KR19980014076A - The RASM structure of the electronic exchanger before the national government (REMOTE ACCESS SWITCHING MODULE STRUCTURE OF FULL ELECTRONICS SWITCHING SYSTEM) - Google Patents

Abstract

The present invention relates to a RASM structure of a pre-service electronic exchange, comprising a first module (10) for performing an in-test and an out test for an analog subscriber and a digital subscriber, a second module (12), a third module (14) for supplying a ringing signal current required for the subscriber circuit to the first module (10) and the second module (12) as well as for controlling the ring relay of the subscriber circuit A fourth module 16 for performing registration and signal processing with the host, a fifth module 18 for performing digital trunk matching, a sixth module 20 for performing digital subscriber monitoring / control / maintenance / ), A seventh module (22) that matches the first-order access ISDN subscriber, an eighth module (24) that matches the first-order multiplexer to the exchange, and a transmission characteristic test A ninth module 26 for performing SRA An eleventh module 30 for providing a network synchronization service, a twelfth module 32 for performing a subscriber recording guidance service, a tenth module 32 for performing signaling service for call connection and progress, 13 module 34, a fourteenth module 36 for performing real-time processing of signals from device devices, a fifteenth module 38 for providing a control communication channel between the fourteenth module 36 and the control device, A 16th module 40 for performing call processing, operation and maintenance, control of peripheral devices, a seventeenth module 42 for exchanging interprocessor communication messages, multiplexing and demultiplexing of PCM data, The nineteenth module 46 performing the time slot interchanging operation and the twentieth module 48 performing the packet service, so that the load sharing of the INP in the INS The number of processors can be greatly reduced, and more The control packet service is able to process while still enabling faster reliability.

Description

RASM structure of electronic exchanger

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a RASM (Remote Access Switching Module) structure of an electronic exchanger before a public service, and more particularly to a RASM will be.

Conventionally, the electronic exchanger was developed and put into practical use by the US ATT for the first time in the world in May 1965, and has since been continuously developed with the introduction of new technology.

Such electronic exchanges are designed to provide flexibility, reliability, and various services to enable quick and accurate access to subscribers' call lines using electronic devices operated at high speeds such as transistors and integrated circuits, to facilitate maintenance work, and to lead a complex information society. Nowadays, TDX series electronic exchanges called so-called all-electronic exchanges are mainly put into practical use.

Such an electronic exchanger is a large-capacity exchanger jointly developed by a certain exchanger manufacturer centering on the Korea Telecommunication Research Institute to cope with characteristics of various communication networks, so that it can be economically constructed from a small capacity of a rural area to a large capacity of a large city It is easy to add new functions based on the modular structure, and it is made possible to decentralize control functions using 32 bit commercial microprocessor and message communication by high speed interprocessor communication (IPC) So that high-speed communication can be achieved.

For example, the TDX-10 exchange may include an ASS (Access Switching Subsystem) that performs overall functions of localized call processing, an INS (Interconnection Network Subsystem) that performs overall functions of centralized call processing, , Central Control Subsystem (CCS) that performs centralized operation and maintenance functions, and a remote exchange module (RASM) for efficiently and economically accommodating subscribers remote from the exchange body. .

The RASM in the TDX-10 series switch exchanges the RASM control with the TLDL of the RASM through the HRC and RCDL in the INS of the host (HOST), thereby performing the RASM control in the INS. .

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

In addition, the above-mentioned RASM of the TDX-10 series has a problem that the HOST must always be used in order to receive the packet service.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned prior art, and it is an object of the present invention to provide a RASM structure of a pre-service electronic exchanger that simplifies the internal structure of RASM and enables packet service more quickly and reliably have.

According to a preferred embodiment of the present invention to achieve the above object, there is provided a communication system including a first module for performing an in-test and an out-test for an analog subscriber and a digital subscriber, a second module for performing a matching between the analog subscriber and the RASM, A third module for supplying the call signal current required for the subscriber circuit to the first and second modules as well as for controlling the ring relay of the subscriber circuit, a fourth module for performing registration and signal processing with the host for call processing, A fifth module that performs trunk line matching, a sixth module that performs digital subscriber monitoring / control / maintenance / PP matching, a seventh module that matches the first-order access ISDN subscriber, a first module that matches the first- 8 module, a ninth module for performing transmission characteristics test according to the use of a trunk line with another exchange in case of a link failure to a host, a tenth module matching SRASM, A twelfth module for performing a subscriber recording guidance service, a thirteenth module for performing a signaling service for call connection and proceeding, a thirteenth module for performing real time processing on signals from device devices, A fifteenth module for providing a control communication channel between the fourteenth module and the control device, a sixteenth module for performing overall call processing, operation and maintenance, control of peripheral devices, a seventeenth module for exchanging interprocessor communication messages, An eighth module for performing multiplexing and demultiplexing of PCM data, a primary aggregation function for PCM data, a nineteenth module for performing time slot interchanging operation, and a twentieth module for performing packet service, The RASM structure of the exchange is provided.

1 is a diagram illustrating a RASM structure of a pre-service electronic exchanger according to a preferred embodiment of the present invention.

[0002] DESCRIPTION OF REFERENCE NUMBERS

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: Basic Access Multiplexing Interface (BAMI)

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

30: RNSM (RASM Network Synchronization),

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

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

40: Remote Access Switching Processor (RASP)

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

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a RASM structure of a pre-service electronic exchange according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a RASM structure of a pre-service electronic exchanger according to a preferred embodiment of the present invention. The embodiment of the present invention includes a TEC / ITEC 10, an ASI 12, an RG 14, The TSI 18, the DSI 20, the PSI 22, the BAMI 24, the TTC 26, the SRI 28, the RNES 30, the VMH 32, the LSI 34, A SWITCH I / F 38, a RASP 40, a CI 42, a DLC 44, a TSW 46, and a PHM 48.

In the figure, the test equipment circuit (ITEC) 10 includes an in-test for inspecting the subscriber line whether the transmission loss, a dial tone, a ring tone, a digit transmission, Out-test is performed to perform measurement test of voltage, resistance, capacitance, and the like.

The analog subscriber interface (ASI) 12 is an analog subscriber interface (ADC), which belongs to the Line and Trunk Access Subsystem (LTAS) which mainly performs monitoring, control, and testing functions of subscribers and trunk line interfaces. And performs a matching function.

The RG (Ring Generator) 14 generates a zero-crossing signal for 20-Hz call signal current (superposed with -48 V DC current) required for the subscriber circuit and a contact of the ring relay of the subscriber circuit ) Signal to the TEC / ITEC 10 and the ASI 12 and is configured in an active / stand-by manner.

The RI (RASM Interface) 16 is matched with the ASS of the host (HOST) to E1 or Optic for RASM call processing and performs a signal processing function.

The TI (Trunk Interface) 18 is a block that performs a digital trunk line matching function according to the European system (2.048 Mbps). It directly controls the CEPT digital trunk line to transmit and receive signals, monitor and test trunk line operation states, It is an interface with a digital trunk line of CEPT system among the relay equipment, and performs signal transmission and reception and testing. In particular, a connection with a host (for example, an RI (16) link failure) is established and a connection with another exchange is performed to provide a service through a neighboring station.

The digital subscriber interface (DSI) 20 is a digital subscriber matching block with a 2B + D matching scheme and performs digital subscriber monitoring, control, maintenance, and matching with a PP 36 described later.

The Primary Rate Subscriber Interface (PSI) 22 performs a function of matching with the primary-group access ISDN subscriber, performs a primary-group access subscriber matching, a D-channel protocol process, and a matching function with the PP 36 in a 30B + do.

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

The TTC (Test Trunk Circuit) 26 performs a transmission characteristic test on the trunk line when a trunk line with another trunk 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 RNAS (RASM Network Synchronization) 30 performs control and operation functions of the network synchronization device in the RASM.

The VMH (Voice Message Handling) 32 performs a self-test for recording or reproducing a voice message under the control of the announcement apparatus and performing maintenance. The voice message handler 32 is connected to a PCM sub- highway to the TSW 46 described below.

The LSI (Local Service Interface) 34 is a signal service matching block that provides a signal service function used for call connection and processing, and performs a function of transmitting or receiving R2 MFC and DTMF signals, continuity test tones, and audible tones .

The PP (Peripheral Processor) 36 performs low-level tasks requiring real-time processing of signals such as detection and instantaneous analyzes from devices in the RASM.

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

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

The CI (Control Interface) 42 exchanges IPC (Interprocessor Communicati- on) messages for communicating with a host, SRASM, or another RASM processor.

The DLC (Digital Line Concentration) 44 performs a primary aggregation function (for example, 2: 1 to 4: 1) of PCM data as well as multiplexing and demultiplexing of PCM data.

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

Here, the DLC 44 is installed at the front end of the TSW 46, because the before-service electronic exchanger can accommodate subscriber lines almost twice as large as the conventional TDX-10 series exchanges. So as to reduce the burden on the time location constituting the TSW 46. [

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

Meanwhile, the system capacity of the RASM according to the embodiment of the present invention is such that the subscriber turnover is 8000 or more, the relay player is 960 or more, the traffic capacity Erlang is 800 or more, the call processing capability (BHCA) is 40000 or more And the ISDN access line is 4000 or more.

Next, the operation of the RASM structure of the pre-service electronic exchanger according to the embodiment of the present invention will be described.

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

First, in the case of a voice call (internal call), when the calling subscriber hooks off, the subscriber line status is detected by the PP 36 via the ASI 12. In the PP 36, To the RASP (40). The PP 36 then controls the LSI 34 to send a dial tone to the ASI 12 via the TSW 46 in accordance with the instruction of the RASP 40 and the ASI 12 is sent to the calling subscriber Dial tone. Accordingly, when the calling subscriber inputs a digit after receiving the tone, the MFC signal corresponding 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, which in turn causes the PP 36 to change the dial tone after receiving the first number. Here, the RASP 40 performs station number translation while the subscriber is dialing, and instructs the TSW 46 to connect through the PP 36 according to the called party information if the translation result is an internal call. Accordingly, the PP 36 controls the LSI 34 in accordance with the instruction of the RASP 40 to request the originating subscriber to establish a ring back tone through the already established path, . Thereafter, when the called subscriber hooks off, a loop condition is detected by the PP 36, which sends the information to the RASP 40, which in turn sends the PP 36 ) To the ring back tone switching and the ring switching.

Next, in the case of a voice call (host call), when the calling subscriber hooks off, the subscriber line status is detected by the PP 36 via the ASI 12. In the PP 36, To the RASP (40). The PP 36 then controls the LSI 34 to send a dial tone to the ASI 12 via the TSW 46 in accordance with the instruction of the RASP 40 and the ASI 12 is sent to the calling subscriber Dial tone. Accordingly, when the calling subscriber inputs a digit after receiving the tone, the MFC signal corresponding 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, which in turn causes the PP 36 to change the dial tone after receiving the first number. Here, the RASP 40 translates the station number while the subscriber dials and transfers the translation information to the INP of the host, and the INP performs routing control. After the INP translates the incoming number, it requests the called ASP to place the call. The destination ASP informs the originating RASP that it has occupied the called subscriber, and the INP requests the INS-PP to connect the spatial switch. The originating RASP then requests the PP to establish a voice call connection. Then, according to the instruction of the destination ASP, the ASS-PP controls the LSI to request the originating subscriber to connect the ring back tone through the already established path, and controls the LSI to link the ring to the called subscriber through the already established path . Accordingly, when the called subscriber is hooked off, the loop status is detected by the ASS-PP, and the ASS-PP sends the information to the ASP, and the called ASP requests the calling RASP for ring back tone switching Request ring switching from the called party ASS-PP. Thereafter, the destination ASP informs the originating RASP that the called subscriber has responded.

On the other hand, in the case of a voice call (other station call and trunk line using R2), when the calling subscriber hooks off, the subscriber line status is detected by the PP 36 via the ASI 12, And transmits the call origination information and the location of the subscriber line to the RASP 40. The PP 36 then controls the LSI 34 to send a dial tone to the ASI 12 via the TSW 46 in accordance with the instruction of the RASP 40 and the ASI 12 is sent to the calling subscriber Dial tone. Accordingly, when the calling subscriber inputs a digit after receiving the tone, the MFC signal corresponding 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, which in turn causes the PP 36 to change the dial tone after receiving the first number. Here, the RASP 40 translates the station number while the subscriber dials and transfers the translation information to the INP of the host, and the INP performs routing control. After the INP translates the incoming number, it requests the occupancy of the outgoing line. Thereafter, according to the destination ASP, the ASS-PP controls the LSI to occupy R2 signal maintenance, and the destination ASP notifies the originating ASP of out-of-line occupancy. Then, the ASP in the ASS of the host related to the RASP causes the LSI to send the number and other information through the T1 to the downstream exchanger, and the R2 reverse signal sent from the downstream exchanger is received by the LSI, Side ASS-PP and the information is sent to the ASP.

After that, the destination ASP informs the originating RASP that it has occupied the called subscriber, INP requests the INS-PP to connect the space switch, and the originating RASP requests the PP to establish a voice call connection. Then, according to the instruction of the destination ASP, the ASS-PP controls the LSI to request a ring back tone connection to the calling subscriber through a predetermined path, and connects the ring to the called subscriber. Accordingly, if the called subscriber hooks off, the Loop state is detected by the ASS-PP and the ASS-PP sends the information to the ASP. After that, the destination ASP requests the calling RASP for ring back tone switching and requests the ringing ASS-PP for ring switching, and then the destination ASP informs the calling RASP that the called subscriber has responded.

In particular, in the case of an internal call in an abnormal state (for example, when a link is disconnected with the host), the billing operation is performed in the same manner as the internal call processing in the steady state described above, I will give you an announcement.

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

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

Claims (2)

A first module (10) for performing an in-test and an out-test for an analog subscriber and a digital subscriber, a second module (12) for performing matching between the analog subscriber and the RASM, A third module 14 for controlling the ring relay of the subscriber circuit as well as supplying the first module 10 and the second module 12, a fourth module for performing signal processing and matching with the host for call processing 16, a fifth module 18 for performing digital trunk matching, a sixth module 20 for performing digital subscriber monitoring / control / maintenance / PP matching, a seventh module for matching a primary access ISDN subscriber 22), an eighth module (24) for matching the first-order multiplexing apparatus to the exchange, a ninth module (26) for performing a transmission characteristic test according to the use of a trunk line with another exchange in case of a link failure with the host, A tenth module 28, 11 module (30), a twelfth module (32) for performing a subscriber recording guidance service, a thirteenth module (34) for performing signaling service for call connection and progress, A fifteenth module (38) for providing a control communication channel between the fourteenth module (36) and the control device, a sixteenth module (38) for performing overall call processing, operation and maintenance, A seventeenth module 42 for exchanging interprocessor communication messages, an eighteenth module 44 for performing multiplexing and demultiplexing of PCM data, a primary aggregation function of PCM data, and a time slot interchanging operation And a twentieth module (48) for performing packet services. The RASM structure of the pre-service electronic exchanger as claimed in claim 1, The RASM structure of claim 1, wherein the communication between the twentieth module (48) is performed via an internal bus.