JP3051095B2 - ATM switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM (Asynchronou).
s Transfer Mode). The present invention relates to a technique for expanding an ATM switch scale by combining a plurality of unit switch boards.

[0002]

2. Description of the Related Art ATM is a technique in which a wide variety of information is divided into short fixed-length blocks with headers called cells, and these blocks are multiplexed and transmitted as a unit. This is an advantage of conventional circuit switching and packet switching. , And can perform ultra-high-speed transmission, and can be applied to moving image transmission.

There is a cross point switch as one of the ATM switches. FIG. 5 shows a conceptual diagram of a 2 × 2 cross point switch. In FIG. 5, reference numerals 1-1 and 1
-2 is an input terminal, 2-1 and 2-2 are output terminals,
3 is a cross point, 4 is an address filter,
Reference numeral 5 denotes a unit switch board, and reference numeral 6 denotes a contention control unit. There are two input lines I1 and I2 and two output lines O1 and O2, and 2 × 2 cross points 3 are arranged in a matrix. Each cross point 3 has an address filter 4 for reading the destination information in the header of the cell transmitted from the input lines I1 and I2, and if the destination is the output line O1 or O2 connected to the cross point 3. For example, the cell is fetched and transmitted to the output line O1 or O2. The destination is cross point 3
If the output line O1 or O2 is not connected to the cell, the cell is not taken in.

Further, input lines I1 and I2 are coupled to two extended output lines EO1 and EO2, and two output lines O1 and O2 are coupled by competition control.
The extended input lines EI1 and EI2 are arranged. At this time, the contention control unit 6 performs contention control between cells transmitted from the address filters 4 of the input lines I1 and I2 and cells arriving from the extended input lines EI1 and EI2.

FIG. 6 is a diagram showing a configuration example of a cross point switch in which a plurality of cross point switches are combined. As described above, when the M × N cross point switch is mounted, if M and N are large, the switch board 1
Not all can be implemented on a sheet. Therefore, as shown in FIG. 6, the m × n cross point switches are used as unit switch boards 5, and they are further expanded in a matrix to mount M × N cross point switches. The unit switch boards are arranged in a matrix of M / m rows and N / n columns.

[0006]

When the scale of an ATM switch is expanded by the configuration shown in FIG. 6, the area in which unit switch boards are arranged becomes larger as the scale of the switch becomes larger. FIG. 7 is a diagram showing the concept of a conventional extended ATM switch. In FIG. 7, the unit switch boards 5-A to 5-D are configured by combining four unit switch boards 5 illustrated in FIG. 5, and the configuration is further combined.

Reference numeral 6 denotes a common unit for supplying clock distribution and power, and reference numerals 7-A to 7-D denote controllers for controlling the unit switch boards 5-A to 5-D, respectively.

In such a configuration, the expandability is high, but a large space is required in the central portion for clock distribution and power supply, and eventually the size of the entire device becomes large.

The present invention has been made in view of such a background, and an object of the present invention is to provide an ATM switch and an extended ATM switch capable of reducing the size of the entire device even if the switch scale is increased. Aim. SUMMARY OF THE INVENTION It is an object of the present invention to provide an ATM switch and an extended ATM switch that can easily supply power, cool, supply a clock, etc. even if the switch scale becomes large. SUMMARY OF THE INVENTION An object of the present invention is to provide an ATM switch and an extended ATM switch capable of expanding a switch scale with the same topology.

[0010]

According to the present invention, for example, one unit switch board formed on a printed circuit board is radially arranged, expanded only by connecting between adjacent unit switches, and the center of the radial pattern is expanded. The most important feature is to arrange circuits (for example, clock distribution and power distribution) that are commonly required for the units.

Thus, even if the switch scale is increased, the size of the entire device can be reduced, and power supply, cooling, clock supply, and the like can be easily performed. Further, the switch scale can be expanded with the same topology.

That is, a first aspect of the present invention is an ATM switch, which is characterized by m input lines, n output lines, and cells arriving at the input lines. A plurality of unit switch boards each including switching connection means for distributing to output lines, each of which is formed in the shape of a quadrilateral plate; Are arranged on one side (hereinafter referred to as “side a”), and m extended output lines obtained by branching the m input lines are arranged on opposite sides (hereinafter referred to as “b side”) of the quadrilateral. The n output lines are adjacent to the one side (hereinafter referred to as “side c”).
On the side opposite to the adjacent side (hereinafter referred to as “d side”), n extended input lines coupled to the n output lines by competition control are arranged. (A, B, C, D) are arranged such that one quadrilateral space is provided on one plane and the sides a and b are opposed to each other, and the extended output line of the unit switch board A is connected to the unit switch. Connected to the input line of the board B, the extended output line of the unit switch board C is connected to the input line of the unit switch board D, and the output line of the unit switch board A is connected to the extended input line of the unit switch board C. Output line of switch board B is unit switch board D
Is connected to the extension input line.

It is preferable that a circuit common to the plurality of unit switch boards is provided in the quadrilateral space. The common circuit can be a power supply or a clock distribution device. Furthermore,
The cooling device may be common to the plurality of unit switch boards. Further, all of these circuits and devices may be provided in the quadrilateral space.

A second aspect of the present invention is an extended ATM switch. A feature of the present invention is that the ATM switch has one side on which m × 4 input lines are arranged as “p”.
M × 4 where m × 4 input lines are branched
The opposite side where the extended output lines are arranged is referred to as “q side”,
When n × 4 output lines are arranged and the side adjacent to the one side is “r side”, and n × 4 extended input lines are arranged and the other side adjacent to the one side is “s side”, The ATM
Four switches (P, Q, R, S) are provided with one quadrilateral space on one plane, and the p side and the q side are arranged to face each other. The extended output line is connected to the input line of the ATM switch Q,
The extended output line of the TM switch R is connected to the input line of the ATM switch S, and the output line of the ATM switch P is connected to the AT switch.
It is connected to the extended input line of the M switch R, and the output line of the ATM switch Q is connected to the extended input line of the ATM switch S.

In the quadrilateral space, a plurality of ATMs are provided.
It is desirable that a common circuit be provided for the switches. The common circuit can be a power supply or a clock distribution device. Furthermore, a cooling device common to a plurality of the unit switch boards may be used. Further, all of these circuits and devices may be provided in the quadrilateral space.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1, 3 and 4. FIG. FIG. 1 is a conceptual diagram showing the configuration of the ATM switch according to the first embodiment of the present invention. FIG. 3 is a conceptual diagram showing a configuration of an ATM switch which is a unit constituting an extended ATM switch according to a second embodiment of the present invention. FIG. 4 is a conceptual diagram showing the configuration of an extended ATM switch according to the second embodiment of the present invention.

The first embodiment of the present invention is an ATM switch, which is characterized by input lines AI, BI, CI, DI, and output lines as shown in FIG. Line A-
O, BO, CO, DO, and input lines AI,
A unit including a unit switch board 5 which is an exchange connection means for distributing cells arriving at BI, CI, and DI to desired output lines AO, BO, CO, and DO. Switch boards 5-A, 5-B, 5-C and 5-D are provided, and the unit switch boards 5-A, 5-B, 5-C and 5-D are provided.
Are formed in a quadrilateral plate shape, and the unit switch boards 5-A, 5-B, 5-C and 5-D are connected to the input line A-
I, BI, CI, and DI are arranged on the side a of the quadrilateral, and the input line A- is connected to the side b that is the opposite side of the quadrilateral.
Extended output lines A-EO, B-EO, C-EO, and D-EO from which I, BI, CI, and DI are branched;
The output lines A-O, B-O, C-O, and D-O are arranged on the side c adjacent to the side a, and the output lines A-O, B- on the side d opposite to the side c. Extended input lines A-EI, B-EI, which are coupled to O, CO, DO by contention control;
C-EI and D-EI are arranged, and the unit switch board 5
-A, 5-B, 5-C and 5-D are arranged such that one quadrilateral space is provided on one plane and the sides a and b are opposed to each other. -A is connected to the input line BI of the unit switch board 5-B, and the extended output line C-EO of the unit switch board 5-C is connected to the input line D of the unit switch board 5-D. -I, the output line A-O of the unit switch board 5-A is connected to the extended input line C of the unit switch board 5-C.
-EI, and the output line BO of the unit switch board 5-B is connected to the extended input line D of the unit switch board 5-D.
-Connected to EI.

In the quadrilateral space, a common unit 6 which is a circuit common to the unit switch boards 5-A to 5-D is provided.
Is provided. The common unit 6 includes a power supply device, a clock distribution device, and a cooling device.

The second embodiment of the present invention is an extended ATM switch. An extended ATM switch is constructed by combining four ATM switches of the first embodiment of the present invention. Therefore,
M input lines of the ATM switch of the first embodiment of the present invention,
Assuming that the number of output lines is n, the input line of the extended ATM switch according to the second embodiment of the present invention is m × 4, and the output line is n.
× 4. In FIGS. 3 and 4, a line is represented by one solid line, but it is assumed that an input line includes m × 4 lines and an output line includes n × 4 lines.

As a feature, as shown in FIG. 3, the unit switch boards 5-A, 5-B, 5-C and 5-D constituting the ATM switch of the first embodiment of the present invention have input terminals. One side on which the lines AI and CI are arranged is called “p side”
And an extended output line D-EO from which the input line is branched.
Is defined as “q side”, the side adjacent to the p side on which the output lines CO and DO are arranged is defined as “r side”, and the extended input lines A-EI and B-EI are arrayed. Then p
When the other side adjacent to the side is defined as “s side”, A shown in FIG.
The four TM switches P, Q, R, and S provide one quadrilateral space on one plane, and are arranged so that the p side and the q side face each other. The output line P-EO is the input line QI of the ATM switch Q.
And the extended output line R-EO of the ATM switch R
Is connected to the input line SI of the ATM switch S,
The output line PO of the M switch P is connected to the extended input line R-EI of the ATM switch R, and the output line QO of the ATM switch Q is connected to the extended input line SE of the ATM switch S.
I connected to

A common unit 6 which is a circuit common to the ATM switches P, Q, R and S is provided in the quadrilateral space. The common unit 6 includes a power supply device, a clock distribution device, and a cooling device.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is an equivalent circuit of the ATM switch according to the first embodiment of the present invention shown in FIG. Each of the unit switch boards 5-A to 5-D is implemented as an LSI.
A feature of the present invention is that a combination of the unit switch boards 5-A, 5-B, 5-C, and 5-D configured as shown in FIG. 2 is centered on the common unit 6 as shown in FIG. It is characterized by being provided in a section and being arranged radially around the section. In addition, each unit switch board 5-
Controllers 7-A, 7 for A, 5-B, 5-C, 5-D
-B, 7-C, and 7-D are arranged at an arbitrary periphery.

By arranging the common unit 6 in the center as described above, it is possible to efficiently supply a clock and power and reduce the overall system size.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows a unit switch board 5 constituting an ATM switch according to the first embodiment of the present invention.
In the combination of A, 5-B, 5-C, 5-D, input line I, output line O, extended input line EI, extended output line E
O is provided. Each of these ATM switches P,
Q, R, and S are defined as one unit, and each unit switch board 5-A, 5-B, 5-C, 5-
The ATM switch P,
Extended AT applied to Q, R, and S connections as shown in FIG.
Configure the M switch. However, the number of connected lines increases as the switch scale increases.

As described above, even when the extended ATM switch is configured, by disposing the common unit 6 at the center,
Clock and power can be efficiently supplied, and the overall system size can be reduced.

[0026]

As described above, according to the present invention,
Even if the switch scale becomes large, the size of the entire device can be reduced, and power supply, cooling, clock supply, and the like can be easily performed. Further, the switch scale can be expanded with the same topology.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the configuration of an ATM switch according to a first embodiment of the present invention.

FIG. 2 is an equivalent circuit of the ATM switch according to the first embodiment of the present invention.

FIG. 3 is a conceptual diagram showing a configuration of an ATM switch which is a unit constituting an extended ATM switch according to a second embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a configuration of an extended ATM switch according to a second embodiment of the present invention.

FIG. 5 is a conceptual diagram of a 2 × 2 cross point switch.

FIG. 6 is a diagram showing a configuration example of a cross point switch in which a plurality of cross point switches are combined.

FIG. 7 is a diagram showing the concept of a conventional extended ATM switch.

[Description of Signs] 1-1, 1-2, 1-3, 1-4 Input terminal 2-1 2-2, 2-3, 2-4 Output terminal 3 Cross point 4 Address filter 6 Competition control unit I1 , I2, I10, I20, AI, BI, C-
I, DI, PI, QI, RI, SI input lines O1, O2, O10, O20, AO, BO, C-
O, DO, PO, QO, RO, SO Output lines A-EI, B-EI, C-EI, D-EI, P-EI,
Q-EI, R-EI, S-EI Extended input line A-EO, B-EO, C-EO, D-EO, P-EO,
Q-EO, R-EO, S-EO Extended output line 5, 5-A, 5-B, 5-C, 5-D Unit switch board P, Q, R, S ATM switch

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Yasukawa 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 12/28 H04L 12/56 H04L 12/10

Claims (10)

(57) [Claims] 1. m input lines, n output lines,
A plurality of unit switch boards including switching connection means for distributing cells arriving at the input line to a desired output line, each of which is formed in a quadrilateral plate shape; The m input lines are arranged on one side of the quadrilateral (hereinafter referred to as “side a”), and the m input lines are branched to opposing sides of the quadrilateral (hereinafter referred to as “b side”). Extended output lines are arranged, and the n output lines are connected to a side adjacent to the one side (hereinafter, “c”).
Side), and n extended input lines coupled to the n output lines by competition control are arranged on the side opposite to the adjacent side (hereinafter referred to as “d side”). Four switchboards (A, B, C, D) are arranged so that one quadrilateral space is provided on one plane and sides a and b are opposed to each other. The line is connected to the input line of the unit switch board B, the extended output line of the unit switch board C is connected to the input line of the unit switch board D, and the output line of the unit switch board A is connected to the extended input line of the unit switch board C. An ATM switch wherein the output line of the unit switch board B is connected to the extended input line of the unit switch board D. 2. The ATM switch according to claim 1, wherein a circuit common to the plurality of unit switch boards is provided in the quadrilateral space. 3. The ATM switch according to claim 2, wherein said common circuit is a power supply device. 4. The ATM switch according to claim 2, wherein said common circuit is a clock distribution device. 5. A cooling device common to a plurality of said unit switch boards is provided in said quadrilateral space.
The ATM switch as described. 6. The ATM switch according to claim 1, wherein m.times.
One side where the four input lines are arranged is referred to as “p side”, and the opposite side where the m × 4 extended output lines into which the m × 4 input lines are branched is referred to as “q side”. A side on which n × 4 output lines are arranged and which is adjacent to the one side is referred to as “r side”,
When n × 4 extended input lines are arranged and the other side adjacent to the one side is referred to as “s side”, four (P, Q, R, S) of the ATM switches are arranged in one plane on one plane. A quadrilateral space is provided so that the p side and the q side are opposed to each other. An extended output line of the ATM switch P is connected to an input line of the ATM switch Q, and an extended output line of the ATM switch R is provided. Is connected to the input line of the ATM switch S, and the ATM
An extended ATM switch, wherein an output line of the switch P is connected to an extended input line of the ATM switch R, and an output line of the ATM switch Q is connected to an extended input line of the ATM switch S. 7. The plurality of ATs in the quadrilateral space.
7. The extended ATM switch according to claim 6, wherein a circuit common to the M switches is provided. 8. The extended ATM switch according to claim 7, wherein said common circuit is a power supply device. 9. The extended ATM switch according to claim 7, wherein said common circuit is a clock distribution device. 10. The plurality of A
7. The extended ATM switch according to claim 6, wherein a common cooling device is provided for the TM switch.