KR0131978B1 - Method and apparatus for monitoring signalling link of the - Google Patents

Abstract

The present invention relates to an apparatus and method for monitoring a signal link of a common line signaling method suitable for monitoring a signal link state of a common line signaling method performed in a block performing a level 2 function among common signal lines. In the technique of the present invention, when the signal link is to be monitored, there is a drawback to use equipment such as MGTS, Chameleon 32, Turbo 7, etc., which are dedicated monitors according to the common line signaling method. Since each signal of the level 2 is directly applied to the monitor unit 800 without using a separate device, the desired monitor function can be easily performed by the algorithm shown in FIG.

Description

Apparatus and method for monitoring signal link of common line signaling method

1 is a block diagram showing the correlation of functional blocks of signal links that perform link level 2 functions of a conventional common line signaling method.

2 is a block diagram illustrating an embodiment of an apparatus for monitoring a signal link of a common line signaling scheme in accordance with the present invention.

3 is a flowchart showing step by step the algorithm of the monitor unit according to FIG.

* Explanation of symbols for main parts of the drawings

500: signal data link (level 1) 510: error detection limit determination and alignment unit

520: receiver 530: link state controller

540: transmitter 600: signal link (level 2)

700: signal network function (level 3) 800: monitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to common channel signaling (CCS) No. 7 of an all-electronic exchange (TDX-1A), and in particular, a common line signal performed in a block performing a level 2 function among common line signaling. The present invention relates to an apparatus and a method for monitoring a signal link of a common line signaling method suitable for monitoring a signaling link state of a scheme.

In general, in common line signaling (CCS No.7: hereinafter referred to as CCS No. 7 or No. 7) of an all-electronic exchange, No. 7 signaling is a common channel. Common channel signaling in the sense of exchanging a signal for a channel, it can be seen as a kind of data communication characterized for the transmission of various signals and information between the processors present in the communication network.

These signaling methods are optimized for operation in digital networks, satisfying the need for information transfer between processors for call control, remote control, management and maintenance signals in current and future networks, and without information duplication or loss. It provides a means to reliably deliver in order.

No.7 signaling is a call control signal for communication services such as telephone, Integrated Services Digital Network (ISDN), circuit switched data transmission, or special centers (for management and maintenance) within the communication network and various means of information transfer. Can be used.

This signaling method is largely divided into a network service part (NSP) and a user part (UP). The network service part includes a message transfer part (MTP) and a signal connection control part (Signalling Connection Part). SCCP), and the user part includes a telephone user part (TUP), an ISDN user part (ISDN), an answer service function (TC), and an application service element (ASE). Etc. are included.

They form a hierarchical structure of four functional levels, where the message delivery section is level 1, level 2 and level 3, and the other elements are level 4, which is the user of the message delivery section.

This hierarchical structure may be classified according to the Open System Interconnection (OSI) reference model, where the signaling connection control unit belongs to level 4 as a user of the message delivery unit, while the OSI model provides a layer 3 network service.

In this regard, FIG. 1 is a block diagram showing the inter-relationships of functional blocks of a signal link performing a signal link level 2 function of a conventional common line signaling method, and receives a signal unit from a signal data link (level 1) 100. Detects an error and outputs a normal signal unit, and receives another signal unit to perform a Signaling Unit Alignment function to determine and align an error detection limit to form a normal signal unit and transmit it to the signal data link 100. A reception unit 120 for receiving the normal signal unit of the error detection limit determination and alignment unit 110 and outputting the link state signal unit and the message signal unit, respectively, and the link state signal unit of the receiver 120; If the message received by the signal network function (level 3) 300 is an internal message, the corresponding common line promised by the system. The link state control unit 130 performing the protocol according to the call method, the link state signal unit of the link state control unit 130, and the message signal unit applied by the signal network function 300 are applied to make the signal unit and limit the error detection. It consists of a transmitter 140 for transmitting to the determination and alignment unit 110.

Here, the error detection limit determination and alignment unit 110, the receiver 120, the link state controller 130, and the transmitter 140 are included in the signal link (level 2) 200.

Referring to the related art, the error detection limit determination and alignment unit 110 of the signal link 200 receives a signal unit from the signal data link 100 to detect an error and outputs a normal signal unit. The signal unit is received from 140 to perform a signal unit alignment function to make a normal signal unit and transmit the normal signal unit to the signal data link 100.

That is, the error detection limit determination and alignment unit 110 has a function of transmitting the signal unit to the signal data link 100, that is, adding a flag at the beginning and the end of the signal unit and a portion other than the flag and the flag. In order to distinguish from and, five consecutive data # 1 'are added followed by data # 0' and transmitted to the signal data link 100.

In addition, it generates a Cyclic Redundancy Check (CRC) code in the signal unit for error detection, and has a function of receiving the signal unit through the signal network function 300. Eliminate 0 ms, detect the flag to determine the signal unit limit, and detect errors due to the circuit redundancy check code.

Next, the receiver 120 receives the normal signal unit of the error detection limit determination and alignment unit 110 to output the link state signal unit and the message signal unit, that is, the received signal unit according to a predetermined basic error correction scheme. When an error for the sequential number is detected and an error occurs, the other signaling link is requested to retransmit the message signal unit or the link state controller 130 is informed that the service is out of service.

In addition, the link state controller 130 receives the link state signal unit of the receiver 120 and receives a protocol according to the common line signaling method promised by the system when the message received by the signal network function 300 is an internal message. Perform.

That is, the link state controller 130 controls the overall state of the signal link, takes appropriate countermeasures through exchange with other blocks, and informs the other side of the signal link or signal network function 300 of the signal link state and the signal network. The signal link is controlled according to the command of the function 300.

Subsequently, the transmitting unit 140 receives the message signal unit applied from the signal network function 300 to make it a signal unit, and transmits the signal to the error detection limit determination and alignment unit 110, that is, the message transmitted from the signal network function 300. Receives a signal unit, controls transmission and controls transmission priority of the signal unit by a predetermined basic error correction scheme when transmitting the signal unit over a relative signal link.

In such a prior art, there is a case where a signal message based on a common line signaling method transmitted / received on a signal link occurs during an operation such as set-up of a signal link based on a common line signaling scheme.

However, in such a conventional technology, when the signal link is to be monitored, the equipment such as MGTS, Chameleon 32, Turbo 7, etc., which are dedicated signal link monitors according to the common line signaling method, should be used. There is this.

First, it is difficult to monitor multiple signal links at the same time.

Second, economic, time, and human costs are consumed due to equipment purchase and transportation.

Third, the users of the equipment need to be trained on the use of the equipment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned shortcomings, and the signal link of the common line signaling method enables the user to monitor the signal at the signal link corresponding to the level 2 directly without the specific monitoring equipment as in the prior art. It is an object of the present invention to provide an apparatus and a method for monitoring the same.

In order to achieve the above object, the present invention receives a signal unit from signal data link level 1, detects an error, outputs a normal signal unit, and receives another signal unit to perform a signaling unit alignment function. If the signal unit length error and the cyclic redundancy check error are detected in the received signal unit, it outputs a signal indicating the cause of the error and the number of occurrences of the error. A receiver for receiving the normal signal unit of the limit determination and alignment unit, an error detection limit determination and alignment unit, outputting a link status signal unit and a message signal unit, respectively, and outputting a signal indicating the buffer position and length of the message signal unit; Link status signal unit A link state control unit performing a protocol according to the common line signaling method promised by the system when the message received at the signaling network function level 3 is an internal message, and outputting a signal informing of a change in the signal link state; Buffer position and length of the signal unit to receive the link state signal unit of the link state control unit and the message signal unit applied from the signal network function to make the signal unit and to transmit the error detection limit determination and alignment unit to the signal data link level 1. A monitor for outputting a signal for transmitting a signal indicating a signal link status, an error detection limit determination and alignment unit, a receiver, a link state controller, and a transmitter, respectively, and for monitoring a signal link state and a currently transmitted / received signal message when a user wants a monitor function. For the purpose of wealth The.

Here, the error detection limit determination and alignment unit, the receiver, the link state controller, and the transmitter are included in the signal link level 2.

Hereinafter, described in detail by the accompanying drawings an embodiment of the present invention as follows.

Referring to FIG. 2, FIG. 2 is a block diagram showing an embodiment of an apparatus for monitoring a signal link of a common line signal method according to the present invention, in which a signal unit is received from a signal data link (level 1) 500. FIG. It detects an error and outputs a normal signal unit, and receives another signal unit to perform a Signaling Unit Alignment function to make it into a normal signal unit, transmit it to the signal data link 500, and receive a signal from the received signal unit. When a unit length error and a cyclic redundancy check error are detected, an error detection limit determination and alignment unit 510 outputs a signal indicating a cause of the error and the number of occurrences of the error, and an error detection limit determination and alignment unit 510. Receive the normal signal unit, output the link status signal unit and the message signal unit, respectively, In the case where the message received from the signal network function (level 3) 700 by receiving the link unit signal unit of the receiver unit 520 and the link state signal unit of the receiver unit 520 is outputted. The link state control unit 530 performs a protocol according to the corresponding common line signaling method, and outputs a signal informing when the signal link state is changed, and the link state signal unit and the signal network function of the link state control unit 530. The signal signal unit applied in 700 is applied to make a signal unit and transmit the signal to the error detection limit determination and alignment unit 510, and outputs a signal indicating the buffer position and length of the signal unit to be transmitted to the signal data link level 1. Signals from the transmitter 540, the error detection limit determination and alignment unit 510, the receiver 520, the link state controller 530, and the transmitter 540 are respectively applied. If desired the self-monitoring function comprises a signal link status and monitoring unit 800 for monitoring the current signal to be sent and received messages.

Here, the error detection limit determination and alignment unit 510, the receiver 520, the link state controller 530, and the transmitter 540 are included in the signal link (level 2) 600.

According to the present invention as described above with reference to FIG. 3, first, the error detection limit determination and alignment unit 510 of the signal link 600 receives a signal unit from the signal data link 500 to detect an error by detecting a normal signal. Outputs the unit, receives the signal unit from the transmitter 540, performs the signal unit alignment function, forms a normal signal unit, transmits the normal signal unit to the signal data link 500, and receives the signal unit length error from the received signal unit. And if a cyclic redundancy check error is detected, a signal indicating the cause of the error and the number of occurrences of the error is output to the monitor 800.

That is, the error detection limit determination and alignment unit 510 has a function of transmitting a signal unit to the signal data link 500, that is, adds a flag at the beginning and the end of the signal unit and distinguishes the flag from parts other than the flag. For this purpose, data 5 is added to the signal data link 500 after 5 consecutive data 1 'is added.

In addition, it generates a Cyclic Redundancy Check (CRC) code in the signal unit for error detection, and has a function of receiving the signal unit through the signal network function 700, i. Eliminate 0 ms, detect the flag to determine the signal unit limit, and detect errors due to the circuit redundancy check code.

Next, the receiver 520 receives the normal signal unit of the error detection limit determination and alignment unit 510 and outputs the link state signal unit and the message signal unit, that is, the received signal unit according to a predetermined basic error correction scheme. When an error occurs by detecting an error for the sequential number, requesting retransmission of the message signal unit to the counter signal link or notifying the link state control unit 530 that the service is out of service and informing the buffer position and length of the message signal unit The signal is output to the monitor 800.

The link state controller 530 receives the link state signal unit of the receiver 520 and receives a protocol according to the common line signaling method promised by the system when the message received by the signal network function 700 is an internal message. When the signal link state is changed, a signal informing of this is output to the monitor unit 800.

That is, the link state controller 530 controls the overall state of the signal link, takes appropriate countermeasures through exchange with other blocks, and informs the other signal link or signal network function 700 of the state of the signal link and the signal network. The signal link is controlled according to the command of the function 700.

Subsequently, the transmitter 540 receives the message signal unit applied from the signal network function 700 to make it a signal unit and transmits the error signal to the error detection limit determination and alignment unit 510, that is, the message transmitted from the signal network function 700. A signal unit buffer that receives a signal unit, controls transmission by controlling a basic error correction scheme, controls the transmission priority of the signal unit, and transmits the signal unit to the signal data link 500 when the signal unit is transmitted on the relative signal link. A signal informing the position and the length is output to the monitor unit 800.

Next, the monitor unit 800 receives signals from the error detection limit determination and alignment unit 510, the receiver 520, the link state controller 530, and the transmitter 540, respectively, and the signal link when the user desires a monitor function. Monitor status and signal messages currently being sent and received.

That is, the monitor 800 receives a signal indicating the cause of error occurrence and the number of occurrences reported by the error detection limit determination and alignment unit 510 to be output to the terminal, that is, displayed, and then transmitted by the transmitter 540. Information of the signal message to be sent to the signaling data link 500 to be informed is output on the terminal whenever another signal message is transmitted.

In addition, the monitor 800 outputs the information of the signal message received from the signal network function 700 informed by the receiver 520 onto the terminal whenever a message signal unit is received, and the link state controller 530 outputs the signal. When the link is notified, the signal link status is output on the terminal.

FIG. 3 is a flow chart showing the algorithm of the monitor unit 800 according to FIG. 2 step by step. First, it is determined whether to initialize the display state according to the monitor function and perform the monitor function (910 and 920).

Next, the current link state and time are measured when the monitor function is performed, and the initial screen is displayed accordingly (930).

Subsequently, when the information according to the detection of the received signal unit error is input, the error cause of the signal unit and the total number of error messages are displayed (940 and 950).

When the message information to be transmitted at level 1 is input, the transmission signal unit type is displayed (960 and 970).

Next, when message information sent to level 3 is input, the received signal unit type is displayed (980, 990).

Subsequently, when the signal link state is input, the current signal link state and duration are displayed (1000 and 1010).

That is, the monitor 800 receives the signals of the error detection limit determination and alignment unit 510, the receiver 520, the link state controller 530, and the transmitter 540, respectively, and displays the above processes in order to the terminal. This allows the user to monitor the signal link status and the currently transmitted and received signal messages if the user wants to monitor.

As described above, according to the present invention, each signal of the signal link level 2 of the common line signaling method is directly applied by the monitor unit 800 without using any additional equipment, thereby simplifying a desired monitor function by the algorithm shown in FIG. It can be done.

Claims (2)

In the signal link 600 formed between the signal data link 500 and the signal network function 700 for driving in accordance with the common line signaling scheme, the signal link 600 is the signal data link (level 1) 500 The signal unit is applied to detect an error and output a normal signal unit, and the other signal unit is applied to perform a signal unit alignment function to form a normal signal unit and transmit it to the signal data link 500 and receive the received signal. An error detection limit determination and alignment unit 510 for outputting a signal indicating a cause of the error and the number of occurrences of the error when a signal unit length error and a cyclic redundancy check error are detected in the unit; A receiving unit 520 for receiving a normal signal unit of the error detection limit determining and aligning unit 510 to output a link state signal unit and a message signal unit, and to output a signal indicating a buffer position and a length of the message signal unit; When the message received from the signal network function (level 3) 700 is received as an internal message by receiving the link state signal unit with the receiving unit 520, the system performs a protocol according to the corresponding common line signaling method promised by the system. A link state controller 530 which outputs a signal informing when the signal link state is changed; The link state signal unit of the link state control unit 530 and the message signal unit applied by the signal network function 700 are received and made into a signal unit and transmitted to the error detection limit determination and alignment unit 510. And a transmitter 540 for outputting a signal indicative of the buffer position and length of the signal unit to be transmitted to the data link level 1 500, wherein the error detection limit determination and alignment unit 510, the receiver 520, and the link state are included. When the user wants a monitor function by receiving signals from the control unit 530 and the transmitter 540, the common line signaling method further includes a monitor unit 800 that monitors signal link states and currently transmitted and received signal messages. Device that monitors the link. Initializing a display state and determining whether to perform a monitor function (910,920); Measuring (930) the current link state and time by performing the monitor function and displaying an initial screen accordingly; Displaying information (940, 950) on the cause of error of the signal unit and the total number of error messages when the information according to the received signal unit error detection is input; Displaying (960, 970) the transmission signal unit type according to the message information transmitted at the level 1; Displaying (980,990) the received signal unit type when message information sent to level 3 is input; And displaying (1000, 1010) the current signal link status and duration when the signal link status is input.