JP2017117837A - Communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication apparatus capable of efficiently cooling a heating element.SOLUTION: The communication apparatus comprises: a substrate 51; multiple arrangement parts 63 which are provided while being spaced apart from each other on a wall body 61 provided on one side 52 of the substrate 51, the arrangement parts being a region on the wall body 61 in which a connection part 62 to be used for communications with the outside is disposed; a control part 81 which is disposed in the substrate 51 and controls communications with the outside via the connection part 62; and multiple ventilation parts 65A and 65B which are provided between the multiple arrangement parts 63 on the wall body 61, each of the ventilation parts including an opening through which air flows in or out between the outside and the inside of the wall body 61. A total opening area of the ventilation part 65A in a region closer to the control part 81 is larger than a total opening area of the ventilation part 65B in a region away therefrom.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a communication device.

  For example, a communication device constituting a communication network includes a housing, a substrate on which electronic components such as an IC (integrated circuit) are arranged, a fan unit used for cooling the electronic components, and power to the electronic components and the fan unit. The power supply unit etc. which supply are provided (refer patent document 1). A plurality of ports to which an external module such as an optical transceiver used for communication with the outside is connected and a vent hole used for cooling an electronic component or the like are provided on the front surface of the housing.

  As the fan of the fan unit rotates, air is sucked from the outside to the inside of the housing through the vent hole. The flowing air cools heating elements such as optical transceivers inserted into the ports and electronic components on the board (for example, switch LSI (switch large scale integrated circuit)).

JP 2013-183136 A

  The number of ports per communication device tends to increase in order to cope with the increase in traffic flowing through communication networks in recent years. Since there is a limit to the increase in the size of the housing of the communication device, it is difficult to secure the arrangement area of the vent holes provided on the front surface of the housing together with the port, and the tendency is to decrease.

  On the other hand, as the communication speed in the communication network increases, the amount of heat generated by the optical transceiver used for communication, the electronic components on the board, and the like tends to increase. In order to cope with an increase in the amount of heat generated, it is required to secure a flow rate of air used for cooling an optical transceiver or the like.

  However, there is a problem that it is difficult to secure the flow rate of the air used for cooling in the tendency that the arrangement area of the ventilation holes is reduced, and it is difficult to cool the heating elements such as the optical transceiver and the electronic parts on the board. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a communication device that can efficiently cool a heating element.

  In order to achieve the above object, the present invention provides an area in which a connection portion used for communication between a board and a wall provided on one side of the board is used for communication with the outside. Air flows between the outer side and the inner side of the wall body, a plurality of arrangement units provided at intervals, a control unit arranged on the substrate and controlling communication with the outside through the connection unit Or a ventilation portion having an opening to flow out, and a plurality of ventilation portions provided between the plurality of arrangement portions in the wall body, and an opening area of the ventilation portion in a region close to the control portion Provides a communication device that is greater than the sum of the open areas of the vents in the distant regions.

  According to the communication device of the present invention, it is easy to secure the flow rate of air used for cooling by flowing from the outside of the substrate in a region closer to the control unit than in a region far from the control unit. Since it is easy to secure the flow rate of the cooling air flowing around the control unit, there is an effect that the control unit is easily cooled efficiently. Furthermore, since a ventilation part is provided between the arrangement parts, cooling air flows around the connection part. Therefore, the effect that it becomes easy to cool a connection part efficiently is produced.

It is a front view explaining the structure of the Ethernet switch regarding the 1st Embodiment of this invention. It is a rear view explaining the structure of the Ethernet switch of FIG. FIG. 2 is a cross-sectional view for explaining the flow of wind in the housing of the Ethernet switch of FIG. 1. It is a top view explaining the structure of the line card of FIG. It is a front view explaining the structure of the line card of FIG. It is a top view explaining the arrangement position of the communication LSI in the line card of FIG. It is a front view explaining the structure of the line card regarding the 2nd Embodiment of this invention. It is a sectional view explaining the flow of the wind of the line card of FIG.

[First Embodiment]
Hereinafter, a switch (hereinafter referred to as an “Ethernet switch”) and a line card used in the Ethernet (registered trademark) according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

  In this embodiment, the Ethernet switch 10 accommodates a total of ten line cards (communication devices) 50 as shown in FIG. 1, and controls these line cards 50 so as to cooperate with each other. Apply and explain. The number of line cards 50 that can be accommodated in the Ethernet switch 10 may be more than ten or less than ten.

  As shown in FIGS. 1 and 2, the Ethernet switch 10 includes a housing 11 formed in a substantially rectangular parallelepiped shape that accommodates the line card 50. The housing 11 includes a front wall 12 constituting the front surface, a rear wall 13 constituting the rear surface, a pair of side walls 14 constituting the left and right surfaces, a top wall 15 constituting the upper surface, and a bottom wall constituting the lower surface. 16.

  As shown in FIG. 1, an insertion opening 21, which is an opening through which the line card 50 is inserted / removed when the line card 50 is accommodated in the housing 11, is provided at a portion of the front wall 12 near the top wall 15. Is provided. In the present embodiment, a total of ten line cards 50 are inserted vertically into the insertion opening 21 and the insertion opening 21 is blocked by the inserted line card 50.

  Here, description will be made by applying to an example in which the insertion opening 21 is provided in the most area of the front wall 12, but the insertion opening depends on the number of line cards 50 to be inserted or the design of the housing 11. The area occupied by 21 on the front wall 12 may be larger or smaller.

  A guide rail (not shown) for guiding the insertion and removal of the line card 50 is provided inside the insertion opening 21 in the housing 11. This guide rail is a rail extending from the front wall 12 toward the back wall 13 and is provided in a region on the top wall 15 side and a region on the bottom wall 16 side. The guide rail holds the line card 50 inserted in a vertical state, in other words, the line card 50 extends from the bottom wall 16 toward the top wall 15 when viewed from the front wall 12 side. Further, the guide rail holds the line card 50 so that the line card 50 can be inserted and removed, and can suppress the line card 50 from being rolled when inserted into the insertion opening 21.

  An intake port 22 is provided in a portion of the front wall 12 near the bottom wall 16. The air inlet 22 is an aggregate of innumerable hexagonal small holes, and is formed in a substantially mesh shape. A hole in the air inlet 22 communicates the inside and outside of the housing 11, and cooling air WE (see FIG. 3) can be introduced into the housing 11. In FIG. 1, some of the holes that form the air inlets 22 are omitted for easy understanding.

  A pair of management cards 23 (not shown in detail) are provided in a portion of the front wall 12 closer to the bottom wall 16 than the air inlet 22. The management card 23 is a functional component for controlling and managing a plurality of line cards 50 housed in the housing 11, a large fan 25 described later, a power supply 26, and the like. The pair of management cards 23 is the same for both. Even if one of the management cards 23 breaks down, the other management card 23 functions so that the control and management of the power supply 26 and the like can be continued. As a result, it is possible to reduce the probability of occurrence of problems such as communication stoppage. In other words, the Ethernet switch 10 can have a fail-safe function.

  As shown in FIG. 2, a portion of the back wall 13 near the top wall 15 includes an exhaust port 24 that is an opening through which the cooling air WE introduced into the housing 11 is exhausted to the outside of the housing 11. A large fan 25 is provided for flowing the cooling air WE. The exhaust port 24 is provided with a total of ten large fans 25 through which the cooling air WE for cooling the line card 50 flows. The large fans 25 are arranged such that five rows arranged in the horizontal direction so as to cover the opening of the exhaust port 24 are arranged in two rows vertically.

  In the present embodiment, description will be made by applying to an example in which the cooling air WE flows when the blades provided in the large fan 25 are rotationally driven. The cooling air WE is sucked into the housing 11 from the air inlet 22, flows in the housing 11 from the air inlet 22 toward the exhaust port 24, and is discharged from the housing 11 through the air outlet 24. Apply and explain.

  A pair of power sources 26 (not shown in detail) are provided on the back wall 13 near the bottom wall 16. The power source 26 supplies drive current to a main board 27 (see FIG. 3), a large fan 25, a management card 23, and the like provided near the back wall 13 inside the housing 11. The pair of power sources 26 is the same for both. Even if one of the power sources 26 breaks down, the other power source 26 functions so that the drive current can be continuously supplied.

  As shown in FIG. 4, the line card 50 that is a signal transmission device includes a substantially rectangular substrate 51 having printed wiring (not shown) formed on the front surface and the back surface. In the present embodiment, the substrate 51 will be described as applied to an example in which a glass fiber cloth is laminated and impregnated with an epoxy resin. Further, the description will be made by applying to an example in which the substrate 51 is formed in a substantially square shape, but the substrate 51 may be formed in a substantially rectangular shape, and the shape is not particularly limited.

  Here, in a state where the line card 50 is accommodated in the housing 11, among the four sides of the substrate 51, the one located on the front wall 12 side of the housing 11 is referred to as a front side portion (one side) 52. To do. Similarly, the thing located in the back wall 13 side of the housing | casing 11 is made into the back side part 53, and the thing located in the top wall 15 side of the housing | casing 11 is made into the top wall side part 54, and the bottom wall of the housing | casing 11 is used. The one located on the 16th side is the bottom wall side portion 55.

  An interface unit (wall body) 61 is provided on the front side portion 52. The interface unit 61 is a plate-like member that rises up from the substrate 51 and constitutes a part of the front wall 12 of the housing 11 in a state where the line card 50 is accommodated in the housing 11. As shown in FIG. 5, the interface unit 61 is an area where a plurality of photoelectric converters (connection parts) 62 are arranged, and an area where a plurality of hexagonal openings (openings) 64 are provided. A first ventilation portion 65A and a second ventilation portion 65B, and a third ventilation portion 67, which is a region where a plurality of rectangular openings 66 are provided, are provided.

  The arrangement portion 63 has a row in which five photoelectric converters 62 are arranged along the substrate 51 in a rectangular region, and two rows are arranged on the side close to and away from the substrate 51. . Further, four arrangement parts 63 are arranged along the substrate 51 at intervals in the interface unit 61.

  In addition, arrangement units 63 having different communication speeds corresponding to the left and right of the first ventilation unit 65A are arranged. That is, the communication speed corresponding to the arrangement part 63 arranged on the right side (bottom wall side part 55 side) of the first ventilation part 65A and the arrangement part 63 arranged on the left side (top wall side part 54). Are different.

  Specifically, the photoelectric converter 62 connected to the arrangement unit 63 is connected to a pin corresponding to a predetermined communication speed and signal processing speed in the communication LSI 81 so that electric signals can be input and output. The arrangement part 63 arranged on the right side of the first ventilation part 65A and the arrangement part 63 arranged on the left side have different pins of the communication LSI 81 to be connected and have different values such as corresponding communication speeds.

  The first ventilation part 65 </ b> A and the second ventilation part 65 </ b> B are formed by forming a plurality of hexagonal openings 64 in a region sandwiched between four arrangement parts 63 in the interface unit 61. 65 A of 1st ventilation parts are formed in the center area | region among the three area | regions pinched | interposed into the four arrangement | positioning parts 63. FIG. The second ventilation portion 65B is formed in each of the two outer regions among the three regions sandwiched.

  In the present embodiment, the region where the first ventilation portion 65A is provided is wider than the region where the second ventilation portion 65B is provided. Specifically, the interval between the adjacent arrangement portions 63 in the region where the first ventilation portion 65A is provided is wider than the interval between the second ventilation portions 65B. Furthermore, the number of hexagonal openings 64 formed in the region of the first ventilation part 65A is larger than the number of the second ventilation parts 65B, and the total opening area of the hexagonal openings 64 is also large.

  The interval between the arrangement parts 63 adjacent to the first ventilation part 65A is such that the total opening area of the hexagonal openings 64 formed in the region of the first ventilation part 65A is the total opening area of the second ventilation part 65B. If it is larger than the value, it may not be wider than the interval in the second ventilation part 65B.

  The number of hexagonal openings 64 formed in the region of the first ventilation part 65A is the sum of the opening areas of the hexagonal openings 64 formed in the area of the first ventilation part 65A. As long as it is larger than the total value in 65B, it may not be larger than the number in the 2nd ventilation part 65B. Furthermore, the shape of the hexagonal opening 64 formed in the region of the first ventilation part 65A and the second ventilation part 65B may be a hexagonal shape, or may be any other shape, and is not particularly limited. Absent.

  The third ventilation part 67 has a plurality of rectangular openings 66 formed in a region farther from the substrate 51 than the arrangement part 63 in the interface unit 61. In the present embodiment, description will be made by applying to an example in which a plurality of rectangular openings 66 are provided in a line in a region between the end portion of the interface unit 61 and the arrangement portion 63.

  The photoelectric converter 62 is connected to an optical fiber cable (not shown), and converts an optical signal into an electric signal and an electric signal into an optical signal. In the present embodiment, description will be made by applying to an example in which the photoelectric converter 62 is an optical transceiver, for example. The photoelectric converter 62 that is an optical transceiver can be inserted into and removed from the placement unit 63. The photoelectric converter 62 converts an optical signal from the optical fiber cable into an electrical signal and sends the electrical signal to a communication LSI 81 to be described later, or converts the input electrical signal into an optical signal and converts the optical signal into an optical fiber. The cable is sent out.

  In the present embodiment, the connection unit described in the claims is applied to an example of the photoelectric converter 62 that converts an optical signal into an electrical signal. However, the connection unit converts the optical signal into an electrical signal. It does not have to be converted. For example, in the case of short-distance communication, a so-called direct attach cable that has connectors at both ends of the cable and transmits electrical signals can be used.

  In the present embodiment, since four arrangement portions 63 in which ten photoelectric converters 62 are arranged are provided in the interface unit 61, a total of 40 photoelectric converters 62 are provided. That is, in the present embodiment, description will be made by applying to an example in which the line card 50 is a 40-port Ethernet line card.

  As shown in FIGS. 4 and 6, the rear side portion 53 is provided with a connector 71 connected to a slot of the main board 27 (see FIG. 3). The connector 71 includes a connector body 72 having a substantially rectangular parallelepiped shape extending along the end of the back side portion 53, and a connector connecting portion projecting from the connector body 72 toward the main board 27 side (right side in the figure). 73.

  The connector connecting portion 73 is inserted into the slot of the main board 27 when the line card 50 is inserted into the housing 11 along the guide rail. The connector connection unit 73 is connected to the communication LSI 81 of the line card 50 so as to be able to communicate electrical signals and supply drive current. Further, the connector connecting portion 73 inserted into the slot of the main board 27 is connected to the main board 27 so as to be able to communicate electrical signals and supply drive current.

  As shown in FIGS. 4 and 6, a communication LSI (control unit) 81 that processes an electrical signal that is a high-speed signal used for communication and a communication LSI heat sink 82 are arranged on the substrate 51. The communication LSI 81 performs control to send the signal to the photoelectric converter 62 connected to the communication destination based on the destination (communication destination) information included in the received signal (communication information). The communication LSI 81 is disposed in a substantially central region, which is a region overlapping with the first ventilation portion 65 </ b> A, as viewed from the interface unit 61 side, and is disposed in a region near the back side portion 53.

  Further, the communication LSI 81 is a heat generating element that generates heat when processing an electrical signal, and is very hot during operation to process a high-speed signal. The communication LSI heat sink 82 is disposed with the communication LSI 81 between the substrate 51 and the heat generated by the communication LSI 81 is dissipated.

  The substrate 51 is further provided with a first heat generating element 83, a second heat generating element 84, and a third heat generating element 85 which are controllers (CPU) for controlling the line card 50. Each of the first heat generating element 83, the second heat generating element 84, and the third heat generating element 85 is provided with a heat sink that dissipates heat generated in each element. Since the amount of heat generated in the first heat generating element 83, the second heat generating element 84, and the third heat generating element 85 is less than the amount of heat generated in the communication LSI 81, these heat sinks are smaller than the heat sink 82 for communication LSI. It is said that.

  Note that the heat sink provided in the communication LSI heat sink 82, the first heat generating element 83, the second heat generating element 84, and the third heat generating element 85 is made of a metal material such as aluminum or aluminum alloy having excellent thermal conductivity. And formed using a known method such as casting or cutting.

  Next, how the cooling air WE flows in the Ethernet switch 10 and the line card 50 configured as described above and how the cooling air WL flows in the line card 50 will be described. First, how the cooling air WE flows from the intake port 22 of the housing 11 will be described. Next, how the cooling air WL flows from the first ventilation part 65A, the second ventilation part 65B, and the third ventilation part 67 of the line card 50 will be described.

  When the large fan 25 is driven to rotate, air outside the housing 11 is introduced into the housing 11 through the air inlet 22 as shown in FIG. The temperature of the outside air is lower than that of the air inside the casing 11 of the Ethernet switch 10 in which the line card 50 that generates heat is housed. The air introduced into the inside of the housing 11 will be described as cooling air WE.

  The cooling air WE passes through the inside of the housing 11 from the intake port 22 provided near the bottom wall 16 of the front wall 12 and the exhaust port 24 provided near the top wall 15 of the back wall 13. It flows along the first flow path FP1 that draws a substantially S-shape. The first flow path FP <b> 1 is partially formed on the substrate 51 constituting the line card 50.

  On the other hand, when the large fan 25 is driven to rotate, air outside the housing 11 is introduced into the line card 50 through the first ventilation portion 65A, the second ventilation portion 65B, and the third ventilation portion 67. The The air introduced into the line card 50 will be described as cooling air WL.

  The cooling air WL passes from the first ventilation portion 65A, the second ventilation portion 65B, and the third ventilation portion 67 provided in the interface unit 61 to the exhaust port 24 via the substrate 51. Flowing along. Here, since the total value of the opening area of the hexagonal opening 64 is larger in the first ventilation part 65A than in the second ventilation part 65B, the air volume of the cooling air WL introduced through the first ventilation part 65A is It becomes larger than the air volume of the cooling air WL introduced through the second ventilation part 65B.

  When viewed from the interface unit 61 side, the cooling air WL introduced via the first ventilation portion 65A tends to flow in and around the communication LSI 81 arranged in the region overlapping with the first ventilation portion 65A. For this reason, the flow rate of the cooling air WL flowing in the communication LSI 81 and the vicinity thereof tends to be larger than the flow rate of the cooling air WL flowing in other regions.

  The cooling air WL flowing in the communication LSI 81 and the vicinity thereof cools the communication LSI 81 by contacting the heat sink 82 for communication LSI and removing heat. That is, the heat generated in the communication LSI 81 moves to the cooling air WL through the communication LSI heat sink 82. When the flow rate of the cooling air WL is large, the amount of heat of the communication LSI 81 that moves to the cooling air WL via the communication LSI heat sink 82 increases, so that the cooling performance increases.

  According to the line card 50 having the above-described configuration, the cooling air WL that flows from the outside of the substrate 51 and is used for cooling in the first ventilation portion 65A that is closer to the communication LSI 81 than the second ventilation portion 65B that is far from the communication LSI 81. It is easy to secure the flow rate. Since it is easy to secure the flow rate of the cooling air WL flowing in the communication LSI 81 and the vicinity thereof, the communication LSI 81 can be efficiently cooled.

  Furthermore, since the first ventilation part 65 </ b> A and the second ventilation part 65 </ b> B are provided between the arrangement parts 63, the cooling air WL flows around the photoelectric converters 62 arranged in the arrangement part 63. Therefore, it becomes easy to cool the photoelectric converter 62 efficiently.

  By making the total opening area of the first ventilation part 65A closest to the communication LSI 81 larger than the total opening area of the second ventilation part 65B, it is easy to secure the flow rate of the cooling air WL flowing in the communication LSI 81 and its vicinity. Become.

  When viewed from the interface unit 61 side, in other words, when viewed from the flow direction of the cooling air WL, the communication LSI 81 is arranged in the center of the substrate 51, so that it is easy to secure a space for cooling air to flow around the communication LSI 81. .

  Furthermore, by disposing the communication LSI 81 in the center of the substrate 51, it is easy to suppress a deviation in the distance between the communication LSI 81 and each photoelectric converter 62 disposed in the disposition unit 63. Therefore, for example, it is possible to suppress an increase in the wiring distance from the communication LSI 81 to the farthest photoelectric converter 62, and it is easy to suppress transmission loss.

  An electronic component arranged near the first ventilation portion 65A is a communication LSI 81, in other words, an electronic component that generates a large amount of heat among the electronic components provided in the line card 50, so that the cooling air WL that is cooling air is reduced. It becomes easy to improve the cooling effect by securing the air volume.

Since the communication speed that can be accommodated by the placement unit 63 is different between the left and right sides of the first ventilation portion 65A, it is possible to prevent the photoelectric converter 62 that does not correspond to the communication rate from being inserted into the placement unit 63 by mistake. That is, since the first ventilation portions 65A are arranged between the corresponding arrangement portions 63 having different communication speeds, the photoelectric converter is compared with the case where the arrangement portions 63 having different communication speeds are adjacent to each other. It becomes difficult to insert 62 into the arrangement | positioning part 63 with which communication speed does not respond | correspond.
[Second Embodiment]
Next, an Ethernet switch and a line card according to the second embodiment of the present invention will be described with reference to FIG. The basic configuration of the Ethernet switch and the line card of this embodiment is the same as that of the first embodiment, but the configuration of the interface unit in the line card is different from that of the first embodiment. Therefore, in the present embodiment, only the periphery of the interface unit will be described with reference to FIG. 7, and description of other components and the like will be omitted.

  As shown in FIG. 7, the interface unit 61 in the line card 50 of the present embodiment includes a first arrangement unit (arrangement unit) 63 </ b> A and a second arrangement unit (arrangement), which are regions where a plurality of photoelectric converters 62 are arranged. Part) 63B and third arrangement part (arrangement part) 63C, a ventilation part 65, which is a region where a plurality of hexagonal openings 64 are provided, and a third ventilation part 67.

  The first arrangement portion 63A has a row in which two photoelectric converters 62 are arranged along the substrate 51 in a rectangular area, and the two rows are arranged on the side close to and away from the substrate 51. It is. The second arrangement part 63B has a row in which four photoelectric converters 62 are arranged along the substrate 51 in a rectangular region, and two rows are arranged on the side close to and away from the substrate 51. It is. The third arrangement portion 63C has a row in which five photoelectric converters 62 are arranged along the substrate 51 in a rectangular region, and two rows are arranged on the side close to and away from the substrate 51. It is.

  The first placement unit 63 </ b> A, the second placement unit 63 </ b> B, and the third placement unit 63 </ b> C are arranged in a line along the substrate 51. More specifically, one first arrangement portion 63A is arranged in the center, two second arrangement portions 63B are arranged with the first arrangement portion 63A interposed therebetween, and two third arrangement portions 63C are first. It arrange | positions on both sides of arrangement | positioning part 63A and 2nd arrangement | positioning part 63B.

  A ventilation portion 65 is provided between the first placement portion 63A and the second placement portion 63B and between the second placement portion 63B and the third placement portion 63C. In the present embodiment, unlike the first embodiment, the intervals between the first placement portion 63A and the second placement portion 63B and between the second placement portion 63B and the third placement portion 63C are the same. Yes. The number of the plurality of hexagonal openings 64 in the four ventilation portions 65 is the same, and the total value of the opening areas of the hexagonal openings 64 is also the same.

  On the other hand, when compared with the first placement portion 63A, the second placement portion 63B, and the third placement portion 63C, the width is longer in the order of the first placement portion 63A, the second placement portion 63B, and the third placement portion 63C. It has become. In other words, the arrangement interval between the two central ventilation portions 65 is narrow, and the arrangement interval between the two central ventilation portions 65 and the outer ventilation portion 65 is wide.

  Note that the present embodiment is applied to an example in which the number of the photoelectric converters 62 arranged in the first arrangement unit 63A, the second arrangement unit 63B, and the third arrangement unit 63C is two, four, and five, respectively. As described above, the arrangement interval between the two ventilation portions 65 at the center is narrow, and the arrangement interval between the two ventilation portions 65 at the center and the ventilation portions 65 on the outside thereof is widened. It is not a thing.

  Next, how the cooling air WL flows in the line card 50 having the above configuration will be described with reference to FIGS. 7 and 8. Note that the flow of the cooling air WE flowing from the intake port 22 of the housing 11 is the same as that in the first embodiment, and thus the description thereof is omitted.

  When the large fan 25 is driven to rotate, the air outside the housing 11 is introduced into the line card 50 through the ventilation part 65 and the third ventilation part 67 as shown in FIG. The cooling air WL flows from the ventilation part 65 and the third ventilation part 67 provided in the interface unit 61 toward the exhaust port 24 via the substrate 51.

  Here, since the arrangement interval between the two central ventilation portions 65 is narrow and the arrangement interval between the two central ventilation portions 65 and the outer ventilation portion 65 is wide, the communication LSI 81 and its vicinity have a central location. The cooling air WL introduced through the two ventilation portions 65 is easy to flow. For this reason, the flow rate of the cooling air WL flowing in the communication LSI 81 and the vicinity thereof tends to be larger than the flow rate of the cooling air WL flowing in other regions.

  The cooling air WL flowing in the communication LSI 81 and the vicinity thereof cools the communication LSI 81 by contacting the heat sink 82 for communication LSI and removing heat. That is, the heat generated in the communication LSI 81 moves to the cooling air WL through the communication LSI heat sink 82. If the flow rate of the cooling air WL is large, the amount of heat of the communication LSI 81 that moves to the cooling air WL via the communication LSI heat sink 82 increases, so that the cooling performance increases.

  According to the line card 50 having the above configuration, the distance between the central two ventilation parts 65 arranged in the area close to the communication LSI 81 is narrower than the distance between the ventilation parts 65 arranged in the area far from the control unit. This makes it easy to secure the flow rate of the cooling air that flows around the communication LSI 81. Therefore, it becomes easy to cool the photoelectric converter 62 efficiently.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the present invention is not limited to those applied to the above-described embodiments, and may be applied to embodiments obtained by appropriately combining these embodiments, and is not particularly limited.

  Further, in the present embodiment, the present invention is a so-called one in which the line card can be inserted into and removed from the housing, and the type and number of line cards inserted into the housing can be changed according to the required number of ports (the number of arrangement portions). Although described as applied to a chassis type Ethernet switch, the present invention can also be applied to a so-called box type Ethernet switch provided with a predetermined number of ports (arrangement units).

DESCRIPTION OF SYMBOLS 50 ... Line card (communication apparatus), 52 ... Front side part (one side), 61 ... Interface unit (wall body), 62 ... Photoelectric converter (connection part), 63 ... Arrangement | positioning part, 63A ... 1st arrangement | positioning Part (arrangement part), 63B ... second arrangement part (arrangement part), 63C ... third arrangement part (arrangement part), 64 ... hexagonal opening (opening), 65 ... vent part, 65A ... first vent part, 65B ... 2nd ventilation part, 81 ... Communication LSI (control part)

Claims (5)

A substrate,
A connection portion used for communication with the outside of the wall provided on one side of the substrate is disposed, and a plurality of placement portions provided at intervals in the wall, and
A control unit disposed on the substrate and controlling communication with the outside via the connection unit;
A ventilation portion having an opening for allowing air to flow in or out between the outside and the inside of the wall body, the plurality of ventilation portions provided between the plurality of arrangement portions in the wall body;
Is provided,
The communication device has a larger total opening area of the ventilation portions in a region close to the control unit than a total opening area of the ventilation portions in a remote region.   The communication device according to claim 1, wherein a ventilation portion closest to the control unit among the plurality of ventilation portions has a larger total opening area than other ventilation portions.   The distance to the adjacent ventilation part in the ventilation part arranged in the area close to the control part is narrower than the interval to the adjacent ventilation part in the ventilation part arranged in the area far from the control part. Item 2. The communication device according to Item 1.   The communication device according to any one of claims 1 to 3, wherein the control unit is disposed at a center of the substrate when viewed from a direction in which the air flows.   The control unit performs control to send the communication information to the connection unit connected to the transmission destination based on information specifying a transmission destination included in communication information sent from the transmission source to the connection unit. The communication device according to claim 4, which is a device.