KR20030053847A - Communication method between dslam equipment and up in tam system - Google Patents

Abstract

PURPOSE: A communication method between a DSLAM(Digital Subscriber Line Access Multiplexer) equipment and a UP(Unix Processor) in a TAM(Total Access Module) system is provided to continuously perform a communication between a UP and a DSLAM through another path if one transmission path has an error. CONSTITUTION: When a UP receives an EMS(Element Management System) command(S61), it checks whether an STM-1 port connected to a DSLAM equipment has an error to judge whether the EMS command can be transmitted through the STM-1 port(S62). If the EMS command can be transmitted through the STM-1 port, the UP converts a TL1 command, that is, the EMS command, into an AAL5 ATM cell(S63), and transmits the EMS command of the AAL5 ATM cell type to a DSLAM equipment through an optical cable connected to the STM-1 port(S64). If the EMS command transmission is not possible through the STM-1 port, the UP converts the TL1 command into a UDP packet(S65) and transmits the EMS command of the UDP packet type to the DSLAM equipment through an Ethernet(S66). The DSLAM equipment analyzes and processes the EMS command, generates its result in the TL1 format, and transmits it to the EMS through the UP(S67,S68).

Description

Communication method between DSLA equipment and SS in TAM system {Communication Method Between DSLAM Equipment And UP In TAM System}

The present invention relates to communication between a Digital Subscriber Line Access Multiplexer (DSLAM) device and a Unix Processor (UP) in a total access module (TAM) system. In particular, an UP that performs an element management system (EMS) function in a TAM system is a DSLAM device. In the case of transmitting a command to the DSLAM device in the TAM system that enables not only in-band communication through the STM-1 port but also out-band communication through Ethernet between the UP and DSLAM devices. It relates to a communication method between UP.

Recently, a total access module (TAM) system was developed to efficiently handle voice and data traffic for PSTN / ISDN (Public Switched Telephone Network / Integrated Service Digital Network) subscribers and rapidly expanding high-speed xDSL subscribers. The TAM system aims to provide voice and data integration services by accepting PSTN / ISDN / xDSL subscribers locally and remotely.

On the other hand, the general TAM network configuration is as shown in Figure 1, the local subscriber (usually, subscribers located within a distance of 4Km) is accommodated in the TAM system 11, using the E1 / T1 matching It provides a voice service with a PSTN / ISDN subscriber, which is an LE subscriber, through interworking with a local exchange 12.

In addition, the remote subscriber (usually, a subscriber located at a distance of 4 km or more) is accommodated in the RAM (Remote Access Module) system 14 and uses the E1 / T1 / DS-3 / STM-1 matching with the TAM system 11. It provides a voice call service between the TAM subscriber and the LE subscriber through direct interworking or interworking with the TAM system 11 via an ATM (Asynchronous Transfer Mode) network.

In addition, the TAM system 11 directly transmits data traffic of the TAM subscriber and the RAM subscriber with the NAS / RAS (Network Access Server / Remote Access Server) server 13 using E1 / T1 / DS-3 / STM-1 matching. Or a data call service to a TAM subscriber and a RAM subscriber through interworking with the NAS / RAS server 13 via an ATM network.

That is, the TAM system 11 accommodates the remote subscriber in the RAM system 14, provides voice call service between the RAM subscribers under the control of the local exchange LE, and E1 / T1 / DS-3 / STM-1. Voice call between TAM subscriber and RAM subscriber under the control of local exchange 12 through direct interworking of TAM system 11 and RAM system 14 using matching or RAM system 14 via ATM network. Provide service.

In addition, the TAM system 11 is a data traffic of the TAM subscriber is connected to the direct NAS / RAS server 13 using E1 / T1 / DS-3 / STM-1 matching or NAS / RAS server via the ATM network ( The data call service is provided to the TAM subscriber through interworking with 13). In the case of data traffic of the RAM subscriber, the data call service is provided to the RAM subscriber by interworking with the NAS / RAS server 13 through the TAM system 11.

In this case, referring to the internal functional block of the TAM system 11, as shown in FIG. 2, the digital subscriber line access multiplexer performing a multiplexing and demultiplexing function for processing the aforementioned voice and data traffic. ), As well as the ability to send and receive voice and data traffic through E1 / T1 / DS-3 / STM-1 matching and ATM networks, and operate / maintain through EMS interworking do.

In the conventional TAM system having such a configuration, a method of communicating between the DSLAM equipment 31, the main processor (MP) 32, the unix processor (33), and the element management system (EMS) 34 is attached. Referring to FIG. 3, when an operator inputs a necessary command through the EMS 34, the UP 33 performing element management function (EMS) at the TAM system side is an SNMP (Simple) from the EMS 34. It analyzes network management messages for an entity according to the Network Management Protocol (IP) protocol, and uses MP (Inter Processor Communication) communication to collect or fulfill the requirements defined in the SNMP protocol with each MP (32). 32), the MP 32 transmits data received from the EMS 34 through the UP 33, that is, the EMS command to the DSLAM device 31 through the optical cable of the STM-1 port.

Therefore, conventionally, when the MP and DSLAM equipment communicates in-band through the STM-1 port under the control of the UP while operating the TAM system, if the optical cable of the STM-1 port fails, There is a problem in that communication between them is lost, and in this case, DSLAM equipment cannot be controlled in the UP that performs the EMS function of the TAM system.

The present invention is to solve the problems as described above, the object of which is to dualize to enable in-band communication through the DSLAM equipment and the STM-1 port or out-of-band communication through Ethernet in the UP of the TAM system, Even if a transmission path fails, communication between UP and DSLAM devices can be performed through other paths.In particular, DSLAM devices can be controlled through Ethernet communication even when an optical cable of an existing STM-1 port fails. have.

1 is a diagram illustrating a general TAM network configuration.

FIG. 2 illustrates the internal functional blocks of the TAM system of FIG.

3 is a view for explaining a communication method between the DSLAM equipment and the UP in a conventional TAM system.

4 is a diagram illustrating an implementation of communication redundancy between a DSLAM device and a UP in a TAM system according to the present invention;

5 is a diagram illustrating a protocol stack in implementing communication redundancy between a DSLAM device and a UP in a TAM system according to the present invention.

FIG. 6 is a flowchart illustrating an operation of receiving a result from a DSLAM device after the UP commands a DSLAM device in a TAM system according to the present invention. FIG.

A feature of the present invention for achieving the object as described above, in the communication method between the DSLAM equipment and the Unix processor performing the EMS function in the TAM system, Ethernet after converting the EMS command to UDP packets or ATM cells in the Unix processor Or transmitting to the DSLAM device through an STM-1 path; After analyzing the EMS command received from the DSLAM device and processing the command processing result of transmitting the EMS command to the Unix processor via the path received the EMS command communication system between the DSL and the UE To provide.

The transmitting of the EMS command to the DSLAM device may include: checking whether the EMS command is transmitted by checking whether an STM-1 port connected to the DSLAM device is in a unix processor; If the EMS command can be transmitted through the STM-1 port, converting the EMS command into an ATM cell by the UNIX processor and transmitting the EMS command to a DSLAM device through an optical cable of the STM-1 port; If it is not possible to transmit an EMS command through the STM-1 port, converting the EMS command into a UDP packet in the Unix processor, and transmitting the DSLAM device through Ethernet.

In the process of transmitting the EMS command processing result from the DSLAM device to the Unix processor, when the EMS command is received through the STM-1 path, the EMS command result is converted into an ATM cell and then the Unix through the STM-1 path. Transmitting to a processor; When the EMS command is transmitted via Ethernet, converting the command processing result into a UDP packet and transmitting the result to the Unix processor through the Ethernet.

In another aspect, the present invention provides a communication method between a DSLAM device and an Unix processor that performs an EMS function in a TAM system, wherein the SLA-1 device converts its state information or alarm information into an ATM cell and a UDP packet. Transmitting to the Unix processor via a path and Ethernet; In the TMS system, the Unix processor includes a process of receiving only the information that arrives first from the information received in the form of an ATM cell through the STM-1 path and the information received in the form of a UDP packet through the Ethernet, and outputting the received information to an operator window. It is to provide a communication method between SL equipment and the UI.

Furthermore, in the above-mentioned TMS system, the communication method between the DSL device and the UI may include an Ethernet layer and an IP layer in a user interface block of the UNIX processor and the DSLAM device for UDP packet transmission over the Ethernet of the UNIX processor and the DSLAM device. And further implementing the layer, the UDP layer, the RPL2 layer and the TL1 layer.

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

In the TAM system according to the present invention, the communication between the DSLAM device and the UP is performed using the optical cable of the STM-1 port (hereinafter, referred to as 'in-band communication') and Ethernet as shown in FIG. 4. Dual communication is used to enable communication (Ethernet) (hereinafter, referred to as 'out-of-band communication'), which causes an error in the optical cable connected to the STM-1 port between the DSLAM device and the MP. In this case, it is possible to communicate between the DSLAM device and the UP via Ethernet. In this case, IPC communication is performed between the MP and the UP, and communication between the UP and the EMS outside the TAM system is performed according to the SNMP protocol. do.

In the TAM system according to the present invention, the implementation of communication duplication between the DSLAM device and the UP is shown in FIG. 5 attached to a user interface block and the UP of the DSLAM device, out-band communication. It can be implemented by adding an Ethernet layer, an IP layer, an Internet Protocol (IP) layer, a user datagram protocol (UDP) layer, a Reliable Protocol Layer 2 (RPL2) layer, and a TL1 layer.

Here, when the protocol stack added for out-of-band communication is described based on the DSLAM device, the Ethernet layer performs a function of transmitting and receiving an IP packet, which is a communication message with a UP transmitted / received through an Ethernet port, in the form of bits. Sets the path of IP packets sent and received through the Ethernet layer and sends and receives the corresponding IP packets to the destination.

Unlike the TCP protocol, the UDP layer transmits and receives packets without establishing a connection (session), and performs fast packet transmission and reception. However, since the reliability of the packet transmission and reception is not guaranteed, the UDP layer interworks with the RPL2 layer.

The RPL2 layer receives the packet from the lower layer UDP layer and delivers the packet to the upper TL1 layer.If the received packet number is not correct, the RPL2 layer discards the corresponding packet and discards the packet number. If the sender requests retransmission to UP and transmits the packet transmitted from the upper TL1 layer through the UDP layer, and the response (ACK) does not arrive within a certain time, the packet is lost. Retransmission is determined and the next packet is transmitted when a response is normally received. This ensures the reliability of communication by supplementing the instability of the UDP layer in performing high-speed communication using the UDP layer between the DSLAM device and the UP.

The TL1 layer interprets the TL1 command transmitted from the UP side and notifies the result, or periodically performs the highest layer function used to send a packet to the UP.

In the TAM system according to the present invention, the communication operation between the DSLAM device to which the above-described protocol stack is added and the UP is received from the DSLAM device after receiving a command from the UP performing the EMS function to the DSLAM device in the TAM system, or the DSLAM device. In case of transmitting its status information or alarm generation to UP, it will be described as follows.

First, an operation of receiving a result from a DSLAM device after giving a command to a DSLAM device in UP will be described with reference to FIG. 6.

First, when the EMS command is sent from the UP of the TAM system to the DSLAM device, the UP converts the TL1 command, which is an EMS command, into a UDP packet or an AAL5 ATM cell, and then through an Ethernet or STM-1 port, which is a physical transmission path, respectively. Will be sent to the DSLAM device.

At this time, upon receiving the EMS command from the UP (step S61), the STM-1 port connected to the DSLAM device is checked for failure, and it is checked whether the EMS command can be transmitted through the STM-1 port (step S62). .

If the EMS command can be transmitted through the STM-1 port, UP converts the TL1 command, which is an EMS command, to an AAL5 ATM cell (step S63), and then converts the converted EMS command in the form of an AAL5 ATM cell to the STM-1 port. The cable is transmitted to the DSLAM device (step S64).

However, if the EMS command cannot be transmitted through the STM-1 port, the UP converts the TL1 command, which is an EMS command, to a UDP packet (step S65), and then converts the EMS command in the form of the converted UDP packet to the DSLAM device via Ethernet. The transfer is made (step S66).

In addition, the DSLAM device receiving the EMS command through STM-1 or Ethernet analyzes the EMS command, processes the EMS command, generates the result in TL1 format, and transmits the result to the EMS through UP (step S67, step S68). The DSLAM device that processed the EMS command sends the result of processing the EMS command to UP through STM-1 port or Ethernet, which is the path of receiving the corresponding EMS command. In other words, when an EMS command is transmitted through the STM-1 port, the command result is converted into an ATM cell and then transmitted to the UP through the optical cable of the STM-1 port. When an EMS command is transmitted through Ethernet, After converting the command result into UDP packet, it is sent to UP through Ethernet.

Secondly, if the DSLAM device describes the operation of transmitting its status information or alarm generation to UP, the DSLAM device periodically transmits its status information or alarm information generated in itself to UP, in which case the status information or After converting the alarm information into ATM cell type and UDP packet type, the information is transmitted to UP through each transmission path, that is, through optical cable and Ethernet of STM-1 port.

Then, the UP transmits only the data that arrives first from the data received in the form of ATM cell through the optical cable of the STM-1 port and the data received in the form of UDP packet via Ethernet to the EMS, so that the status information of the DSLAM device is displayed in the operator window. Alarm information can be output.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention is dualized to enable in-band communication through the DSLAM device and the STM-1 port or out-of-band communication through the Ethernet in the UP of the TAM system, even if a failure occurs in one transmission path through another path. Communication between UP and DSLAM devices can be performed, and DSLAM devices can be controlled through Ethernet communication, especially when the fiber cable of the existing STM-1 port fails.

Claims (5)

In a communication method between a DSLAM device and a Unix processor performing an EMS function in a TAM system, Converting an EMS command from a Unix processor to a UDP packet or an ATM cell and then transmitting the EMS command to the DSLAM device through an Ethernet or STM-1 path; After analyzing the EMS command received from the DSLAM device and processing the command processing result of transmitting the EMS command to the Unix processor through the path received the EMS device and Method of communication between hides. The method of claim 1, The process of transmitting the EMS command to the DSLAM device may include: checking whether the EMS command can be transmitted by checking whether a STM-1 port connected to the DSLAM device is failed in a Unix processor; If the EMS command can be transmitted through the STM-1 port, converting the EMS command into an ATM cell by the UNIX processor and transmitting the EMS command to a DSLAM device through an optical cable of the STM-1 port; If it is not possible to send an EMS command through the STM-1 port, the Unix processor converts the EMS command into a UDP packet, and then transmits the DSLAM to the DSLAM device via Ethernet. Method of communication between AM equipment and IP. The method of claim 1, In the process of transmitting the EMS command processing result from the DSLAM device to the Unix processor, when the EMS command is received through the STM-1 path, the command processing result is converted into an ATM cell and then transferred to the Unix processor through the STM-1 path. Transmitting; If the EMS command is transmitted through Ethernet, converting the command processing result into a UDP packet and transmitting the same to a Unix processor through the Ethernet. Way. In a communication method between a DSLAM device and a Unix processor performing an EMS function in a TAM system, Converting, by the DSLAM device, its own state information or alarm information into ATM cells and UDP packets and transmitting the same to the Unix processor via an STM-1 path and Ethernet; And receiving only the first arrival information from the information received in the form of an ATM cell through the STM-1 path and the information received in the form of a UDP packet through the Ethernet, and outputting the received information to an operator window. A method of communication between a DSL device and a PC in an AM system. The method according to claim 1 or 4, The Ethernet layer, the IP layer, the UDP layer, the RPL2 layer and the TL1 layer are additionally implemented in the user interface block of the Unix processor and the DSLAM device for the UDP packet transmission using the Unix processor and the DSLAM device. The communication method between the DSL device and the UI in the TMS system further comprising.