KR0163144B1 - No.7 signal monitoring apparatus of digital exchanger - Google Patents

Abstract

The present invention relates to a signal monitoring device No. 7 of a digital electronic switching device, comprising: a signal terminal interface (44); A time switch interface unit 45; An E1 interface portion 46; When the operator selects a test position to test a signal link in a specific portion, an interface selection for enabling a corresponding output among the outputs of the ST interface unit 44, the TSW interface unit 45, and the E1 interface unit 46 is performed. Part 43; When the operator selects a channel to test a specific channel of a specific portion, according to the signal channel selection unit 42 for storing the timeslot information of the corresponding channel; A signal link monitor unit 47 which receives 64 Kbps channel data of the interface unit enabled by the interface selector 43 and analyzes a signal message to monitor a signal link state; A terminal interface unit 41 for interfacing the signal link monitor unit 47 with a terminal and transferring an interface selection signal and a channel selection signal; And a terminal 50 for allowing an operator to select a location and a channel to be tested and for displaying the results of the selected channel to the operator. Therefore, it can be tested online all the time, which facilitates the signal set-up and has the effect of easy maintenance.

Description

No.7 signal monitor device of digital electronic changer

(A) to (c) of FIG. 1 are data formats of No. 7 CCS.

2 is an example of a signal link path of a digital electron exchanger.

3 is another example of a signal link path of a digital electronic exchanger.

4 shows an example of an interface between a signal processing block and a time switch block.

5 is a block diagram showing a signal monitor device according to the present invention.

* Explanation of symbols for the main parts of the drawings

11-1 ~ 11-n, 21-1 ~ 21-n: Signal terminal (ST) 12: Speed converter (RA)

13: CIDB 14: SIDB

15: switch part (SWC) 16: collection part (DLC)

17,26: trunk part (TRK) 22: signaling terminal management part (STM)

23,25: Time switch (TSW) 24: Space switch (SSW)

31: Time Switch (TSL) 30: Signal Processing Unit (SS7U)

32: signal message processing processor (SHPA) 40: signal monitor device

41: terminal interface 42: channel selector

43: interface selector 44: signal terminal interface

45: time switch interface unit 46: E1 interface unit

47: signal link monitor unit 50: terminal

The present invention relates to an apparatus for monitoring the No.7 signal link when the No.7 common line signal (CCS) method is used in a digital electronic switching system.

In order to connect between terminals through a communication network, transmission and reception of signals (subscriber line signals) are required between the user terminal and the exchange. If the user terminals are accommodated in different exchanges, the exchange of signals between the exchanges (station signal) You need to do

At this time, the signaling method is divided into individual line signaling method (CAS) through which signals are transmitted through individual call lines, and common line signaling method (CCS) which transmits signals of multiple call lines as dedicated lines separated from the call lines. In addition, the common line signaling method has been widely used in the ISDN system since it has been made possible by the introduction of an electronic switching system employing an accumulation program.

No.7 common line signaling method is standardized by the ITU-T as the seventh signaling method. It is a data communication method that applies packet communication technology. The part corresponding to layer 1 to layer 3 of the OSI model is a message transmission unit ( MTP) is divided into Level 1: Signal Data Link, Level 2: Signal Link, and Level 3: Signal Network.

The packet format of the No.7 common line signaling system includes a fill-in signal unit (FISU), a link state unit (LSSU), and a message signal unit (MSU), as shown in Figs. .

In FIG. 1, the type of signal unit is determined by two bits in the error checking field of the length (LI) octet. For example, '00' means fill-in signal unit (FISU), and '01' means link. Status signal unit (LSSU), if '11' is message signal unit (MSU). In the formats of (a) to (c), 'F' represents a flag, 'BSN' represents a reverse sequence number, 'BIB' represents a reverse status indication bit, 'FSN' represents a forward sequence number, and 'FIB' represents a Forward status indicator bit, 'LI' indicates signal length indication and 'CK' indicates error check code.

The FISU is a signal unit that is transmitted when there is no other signal unit to be transmitted on the signal link, the LSSU indicates the signal link status of the sender of the signal unit, and the MSU is used to send and send a level 3 or higher signal message. This corresponds to the information (I) frame of the LAPD.

As shown in FIG. 2, the nailed-up path of the TDX-1 series for implementing the No.7 common line signaling method is a signal terminal (ST: 11-1 to 11-n) and a rate adapter (RA: 12). ), CDIB (13), SIDB (14), switch part (SWC: 15), collection part (DLC: 16), trunk (TRK: 17), and the TDX-10 series is shown in FIG. Similarly, a plurality of signal terminals (ST: 21-1 to 21-n) and signal terminal management (STM: 22) boards, time switches (TSW: 23), space switches (SSW: 24), for managing these terminals, It consists of a time switch (TSW) 25 and a relay line interface part (TRK: 26).

However, since there was no device for monitoring the No. 7 signal function provided by such a failed-up path, when the state of the No. 7 CCS signal link is to be monitored, Chameleon 32, Turbo 7, etc. The same dedicated equipment must be used. As such, when the dedicated equipment is used, the equipment is heavy and difficult to carry and expensive. In addition, the location to be monitored is limited and can only be tested at the signal link stage and at the PCM O / R stage.

That is, the No.7 signal function is implemented in the TDX series exchange, so the signal link setup and the No.7 signal interworking are essential for system setup or network interworking. The stability of the physical path must be ensured. At this time, when interlocking with the No.7 signal and failing to interlock, trace the No.7 signal message sent and received during interlocking to easily find the No.7 signal network error. There is no device to verify the stability of the failed-up path on-line. Therefore, it takes a long time when setting up the signal link, and there is a problem that it is not monitored for a long time when there is a change in the signal link even after the setup.

Accordingly, the present invention has been made in order to solve the above problems, the object of the present invention is to provide a No.7 signal monitor device that can monitor the No.7 common line signal signal signal link in the on-line state at all times. have.

In order to achieve the above object, the device of the present invention,

A signal terminal interface unit for receiving link data at the output terminal of the signal terminal ST and converting the link data into a 64 Kbps channel speed and outputting the link data;

A time switch interface unit for receiving the link data of the sub-highway, selecting a specific channel, converting to a 64Kbps channel speed and outputting the signal to monitor the No. 7 signal at the time switch stage;

E1 interface unit for receiving the trunk data to monitor the No.7 signal at the trunk output stage, selects a specific channel and converts it to 64Kbps channel speed and outputs it;

An interface selection unit for enabling a corresponding output among the outputs of the ST interface unit, the TSW interface unit, and the E1 interface unit when an operator selects a test position to test a signal link in a specific portion;

When the operator selects a channel to test a specific channel of a specific portion, according to the signal channel selection unit for storing the time slot information of the corresponding channel;

A signal link monitor unit configured to receive 64 Kbps channel data of the interface unit enabled by the interface selector to analyze signal messages to monitor the state of the signal link;

A terminal interface unit for interfacing the signal link monitor unit with a terminal and transferring an interface selection signal and a channel selection signal; And

It allows the operator to select the location and the channel to be tested, characterized in that the terminal is configured to display the results of the selected channel to the operator.

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

First, the signal link system in the digital electron exchanger (TDX-10 series) will be described to facilitate understanding of the present invention.

As described above, the nailed-up paths of the TDX-1 series are ST (11-1 to 11-n), RA (12), CIDB (13), SIDB (14), SWC (15), DLC (16), TRK (17), the nailed-up path in the TDX-10 system is a plurality of signal terminals (21-1 ~ 21-n), and a signal terminal management board (STM: 22) for managing these terminals, A time switch (TSW) 23, a space switch (SSW: 24), a time switch (TSW: 25), and a relay line interface unit (TRK: 26).

Further, the interface between the time switch section TSL 31 and No. 7 signal device SS7U: 30 is transmitted from the TSL 31 to the signal message processing processor SHPA 32, as shown in FIG. RxD, TxD transmitted from SHPA 32 to TSL 31, clock CLK transferred from TSL 31 to SHPA 32, and frame sync FS transmitted from TSL 31 to SHPA 32. ) By signal lines. The SHPA 32 and the signal terminals 21-1 to 21-n are connected by an ST-bus and a buffered subhighway.

The apparatus for monitoring the signal link of the TDX-10 system at all times, as shown in FIG. 5, receives link data at the output terminal of the signal terminal ST and receives the link data at 64 Kbps channel speed. A signal terminal interface 44 for outputting the converted signal; A time switch interface unit 45 for receiving the link data of the subhighway to monitor the No. 7 signal at the time switch (TSW) stage, selecting a specific channel, and converting it to a channel speed of 64 Kbps; E1 interface unit 46 for receiving the trunk (E1) data to monitor the No.7 signal at the trunk output terminal, selects a specific channel and converts it to 64Kbps channel speed and outputs it; When the operator selects a test position to test a signal link in a specific portion, an interface selection for enabling a corresponding output among the outputs of the ST interface unit 44, the TSW interface unit 45, and the E1 interface unit 46 is performed. Part 43; When the operator selects a channel to test a specific channel of a specific portion, according to the signal channel selection unit 42 for storing the timeslot information of the corresponding channel; A signal link monitor unit 47 which receives 64 Kbps channel data of the interface unit enabled by the interface selector 43 and analyzes a signal message to monitor a signal link state; A terminal interface unit 41 for interfacing the signal link monitor unit 47 with a terminal and transferring an interface selection signal and a channel selection signal; And a terminal 50 for allowing an operator to select a location and a channel to be tested and for displaying the results of the selected channel to the operator.

Next, the operation of the present invention configured as described above will be described.

2 and 3, the physical path through which the nailed-up path signal data of the signal link is transmitted, and check points for each stage (A, B, C in FIG. 2 and A, B, B in FIG. By installing ', C) and testing them sequentially, fault zones can be easily detected and the operational status of the signal link can be monitored at all times.

The characteristics of each matching part in the nailed-up path are shown in Table 1 below.

The hardware configuration of the signal monitor (SPM) device is largely comprised of a signal monitor processor board (SPMA), which is a main processor board, a monitor back board (SPABB), which is a main board, and a terminal 50 for an operator interface. Receives the corresponding data according to the matching position through the back board (SPABB) as shown in Table [1], and converts the data into a channel speed of 64 Kbps in the case of subhighway data. That is, as shown in Table [1], the ST interface unit 44 is connected to the signal terminal by the RXD, TXD, and CLK lines as the TTL level signal of 64 Kbps, and the time switch interface unit 45 is the subhighway of 2M. It is connected to the time switch stage by the TXD, RXD, CLK, and FS lines, and the E1 interface unit 46 is connected to the trunk output terminal as a bipolar signal operating in the PCM relay line. Therefore, the data of 2Mbps coming from the time switch (TSW) is extracted to 64Kbps by extracting only the data of the specific channel selected for testing in the RA part, and the E1 data coming from the PCM is determined by the circuit of the line interface part 46. The data is converted to 64 Kbps.

In addition, the SPMA has built-in software for monitoring the signal link status, so that the status of the signal channel according to the No. 7 protocol can be monitored.

The signal channel selector 42 is implemented as a register to store the corresponding channel when the user wants to match the time switch TSW or trunk E1. When the user selects one of the ST stage, the TSW stage, and the E1 stage, the interface stage selector 43 connects the corresponding test stage and the path, and the ST interface 44 signals the data coming from the ST stage. The link monitor function converts the data into 64 Kbps so that it can be recognized as No.7 signal message, and the time switch interface unit 45 extracts only the channel data corresponding to the signal channel selector from the 2 Mbps data coming from the time switch stage. The E1 interface 46 converts the TX and RX data into 64 Kbps data of the TTL level at the PCM OR stage. The signal link monitor function unit 47 analyzes 64 Kbps data from the ST interface unit 44, the time switch interface unit 45, and the E1 interface unit 46 so that the user can know the state of the signal link being monitored. Process.

As described above, according to the present invention, No. 7 It is possible to test the signal link status online at all times on the nailed-up path where the signal link is formed, so that the signal setup can be facilitated and maintenance is convenient.

Claims (1)

A signal terminal interface 44 which receives link data and converts the signal to 64 Kbps channel speed to monitor the No. 7 signal at the output terminal of the signal terminal ST; A time switch interface unit 45 for receiving the link data of the subhighway to monitor the No. 7 signal at the time switch (TSW) stage, selecting a specific channel, converting the signal to a 64 Kbps channel speed, and outputting the specific channel; An E1 interface unit 46 for receiving trunk (E1) data to monitor the No. 7 signal at the trunk output terminal, selecting a specific channel, and converting the selected channel to 64 Kbps channel speed; When the operator selects a test position to test a signal link in a specific part, an interface selection for enabling a corresponding output among the outputs of the ST interface unit 44, the TSW interface unit 45, and the E1 interface unit 46 is performed. Part 43; If the operator selects a channel to test a specific channel of a specific portion, accordingly, the signal channel selector 42 for storing the timeslot information of the channel; A signal link monitor unit 47 which receives 64 Kbps channel data of the interface unit enabled by the interface selector 43 and analyzes a signal message to monitor a signal link state; A terminal interface unit 41 for interfacing the signal link monitor unit 47 with a terminal and transferring an interface selection signal and a channel selection signal; And a terminal (50) for allowing an operator to select a location and a channel to be tested and for displaying the result of the selected channel to the operator.