system, signals from digital trunks are transmitted and received in pulse form to form a call.

All. Summary of Solution of the Invention

When the procedure signal is received through the E1 line of the digital trunk, the ready signal is sent to the digital trunk of the power station in the form of a pulse, and the hookoff message is sent to the main device of the key phone system. Detect the extension number to send to the main device, and when the extension number is transmitted to the main device, when the response signal is received from the extension to send a response signal to the power station to establish a call by connecting the call path.

la. Important uses of the invention

It is applied to control signaling of digital trunk using pulse in key phone system.

Description

Pulsed Digital Trunk Control Method in Key Phone System

The present invention relates to a digital trunk control method of a keyphone switching system, and in particular, a pulse type digital system in a keyphone system that allows a call to be made by controlling a signaling of a pulse type used in E1, a digital trunk used in a keyphone switching system. It relates to a trunk control method.

In general, in a phone system, a phone trunk is connected through a trunk line to transmit and receive a conversation, and there is a digital trunk method. In the digital trunk, there are various methods depending on the types of signals to be sent and received. Among them, except for the pulse method, it is common to keep the state unless the signal is set once. In the pulse method, it is important to be aware of the pulse type information because the information can be exchanged in a pulse form, and if the state cannot be read in a timely manner, the signal value can be a problem.

Accordingly, an object of the present invention is to provide a pulse type digital trunk control method for forming a call using a pulse type as a signaling of a digital trunk in a key exchange system.

It is another object of the present invention to provide a pulsed digital trunk control method for forming a call by signaling in a pulsed manner when signaling information is exchanged between a simple exchange and a power in a pulse format according to the type of a large-scaled exchange system. .

1 is a block diagram of an E1 board according to an embodiment of the invention

2 is a flow chart for controlling information exchange in conjunction with a key phone system according to an embodiment of the present invention.

3 is a control flow diagram for exchanging information with a power system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an E1 board according to an embodiment of the present invention.

DKP-ENGINE 10 matches the channel data coming from the line with the channel of the specified highway, and the time switch function, the function with the main device, the main device, IPC (INTER PROCESS COMMUNICATION) function for communication, and interrupt logic function to support 7 interrupt sources. The E1 interface unit 12 is a hybrid IC developed for the E1 interface, and is capable of selectively HDB3 or AMI coding, has 32 USEC jitter buffers, and transmits / receives TX and RX frames and multiframes. MULTIFRAME) Generates a synchronization signal. EQUALIZER 14 performs pre-emphasis (PRE-EMPHASIS) in accordance with distances 0-15, 150-450, and 450-655 FOOT (22AUG). Analog DPLL 16 is a DUAL PHASE-LOCKED LOOP CHIP and consists of DPLL1 and DPLL2. DPLL1 receives 12.352MHz from the outside and divides 8 times internally to generate 1.544MHz. DPLL2 receives 16.384MHz externally and divides 8 minutes. It generates 2.048MHz and uses it for clock synchronization. EXTERNAL DIGITAL TRUNK 18 uses transmit / receive transformer and 2.048Kbps (30 channels) of data from trunk line is received as bipolar signal through receive transformer, and this bipolar signal is converted into unipolar signal inside to convert analog DPLL. 16 is inputted to extract the synchronization signal. LOCAL PROCESSOR 20 executes the program stored in ROM 22 and stores the data necessary to execute the program in RAM 24.

2 is a flowchart for controlling information exchange in association with a key phone system according to an embodiment of the present invention.

When the program starts, it initializes and sets the schedule in the scheduler. At this time, the alarm processing module processes the error alarm, and the IPX receiving message processing module processes the main device and the receiving message. And the line interface module interfaces the signals input and output through the line. The IPX send message processing module processes the host device and the send message.

3 is a control flowchart for exchanging information with a power system according to an embodiment of the present invention.

1 to 3, the operation of the preferred embodiment of the present invention will be described in detail.

The difference between the signal system and the existing system is that if the information transmitted and received in the existing system is 11, the information is maintained until 11 until the next information is detected. Since the information 11 is in the form of a pulse for a predetermined time, it is necessary to detect a signal expressing the pulse duration well. The pulse detection method checks the detection state at 50 ms. At first, it checks whether a pulse is unconditionally detected, and if it detects it, it recognizes the rising state and checks whether the pulse drops every 50 ms. When the pulse falls, the time from the rising state is calculated and IDLE pulse is less than 50ms / 1000ms or more, and if it is 350ms or less, a SEIZE / ANSWER pulse and 350ms or more are released pulses. see. Pulse sending is also operated every 50ms. When 50ms is reached, it checks the transmission pulse status to maintain the rising state for 150ms for the SEIZE / ANSWER signal and 600ms or more for the RELEASE signal. By sending a pulse of the time width that the other party can recognize. In the pulse method, it is important to be aware of the pulse type information because the information may be changed if the information is not read in a timely manner because the information is sent and received in the pulse type.

Referring to FIG. 3, when the CO line is received in step 101, the local processor 20 receives a pulse on the line of E1. The signal is checked by the SEIZE signal and the local processor 20 is checked in step 102. A ready signal is sent to the player in pulse form and a hook-off message is sent to the host device. Thereafter, in step 103, the local processor 20 receives the dial number, determines the extension to be called, and transmits the call data to the host device. In operation 104, the local processor 10 checks whether the corresponding station is hooked off and responds. In step 105, the local processor 20 pulses a transmission response signal to the power line. Thereafter, in step 106, the local processor 20 enters the call mode so that two subscribers can make a call. In this case, the local processor 20 checks whether the extension is hooked on at step 107, and if the hook is turned on, proceeds to step 108 to send and use a release guard signal as a pulse to indicate that the hook is turned on to the player. Clear all channels and return to normal. However, if the hook-up is made on the player side first, the release signal is sent. In step 109, the local processor 20 checks whether a release signal is received from the player side, and proceeds to step 110 when the release signal is received. In step 110, the local processor 20 transmits hook-on data to the main device and sends a normal signal to indicate that the line used as a power station is normal. And clear all used channels for future use.

Controls the signaling of the pulse method used in E1, the digital trunk used in the key exchange system, so that the call can be made by sending and receiving signaling information in the form of intermittent pulses rather than the continuity of signal bits. There is an effect that can make a call in response to.

Claims (4)

A digital trunk control method using pulsed signaling in a key phone system, Digital trunk control method in a key phone system, characterized in that the exchange of the signaling information of the digital trunk E1 with the power in the form of an intermittent pulse to form a call. A digital trunk control method using pulsed signaling in a key phone system, Sending a ready signal to the digital trunk of the power station when the procedure signal is received through the E1 line of the digital trunk and sending a hook-off message to the main device of the key phone system; Transmitting the hook-off message, receiving a dial number, detecting an extension number to be communicated with, and transmitting it to a host device; And transmitting a response signal to a large station when a response signal is received from the extension after the extension number is transmitted to the main device, thereby establishing a call by connecting a call path. The method of claim 2, And a step of sending a release guard signal as a pulse to a large station when the extension of the keyphone system is hooked up after performing the call. The method of claim 3, In the keyphone system, characterized in that further comprising the step of transmitting a normal signal for notifying that the hook-on data and the line used as a normal state to the main device when the release signal is received from the power station after performing the call Digital trunk control method.