JP2011193367A - Network communication apparatus - Google Patents

Network communication apparatus Download PDF

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JP2011193367A
JP2011193367A JP2010059533A JP2010059533A JP2011193367A JP 2011193367 A JP2011193367 A JP 2011193367A JP 2010059533 A JP2010059533 A JP 2010059533A JP 2010059533 A JP2010059533 A JP 2010059533A JP 2011193367 A JP2011193367 A JP 2011193367A
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power supply
blower
communication
flow rate
air flow
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JP5308382B2 (en
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Nobuki Hatanaka
伸樹 畑中
Toshiro Mizumachi
俊朗 水町
Atsushi Nakano
敦史 仲野
Yujiro Sakai
祐二郎 酒井
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Panasonic Electric Works Networks Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress reduction in a working environment because of noise of a blower. <P>SOLUTION: Since the blowing quantity (rotational frequency) of the blower 11 is fixed in accordance with a set step (first step to fourth step), a network communication apparatus (switching hub) can reduce fluctuation of sound generated from the blower 11. Moreover, when a power supply amount of a power supply section 9 exceeds a maximum power supply amount according to the blowing quantity of the blower 11, a control unit 1 to be a power supply control means and a power supply control unit 10 stop power supply to a communication port 6, so that an atmospheric temperature in a housing 20 can be prevented from exceeding an upper limit of an operation temperature range of the switching hub. Consequently, reduction in the working environment due to noise of the blower 11 can be suppressed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、スイッチングハブなどのネットワーク通信装置に関し、特に通信ケーブルを介した給電機能を有するネットワーク通信装置に関する。   The present invention relates to a network communication device such as a switching hub, and more particularly to a network communication device having a power feeding function via a communication cable.

従来、100BASE-TXや1000BASE-TなどのＬＡＮで使用するツイストペアケーブル（通信ケーブル）を利用して、受電側の負荷機器に給電する機能を有したネットワーク通信装置が提供されている（例えば、特許文献１参照）。なお、受電側の負荷機器としては、無線ＬＡＮのアクセスポイントやネットワークカメラ、ＩＰ電話機などがある。   Conventionally, a network communication device having a function of supplying power to a load device on a power receiving side using a twisted pair cable (communication cable) used in a LAN such as 100BASE-TX or 1000BASE-T has been provided (for example, a patent) Reference 1). The load device on the power receiving side includes a wireless LAN access point, a network camera, an IP phone, and the like.

特許文献１に記載されている給電機能付きのネットワーク通信装置（スイッチングハブ）は、商用交流電源から所定の直流電力（電源電圧４８Ｖ）を生成し、通信ポートに接続された通信ケーブル（ツイストペアケーブル）を介して直流電力を供給（給電）している。ただし、このような給電機能については、IEEE802.3afやIEEE802.3atとして規格化されている。   A network communication device (switching hub) with a power supply function described in Patent Document 1 generates a predetermined DC power (power supply voltage 48V) from a commercial AC power supply and is connected to a communication port (twisted pair cable) DC power is supplied (powered) via However, such a power supply function is standardized as IEEE802.3af or IEEE802.3at.

特開２００７−２８１６２８号公報JP 2007-281628 A

ところで、上記給電機能付のネットワーク通信装置には、放熱用の送風機（ファン）を搭載する必要があるが、作業者の近くに設置された場合に送風機から生じる音（送風機の作動音や風切り音など）が騒音となって作業環境を低下させてしまう虞があった。また、直流電力の給電量に応じて送風機の送風量（回転数）を制御して騒音を抑えることも可能であるが、送風量（回転数）の変化に伴って送風機から生じる音に大小のゆらぎが生じ、その音のゆらぎが作業者に不快感を与えて作業環境を低下させてしまう虞がある。   By the way, although it is necessary to mount a blower (fan) for heat dissipation in the network communication device with a power feeding function, sound generated from the blower when installed near the worker (operation sound or wind noise of the blower). Etc.) may cause noise and reduce the working environment. In addition, it is possible to control the amount of air blown (number of rotations) of the blower according to the amount of DC power supplied, but to suppress noise. There is a risk that fluctuation will occur, and the fluctuation of the sound will cause discomfort to the operator and reduce the working environment.

本発明は、上記課題に鑑みて為されたものであり、送風機の騒音による作業環境の低下を抑えることができるネットワーク通信装置の提供を目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a network communication apparatus that can suppress a decrease in work environment due to noise from a blower.

本発明のネットワーク通信装置は、通信ケーブルが接続される１乃至複数の通信ポートと、当該通信ポートに接続された前記通信ケーブルを介してデータ通信を行う通信手段と、前記通信ポートに接続された前記通信ケーブルを介して電力を供給する給電手段と、当該給電手段から前記通信ポートへの給電を個別に停止する給電制御手段と、放熱用の送風機と、外部からの入力に応じて前記送風機の送風量を設定する送風量設定手段と、当該送風量設定手段で設定された送風量を超えないように前記送風機を制御する送風機制御手段と、前記給電手段の最大給電容量と前記送風量との対応関係を記憶した記憶手段とを備え、前記給電制御手段は、前記送風量設定手段で設定された前記送風量と対応する前記最大給電容量を前記対応関係に基づいて選択し、前記給電手段の給電量が当該最大給電容量を超えたときに少なくとも何れか１つの前記通信ポートを介した給電を停止することを特徴とする。   The network communication apparatus according to the present invention includes one or more communication ports to which a communication cable is connected, communication means for performing data communication via the communication cable connected to the communication port, and the communication port. Power supply means for supplying power via the communication cable, power supply control means for individually stopping power supply from the power supply means to the communication port, a heat dissipating blower, and the fan according to input from the outside An air volume setting means for setting an air flow rate, an air blower control means for controlling the air blower so as not to exceed the air flow volume set by the air flow rate setting means, a maximum power supply capacity of the power supply means, and the air flow rate Storage means storing a correspondence relationship, wherein the power supply control means is based on the maximum power supply capacity corresponding to the air flow rate set by the air flow rate setting means based on the correspondence relationship. Select Te, characterized by stopping the feed through at least one of the communication ports when the feeding amount of the feeding means exceeds the maximum feed capacity.

また、本発明のネットワーク通信装置は、通信ケーブルが接続される１乃至複数の通信ポートと、当該通信ポートに接続された前記通信ケーブルを介してデータ通信を行う通信手段と、前記通信ポートに接続された前記通信ケーブルを介して電力を供給する給電手段と、放熱用の送風機と、外部からの入力に応じて前記送風機の送風量を設定する送風量設定手段と、当該送風量設定手段で設定された送風量を超えないように前記送風機を制御する送風機制御手段と、前記給電手段の最大給電容量と前記送風量との対応関係を記憶した記憶手段と、前記給電手段の給電状況を報知する報知手段とを備え、前記報知手段は、前記送風量設定手段で設定された前記送風量と対応する前記最大給電容量を前記対応関係に基づいて選択し、前記給電手段の給電量が当該最大給電容量を超えたときに当該給電状況を報知することを特徴とする。   The network communication device of the present invention includes one or more communication ports to which a communication cable is connected, communication means for performing data communication via the communication cable connected to the communication port, and the communication port. Power supply means for supplying electric power through the communication cable, a blower for heat dissipation, an air volume setting means for setting the air volume of the blower according to an input from the outside, and setting by the air volume setting means A blower control means for controlling the blower so as not to exceed the blown air volume, a storage means for storing a correspondence relationship between the maximum power supply capacity of the power feed means and the air flow volume, and a power supply status of the power feed means A notification means, wherein the notification means selects the maximum power supply capacity corresponding to the air flow rate set by the air flow rate setting means based on the correspondence relationship, and the power supply means. Feed amount is equal to or notifying the feeding situation when exceeding the maximum power supply capacity.

このネットワーク通信装置において、前記送風量設定手段は、外部からの入力に応じて前記送風量を変更する際、変更しようとする送風量と対応した最大給電容量が前記送風量が変更される前の現在の給電容量を超えない場合に前記送風量を変更し、前記最大給電容量が前記給電容量を超えている場合は前記送風量を変更しないことが好ましい。   In this network communication device, when the air flow rate setting unit changes the air flow rate according to an input from the outside, the maximum power supply capacity corresponding to the air flow rate to be changed is changed before the air flow rate is changed. It is preferable that the air supply amount is changed when the current power supply capacity is not exceeded, and the air supply amount is not changed when the maximum power supply capacity exceeds the power supply capacity.

本発明のネットワーク通信装置は、送風機の騒音による作業環境の低下を抑えることができるという効果がある。   The network communication device of the present invention has an effect that it is possible to suppress a decrease in work environment due to the noise of the blower.

本発明の実施形態であるネットワーク通信装置（スイッチングハブ）のブロック図である。It is a block diagram of the network communication apparatus (switching hub) which is embodiment of this invention. 同上の背面図である。It is a rear view same as the above. 同上における送風機の送風量の設定動作を説明するためのフローチャートである。It is a flowchart for demonstrating the setting operation | movement of the ventilation volume of an air blower same as the above. 同上における給電制御の動作を説明するためのフローチャートである。It is a flowchart for demonstrating the operation | movement of the electric power feeding control in the same as the above.

以下、従来技術で説明したＬＡＮ用のネットワーク通信装置であるスイッチングハブに本発明の技術思想を適用した実施形態について説明する。   Hereinafter, an embodiment in which the technical idea of the present invention is applied to a switching hub which is a network communication device for LAN described in the prior art will be described.

本実施形態のスイッチングハブは、100BASE-TXのイーサネット（登録商標）や1000BASE-Tのギガビット・イーサネット（登録商標）に対応したＩＰネットワークに接続されるものである。このスイッチングハブは、図１に示すように制御部１、第１記憶部２、第２記憶部３、符号化／復号化部４、波形整形部５、通信ポート６、表示部７、操作入力受付部８、給電部９、給電制御部１０、送風機（ファン）１１、送風機制御部１２を備えている。   The switching hub of this embodiment is connected to an IP network compatible with 100BASE-TX Ethernet (registered trademark) or 1000BASE-T Gigabit Ethernet (registered trademark). As shown in FIG. 1, the switching hub includes a control unit 1, a first storage unit 2, a second storage unit 3, an encoding / decoding unit 4, a waveform shaping unit 5, a communication port 6, a display unit 7, and an operation input. A reception unit 8, a power supply unit 9, a power supply control unit 10, a blower (fan) 11, and a blower control unit 12 are provided.

制御部１はＣＰＵからなり、書換不可能な不揮発性の半導体メモリ（ＲＯＭ）からなる第１記憶部２に記憶されているプログラムを実行することで種々の処理を行う。第２記憶部３は書換可能な不揮発性の半導体メモリ（例えば、ＥＥＰＲＯＭやフラッシュメモリなど）からなり、制御部１が行う種々の処理に必要なデータ等を記憶している。   The control unit 1 includes a CPU, and performs various processes by executing a program stored in a first storage unit 2 including a non-rewritable nonvolatile semiconductor memory (ROM). The second storage unit 3 includes a rewritable nonvolatile semiconductor memory (for example, an EEPROM or a flash memory), and stores data necessary for various processes performed by the control unit 1.

符号化／復号化部４は、制御部１が生成する伝送フレーム（ＭＡＣフレーム）を符号化するとともに受信したＭＡＣフレームを復号化する。波形整形部５は、符号化されたＭＡＣフレームのビット列を電気信号（通信信号）に変換するとともに受信した電気信号（通信信号）を波形整形してビット列を再生する。通信ポート６はＲＪ４５のモジュラジャックからなり、エンハンスト・カテゴリ５やカテゴリ６などのツイストペアケーブルからなる通信ケーブルＬｓの先端に付設されているＲＪ４５のモジュラプラグが挿抜自在に接続される。なお、符号化／復号化部４と波形整形部５が通信手段に相当する。   The encoding / decoding unit 4 encodes the transmission frame (MAC frame) generated by the control unit 1 and decodes the received MAC frame. The waveform shaping unit 5 converts the bit string of the encoded MAC frame into an electric signal (communication signal) and reshapes the received electric signal (communication signal) to reproduce the bit string. The communication port 6 is composed of an RJ45 modular jack, and an RJ45 modular plug attached to the tip of a communication cable Ls composed of a twisted pair cable such as enhanced category 5 or category 6 is detachably connected. The encoding / decoding unit 4 and the waveform shaping unit 5 correspond to communication means.

表示部７は、発光ダイオードなどの表示素子（図示せず）と、表示素子を発光させる発光回路（図示せず）とを有する。操作入力受付部８は複数の押釦スイッチを有し、押釦スイッチの押操作による操作入力を受け付けて制御部１に渡すものである。ただし、操作入力受付部８の代わりに、汎用のシリアル通信（例えば、ＲＳ２３２Ｃ）を行うためのシリアル通信インタフェース（Ｉ／Ｆ）部とシリアル通信用の通信ポートを備えても良い。   The display unit 7 includes a display element (not shown) such as a light emitting diode and a light emitting circuit (not shown) for causing the display element to emit light. The operation input accepting unit 8 has a plurality of push button switches, and accepts an operation input by a push operation of the push button switch and passes it to the control unit 1. However, instead of the operation input reception unit 8, a serial communication interface (I / F) unit for performing general-purpose serial communication (for example, RS232C) and a communication port for serial communication may be provided.

給電手段に相当する給電部９は、例えば商用交流電源から直流電力を生成するスイッチング電源回路からなり、生成した直流電力を通信ポート６から通信ケーブルＬｓを介して給電する。給電制御部１０は、給電部９から複数の通信ポート６への給電路（図示せず）を個別に開閉する複数のリレーや、これら複数のリレーを駆動するリレー駆動回路、各給電路への給電量を計測する給電量計測回路などを具備している。給電制御部１０では、図示しない給電量計測回路で定期的に計測した各給電路（通信ポート６）毎の給電量（給電電力）を制御部１に通知する。   The power supply unit 9 corresponding to the power supply means is composed of, for example, a switching power supply circuit that generates DC power from a commercial AC power supply, and supplies the generated DC power from the communication port 6 via the communication cable Ls. The power supply control unit 10 includes a plurality of relays that individually open and close power supply paths (not shown) from the power supply unit 9 to the plurality of communication ports 6, a relay drive circuit that drives the plurality of relays, A power supply amount measuring circuit for measuring the power supply amount is provided. The power supply control unit 10 notifies the control unit 1 of the power supply amount (power supply power) for each power supply path (communication port 6) periodically measured by a power supply amount measurement circuit (not shown).

ここで、制御部１、第１記憶部２、第２記憶部３、符号化／復号化部４、波形整形部５、通信ポート６、表示部７、操作入力受付部８、給電部９、給電制御部１０、送風機制御部１２は、図示しないプリント配線板に実装されて金属製あるいは合成樹脂製の筐体（ハウジング）２０内に収納されている。そして、図２に示すように、筐体２０の背面に通気用の３つの網目（メッシュ）部２１が形成され、これら３つの網目部２１の内側にそれぞれ送風機１１が配設されている。すなわち、送風機１１を運転して筐体２０内の空気を筐体２０外へ排気することにより、筐体２０内の雰囲気温度がスイッチングハブの動作温度範囲の上限（例えば、４０℃〜５０℃）を超えないようにしている。   Here, the control unit 1, the first storage unit 2, the second storage unit 3, the encoding / decoding unit 4, the waveform shaping unit 5, the communication port 6, the display unit 7, the operation input receiving unit 8, the power feeding unit 9, The power supply control unit 10 and the blower control unit 12 are mounted on a printed wiring board (not shown) and housed in a metal or synthetic resin casing 20. As shown in FIG. 2, three mesh portions 21 for ventilation are formed on the back surface of the housing 20, and the blower 11 is disposed inside each of the three mesh portions 21. That is, by operating the blower 11 and exhausting the air in the housing 20 to the outside of the housing 20, the ambient temperature in the housing 20 is the upper limit of the operating temperature range of the switching hub (for example, 40 ° C. to 50 ° C.). Is not exceeded.

送風機制御部１２は、設定された送風量で送風するように送風機１１を制御するものであって、具体的には送風機１１の回転数が設定された回転数と一致するように送風機１１のモータを制御する。ただし、送風機制御部１２が送風機１１の送風量（回転数）を制御する具体的な方法については従来周知であるから説明を省略する。   The blower control unit 12 controls the blower 11 so as to blow with a set amount of blown air, and specifically, the motor of the blower 11 so that the rotational speed of the blower 11 matches the set rotational speed. To control. However, since a specific method for the blower control unit 12 to control the blown amount (rotation speed) of the blower 11 is well known in the art, the description thereof is omitted.

ところで、本実施形態では送風機１１の送風量（回転数）を４段階に設定することができる。すなわち、送風機１１の最大送風量（最高回転数）を１００％としたとき、第１段階（Minモード）は２０％の送風量（回転数）、第２段階（Lowモード）は５０％の送風量（回転数）、第３段階（Middleモード）は８０％の送風量（回転数）、第４段階（Highモード）は１００％の送風量（回転数）にそれぞれ設定される。ここで、送風機１１から生じる音（騒音）の大きさ（音量）および放熱量と送風機１１の送風量（回転数）との間には正の相関関係があり、回転数が高くなる（１００％に近付く）につれて騒音の音量並びに放熱量も増大する。したがって、本実施形態のスイッチングハブがオフィスのように静かな場所に設置される場合、通常は第１段階や第２段階に設定される。反対に、工場のように騒々しい場所に設置される場合、若しくはラック又は盤内に設置される場合、通常は第３段階や第４段階に設定される。なお、制御部１は、操作入力受付部８で受け付ける操作入力（外部からの入力）に基づいて選択した何れかの段階（第１段階〜第４段階）を第２記憶部３に記憶することで送風量（回転数）の設定を行っている。つまり、本実施形態では制御部１と第２記憶部３と操作入力受付部８が送風量設定手段に相当する。   By the way, in this embodiment, the ventilation volume (rotation speed) of the air blower 11 can be set to four steps. That is, assuming that the maximum air flow rate (maximum rotation speed) of the blower 11 is 100%, the first stage (Min mode) is 20% air volume (rotation speed) and the second stage (Low mode) is 50% transmission. The air volume (number of rotations), the third stage (Middle mode) are set to 80% air flow (number of rotations), and the fourth stage (High mode) is set to 100% air volume (number of rotations). Here, there is a positive correlation between the magnitude (volume) and the heat radiation amount of sound (noise) generated from the blower 11 and the blown amount (rotation speed) of the blower 11, and the rotation speed becomes high (100%). The volume of noise and the amount of heat dissipation increase as the value approaches. Therefore, when the switching hub of this embodiment is installed in a quiet place such as an office, it is usually set to the first stage or the second stage. On the other hand, when installed in a noisy place such as a factory, or when installed in a rack or panel, it is usually set to the third stage or the fourth stage. The control unit 1 stores in the second storage unit 3 any stage (first stage to fourth stage) selected based on the operation input (input from the outside) received by the operation input receiving unit 8. The air volume (number of rotations) is set with. That is, in this embodiment, the control part 1, the 2nd memory | storage part 3, and the operation input reception part 8 are equivalent to a ventilation volume setting means.

ここで、送風機１１の送風量が少なくなるほど放熱量も減少するので、給電部９の給電量が増えた場合、筐体２０内の雰囲気温度がスイッチングハブの動作温度範囲の上限を超えてしまう虞がある。そのために本実施形態では、給電部９の給電量の最大値（最大給電容量）を、設定された送風量に応じて調整している。具体的には、第３段階と第４段階の最大給電容量を定格値（例えば、１７０ワット）とし、第２段階の最大給電容量を１２４ワット、第１段階の最大給電容量を６２ワットとする。ただし、送風量（回転数）の各段階と、それぞれの段階における最大給電容量との対応関係が第２記憶部３に記憶されている。つまり、本実施形態では第２記憶部３が記憶手段に相当する。なお、各段階における最大給電容量の数値は一例であって、これに限定する趣旨ではない。   Here, since the amount of heat radiation decreases as the amount of air blown by the blower 11 decreases, the ambient temperature in the housing 20 may exceed the upper limit of the operating temperature range of the switching hub when the power supply amount of the power supply unit 9 increases. There is. Therefore, in this embodiment, the maximum value (maximum power supply capacity) of the power supply amount of the power supply unit 9 is adjusted according to the set airflow amount. Specifically, the maximum power supply capacity of the third stage and the fourth stage is set to a rated value (for example, 170 watts), the maximum power supply capacity of the second stage is 124 watts, and the maximum power supply capacity of the first stage is 62 watts. . However, the correspondence relationship between each stage of the air flow rate (the number of rotations) and the maximum power supply capacity at each stage is stored in the second storage unit 3. That is, in the present embodiment, the second storage unit 3 corresponds to a storage unit. In addition, the numerical value of the maximum power supply capacity at each stage is an example, and is not intended to be limited to this.

次に、図３のフローチャートを参照して、送風機１１の送風量（回転数）を設定する際の動作を説明する。   Next, with reference to the flowchart of FIG. 3, the operation | movement at the time of setting the ventilation volume (rotation speed) of the air blower 11 is demonstrated.

まず、複数の押釦スイッチが同時に長押しされると操作入力受付部８が設定モードへの切換の操作入力を受け付けて制御部１に渡す。制御部１は、操作入力受付部８から操作入力を受け付けて設定モードに切り換わり、送風量（回転数）の選択の操作入力を待つ（ステップＳ１）。このとき、表示部７では第１段階から第４段階の４つの段階に対応した表示素子の何れか１つを発光させる。なお、切換用の押釦スイッチが押操作されて操作入力受付部８で操作入力が受け付けられる毎に、制御部１が表示部７を制御して、第１段階に対応する表示素子から第４段階に対応する表示素子の何れか１つの表示素子を択一的に切り換えて発光させる。   First, when a plurality of pushbutton switches are pressed at the same time, the operation input receiving unit 8 receives an operation input for switching to the setting mode and passes it to the control unit 1. The control unit 1 receives an operation input from the operation input receiving unit 8 and switches to the setting mode, and waits for an operation input for selecting an air flow rate (the number of rotations) (step S1). At this time, the display unit 7 causes any one of the display elements corresponding to the four stages from the first stage to the fourth stage to emit light. Each time the switching pushbutton switch is pressed and an operation input is received by the operation input receiving unit 8, the control unit 1 controls the display unit 7 to change the display element corresponding to the first stage to the fourth stage. One of the display elements corresponding to is selectively switched to emit light.

そして、選択用の押釦スイッチが押操作されて操作入力受付部８が選択の操作入力を受け付けると、制御部１は、その時点で発光している表示素子に対応した段階、すなわち、選択された段階が第１段階であるか否かを判定する（ステップＳ２）。選択された段階が第１段階であると判定した場合、制御部１は、給電制御部１０から取得した現在の給電量と、第２記憶部３に記憶している対応関係から取得した最大給電容量（６２ワット）とを比較する（ステップＳ３）。そして、現在の給電量が最大給電容量を超えていれば、送風量の設定処理を中止してステップＳ１に戻る。一方、現在の給電量が最大給電容量を超えていなければ、制御部１は、第１段階の送風量（回転数）と第１段階に対応する最大給電容量を第２記憶部３に記憶（設定）し（ステップＳ４）、その後にステップＳ１に戻る。   When the selection pushbutton switch is pressed and the operation input receiving unit 8 receives a selection operation input, the control unit 1 is in a stage corresponding to the display element emitting light at that time, that is, the selected one. It is determined whether or not the stage is the first stage (step S2). When it is determined that the selected stage is the first stage, the control unit 1 determines the maximum power supply acquired from the current power supply amount acquired from the power supply control unit 10 and the correspondence stored in the second storage unit 3. The capacity (62 watts) is compared (step S3). If the current power supply amount exceeds the maximum power supply capacity, the process for setting the air flow rate is stopped and the process returns to step S1. On the other hand, if the current power supply amount does not exceed the maximum power supply capacity, the control unit 1 stores the first stage air flow rate (number of rotations) and the maximum power supply capacity corresponding to the first stage in the second storage unit 3 ( Set) (step S4), and then return to step S1.

同様に、選択された段階が第２段階であると判定した場合（ステップＳ５）、制御部１は、給電制御部１０から取得した現在の給電量と、第２記憶部３に記憶している対応関係から取得した最大給電容量（１２４ワット）とを比較する（ステップＳ６）。そして、現在の給電量が最大給電容量を超えていれば、送風量の設定処理を中止してステップＳ１に戻る。一方、現在の給電量が最大給電容量を超えていなければ、制御部１は、第２段階の送風量（回転数）と第２段階に対応する最大給電容量を第２記憶部３に記憶（設定）し（ステップＳ７）、その後にステップＳ１に戻る。   Similarly, when it is determined that the selected stage is the second stage (step S5), the control unit 1 stores the current power supply amount acquired from the power supply control unit 10 and the second storage unit 3. The maximum power supply capacity (124 watts) acquired from the correspondence relationship is compared (step S6). If the current power supply amount exceeds the maximum power supply capacity, the process for setting the air flow rate is stopped and the process returns to step S1. On the other hand, if the current power supply amount does not exceed the maximum power supply capacity, the control unit 1 stores the second stage air flow rate (number of rotations) and the maximum power supply capacity corresponding to the second stage in the second storage unit 3 ( Set) (step S7), and then the process returns to step S1.

また、選択された段階が第３段階であると判定した場合（ステップＳ８）、制御部１は、第３段階の送風量（回転数）と第３段階に対応する最大給電容量を第２記憶部３に記憶（設定）し（ステップＳ９）、その後にステップＳ１に戻る。   When it is determined that the selected stage is the third stage (step S8), the control unit 1 stores the third stage air flow rate (the number of rotations) and the maximum power supply capacity corresponding to the third stage in the second storage. Store (set) in the unit 3 (step S9), and then return to step S1.

同様に、選択された段階が第４段階であると判定した場合（ステップＳ８）、制御部１は、第４段階の送風量（回転数）と第４段階に対応する最大給電容量を第２記憶部３に記憶（設定）し（ステップＳ１０）、その後にステップＳ１に戻る。   Similarly, when it is determined that the selected stage is the fourth stage (step S8), the controller 1 sets the second stage air flow rate (number of rotations) and the maximum power supply capacity corresponding to the fourth stage to the second stage. Store (set) in the storage unit 3 (step S10), and then return to step S1.

ここで、変更（設定）しようとする段階に対応した最大給電容量を現在の給電量が超えている場合、変更後の送風量では放熱量が不足して動作温度範囲の上限を超えてしまう虞がある。したがって、上述のように変更（設定）しようとする段階に対応した最大給電容量を現在の給電量が超えていない場合にのみ、送風量の段階を変更可能としている。ただし、第３段階および第４段階に対応した最大給電容量が定格値であり、現在の給電量が定格値以下であることは明らかであるので、第３段階および第４段階が選択された場合には現在の給電量と最大給電容量との比較は行わない。   Here, if the current power supply amount exceeds the maximum power supply capacity corresponding to the stage to be changed (set), there is a risk that the airflow after the change will be insufficient and the upper limit of the operating temperature range will be exceeded. There is. Therefore, only when the current power supply amount does not exceed the maximum power supply capacity corresponding to the stage to be changed (set) as described above, the stage of the blown air amount can be changed. However, since the maximum power supply capacity corresponding to the third stage and the fourth stage is the rated value, and it is clear that the current power supply amount is less than the rated value, the third stage and the fourth stage are selected. Does not compare the current power supply amount with the maximum power supply capacity.

ただし、操作入力受付部８の代わりにシリアル通信Ｉ／Ｆ部とシリアル通信用の通信ポートを備えていれば、同じシリアル通信用のインタフェースを有するネットワーク端末（コンピュータ装置）からシリアル通信用の通信ケーブルを介したデータ通信によって、上述した設定作業を行うことができる。   However, if a serial communication I / F unit and a serial communication communication port are provided instead of the operation input receiving unit 8, a communication cable for serial communication from a network terminal (computer device) having the same serial communication interface. The above-described setting work can be performed by data communication via the.

次に、給電部９から各通信ポート６への給電を制御する動作について、図４のフローチャートを参照して詳細に説明する。   Next, an operation for controlling power supply from the power supply unit 9 to each communication port 6 will be described in detail with reference to the flowchart of FIG.

制御部１は、給電制御部１０から定期的に通知される各通信ポート６毎の給電量（給電電力）を給電上限値と比較し（ステップＳ１）、何れかの通信ポート６の給電量が給電上限値を超えていれば、給電制御部１０に指示して当該通信ポート６への給電を停止する（ステップＳ２）。なお、給電上限値は規格（IEEE802.3af）で規定されている値（１５．４ワット）や、規格（IEEE802.3at）で規定されている値（３０．０ワット）となる。ただし、利用者が規格に規定されている範囲内で給電上限値を独自に設定することも可能である。   The control unit 1 compares the power supply amount (power supply power) for each communication port 6 periodically notified from the power supply control unit 10 with the power supply upper limit value (step S1), and the power supply amount of any communication port 6 is determined. If the power supply upper limit value is exceeded, the power supply control unit 10 is instructed to stop power supply to the communication port 6 (step S2). The upper limit value of power supply is a value (15.4 watts) defined by the standard (IEEE802.3af) or a value (30.0 watts) defined by the standard (IEEE802.3at). However, it is also possible for the user to set the power supply upper limit value independently within the range specified in the standard.

一方、何れの通信ポート６の給電量も給電上限値以下である場合、制御部１は、すべての通信ポート６への給電量の総量（給電部９の給電量）を最大給電容量と比較し（ステップＳ３）、給電量の総量が最大給電容量以下であればステップＳ１に戻る。給電量の総量が最大給電容量を超えた場合、制御部１は、給電管理方式が優先度判別方式であるか否かを判定する（ステップＳ４）。給電管理方式とは、上述のように給電量の総量が最大給電容量を超えた場合に行われる処理の方式であって、優先度判別方式と最終接続ポート停止方式の２種類が用意されている。前者の優先度判別方式とは、各通信ポート６毎に３段階の優先度（低・中・高）が設定され、優先度の低い通信ポート６から順番に給電を停止する方式である。後者の最終接続ポート停止方式とは、最後に通信ケーブルＬｓが接続された通信ポート６への給電を停止する方式である。なお、何れの給電管理方式が実行されるかということは、予め選択されて第２記憶部３に記憶されている。   On the other hand, when the power supply amount of any communication port 6 is equal to or less than the power supply upper limit value, the control unit 1 compares the total power supply amount (power supply amount of the power supply unit 9) to all the communication ports 6 with the maximum power supply capacity. (Step S3) If the total amount of power supply is equal to or less than the maximum power supply capacity, the process returns to Step S1. When the total amount of power supply exceeds the maximum power supply capacity, the control unit 1 determines whether or not the power supply management method is a priority determination method (step S4). The power supply management method is a method of processing performed when the total amount of power supply exceeds the maximum power supply capacity as described above, and two types of priority determination method and final connection port stop method are prepared. . The former priority determination method is a method in which three levels of priority (low, medium, and high) are set for each communication port 6 and power supply is stopped in order from the communication port 6 with the lowest priority. The latter final connection port stop method is a method of stopping power supply to the communication port 6 to which the communication cable Ls is finally connected. Note that which power supply management method is executed is selected in advance and stored in the second storage unit 3.

したがって、第２記憶部３に記憶されている給電管理方式が優先度判別方式であった場合、制御部１は第２記憶部３に記憶されている各通信ポート６の優先度を参照し、優先度が最も低い通信ポート６への給電を停止するように給電制御部１０に指示する（ステップＳ５）。また、第２記憶部３に記憶されている給電管理方式が最終接続ポート停止方式であった場合、制御部１は第２記憶部３に記憶されている各通信ポート６毎の履歴を参照し、通信ケーブルＬｓが最後に接続された通信ポート６への給電を停止するように給電制御部１０に指示する（ステップＳ６）。そして、制御部１０からの指示に応じて給電制御部１０が何れかの通信ポート６への給電を停止することにより、給電量の総量を最大給電容量以下に抑えることができる。すなわち、本実施形態では制御部１と給電制御部１０が給電制御手段に相当する。   Therefore, when the power supply management method stored in the second storage unit 3 is the priority determination method, the control unit 1 refers to the priority of each communication port 6 stored in the second storage unit 3, The power supply control unit 10 is instructed to stop power supply to the communication port 6 having the lowest priority (step S5). When the power supply management method stored in the second storage unit 3 is the final connection port stop method, the control unit 1 refers to the history of each communication port 6 stored in the second storage unit 3. Then, the power supply control unit 10 is instructed to stop power supply to the communication port 6 to which the communication cable Ls is last connected (step S6). Then, in response to an instruction from the control unit 10, the power supply control unit 10 stops power supply to any one of the communication ports 6, whereby the total amount of power supply can be suppressed to a maximum power supply capacity or less. That is, in the present embodiment, the control unit 1 and the power supply control unit 10 correspond to power supply control means.

上述のように本実施形態によれば、設定された段階（第１段階〜第４段階）に応じて送風機１１の送風量（回転数）が固定されるため、送風機１１から生じる音のゆらぎを低減することができる。しかも、給電部９の給電量が送風機１１の送風量に応じた最大給電容量を超えた場合、給電制御手段たる制御部１と給電制御部１０が通信ポート６への給電を停止するので、筐体２０内の雰囲気温度がスイッチングハブの動作温度範囲の上限を超えてしまうことが防止できる。これにより、本実施形態では送風機１１の騒音による作業環境の低下を抑えることができる。   As described above, according to the present embodiment, the amount of air blown (rotational speed) of the blower 11 is fixed in accordance with the set stage (first stage to fourth stage), so that the sound fluctuation generated from the blower 11 is reduced. Can be reduced. In addition, when the power supply amount of the power supply unit 9 exceeds the maximum power supply capacity according to the airflow rate of the blower 11, the control unit 1 and the power supply control unit 10 serving as power supply control means stop power supply to the communication port 6. It can prevent that the atmospheric temperature in the body 20 exceeds the upper limit of the operating temperature range of the switching hub. Thereby, in this embodiment, the fall of the working environment by the noise of the air blower 11 can be suppressed.

また、利用者にとっては、筐体２０内の雰囲気温度が動作温度範囲内に収まるか否かを考慮せずに、作業環境に応じて送風機１１の送風量を選択することができるという利点がある。特に、給電側の負荷機器がＩＰ電話機である場合、スイッチングハブの送風機１１の騒音が低減されることで快適に通話することができる。   In addition, for the user, there is an advantage that the air flow rate of the blower 11 can be selected according to the work environment without considering whether the ambient temperature in the housing 20 is within the operating temperature range. . In particular, when the load device on the power supply side is an IP telephone, it is possible to talk comfortably by reducing the noise of the blower 11 of the switching hub.

ところで、上述のように給電部９の給電量が最大給電容量を超えた場合に所定の通信ポート６への給電を強制的に停止させる代わりに、給電量が最大給電容量を超えたことを利用者に報知し、何らかの対処を行うように利用者を促すようにしても構わない。利用者への報知方法としては、例えば、制御部１が表示部７の表示素子を点滅させる方法が考えられる。また他の報知方法として、制御部１をSNMP(Simple Network Management Protocol)エージェントとし、利用者又はネットワーク管理者のコンピュータをSNMPマネージャとして、制御部１のSNMPエージェントからSNMPマネージャに対してSNMPトラップによって報知する方法が考えられる。   By the way, instead of forcibly stopping power supply to a predetermined communication port 6 when the power supply amount of the power supply unit 9 exceeds the maximum power supply capacity as described above, the fact that the power supply amount exceeds the maximum power supply capacity is used. The user may be notified and prompted to take some action. As a notification method to the user, for example, a method in which the control unit 1 blinks the display element of the display unit 7 can be considered. As another notification method, the control unit 1 is an SNMP (Simple Network Management Protocol) agent, the user or network administrator's computer is an SNMP manager, and the SNMP agent of the control unit 1 notifies the SNMP manager by an SNMP trap. A way to do this is conceivable.

このように給電部９の給電量が送風機１１の送風量に応じた最大給電容量を超えた場合、報知手段たる制御部１（あるいは制御部１と表示部７）が利用者に対して給電状況を報知すれば、何らかの対処を行うように利用者を促して筐体２０内の雰囲気温度がスイッチングハブの動作温度範囲の上限を超えてしまうことが防止できる。これにより、送風機１１の騒音による作業環境の低下を抑えることができる。   As described above, when the power supply amount of the power supply unit 9 exceeds the maximum power supply capacity according to the airflow amount of the blower 11, the control unit 1 (or the control unit 1 and the display unit 7) serving as a notification unit supplies power to the user. Can be urged to take some countermeasures and prevent the ambient temperature in the housing 20 from exceeding the upper limit of the operating temperature range of the switching hub. Thereby, the fall of the work environment by the noise of the air blower 11 can be suppressed.

１ 制御部（給電制御手段，送風機制御手段）
３ 第２記憶部（記憶手段）
４ 符号化／復号化部（通信手段）
５ 波形整形部（通信手段）
６ 通信ポート
７ 表示部（報知手段）
９ 給電部（給電手段）
１０ 給電制御部（給電制御手段）
１１ 送風機
１２ 送風機制御部（送風機制御手段）
Ｌｓ 通信ケーブル 1 Control unit (power supply control means, blower control means)
3 Second storage section (storage means)
4 Encoding / decoding unit (communication means)
5 Waveform shaping part (communication means)
6 Communication port 7 Display (notification means)
9 Power supply unit (power supply means)
10 Power supply control unit (power supply control means)
11 Blower 12 Blower Control Unit (Blower Control Unit)
Ls communication cable

Claims (3)

通信ケーブルが接続される１乃至複数の通信ポートと、当該通信ポートに接続された前記通信ケーブルを介してデータ通信を行う通信手段と、前記通信ポートに接続された前記通信ケーブルを介して電力を供給する給電手段と、当該給電手段から前記通信ポートへの給電を個別に停止する給電制御手段と、放熱用の送風機と、外部からの入力に応じて前記送風機の送風量を設定する送風量設定手段と、当該送風量設定手段で設定された送風量を超えないように前記送風機を制御する送風機制御手段と、前記給電手段の最大給電容量と前記送風量との対応関係を記憶した記憶手段とを備え、
前記給電制御手段は、前記送風量設定手段で設定された前記送風量と対応する前記最大給電容量を前記対応関係に基づいて選択し、前記給電手段の給電量が当該最大給電容量を超えたときに少なくとも何れか１つの前記通信ポートを介した給電を停止することを特徴とするネットワーク通信装置。 One or a plurality of communication ports to which a communication cable is connected, communication means for performing data communication via the communication cable connected to the communication port, and power via the communication cable connected to the communication port Power supply means to be supplied, power supply control means for individually stopping power supply from the power supply means to the communication port, a heat dissipating blower, and an airflow setting for setting the airflow of the blower according to an external input Means, blower control means for controlling the blower so as not to exceed the air flow rate set by the air flow rate setting means, and storage means for storing a correspondence relationship between the maximum power supply capacity of the power supply means and the air flow rate With
The power supply control unit selects the maximum power supply capacity corresponding to the airflow rate set by the airflow rate setting unit based on the correspondence relationship, and when the power supply amount of the power supply unit exceeds the maximum power supply capacity A network communication device, wherein power supply via at least one of the communication ports is stopped. 通信ケーブルが接続される１乃至複数の通信ポートと、当該通信ポートに接続された前記通信ケーブルを介してデータ通信を行う通信手段と、前記通信ポートに接続された前記通信ケーブルを介して電力を供給する給電手段と、放熱用の送風機と、外部からの入力に応じて前記送風機の送風量を設定する送風量設定手段と、当該送風量設定手段で設定された送風量を超えないように前記送風機を制御する送風機制御手段と、前記給電手段の最大給電容量と前記送風量との対応関係を記憶した記憶手段と、前記給電手段の給電状況を報知する報知手段とを備え、
前記報知手段は、前記送風量設定手段で設定された前記送風量と対応する前記最大給電容量を前記対応関係に基づいて選択し、前記給電手段の給電量が当該最大給電容量を超えたときに当該給電状況を報知することを特徴とするネットワーク通信装置。 One or a plurality of communication ports to which a communication cable is connected, communication means for performing data communication via the communication cable connected to the communication port, and power via the communication cable connected to the communication port The power supply means to supply, the blower for heat dissipation, the air volume setting means for setting the air volume of the fan according to the input from the outside, and the air volume set by the air volume setting means so as not to exceed the air volume A blower control means for controlling the blower, a storage means for storing a correspondence relationship between the maximum power supply capacity of the power supply means and the air flow rate, and a notification means for notifying the power supply status of the power supply means,
The notifying means selects the maximum power supply capacity corresponding to the airflow set by the airflow setting means based on the correspondence relationship, and when the power supply of the power supply exceeds the maximum power supply capacity. A network communication device that reports the power supply status. 前記送風量設定手段は、外部からの入力に応じて前記送風量を変更する際、変更しようとする送風量と対応した最大給電容量が前記送風量が変更される前の現在の給電容量を超えない場合に前記送風量を変更し、前記最大給電容量が前記給電容量を超えている場合は前記送風量を変更しないことを特徴とする請求項１又は２記載のネットワーク通信装置。   When the air flow rate setting means changes the air flow rate in response to an external input, the maximum power supply capacity corresponding to the air flow rate to be changed exceeds the current power supply capacity before the air flow rate is changed. The network communication device according to claim 1 or 2, wherein the air flow rate is changed when there is not, and the air flow rate is not changed when the maximum power supply capacity exceeds the power supply capacity.
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JPH07244535A (en) * 1994-03-02 1995-09-19 Fujitsu Ltd Degenerate operation controller utilizing detection of cooling state abnormality
JP2004200933A (en) * 2002-12-17 2004-07-15 Nec Corp Network relaying apparatus and terminal feeding power calculating method in the network relaying apparatus
JP2007088809A (en) * 2005-09-22 2007-04-05 Alaxala Networks Corp PoE (POWER OVER ETHERNET(R)) SYSTEM
JP2007102323A (en) * 2005-09-30 2007-04-19 Kyocera Mita Corp Information processing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07244535A (en) * 1994-03-02 1995-09-19 Fujitsu Ltd Degenerate operation controller utilizing detection of cooling state abnormality
JP2004200933A (en) * 2002-12-17 2004-07-15 Nec Corp Network relaying apparatus and terminal feeding power calculating method in the network relaying apparatus
JP2007088809A (en) * 2005-09-22 2007-04-05 Alaxala Networks Corp PoE (POWER OVER ETHERNET(R)) SYSTEM
JP2007102323A (en) * 2005-09-30 2007-04-19 Kyocera Mita Corp Information processing device

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