KR20010078510A - WDM link assembling apparatus of multi Synchronous Transport Module-1 ATM NNI - Google Patents

Abstract

PURPOSE: A WDM(Wavelength Division Multiplexing) connection apparatus for transmission between a number of STM-1 class ATM(Asynchronous Transfer Mode) stations is provided to accommodate a transmission link between a number of ATM stations into a large capacity WDM optical transmission system from an ATM switch system by an economical and simple function structure enabling a bidirectional communication of a transmission cell stream between ATM stations using a 2.5 Gbps optical link 1 core. CONSTITUTION: The apparatus comprises a WDM interface function part(110), a photoelectric conversion transmission/reception function part(120), an STM-1 class physical layer match function part(130), an ATM cell processing function part(140), a traffic management function part(150), a switching module match function part(160) and an inter-station transmission link connection board control processing part(170). The WDM interface function part can perform a bidirectional communication through a 1 core optical link by traversing a 2.5 Gbps WDM optical signal of a transmission link between 16 STM-1 class ATM stations. The photoelectric conversion transmission/reception function part converts/demultiplexes the WDM optical signal from the WDM interface function part into an electrical signal and transmits the electrical signal to 16 STM-1 class physical layer match function part, or multiplexes 16 electrical signals from the physical layer match function part to 2.5Gbps electrical signals and then converts them into 2.5Gbps optical signals and transmits them to the WDM interface function part. The traffic management function part performs an NPC(Network Parameter Control) algorithm function as to ATM virtual path and virtual channels.

Description

WDM link assembling apparatus of multi Synchronous Transport Module-1 ATM NNI}

The present invention relates to a transmission WDM link access device between multiple STM-1 ATM stations. More specifically, the present invention relates to an ATM based on a cell-to-cell transmission capability and a plurality of virtual path and virtual channel establishment capabilities using ATM technology in a high-speed transmission network. Transfer between multiple STM-1 ATM stations between switching systems Multiplexed / demultiplexed bidirectional cell streams into a certain class of electrical signals and photoelectric conversion, then connected to high-capacity optical transmission systems via WDM (Wavelength Division Multiplexing) optical core 1 link It relates to a device to.

According to the recent rapid development of communication technology and various service requirements, ATM technology-based communication system using Asynchronous Transfer Mode (ATM) is recognized as a core node of a high-speed communication network that delivers data and voice services.

The ATM technology-based communication system is expected to be operated in major telephone companies of the next generation backbone network for high-speed data communication with high transmission speed, reliability, and various information transmission capability. In addition, due to the development of optical communication device technology, various optical devices having high speed and large capacity transmission functions are rapidly appearing in the commercial market.

Accordingly, the present invention has been made in view of the above-mentioned conventional circumstances, and has been made in a number of ways from an ATM switching system by an economical and simple functional structure that enables bidirectional communication of transport cell streams between ATM stations using a 2.5Gbps optical link 1 core. It is an object of the present invention to provide an inter-station WDM link connection device for accommodating a transmission link between ATM stations in a large capacity WDM optical transmission system.

In order to achieve the above object, multiple STM-1 ATM inter-transmission WDM link connection apparatus according to a preferred embodiment of the present invention, multiple STM-1 for connecting the inter- ATM transmission in a high-speed period transmission network to a large capacity WDM transmission system In a class W ATM link connection between ATM stations,

WDM interface function means for terminating 2.5Gbps WDM optical signals of a plurality of STM-1 ATM station transmission links and enabling bidirectional communication through a 1-core optical link;

The WDM interface function by converting / demultiplexing the 2.5 Gbps WDM optical signal from the WDM interface functional means into an electrical signal, multiplexing a plurality of received electrical signals into a 2.5 Gbps electrical signal, and converting the 2.5 Gbps optical signal Photoelectric conversion transmission / reception function means for sending out means;

STM-1 class physical layer matching function means for performing functions of generation and termination of 155.52 Mbps signals, generation and termination of STM-1 frames, cell extraction / mapping, idle cell processing, and HEC generation according to ITU-T recommendation;

ATM cell processing function means for performing ATM cell generation / termination and generation / removal of unassigned cells and idle cells, and cell header conversion functions;

A traffic management function that performs NPC algorithm function on ATM virtual path and virtual channels through the STM-1 class physical layer matching function means and ATM cell processing function means and extracts traffic parameters of link or virtual path / virtual channels. Way;

ATM cell streams from multiple inter-transport links through the NPC algorithm function are synchronized to STM-1 speed and multiplexed into 2.5Gbps optical signals and transmitted to switching module of switching system or 2.5Gbps optical signals from switching system switching module. Switching module matching function means for demultiplexing and transmitting a cell stream synchronized at STM-1 speed; And

It performs physical layer fault management function, performance monitoring, connectivity check, loop back of ATM virtual path and virtual channel, reports the result, and generates and transmits alarm cell and maintenance cell in case of failure of a specific connection. An inter-station transmission link connection board control processing means for performing a function is provided.

1 is a block diagram of a period transmission network to which the apparatus of the present invention is applied;

2 is a block diagram of a functional unit for processing a transport cell stream between ATM stations of an apparatus according to an embodiment of the present invention;

3 is a block diagram of a WDM (Wavelength Division Multiplexing) interface functional unit shown in FIG. 1;

4A and 4B are configuration diagrams of the photoelectric conversion transmission / reception function unit shown in FIG. 1.

<Description of Symbols for Major Parts of Drawings>

110: WDM interface function

120: photoelectric conversion transmission / reception function

130: STM-1 class physical layer matching function

140: ATM cell processing function

150: traffic management function

160: switching module matching function

170: transmission link access board control processing unit between stations

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

1 is a block diagram illustrating a transmission connection between an ATM switching system, a high speed large-capacity WDM transmission system, and a station in a high speed backbone communication network to which the present invention is applied.

Unlike the existing method of connecting the inter-transmission / reception cell stream of ATM switching system to high-capacity transmission system by using 2 cores of 1 core of each STM-1 class optical transmission / reception link, WDM optical link 1 core is used. Therefore, bi-directional communication of transmission cell streams between stations in an ATM switching system is possible, and a plurality of ATM switching system inter-link transmission links can be connected and accommodated to a single WDM transmission link connection device.

2 is a block diagram of a functional unit for processing a transport cell stream between ATM stations in an apparatus according to an embodiment of the present invention.

The apparatus according to the embodiment of the present invention includes a WDM interface function unit 110, a photoelectric conversion transmission / reception function unit 120, an STM-1 class physical layer matching function unit 130, an ATM cell processing function unit 140, The traffic management function unit 150, the switching module matching function unit 160 and the inter-station transmission link connection board control processing unit 170, and the like.

The WDM interface function unit 110 terminates the 2.5 Gbps WDM optical signal of the transport link between 16 STM-1 ATM stations and enables bidirectional communication through a 1-core optical link.

The photoelectric conversion transmission / reception function unit 120 converts / demultiplexes a 2.5 Gbps WDM optical signal from the WDM interface function unit 110 into an electrical signal to thereby convert 16 STM-1 class physical layer matching functions 130. 16 electrical signals received from the STM-1 class physical layer matching function 130 or multiplexed into 2.5 Gbps electrical signals, and then converted to 2.5 Gbps optical signals and sent to the WDM interface functional unit 110. do.

The STM-1 class physical layer matching function 130 is responsible for generating and terminating a 155.52 Mbps signal according to ITU-T recommendation, generating and terminating an STM-1 frame, cell extraction / mapping, idle cell processing, and HEC generation. Perform the function.

The ATM cell processing function unit 140 performs ATM cell generation / termination, generation / deletion of unassigned cells and idle cells, and cell header conversion.

The traffic management function unit 150 is the STM-1 class physical layer matching function unit 130 to prevent congestion of ATM cell traffic of the switching system due to an ATM cell traffic overload condition in an internal switch link of the switching system; Performs NPC algorithm functions for ATM Virtual Path (VP) and Virtual Channels (VC) through the ATM cell processing function 140, and links or Virtual Paths (VP) / Virtual Channels (VC) Extract and report traffic parameters.

The switching module matching function unit 160 synchronizes the ATM cell streams from the 16 inter-transport links through the NPC algorithm at an STM-1 level and multiplexes them into 2.5Gbps optical signals and transmits them to the switching module of the switching system. It demultiplexes 2.5Gbps optical signal from switching system switching module and sends out synchronized cell stream at STM-1 speed.

The inter-station transmission link access board control processing unit 170 performs ATM virtual paths along with physical layer failure management functions such as extraction and reporting of performance-related coefficients of physical layers, recording and reporting on physical layer failure detection, recovery, generation, and release. Perform performance monitoring, connectivity checks, loop back, etc. on the VP and Virtual Channels, report the results, or create and transmit alarm and maintenance cells for specific connection failures. do.

3 is a block diagram of a Wavelength Division Multiplexing (WDM) interface functional unit according to an embodiment of the present invention.

The WDM interface function unit 110 performs two-way communication while satisfying a signal stabilization of 27 to 30 dB by using one optical core and one WDM optical device for STM-1 class 16 ATM cell stream signals of ATM stations.

In the bidirectional communication, 2.5Gbps optical signal reception from the WDM inter-transport link is received using an arbitrary wavelength 1 PD (Photonic Diode), and 2.5Gbps optical signal transmission to the WDM inter-link transmission link is any wavelength. 2 Terminate using laser diode (LD).

4A and 4B are configuration diagrams of the photoelectric conversion transmission / reception function unit shown in FIG. 1.

4A is a block diagram illustrating a transmission portion of the photoelectric conversion transmission / reception function unit 120. The 15Gbps2 STM-1 class 16 electrical signals are multiplexed by 16: 1 to provide 2.5Gbps electrical signal data and the present apparatus. The 2.5GHz clock generated by using the system clock is converted to 2.5Gbps optical signal and transmitted.

4B is a block diagram illustrating a receiving portion of the photoelectric conversion transmission / reception function unit 120. The 2.5 Gbps optical signal is terminated and converted into a 2.5 Gbps electrical signal, and standard clock reception information of a main transmission network is extracted. Demultiplexing the clock to 1:16 produces 16 155.52Mbps STM-1 electrical signals.

Next, a description will be given of the operation of the transmission WDM link between the multiple STM-1 class ATM station according to an embodiment of the present invention configured as described above.

The WDM Link Assembly of Multi STM-1 ATM NWA (WAMAN) of the present invention is physically one WDM (Wavelength Division Multiplexing) termination interface, that is, a WDM interface function unit 110. The WDM interface function 110 carries 16 STM-1 classes, i.e., bidirectional communication ATM cell streams of 155.52 Mbps (Mega bits per second) ATM stations.

The optical wavelength signal passing through the WDM interface function unit 110 is transmitted to the photoelectric conversion transmission / reception function unit 120 through an optical reception link. The photoelectric conversion transmission / reception function unit 120 demultiplexes the received optical signals into 2.5 Gbps electrical signals. The demultiplexed electrical signals are transmitted from the ATM cell processing function unit 140 to each of the STM-1 class 16 ATM station transmission side input cell streams, and an NPC (Network Parameter Control) algorithm is applied to them and operation administration and maintenance. Multiplexing the cells for IPC (Inter Processor CommNNIcation) communication with respect to the result of the function execution and transmitting them to the switching module through the switching module matching function unit 160.

In addition, the OAM information is extracted and executed from the cells received from the switching module matching function unit 160, and each of the 16 STM-1 frames of the output cell stream between the ATM stations is multiplexed with 2.5 Gbps electrical signals to provide an optical signal. Is sent to the WDM termination interface through the optical transmission link.

According to the present invention as described above, the introduction of the transmission link between STM-1 class ATM stations in the ultra high-speed transmission network is activated, and it is possible to reduce the cost by accommodating the transmission links between multiple STM-1 class ATM stations on a single board. Reducing the price of optical communication devices will reduce the line cost of ATM devices.

In addition, the transmission quality is improved due to the reduction in the number of electrical and optical signal connections.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (3)

In a multi-TMM class ATM WDM link connecting device for accessing an inter-ATM station transmission in an ultra high-speed transmission network to a large capacity WDM transmission system, WDM interface function means for terminating 2.5Gbps WDM optical signals of a plurality of STM-1 ATM station transmission links and enabling bidirectional communication through a 1-core optical link; The WDM interface function by converting / demultiplexing the 2.5 Gbps WDM optical signal from the WDM interface functional means into an electrical signal, multiplexing a plurality of received electrical signals into a 2.5 Gbps electrical signal, and converting the 2.5 Gbps optical signal Photoelectric conversion transmission / reception function means for sending out means; STM-1 class physical layer matching function means for performing functions of generation and termination of 155.52 Mbps signals, generation and termination of STM-1 frames, cell extraction / mapping, idle cell processing, and HEC generation according to ITU-T recommendation; ATM cell processing function means for performing ATM cell generation / termination and generation / removal of unassigned cells and idle cells, and cell header conversion functions; A traffic management function that performs NPC algorithm function on ATM virtual path and virtual channels through the STM-1 class physical layer matching function means and ATM cell processing function means and extracts traffic parameters of link or virtual path / virtual channels. Way; ATM cell streams from multiple inter-transport links through the NPC algorithm function are synchronized to STM-1 speed and multiplexed into 2.5Gbps optical signals and transmitted to switching module of switching system or 2.5Gbps optical signals from switching system switching module. Switching module matching function means for demultiplexing and transmitting a cell stream synchronized at STM-1 speed; And It performs physical layer fault management function, performance monitoring, connectivity check, loop back of ATM virtual path and virtual channel, reports the result, and generates and transmits alarm cell and maintenance cell in case of failure of a specific connection. A transmission WDM link connecting device between a plurality of STM-1 class ATM stations, characterized in that it comprises a control station means for transmitting link link boards for performing functions. The method of claim 1, A WDM link transmission apparatus between a plurality of STM-1 class ATM stations, characterized by satisfying a signal stabilization of 27 to 30 dB by using a WDM optical element in bidirectional communication in the WDM interface function means. The method of claim 2, In the bidirectional communication in the WDM interface functional means, 2.5Gbps optical signal reception from the WDM inter-transport link is received using the first wavelength, and 2.5Gbps optical signal transmission to the WDM inter-link transmission link is different from the first wavelength. A transmission WDM link connection device between multiple STM-1 class ATM stations, characterized in that the terminal is terminated using another second wavelength.