KR100215965B1 - Small remote access switching module structure of full-electronic switching system - Google Patents

Abstract

The present invention relates to a SRASM structure of a conventional electronic switchboard, and includes a TEC / ITEC (10) for performing in-test / out-test on a subscriber line and an ASI (12) for performing matching between an analog subscriber and a remote subscriber subsystem. And RG 14 for supplying the call signal current required for the subscriber circuit and the zero crossing signal for contact protection of the ring relay of the subscriber circuit to the TEC / ITEC 10 and the ASI 12, digital subscriber monitoring and DSI 16 performing control and maintenance operations, SRI 18 performing call processing by matching with host and remote subscriber subsystems, SRNES 20 providing network synchronization services, and subscriber recording guidance services. VMH 22 for performing the operation, LSI 24 for performing the signaling service for call connection and progress, TSW 26 for performing the timeslot interchanging operation, and real-time processing for the signals from the respective modules PP (28) to perform the, and the PP (28) It is configured including the switch interface 30 providing control channel communications between the different modules.

Description

SRASM structure of local electronic exchanger {SMALL REMOTE ACCESS SWITCHING MODULE STRUCTURE OF FULL-ELECTRONIC SWITCHING SYSTEM}

The present invention relates to a SRASM (Small Remote Access Switching Module) structure of a local electronic switchgear, and more particularly, the SRASM structure of a local electronic switchgear that can provide communication services to subscribers of remote locations where a small number of people reside It is about.

As is well known, since the development of electron exchanger using vacuum tube from around 1939, based on several field experiments and technical experience on semiconductor, in May 1965, the world's first electron exchanger No. 1 The ESS was developed and put into practice by the US ATT, and since then, with the introduction of new technologies, electronic exchanges have continued to develop.

These electronic exchangers use high-speed electronic devices such as transistors and integrated circuits to quickly and accurately connect subscriber's communication paths, facilitate maintenance work, and provide flexibility and reliability to lead a complex information society.

As a system capable of providing reliability and various services, TDX series electron exchangers, which are now called so-called electron exchangers, are mainly used.

Such electronic switch is a large-capacity exchanger co-developed by a predetermined exchange producer centering on the Korea Telecommunications Research Institute to cope with the characteristics of various communication networks, ranging from small-capacity in farming and fishing villages (for example, thousands of people) to large-capacity in large cities. It is easy to add new functions based on a modular structure so that it can be economically configured, and decentralization of control functions using 32-bit commercial microprocessor and message communication by high-speed IPC (Inter Processor Communication). In addition, high-speed communication between subsystems by optical fiber links is achieved.

In the case of the conventional all-electronic exchange, for example, TDX-10 exchange, there is a problem in stability such as call cutting during system operation, and application systems such as ISDN, Mobile, and IN (Intelligent Network) are being developed as separate systems. Due to the weak scalability and the high cost per line, the domestic and foreign competitiveness is low, especially when the small-capacity system is installed.

Therefore, in order to solve the above problems, the TDX-10 retrofit exchange was proposed, and since the TDX-10 retrofit exchange performs various functions with separate ASSs for each connection exchange function, it is disadvantageous in price competitiveness in small capacity configuration. Even when only the function is used, the problem arises that the entire connection exchange system must exist.

In addition, the above-described TDX-10 type exchanger has a large number of peripheral processors, which makes the connection of IPC and peripheral devices complicated, and it is economically designed using a small capacity switch, but there is a disadvantage of low reliability, and there is a disadvantage in communication between the peripheral processor and the device. Dose limitations have occurred.

In addition, the above-described TDX-10 retrofit exchanger is a separate system for each analog, digital, packet, No. 7, trunk, and ISDN, and thus not only lacks flexibility in providing various services, but also has the same structure for large capacity or small capacity configuration. Since the cost per line is increased when installing a small system, the scalability by system size is insufficient.

In other words, the above-described TDX-10 and TDX-10 retrofit exchanges are equipped with a remote subscriber subsystem called a Remote Access Switching Module (RASM) for communication services to remote subscribers. It only provides communication services to residents in suburban cities (eg, cities with more than thousands of residents), but for those who live in mountain wallpaper villages or islands with hundreds of residents, The cost was higher and was not supported.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a SRASM structure of a national electric switchboard which enables communication service to a remote subscriber area where a small number of people reside.

According to a preferred embodiment of the present invention to achieve the above object, in an exchange provided to perform a communication service for a remote subscriber in conjunction with a local electronic switchgear, performing the in-test / out-test on the subscriber line The TEC / ITEC 10, the ASI 12 performing matching between the analog subscriber and the remote subscriber subsystem, and the zero crossing signal for contact protection of the call signal current required for the subscriber circuit and the ring relay of the subscriber circuit. RG 14 to TEC / ITEC 10 and ASI 12, DSI 16 to perform digital subscriber monitoring, control and maintenance operations, and host and remote subscriber subsystems to match call processing. SRI 18 to perform, SRNES 20 to provide network synchronization service, VMH 22 to perform subscriber recording guidance service, LSI 24 to perform signaling service for call connection and progression, Timeslot And TSW (26) for performing emitter cheinjing operation, the performing the real-time processing for the signals from each module PP (28) and the PP (28) and a switch interface, which provides a control communication channel between the other modules to

30, wherein the remote subscriber performs a mutual communication service in connection with the pre-exchange electronic switch with a predetermined call path set in the TSW 26 according to the control operation of the PP 28; In case of link failure with the local electronic switchgear, normal communication service is performed only for internal calls matched to the remote subscriber subsystem.

In the case of an external call that provides a communication service to a remote subscriber in connection with the pre-exchange electronic exchange, the SRASM structure of the pre-exchange electronic exchange is configured to notify a predetermined error message through the VMH 22.

1 is a view showing a SRASM structure of a local electronic switch according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: TEC (Test Equipment Circuit) / ITEC,

12: analog subscriber interface (ASI),

14: RG (Ring Generator),

16: digital subscriber interface (DSI),

18: SRI (SRASM Interface),

20: SRNES (SRASM Network Synchornization),

22: Voice Message Handling (VMH),

24: LSI (Local Service Interface),

26: TSW (Time Switch),

28: PP (Peripheral Processor),

30: Switch I / F.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the SRASM structure of the local electronic switch according to an embodiment of the present invention.

1 is a view showing a SRASM structure of a local electronic switch according to a preferred embodiment of the present invention, an embodiment of the present invention is TEC / ITEC (10), ASI (12), RG (14), DSI (16) , SRI 18, SRNES 20, VMH 22, LSI 24, TSW 26, PP 28, and Switch I / F 30.

In the figure, the Test Equipment Circuit (TEC) / ITEC (10) is the in-test (In-test) to indicate whether the transmission loss, dial tone, ring tone, digit transmission, etc. for the subscriber line and AC / DC for the subscriber This is a control module for performing out-test that performs measurement test of voltage, resistance and capacitance.

The ASI (Analog subscriber interface) 12 is an analog subscriber matching block, and belongs to the LTAS (Line and Trunk Access Subsystem) which mainly performs monitoring, control, and test functions of subscriber and relay line interfaces, and between the analog subscriber and the SRASM. Perform the matching function.

And, the RG (Ring Generator: 14) is a zero-crossing for the protection of the 20Hz call signal current (-48V DC current superimposed) required for the subscriber circuit and the ring relay (ring relay) of the subscriber circuit Signal is supplied to the TEC / ITEC 10 and the ASI 12, and is configured in an active / stand-by form.

The DSI (Digital Subscriber Interface) 16 is a 2B + D matching digital subscriber matching block, which is responsible for digital subscriber monitoring, control, maintenance, and matching with the PP 28 described later.

In addition, the SRI (SRASM Interface: 18) is matched with the E1 or Optic for the TDX-100 host for SRASM call processing, and matched with the SRI and E1 of the RASM PSTN (Public Switched Telephone Network), ISDN (Integrated Service Digital) It performs a signal processing function for providing a network, TMN (Telecommunication Management Network) service.

In addition, the SRNES (SRASM Network Synchornization: 20) performs the control and operation of the network synchronizer in the SRASM.

In addition, the VMH (Voice Message Handling: 22) is recorded under the control of the announcement broadcast device, or reproduces the voice message and performs a self test for maintenance bar, PCM subhighway (voice path for transmitting and receiving voice messages) It is matched with TSW 26 which will be described later through the sub-highway.

In addition, the LSI (Local Service Interface) 24 is a signal service matching block that provides a signal service function used for call connection and progress, and has a function of transmitting or receiving R2MFC and DTMF signals, continuity test tones and audible tones. Perform.

In the TSW (Time Switch) 26, a T-switch (for example, a capacity of 10K × 4K) is located in a T (Time) -S (Space) -T (Time) switch structure and the time slot (Time Slot) Perform the Interchanger function.

In addition, the Peripheral Processor (PP) 28 performs not only low-level work requiring real-time processing of signals such as sensing and instantaneous analysis from devices in the SRASM, but also overall call processing and operation and maintenance in the SRASM. Perform the function.

The switch I / F 30 provides a control communication channel between the PP 28 and a control device.

Next, the operation of the SRASM structure of the local electronic switch according to the embodiment of the present invention configured as described above is as follows.

First, the call flow in the steady state will be described.

First, in the case of a voice call (internal call), once the calling subscriber hooks off, the subscriber line status is detected by the PP 28 through the ASI 12, and the call calling information and the subscriber line are in the PP 28. Will determine the location of. Subsequently, the LSI 24 sends a dial tone through the TSW 26 to the ASI 12 through the switch I / F 30 according to the instruction of the PP 28. Accordingly, the ASI 12 supplies a dial tone to the calling party, and the calling subscriber enters a digit after receiving a tone, and the MFC signal according to the digit input is received by the PP 28. The data is sent to the LSI 24 through the TSW 26 for interpretation. Subsequently, the PP 28 switches the dial tone after receiving the first number. During the subscriber's dialing, the PP 28 performs a station number translation, and if the translation result is an internal number, the PP 28 according to the called party information. Instructs the TSW 26 to connect. Then, by controlling the LSI 24 according to the instruction of the PP 28, requesting the subscriber to connect the ring back tone through the already established path, and then in accordance with the instruction of the PP 28. The LSI 24 is controlled to connect a ring to the called party through the already established path. Accordingly, when the called party responds (i.e., hooks off), the loop state is detected by the PP 28, so that the PP 28 requests ringback tone switching and ring switching.

Next, in the case of a voice call (host call), once the calling subscriber hooks off, the subscriber line status is detected by the PP 28 through the ASI 12, and the call calling information and the subscriber line are in the PP 28. Will determine the location of. Subsequently, the LSI 24 sends a dial tone through the TSW 26 to the ASI 12 through the switch I / F 30 according to the instruction of the PP 28. Accordingly, the ASI 12 supplies a dial tone to the calling party, and the calling subscriber enters a digit after receiving a tone, and the MFC signal according to the digit input is received by the PP 28. The data is sent to the LSI 24 through the TSW 26 for interpretation. Subsequently, the PP 28 switches the dial tone after receiving the first number, and while the subscriber dials, the PP 28 performs translation of the station number and hands over the translation information to the host's INP (not shown). The INP is responsible for routing control. After the INP translates the called party, the called party requests the called party to the called party's ASP, and the called party's ASP informs the calling party of the calling party's subscriber. Subsequently, the INP requests the INS-PP to connect the spatial switch, and the calling PP requests the connection by voice call. Then, according to the instruction of the called party's ASP, the ASS-PP controls the LSI, requests the calling party to connect the ring back tone through the already established path, and connects the ring to the called party. Accordingly, when the called party hooks off, the loop status is detected by the ASS-PP, and the ASS-PP sends the information to the ASP. The called party ASP requests a ringback tone transfer from the calling party PP and a ring transfer request from the called party ASS-PP. Thereafter, the called party ASP informs the calling party PP that the called party responds.

On the other hand, in the case of a voice call (another call, the relay line uses R2), once the calling subscriber hooks off, the subscriber line state is detected by the PP 28 through the ASI 12, and the PP 28 The call origination information and the location of the subscriber line are identified. Subsequently, the LSI 24 sends a dial tone through the TSW 26 to the ASI 12 through the switch I / F 30 according to the instruction of the PP 28. Accordingly, the ASI 12 supplies a dial tone to the calling party, and the calling subscriber enters a digit after receiving a tone, and the MFC signal according to the digit input is received by the PP 28. The data is sent to the LSI 24 through the TSW 26 for interpretation. Subsequently, the PP 28 switches the dial tone after receiving the first number, and while the subscriber dials, the PP 28 performs a station number translation and hands over the translation information to the host's INP, and the INP is routed. You are in control. The INP requests the occupancy of the outgoing line after the translation of the called party. Then, according to the instruction of the called party ASP, the ASS-PP controls the LSI to occupy the R2 signaling equipment, and the called party ASP notifies the calling party ASP of the outgoing line occupation. Subsequently, the ASP in the ASS of the host associated with the PP causes the LSI to send the number and other information to the succeeding exchange via DCI (not shown), and the R2 reverse signal from the latter exchange is sent by the called party's LSI. As received, the R2 reverse signal is detected by the called party ASS-PP and the information is sent to the ASP. In addition, the called party ASP informs the calling party that the calling party has occupied the called party, the INP requests the INS-PP to connect the spatial switch, and the calling party PP requests the connection by the voice call. Subsequently, according to the instruction of the called party's ASP, the ASS-PP controls the LSI, requests the calling party to connect the ring back tone through the already established path, and connects the ring to the called party. Accordingly, when the called party hooks off, the loop status is detected by the ASS-PP and the ASS-PP sends the information to the ASP. Thereafter, the called party ASP requests ringback tone transfer from the calling party PP and the ringside switching request from the called party ASS-PP. Then, the called party ASP notifies the calling party that the called party has responded.

In particular, in the case of an internal call in an abnormal state (for example, when a link is disconnected from the host), the internal call processing in the normal state is performed, but in the case of an external call, a guide broadcast is not available.

According to the present invention as described above, even in a remote area (eg, mountain wallpaper villages, islands, etc.) where the number of subscribers is too small to use the RASM equipment, it is possible to provide sufficient communication services corresponding to the functions of the RASM equipment.

Claims (1)

In an exchange provided to perform a communication service to a remote subscriber in connection with a pre-exchange electronic switch, a TEC / ITEC (10) for performing in-test / out-test on a subscriber line and between an analog subscriber and a remote subscriber subsystem RG for supplying the call signal current required for the subscriber circuit and the zero crossing signal for contact protection of the ring relay of the subscriber circuit to the TEC / ITEC 10 and the ASI 12 to perform matching. 14), a DSI (16) for performing digital subscriber monitoring, control and maintenance operations, an SRI (18) for performing call processing by matching with a host and a remote subscriber subsystem, and a SRNES (for providing a network synchronizer service). 20), the VMH 22 performing the subscriber recording guidance service, the LSI 24 performing the signaling service for call connection and progression, the TSW 26 performing the time slot interchanging operation, For signals from the module PP 28 performing real-time processing and a switch interface providing a control communication channel between the PP 28 and the other modules. 30, wherein the remote subscriber performs a mutual communication service in connection with the pre-exchange electronic switch with a predetermined call path set in the TSW 26 according to the control operation of the PP 28; In case of link failure with the local electronic switchgear, normal communication service is performed only for internal calls matched to the remote subscriber subsystem. SRASM structure of a local electronic switchboard, characterized in that to notify a predetermined error message through the VMH (22) in the case of an external call to provide a communication service to a remote subscriber in conjunction with the local electronic switchboard.