KR200299294Y1 - Apparatus for switching in asynchronous transfer mode - Google Patents

Abstract

The present invention is to provide a switching device of the asynchronous transmission method, the clock transmission board 10 for transmitting a clock; An ATM high speed switching board (20) having an ATM high speed clock checking unit (40) for checking whether a clock necessary for ATM high speed switching can be received from the clock transmission board (10); By including the ATM switching board 30 for performing ATM switching by providing an ATM clock check unit 50 that can determine whether the clock required for ATM switching from the clock transmission board 10 can be received, the clock By checking the status of the clock as well as the transmission board, it is possible to solve the problem that the function of the ATM switch is paralyzed because the clock does not come out when the clock transmission board is mounted.

Description

Apparatus for switching in asynchronous transfer mode

The present invention relates to a switching device of the asynchronous transfer mode (Asynchronous Transfer Mode, ATM). Especially, the clock transmission board is mounted so that the status of the clock can be checked as well as whether the clock transmission board is dismounted. The present invention relates to a switching device of an asynchronous transmission method that is suitable for solving a problem in which a function of a switch is paralyzed.

In general, the asynchronous transmission method (ATM) is determined by the International Telecommunications Union Telecommunication Sector (ITU-T) (formerly CCITT) as a transmission method of B-ISDN (Broadband ISDN) in 1988, and is a transmission that becomes the core of B-ISDN. Exchange technology. This is a method of dividing all information into fixed length blocks called ATM cells and transmitting them sequentially. Such ATM is a dedicated-connection switching technology that divides digital data into 53 bytes of cells or packets and transmits them through a medium using digital signal technology. One cell is individually processed asynchronously with respect to the other cells and placed in a queue for multiplexing for circuit sharing.

The header contains a Virtual Channel Identifier (VCI) for identifying the connection to which the cell belongs, a Virtual Path Identifier (VPI), and a Cell Loss Priority indicating whether the cell should be discarded during congestion. , CLP), cell information identification (Payload Type, PT) for distinguishing network control information, header error detection and control (Header Error Control, HEC), and the like. The characteristic of ATM multiplexing is that multiplexing efficiency higher than L division can be achieved by statistical multiplexing, and the transmission band allocated to individual communication can be freely set.

Because ATM is designed to be easier to implement in hardware than software, it is possible to speed up processing. Currently, the transmission speed of ATM networks is about 155.520 Mbps or 622.080 Mbps, but the Institute of Electrical and Electronics Engineers (IEEE) spectrum reports that this rate is expected to reach 10 Gbps soon. Along with SONET (Synchronous Optical Network) and several other technologies, ATM is a core technology of the Broadband ISDN (BISDN).

1 is a block diagram of a conventional asynchronous transfer switching device.

As shown therein, a clock transmission board 10 for transmitting a clock; An ATM fast switching board (20) for receiving a clock from the clock transmission board (10) to perform ATM fast switching; The ATM switching board 30 receives a clock from the clock transmission board 10 and performs ATM switching.

In the above, the clock transmission board 10 checks whether the clock transmission board 10 is mounted on a back board, and checks the board state checking unit for notifying the ATM fast switching board 20 and the ATM switching board 30 ( 11); The ATM high speed switching board 20 and the clock switching unit 12 for transmitting a clock to the multiplexing unit 23, 33 inside the ATM switching board 30, respectively.

The ATM fast switching board 20 includes a board mounting checking unit 21 for checking whether the clock transmitting board 10 is mounted from a board state checking unit 11 in the clock transmitting board 10; An internal clock unit 22 for generating an internal clock; When the board mounting confirmation unit 21 confirms that the clock transmission board 10 is mounted, the board mounting confirmation unit 21 receives a clock from the clock transmission unit 12 in the clock transmission board 10 and multiplexes it. A multiplexer 23 for receiving and multiplexing an internal clock from the internal clock unit 22 when it is confirmed that the clock transmission board 10 is not mounted; A fast matching serial and parallel converter 24 for performing fast matching serial and parallel conversion according to the clock multiplexed by the multiplexer 23; The ATM fast switching controller 25 is connected to the high speed matching serial and parallel converter 24 to control ATM fast switching.

The ATM switching board 30 includes a board mounting checking unit 31 for checking whether the clock transmitting board 10 is mounted from a board state checking unit 11 in the clock transmitting board 10; An internal clock receiver (32) for receiving an internal clock from the internal clock unit (22) in the ATM high speed switching board (20); When the board mounting confirmation unit 31 confirms that the clock transmission board 10 is mounted, the board mounting confirmation unit 31 receives and multiplexes a clock from the clock transmission unit 12 in the clock transmission board 10. A multiplexer 33 for receiving and multiplexing an internal clock from the internal clock receiver 32 when it is confirmed that the clock transmission board 10 is not mounted; A fast matching serial and parallel converter 34 for performing fast matching serial and parallel conversion according to the clock multiplexed by the multiplexing unit 33; The first and second ATM switching controllers 35 and 36 are connected to the high speed matching serial and parallel converter 34 to control ATM switching.

Referring to the operation of the prior art configured as described above in detail.

First, the ATM high speed switching board 20 and the ATM switching board 30 receive a clock from the clock transmission board 10 mounted on the back board and use the switching function.

At this time, if the clock transmission board 10 is removed, the internal clocks of the ATM high speed switching board 20 and the ATM switching board 30 are used for the switching function.

Therefore, the clock selection of the ATM fast switching board 20 and the ATM switching board 20 is performed by the following procedure.

That is, it is checked whether the clock transmission board 10 is mounted on the back board. The board state confirmation unit 11 in the clock transmission board 10 determines whether the clock transmission board 10 is mounted on the ATM high speed switching board 20 and the board mounting confirmation unit 21 of the ATM switching board 20 ( 31).

Thus, if the clock transmission board 10 is mounted, the ATM high speed switching board 20 and the ATM switching board 20 receive clocks from the clock transmission unit 12 of the clock transmission board 10 to perform a switching function. Done.

If the clock transmission board 10 is not mounted, the ATM fast switching board 20 and the ATM switching board 20 perform a switching function by using the internal clock generated by the internal clock unit 22. .

However, according to the related art, a clock may not be received even when a clock transmission board is mounted. At this time, the ATM switching function may be paralyzed due to a failure to switch to the internal clock receiving state, thereby making it reliable and reliable for customers. There was a problem that could not provide a service.

The present invention has been proposed to solve the above-mentioned problems, and the object of the present invention is to check the status of the clock as well as whether the clock transmission board is dismounted and the clock transmission board is mounted. It is to provide an asynchronous transmission switching device that can solve the problem that the function of the ATM switch is not paralyzed.

In order to achieve the above object, the asynchronous transmission switching device according to an embodiment of the present invention,

A clock transmission board for transmitting a clock; An ATM high speed switching board having an ATM high speed clock checking unit configured to check whether a clock necessary for ATM high speed switching can be received from the clock transmission board; Technical features of the present invention include an ATM switching board for performing ATM switching with an ATM clock check unit for checking whether a clock required for ATM switching can be received from the clock transmission board.

1 is a block diagram of a conventional asynchronous transfer switching device,

2 is a block diagram of a switching device of the asynchronous transmission method according to the present invention.

Explanation of symbols on the main parts of the drawings

10: clock transmission board 11: board status check unit

12: clock transmission unit 20: ATM high speed switching board

21: board mounting confirmation unit 22: internal clock unit

23: multiplexer 24: serial and parallel converter for high-speed matching

25: ATM high speed switching control unit 30: ATM switching board

31: board mounting check unit 32: internal clock receiving unit

33: multiplexer 34: serial and parallel converter for high-speed matching

35: first ATM switching controller 36: second ATM switching controller

40: ATM high speed clock check unit 50: ATM clock check unit

Hereinafter, an embodiment according to the technical idea of the present invention and the asynchronous transmission switching device configured as described above will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a switching device of the asynchronous transmission method according to the present invention.

As shown therein, a clock transmission board 10 for transmitting a clock; An ATM high speed switching board (20) having an ATM high speed clock checking unit (40) for checking whether a clock necessary for ATM high speed switching can be received from the clock transmission board (10); It comprises an ATM switching board 30 for performing ATM switching with an ATM clock check unit 50 that can determine whether the clock necessary for ATM switching from the clock transmission board 10 can be received.

In the above, the ATM high speed clock checking unit 40 checks whether a clock is received from the clock transmitting unit 12 in the clock transmitting board 10 and transmits the signal to the board mounting checking unit 21 in the ATM high speed switching board 20. In other words, when a clock is not received from the mounted clock transmission board 10, the ATM may be switched at high speed using an internal clock.

In the above, the ATM clock checking unit 50 confirms whether a clock is received from the clock transmitting unit 12 in the clock transmitting board 10 and informs the board mounting confirmation unit 31 in the ATM switching board 30. When the clock is not received from the mounted clock transmission board 10, ATM switching may be performed using an internal clock.

The operation of the asynchronous transmission switching device according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First of all, the present invention is intended to check the state of the clock as well as the presence or absence of a clock transmission board. Thus, if the clock state is not good, it can switch to receiving the internal clock.

Therefore, the clock transmission board 10 transmits a clock to the ATM high speed switching board 20 and the ATM switching board 30.

In addition, the board state checking unit 11 in the clock transmission board 10 checks whether the clock transmission board 10 is mounted on the back board, and informs the ATM high speed switching board 20 and the ATM switching board 30.

The clock transmitter 12 transmits a clock to the ATM high speed switching board 20 and the multiplexers 23 and 33 inside the ATM switching board 30, respectively. Then, the ATM high speed clock checker 40 and the ATM clock checker 50 check the state of the clocks transmitted from the clock transmitter 12 to the ATM high speed switching board 20 and the ATM switching board 30, respectively.

In addition, the ATM fast switching board 20 includes an ATM fast clock checking unit 40 that can check whether a clock necessary for ATM fast switching can be received from the clock transmission board 10 to perform ATM fast switching.

The ATM high speed clock checking unit 40 in the ATM high speed switching board 20 checks whether a clock is received from the clock transmitting unit 12 in the clock transmission board 10 and checks whether the board mounting unit of the ATM high speed switching board 20 is used. At 21, when the clock is not received from the mounted clock transmission board 10, it functions to enable ATM high-speed switching using the internal clock.

The board mounting confirmation unit 21 in the ATM high speed switching board 20 receives the mounting status of the clock transmission board 10 from the board state checking unit 11 of the clock transmission board 10. In addition, the ATM high-speed clock check unit 40 also checks whether the clock transmission unit 12 receives the normal transmission of the clock input to the multiplexer 23.

The internal clock unit 22 generates an internal clock. Therefore, even when the clock transmission board 10 is not mounted or the clock transmission board 10 is mounted, if the clock is not normally input from the clock transmission unit 12 to the multiplexer 23, an internal clock is generated to generate the multiplexer 23. In this case, ATM fast switching can be normally performed.

When the board mounting checker 21 confirms that the clock transmission board 10 is mounted, the multiplexer 23 receives a clock from the clock transmitter 12 of the clock transmission board 10 and multiplexes the board mounting checker ( If it is confirmed in 21 that the clock transmission board 10 is not mounted, the internal clock is received from the internal clock unit 22 and multiplexed. In addition, even when the clock transmission board 10 is mounted, if the clock is not normally input from the clock transmission unit 12, the internal clock is received from the internal clock unit 22 and multiplexed.

The fast matching serial and parallel converter 24 performs the fast matching serial and parallel conversion according to the clock multiplexed by the multiplexer 23.

The ATM fast switching controller 25 is connected to the fast matching serial and parallel converter 24 to control ATM fast switching.

In addition, the ATM switching board 30 is provided with an ATM clock check unit 50 for checking whether it is possible to receive a clock required for ATM switching from the clock transmission board 10 to perform ATM switching.

In the ATM switching board 30, the ATM clock checking unit 50 checks whether a clock is received from the clock transmitting unit 12 in the clock transmitting board 10, and then checks the board mounting confirmation unit 31 in the ATM switching board 30. If the clock is not received from the mounted clock transmission board 10, the internal clock functions to enable ATM switching.

The board mounting confirmation unit 31 in the ATM switching board 30 receives the mounting status of the clock transmission board 10 from the board state checking unit 11 of the clock transmission board 10. In addition, the ATM high-speed clock checker 40 also checks whether the clock transmitted from the clock transmitter 12 to the multiplexer 33 is normally transmitted.

The internal clock receiver 32 receives an internal clock from the internal clock unit 22 in the ATM high speed switching board 20. Therefore, even if the clock transmission board 10 is not mounted or the clock transmission board 10 is mounted, if the clock is not normally input from the clock transmission unit 12 to the multiplexer 33, the clock generated by the internal clock unit 23 is generated. By receiving the internal clock and transmitting it to the multiplexer 33, ATM switching can be normally performed.

When the board mount checking unit 31 confirms that the clock transmitting board 10 is mounted, the multiplexing unit 33 receives a clock from the clock transmitting unit 12 in the clock transmitting board 10 and multiplexes the board mounting checking unit ( If it is confirmed in 31 that the clock transmission board 10 is not mounted, the internal clock is received from the internal clock receiver 32 and multiplexed. In addition, even when the clock transmission board 10 is mounted, if the clock is not normally input from the clock transmission unit 12, the internal clock generated by the internal clock unit 22 is received through the internal clock receiver 32 and multiplexed.

The fast matching serial and parallel converter 34 performs the fast matching serial and parallel conversion according to the clock multiplexed by the multiplexer 33.

The first and second ATM switching controllers 35 and 36 are connected to the high speed matching serial and parallel converter 34 to control ATM switching.

Looking back at the operation of the present invention as a whole as follows.

First, check that the clock transmission board 10 is mounted on the back board.

Thus, if the clock transmission board 10 is mounted, the ATM high speed switching board 20 and the ATM switching board 20 receive clocks from the clock transmission unit 12 of the clock transmission board 10 to perform a switching function. Done.

If the clock transmission board 10 is not mounted, the ATM fast switching board 20 and the ATM switching board 20 perform a switching function by using the internal clock generated by the internal clock unit 22. .

In addition, the state of the clock received by the clock transmission board 10 is confirmed by the ATM high speed clock check unit 40 and the ATM clock check unit 50.

So if the clock condition is good, it performs ATM switching function with the received clock. However, if the clock condition is not good, the internal clock is used to perform ATM switching.

In this way, the present invention is to check the state of the clock as well as the hernia of the clock transmission board.

While the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the present invention as defined by the limitations of the following claims.

As described above, the switching device of the asynchronous transmission method according to the present invention can check the status of the clock as well as whether the clock transmission board is dismounted and the clock transmission board is mounted so that the clock does not come out so that the function of the ATM switch is reduced. This will solve the problem of paralysis.

Claims (3)

A clock transmission board 10 for transmitting a clock; An ATM high speed switching board (20) having an ATM high speed clock checking unit (40) for checking whether a clock necessary for ATM high speed switching can be received from the clock transmission board (10); And an ATM switching board 30 configured to perform ATM switching by including an ATM clock checking unit 50 for checking whether a clock necessary for ATM switching can be received from the clock transmission board 10. Asynchronous transmission switching device. The method of claim 1, wherein the ATM high speed clock check unit 40, Checks whether a clock is received from the clock transmission unit 12 in the clock transmission board 10, and informs the board mounting confirmation unit 21 in the ATM fast switching board 20, from the mounted clock transmission board 10. When the clock is not received, the switching device of the asynchronous transmission method characterized in that the high-speed switching to ATM using the internal clock. The method of claim 1, wherein the ATM clock check unit 50, It is confirmed whether a clock is received from the clock transmitter 12 in the clock transmitter board 10 and notified to the board mounting confirmation unit 31 in the ATM switching board 30, and the clock from the mounted clock transmitter board 10 is mounted. If not received, the switching device of the asynchronous transmission method characterized in that the switching to ATM using the internal clock.