KR100208963B1 - Remote access switching module structure of full electronic switching system - Google Patents

Abstract

The present invention relates to a RASM structure of a conventional electronic switching system, and includes a first module (10) for performing in-test and out-test for an analog subscriber and a digital subscriber, and a second module for performing matching between the analog subscriber and the RASM. 12, the third module 14, which not only supplies the call signal current required for the subscriber circuit to the first module 10 and the second module 12, but also controls the ring relay of the subscriber circuit, for call processing. Fourth module 16 for performing matching and signal processing with the host, fifth module 18 for performing digital relay line matching, and sixth module 20 for performing matching with digital subscriber monitoring / control / maintenance / PP. Transmission characteristics test according to the use of the relay line with another switch in case of link failure with the host, the seventh module 22 matching the primary group access ISDN subscriber, the eighth module 24 matching the primary group multiplexing device to the switch. 9th module 26 to perform the SRA A tenth module 28 matching with the SM, an eleventh module 30 for providing a network synchronizer service, a twelfth module 32 for performing subscriber recording guide service, and an signaling service for call connection and progression A thirteenth module 34, a fourteenth module 36 for real-time processing of signals from device devices, a fifteenth module 38 for providing a control communication channel between the fourteenth module 36 and a control device, and 16th module 40 for call processing, operation and maintenance, control of peripheral devices, 17th module 42 for exchanging communication messages between processors, multiplexing and demultiplexing of PCM data, primary aggregation of PCM data A load distribution of the INP in the INS, including the eighteenth module 44 for performing a function, the nineteenth module 46 for performing a timeslot interchange operation, and the twentieth module 48 for performing a packet service. To reduce the number of processors, and to significantly reduce the number of processors. The control packet service is able to process while still enabling faster reliability.

Description

RASM structure of the national electronic exchange

The present invention relates to a RASM (Remote Access Switching Module) structure of a national electronic switchgear, and more particularly, to a RASM structure of a national electronic switchgear that can provide a remote subscriber with the same communication service as a subscriber housed in a home country. will be.

Typically, the electronic exchanger was developed and put into practice for the first time in the world by the US ATT in May 1965, and has since continued to develop with the introduction of new technologies.

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, reliability, and various services to lead a complex information society. As a system that can be provided, the TDX series electron exchanger, which is now called an electron exchanger, is 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. It is easy to add new functions based on modular structure, decentralized control function using 32-bit commercial microprocessor, and message communication by high-speed IPC (Inter-Processor Communication). High speed communication between the two was made.

Such a conventional all-electronic exchanger such as a TDX-10 exchanger typically has an access switching subsystem (ASS) that performs the overall function of localized call processing, and an INS (interconnection network subsystem) that performs the overall function of centralized call processing. It is composed of three subsystems such as Central Control Subsystem (CCS) that performs centralized operation and maintenance functions. The Remote Switching Module (RASM) is designed to efficiently and economically accommodate subscriber groups far from the main body of the exchange. It is further provided.

The RASM in the TDX-10 series of exchanges used the RRC TLDL of the RASM through the HRC and RCDL in the INS of the host to perform the RASM control on the INS. .

The RASM of the TDX-100 series is composed of a plurality of processors such as a main processor (RASP, IOP), peripheral processors (ASIP / DSIP, DTIP / DCIP, TSP, RLIP, LGSP).

In addition, the above-mentioned RASM of the TDX-10 series has a problem of always using a host in order to receive a packet service.

Accordingly, the present invention has been made in view of the above-described prior art, and an object thereof is to provide a RASM structure of a national electronic switchboard, which can simplify the internal structure of the RASM and make packet service more quickly and reliably. have.

According to a preferred embodiment of the present invention to achieve the above object, a first module for performing in-test and out-test for the analog subscriber and the digital subscriber, a second module for performing matching between the analog subscriber and the RASM, A third module which not only supplies the call signal current required for the subscriber circuit to the first and second modules, but also controls the ring relay of the subscriber circuit, a fourth module that performs matching and signal processing with the host for call processing, and digital. A fifth module performing relay line matching, a sixth module performing digital subscriber monitoring / control / maintenance / PP, a seventh module matching primary group access ISDN subscriber, and a first group multiplexing device matching the switch to the exchange 8th module, 9th module performing transmission characteristic test according to use of relay line with other switch in case of link failure with host, 10th module matching SRASM, network An eleventh module for providing a pre-service, a twelfth module for performing a subscriber recording guide service, a thirteenth module for performing a call service and a signaling service, and a fourteenth module for performing real-time processing of signals from device devices A fifteenth module for providing a control communication channel between the fourteenth module and a control device, a sixteenth module for performing overall call processing and operation and maintenance, a control device for a peripheral device, a seventeenth module for exchanging communication messages between processors, An electrician, comprising an eighteenth module for multiplexing and demultiplexing PCM data, a first module for performing primary aggregation of PCM data, a nineteenth module for performing timeslot interchanging operations, and a twentieth module for performing packet services The RASM structure of the exchange is provided.

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

* Explanation of symbols on important parts of the drawing

10: TEC (Test Equipment Circuit) / ITEC,

12: analog subscriber interface (ASI),

14: RG (Ring Generator),

16: RI (RASM Interface),

18: TI (Trunk Interface),

20: Digital Subscriber Interface (DSI),

22: primary rate subscriber interface (PSI),

24: BAMI (Basic Access Multiplexing Interface),

26: TTC (Test Trunk Circuit), 28: SRI (SRASM Interface),

30: RASES Network Synchronization (RNES),

32: VMH (Voice Message Handling), 34: LSI (Local Service Interface),

36: PP (Peripheral Processor), 38: SWITCH I / F,

40: RASP (Remote Access Switching Processor),

42: CI (Control Interface), 44: DLC (Digital Line Concentration),

46: TSW, 48: Packet Handling Module (PHM).

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

1 is a view showing a RASM structure of a local electronic switch according to a preferred embodiment of the present invention, an embodiment of the present invention is a TEC / ITEC (10), ASI (12), RG (14), RI (16) , TI (18), DSI (20), PSI (22), BAMI (24), TTC (26), SRI (28), RNES (30), VMH (32), LSI (34), PP (36) , SWITCH I / F 38, RASP 40, CI 42, DLC 44, TSW 46, and PHM 48.

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 Out-test is performed to measure the 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) mainly performing monitoring, control, and test functions of the subscriber and the trunk line interface, and between the analog subscriber and the RASM. 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 RI (RASM Interface: 16) is matched with ASS and E1 or Optic of the host for RASM call processing, and performs a signal processing function.

The TI (Trunk Interface: 18) is a block that performs a European type (2.048Mbps) digital relay line matching function.It directly controls a CEPT type digital relay line to perform signal transmission, operation and monitoring and test operation of the relay line. Transmitting, receiving and testing signals as interface with CEPT type digital repeater among relay repeaters. In particular, in case of a connection failure with a host (eg, a RI (16) link failure), a connection with another exchange is performed to provide a service through an adjacent station.

The digital subscriber interface (DSI) 20 is a 2B + D matching digital subscriber matching block, and performs a matching function with the PP 36 which monitors, controls, maintains, and describes digital subscribers.

The primary rate subscriber interface (PSI) 22 performs a matching function with a primary group access ISDN subscriber, and performs a primary group access subscriber matching, a D-channel protocol processing, and a matching function with the PP 36 in a 30B + D matching scheme. do.

The Basic Access Multiplexing Interface (BAMI) 24 performs a function of matching an n (2B + D) type primary group multiplexing device in a RASM to an exchange.

The TTC (Test Trunk Circuit) 26 performs a transmission characteristic test on the relay line when the relay line with the other exchanger is used in case of a link failure with the host.

The SRI (SRASM Interface: 28) is matched with SRASM and E1 to perform a signal processing function.

The RNES (RASM Network Synchronization: 30) performs a control and operation function of the network synchronizer in the RASM.

The VMH (Voice Message Handling: 32) records or plays back a voice message under the control of an announcement broadcasting device and performs a self test for maintenance. The PCM subhighway (sub-path) is used to transmit and receive voice messages. It is matched with TSW 46 mentioned later via the highway.

The LSI (Local Service Interface) 34 is a signal service matching block that provides a signaling service function used for call connection and progression, and transmits or receives R2MFC and DTMF signals, continuity test tones, and audible tones. .

The Peripheral Processor (PP) 36 performs lower levels of work requiring real-time processing of signals such as sensing and instantaneous analysis from devices in the RASM.

The SWITCH I / F 38 provides a control communication channel between the PP 36 and a control device.

The RASP (Remote Access Switching Processor) 40 performs an overall call processing function, an operation and maintenance function, an ISDN access layer 3 function in the RASM, and performs a control function of a peripheral device in the RASM.

The CI (Control Interface: 42) functions to exchange an InterProcessor Communicati-on (IPC) message for the RASP 40 to communicate with a host, a SRASM, and a processor of another RASM.

The DLC 44 performs not only the multiplexing and demultiplexing functions of the PCM data, but also performs a primary condensing function (eg, 2: 1 to 4: 1) of the PCM data.

The TSW 46 has a T-switch in a T (Time) -S (Space) -T (Time) switch structure and performs an interchanger function of a time slot.

Here, the DLC 44 is installed at the front end of the TSW 46. The reason is that the local electronic switchboard can accommodate almost twice as many subscriber lines as the conventional TDX-10 series switch. This is to reduce the burden on the time switch constituting the TSW 46.

In addition, the PHM (Packet Handling Module: 48) performs layer 2 and layer 3 functions such as ITU-T X.25, X.75, and ISDN internal protocol, and is also responsible for a PAD (Packet Assembler / Disassembler) function. In the present invention, communication between packet modules is performed through an internal bus.

On the other hand, the system capacity of the RASM according to an embodiment of the present invention, the first subscriber is more than 8000, the relay player is more than 960, the traffic capacity (Erlang) is more than 800, the call processing capacity (BHCA) is more than 40000 The ISDN access line is over 4000.

Next, a description will be given of the operation of the RASM structure of the local electronic switch according to the embodiment of the present invention configured as described above.

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

First, in case of a voice call (internal code), when the calling subscriber hooks off, the subscriber line state is detected by the PP 36 through the ASI 12. In the PP 36, call origination information and subscriber line are detected. Pass the position of to the RASP (40). Subsequently, the RASP 40 instructs the PP 36 to control the LSI 34 to send a dial tone to the ASI 12 through the TSW 46, and the ASI 12 to the calling party. It will supply dial tone. Accordingly, when the calling subscriber inputs a digit after receiving a tone, the MFC signal according to the digit input is received by the PP 36 and sent to the LSI 34 through the TSW 46 to be interpreted. do. The PP 36 sends the number information to the RASP 40, and the RASP 40 switches the dial tone to the PP 36 after receiving the first number. Here, the RASP 40 instructs to connect the TSW 46 through the PP 36 according to the called party information when the subscriber performs the translation of the station number while dialing, and the translation result is the internal call. Accordingly, the PP 36 controls the LSI 34 according to the instruction of the RASP 40 to request the caller to connect the ring back tone through the already established path and to ring the callee. Requires. After that, when the called party hooks off, the loop state is detected by the PP 36, and the PP 36 sends the information to the RASP 40, and the RASP 40 sends the PP 36. ) Will require ring back tone transfer and ring transfer.

Next, in the case of a voice call (host call), when the calling subscriber hooks off, the subscriber line state is detected by the PP 36 through the ASI 12. In the PP 36, call origination information and subscriber line are detected. Pass the position of to the RASP (40). Subsequently, the RASP 40 instructs the PP 36 to control the LSI 34 to send a dial tone to the ASI 12 through the TSW 46, and the ASI 12 to the calling party. It will supply dial tone. Accordingly, when the calling subscriber inputs a digit after receiving a tone, the MFC signal according to the digit input is received by the PP 36 and sent to the LSI 34 through the TSW 46 to be interpreted. do. The PP 36 sends the number information to the RASP 40, and the RASP 40 switches the dial tone to the PP 36 after receiving the first number. Here, the RASP 40 performs the station number translation while the subscriber dials and passes the translation information to the INP of the host, and the INP performs routing control. The INP translates the called party number and requests the called party to make a call. The called party ASP informs the calling RASP that it has occupied the called party, and the INP requests the INS-PP to connect the spatial switch. The calling RASP then requests the PP to make a 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 ringback tone through the already established path, and controls the LSI to connect the ring to the called party through the already established path. . Accordingly, when the called party hooks off, the loop state is detected by the ASS-PP, and the ASS-PP sends the information to the ASP. The called party ASP requests ringback tone transfer from the calling RASP. Ask the destination ASS-PP for a ring switch. The called party ASP then informs the calling party RASP that the called party has responded.

On the other hand, in the case of a voice call (another call, the relay line uses R2), when the calling subscriber hooks off, the subscriber line state is detected by the PP 36 through the ASI 12. The call origination information and the location of the subscriber line are transmitted to the RASP 40. Subsequently, the RASP 40 instructs the PP 36 to control the LSI 34 to send a dial tone to the ASI 12 through the TSW 46, and the ASI 12 to the calling party. It will supply dial tone. Accordingly, when the calling subscriber inputs a digit after receiving a tone, the MFC signal according to the digit input is received by the PP 36 and sent to the LSI 34 through the TSW 46 to be interpreted. do. The PP 36 sends the number information to the RASP 40, and the RASP 40 switches the dial tone to the PP 36 after receiving the first number. Here, the RASP 40 performs the station number translation while the subscriber dials and passes the translation information to the INP of the host, and the INP performs routing control. The INP translates the called party and asks for possession of the outgoing line. Thereafter, according to the destination ASP, the ASS-PP controls the LSI to occupy the R2 signal maintenance, and the destination ASP notifies the calling party ASP of the outgoing line occupation. Subsequently, the ASP in the ASS of the host associated with the RASP causes the LSI to transmit the number and other information to the downstream exchange through T1, and the R2 reverse signal sent from the downstream exchange is received by the LSI. It is detected by the side ASS-PP and the information is sent to the ASP.

Thereafter, the called party ASP notifies the calling party RASP that it has occupied the called subscriber, the INP requests the INS-PP to connect the spatial switch, and the calling party RASP requests the PP to connect 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 RASP and the ringing request from the called party ASS-PP. Then, the called party ASP notifies the calling party RASP that the called party 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 billing is stored in the disk while operating in the same way as the internal call processing in the normal state described above. The announcement will be made.

In case of an emergency call (eg, 112, 119, dedicated line, etc.), the service is provided through a trunk line interface with another switch through the TI 18.

According to the present invention as described above, by connecting the RI in the ASS of the host and the RI of the RASM, it is possible to reduce the load sharing of the INP in the INS by performing the conventional RASM control in each ASS, By configuring a single main processor and a single peripheral processor, the number of processors can be greatly reduced. In addition, by providing a packet service processing apparatus in the RASM itself, the packet service can be processed more quickly and reliably.

Claims (2)

The first module 10 for performing the in-test and out-test for the analog subscriber and the digital subscriber, the second module 12 for performing the matching between the analog subscriber and the RASM, and the call signal current required for the subscriber circuit. A third module 14 for supplying to the first module 10 and the second module 12 as well as controlling the ring relay of the subscriber circuit, and a fourth module for matching with the host and performing signal processing for call processing ( 16) a fifth module 18 for performing digital relay line matching, a sixth module 20 for performing registration with digital subscriber monitoring / control / maintenance / PP, a seventh module for matching with primary group access ISDN subscriber ( 22), the eighth module 24 for matching the primary group multiplexing device to the switch, the ninth module 26 for performing the transmission characteristic test according to the use of a relay line with another switch in case of link failure with the host, and the SRASM The tenth module 28, which provides a network synchronizer service 11 module 30, the twelfth module 32 to perform the subscriber recording guidance service, the thirteenth module 34 to perform the signal service for call connection and progress, to perform real-time processing of signals from device devices A sixteenth module 36, a fifteenth module 38 for providing a control communication channel between the fourteenth module 36 and a control device, and a sixteenth module for performing overall call processing, operation and maintenance, and control of peripheral devices; 40, a seventeenth module 42 for exchanging communication messages between processors, a multiplexing and demultiplexing of PCM data, an eighteenth module 44 for performing primary aggregation of PCM data, and performing a time slot interchanging operation The 19th module 46 and the 20th module (48) for performing a packet service, characterized in that the RASM structure of the electric switchboard. 2. The RASM structure according to claim 1, wherein the communication between the twentieth module (48) is performed through an internal bus.