JP4130863B2 - COMMUNICATION DEVICE AND COMMUNICATION DEVICE CONNECTION CONTROL METHOD - Google Patents

COMMUNICATION DEVICE AND COMMUNICATION DEVICE CONNECTION CONTROL METHOD Download PDF

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Publication number
JP4130863B2
JP4130863B2 JP2000104723A JP2000104723A JP4130863B2 JP 4130863 B2 JP4130863 B2 JP 4130863B2 JP 2000104723 A JP2000104723 A JP 2000104723A JP 2000104723 A JP2000104723 A JP 2000104723A JP 4130863 B2 JP4130863 B2 JP 4130863B2
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Prior art keywords
unit
public network
communication device
terminal device
power supply
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JP2001292200A (en
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正利 山本
俊之 浦沢
太郎 三浦
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Oki Electric Industry Co Ltd
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Oki Electric Industry Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Description

【０００１】
【産業上の利用分野】
本発明は、公衆網交換機と電話機・ＦＡＸ等の端末装置間に接続される通信装置および通信装置の接続制御方法に関するものである。
【０００２】
【従来の技術】
図３は、従来の通信装置の構成を示すブロック図である。
待機状態では回線部７０には公衆網交換機４００よりノーマル給電（Ｌ１側：−、Ｌ２側：＋）され、端末部３０にも電源回路部５０よりノーマル給電（Ｔ１側：−、Ｔ２側：＋）されている。
【０００３】
着信状態に移行すると、回線部７０では、公衆網交換機４００からの極性反転信号によりレバース給電（Ｌ１側：＋、Ｌ２側−）に変わる。回線モニタ部１００では回線電圧による極性反転信号を検出して、制御部１２０に通知する。制御部１２０では回線部７０と端末部３０間をスルー状態にする為、切替回路部４０を切替える。したがって、公衆網交換機４００からの着信信号が端末装置３００に接続さる。
【０００４】
発信状態では、端末装置３００からのオフフック状態を、通話電流により監視している端末モニタ部８０で検出して、制御部１２０に通知する。制御部１２０ではトーン送出部１１２からＤＴ音を送出し、端末装置３００でそのＤＴ音を確認し、続けてダイヤル番号を発信する。そのダイヤル番号を、ＤＰの場合は端末モニタ部８０で、ＰＢの場合はＤＴＭＦ検出部１１３でそれぞれ検出する。制御部１２０は、発信動作の為、直流ループ回路の開閉制御を行っている直流ループ駆動部９０に対して直流ループ回路を閉じて、公衆網交換機４００からのＤＴ音をトーン検出部１１１で検出する。その後、ＤＰの場合は直流ループ駆動部９０より、ＰＢの場合はＤＴＭＦ送出部１１４よりＬＣＲ番号を付加したダイヤル番号を発信する。それを受けて、リングバックトーンが公衆網交換機４００から送出され、相手応答を検出すると、極性反転信号が公衆網交換機４００から送出される。以下の接続動作は、着信状態に移行した場合と同じである。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記従来の通信装置では、待機状態から着信状態に移行する場合、回線部７０と端末部３０が個別の給電極性を持っている為、公衆網交換機４００から送出される着信信号前の極性反転信号により、回線部７０と端末部３０の給電極性が逆になる。よって、制御部１２０からの制御で切替回路部４０が回線部７０と端末部３０間をスルー状態にすると、端末部３０ではそれまで端末装置３００内部の静電容量に充電された電荷が一時的に放電、充電される。そのため、端末モニタ部８０や回線モニタ部１００や公衆網交換機４００に過渡電流が流れ、端末装置３００の応答誤検出の要因となっていた。
【０００６】
また、過渡電流が流れるのを防止する為に、一定時間は極性反転を監視しない方法もあったが、処理時間が長くなってしまい、技術的に満足できるものではなかった。
【０００７】
【課題を解決するための手段】
本発明は、上記の課題を解決するために、公衆網交換機と端末装置間に接続される通信装置において、電流を供給する電源回路と、前記端末装置の電源を、前記通信装置の前記電源回路とするかまたは前記公衆網交換機とするかを選択する切替回路とを有し、前記端末装置と前記切替回路との間に、スイッチを介して抵抗を接続する。
【０００９】
【発明の実施の形態】
図１は本発明の通信装置における第1の実施の形態を示すブロック図である。図１において、電話機、ＦＡＸ等の端末装置３００は通信装置２００を介して、公衆網交換機４００に接続されている。
【００１０】
通信装置２００において、商用電源と接続される電源部１０は、商用電源から電圧変換する電源トランス２０の一次側と接続され、電源トランス２０の二次側は、端末装置３００に供給する電源（−４８Ｖ）や装置内で使用する電源を生成する電源回路部５０と接続されている。
【００１１】
端末装置３００とモジュラーコネクタ等で接続される端末部３０は、Ｔ１側は端末モニタ部８０経由で、Ｔ２側は直接切替回路部４０と接続されている。ここで、端末モニタ部８０は、端末装置３００の通話電流を監視する事でオンフック／オフフック情報やＤＰダイヤル情報を取り込み、 ＣＰＵ等から成る制御部１２０へ通知するものである。また、切替回路部４０は、端末装置３００に給電する電源を通信装置２００または公衆網交換機４００のどちらかに選択する為のリレー等で構成されている。
【００１２】
切替回路部４０は、切替に応じて、公衆網交換機４００とモジュラーコネクタ等で接続されている回線部７０または、切替回路部１６０と接続される。切替回路部１６０は、端末装置３００に給電する電源の極性を切替える為のリレー等で構成される。なお、切替回路部４０を第1の切替回路部、切替回路部１６０を第2の切替回路部とする。切替回路部１６０は電源回路部５０と接続される。
【００１３】
回線部７０は、公衆網交換機４００とのインピーダンス整合等の役目を果たす回線トランス６０の一次側と、直流ループ回路の開閉を行う直流ループ駆動部９０と、回線の極性を監視する回線モニタ部１００に接続される。回線トランス６０の二次側と電源回路部５０は、 ＤＴ等の各種トーンを検出／生成するトーン検出部１１１／トーン送出部１１２、ＤＴＭＦ信号の検出／生成するＤＴＭＦ検出部１１３／ＤＴＭＦ送出部１１４、ＬＣＲデータをダウンロード通信する場合に使用するモデム部１１５で構成されるＬＣＲ制御部１１０と接続される。
【００１４】
制御部１２０は、切替回路部４０、切替回路部１６０、端末モニタ部８０、直流ループ駆動部９０、回線モニタ部１００、ＬＣＲ制御部１１０、 ＬＣＤ・ＬＥＤ等から成る表示部１３０、スイッチ、キー等から成る操作部１４０、 ＲＯＭ、ＲＡＭ等から成るメモリ部１５０と接続されている。
【００１５】
次に、動作について説明する。
待機状態では、回線部７０にノーマル給電（Ｌ１側：−、Ｌ２側：＋）されており、端末部３０にも切替回路部４０および切替回路部１６０を経由してノーマル給電（Ｔ１側：−、Ｔ２側：＋）されている。
【００１６】
着信状態になると、回線部７０は公衆網交換機４００からの極性反転信号によりレバース給電（Ｌ１側：＋、Ｌ２側：−）になる。回線モニタ部１００は、極性反転を検出すると、制御部１２０へ極性反転を通知するための検出信号を送出する。制御部１２０は、検出信号を受けると、切替回路部１６０を切替える。そして、端末装置３００に対してレバース給電（Ｔ１側：＋、Ｔ２側：−）されると、制御部１２０は切替回路部４０を切替える。
【００１７】
従って切替回路部４０を切替える際に、端末装置３００の静電容量はレバース極性で充電されており、回線部７０と端末部３０の給電極性が一致するので、端末モニタ部８０や回線モニタ部１００、公衆網交換機４００に過渡電流が流れない。
【００１８】
このように、端末部３０の給電極性を自由に設定する事が出来ることで、着信状態移行時に発生する極性反転による給電極性不一致を解消できる。よって、着信状態移行時に端末モニタ部８０や回線モニタ部１００、公衆網交換機４００に過渡電流が流れる問題が解決でき、公衆網交換機４００の誤動作防止ができる。さらに、従来行っていた、過渡電流を防止するための一定時間監視しない処理が必要無いため、すぐに端末装置３００と公衆網交換機４００とをスルー状態にでき、処理時間の高速化が実現できる。
【００１９】
また、待機状態時に予め端末部３０の給電極性を切替回路部１６０で切替えてレバース給電（Ｔ１側：＋、Ｔ２側：−）にすると、着信状態になった場合に、切替回路部４０を切替えるのみで、上述と同じ効果を得られる。
【００２０】
図２は本発明の通信装置における第２の実施の形態を示すブロック図である。図２について、第1の実施例と異なる部分の構成について説明する。
【００２１】
通信装置２００において、端末部３０は、Ｔ１側は端末モニタ部８０経由で、Ｔ２側は直接切替回路部４０と接続され、さらにＴ１側にスイッチ１７０、Ｔ２側に抵抗１８０が接続されている。また、スイッチ１７０の切替によって、スイッチ１７０と抵抗１８０が接続される。切替回路部４０は切替えに応じて電源回路５０または回線部７０に接続される。
【００２２】
次に動作について、第１の実施例と異なる点を説明する。
着信状態になり、制御部１２０が極性反転の検出信号を受けると、スイッチ１７０を切替え、端末装置３００に対して抵抗１８０を終端させる。よって、端末部３０ではノーマル給電により充電されていた電荷が抵抗１８０に一旦放電する。その後、制御部１２０はスイッチ１７０を元に戻し、切替回路部４０を切替え、端末装置３００へリバース給電（Ｔ１側：＋、Ｔ２側：−）する。
【００２３】
このように、端末装置３００の静電容量により充電された電荷を抵抗１８０で一旦放電することで、端末モニタ部８０や回線モニタ部１００、公衆網交換機４００に流れる過渡電流を低減できる。よって、第１の実施例同様、公衆網交換機４００の誤動作防止および、処理時間の高速化が実現できる。
【００２４】
【発明の効果】
以上説明したように、本発明によると、 公衆網交換機と端末装置間に接続される通信装置において、電源回路と電源を選択する第１の切替回路との間に、給電極性を切り替えるための第２の切替回路を設けたことにより、第２の切替回路の動作に応じて公衆網交換機と端末装置の給電極性を一致させることができる。よって、過渡電流が発生しないため、公衆網交換機の誤動作が防止できる。さらに、従来行っていた、過渡電流を防止するための一定時間極性反転を監視しない処理を行う必要が無いため、処理の高速化が実現できる。
【００２５】
また端末装置と第１の切替回路との間に、スイッチを介して抵抗を接続したことにより、端末装置の電荷を一旦放電できる。よって、過渡電流を低減でき、公衆網交換機の誤動作が防止できる。さらに、従来の一定時間極性反転を監視しないという処理を行う必要が無いため、処理の高速化が実現できる。
【図面の簡単な説明】
【図１】本発明の通信装置における第1の実施の形態を示すブロック図である。
【図２】本発明の通信装置における第２の実施の形態を示すブロック図である。
【図３】従来の通信装置の構成を示すブロック図である。
【符号の説明】
３０ 端末部
４０ 切替回路部
５０ 電源回路部
７０ 回線部
８０ 端末モニタ部
１００ 回線モニタ部
１２０ 制御部
１６０ 切替回路部
１７０ スイッチ
１８０ 抵抗
２００ 通信装置
３００ 端末装置
４００ 公衆網交換機[0001]
[Industrial application fields]
The present invention relates to a communication device connected between a public network exchange and a terminal device such as a telephone / FAX and a connection control method for the communication device.
[0002]
[Prior art]
FIG. 3 is a block diagram showing a configuration of a conventional communication apparatus.
In the standby state, normal power is supplied to the line unit 70 from the public network switch 400 (L1 side:-, L2 side: +), and the terminal unit 30 is also normally supplied from the power supply circuit unit 50 (T1 side:-, T2 side: +). )
[0003]
When the incoming call state is entered, the line unit 70 changes to lever power supply (L1 side: +, L2 side-) by the polarity inversion signal from the public network switch 400. The line monitor unit 100 detects the polarity inversion signal due to the line voltage and notifies the control unit 120 of it. In the control unit 120, the switching circuit unit 40 is switched in order to place the line unit 70 and the terminal unit 30 in a through state. Therefore, the incoming signal from the public network switch 400 is connected to the terminal device 300.
[0004]
In the outgoing state, the off-hook state from the terminal device 300 is detected by the terminal monitor unit 80 monitored by the call current and notified to the control unit 120. The control unit 120 transmits a DT sound from the tone transmission unit 112, confirms the DT sound with the terminal device 300, and then transmits a dial number. The dial number is detected by the terminal monitor unit 80 in the case of DP and by the DTMF detection unit 113 in the case of PB. The control unit 120 closes the DC loop circuit with respect to the DC loop driving unit 90 that controls the opening and closing of the DC loop circuit for the transmission operation, and the tone detection unit 111 detects the DT sound from the public network switch 400. To do. Thereafter, a dial number with an LCR number added is transmitted from the DC loop driving unit 90 in the case of DP and from the DTMF transmission unit 114 in the case of PB. In response to this, a ringback tone is transmitted from the public network switch 400, and when a partner response is detected, a polarity inversion signal is transmitted from the public network switch 400. The following connection operation is the same as when the incoming state is entered.
[0005]
[Problems to be solved by the invention]
However, in the conventional communication device, when the standby state is shifted to the incoming state, the line unit 70 and the terminal unit 30 have separate power supply polarities, so the polarity before the incoming signal sent from the public network switch 400 Due to the inversion signal, the power feeding polarities of the line unit 70 and the terminal unit 30 are reversed. Therefore, when the switching circuit unit 40 makes a through state between the line unit 70 and the terminal unit 30 under the control of the control unit 120, the terminal unit 30 temporarily stores the electric charge charged in the capacitance inside the terminal device 300 until then. Discharged and charged. For this reason, a transient current flows through the terminal monitor unit 80, the line monitor unit 100, and the public network exchange 400, causing a response error detection of the terminal device 300.
[0006]
Further, in order to prevent a transient current from flowing, there is a method in which polarity reversal is not monitored for a certain period of time. However, the processing time becomes long, which is not technically satisfactory.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a communication device connected between a public network switch and a terminal device, a power supply circuit for supplying current, a power supply for the terminal device, and a power supply circuit for the communication device. Or a switch circuit for selecting whether to use the public network switch, and a resistor is connected between the terminal device and the switch circuit via a switch .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing a first embodiment of a communication apparatus according to the present invention. In FIG. 1, a terminal device 300 such as a telephone or FAX is connected to a public network switch 400 via a communication device 200.
[0010]
In the communication device 200, the power supply unit 10 connected to the commercial power source is connected to the primary side of the power transformer 20 that converts the voltage from the commercial power source, and the secondary side of the power transformer 20 is a power source (− 48V) and a power supply circuit unit 50 for generating a power supply used in the apparatus.
[0011]
The terminal unit 30 connected to the terminal device 300 by a modular connector or the like is connected to the T1 side via the terminal monitor unit 80 and directly to the switching circuit unit 40 on the T2 side. Here, the terminal monitor unit 80 captures on-hook / off-hook information and DP dial information by monitoring the call current of the terminal device 300, and notifies the control unit 120 including a CPU or the like. In addition, the switching circuit unit 40 is configured by a relay or the like for selecting a power supply for supplying power to the terminal device 300 to either the communication device 200 or the public network switch 400.
[0012]
The switching circuit unit 40 is connected to the line unit 70 or the switching circuit unit 160 connected to the public network switch 400 by a modular connector or the like according to switching. The switching circuit unit 160 is configured by a relay or the like for switching the polarity of the power source that supplies power to the terminal device 300. The switching circuit unit 40 is a first switching circuit unit, and the switching circuit unit 160 is a second switching circuit unit. The switching circuit unit 160 is connected to the power supply circuit unit 50.
[0013]
The line unit 70 includes a primary side of a line transformer 60 that performs impedance matching with the public network switch 400, a DC loop driving unit 90 that opens and closes a DC loop circuit, and a line monitor unit 100 that monitors the polarity of the line. Connected to. The secondary side of the line transformer 60 and the power supply circuit unit 50 include a tone detection unit 111 / tone transmission unit 112 that detects / generates various tones such as DT, and a DTMF detection unit 113 / DTMF transmission unit 114 that detects / generates a DTMF signal. , Connected to the LCR control unit 110 configured by the modem unit 115 used when LCR data is downloaded and communicated.
[0014]
The control unit 120 includes a switching circuit unit 40, a switching circuit unit 160, a terminal monitoring unit 80, a DC loop driving unit 90, a line monitoring unit 100, an LCR control unit 110, a display unit 130 including an LCD / LED, a switch, a key, and the like. Are connected to an operation unit 140 comprising a memory unit 150 comprising a ROM, a RAM and the like.
[0015]
Next, the operation will be described.
In the standby state, the normal power supply to the line portion 70 (L1 side: -, L2 side: +) to which the normal power supply via the switching circuit section 40 and the switching circuit portion 1 6 0 to the terminal portion 30 (T1 side :-, T2 side: +).
[0016]
In the incoming state, the line unit 70 is reversed by the polarity inversion signal from the public network switch 400 (L1 side: +, L2 side:-). When the line monitor unit 100 detects the polarity reversal, it sends a detection signal for notifying the control unit 120 of the polarity reversal. When receiving the detection signal, the control unit 120 switches the switching circuit unit 160. When lever power is supplied to the terminal device 300 (T1 side: +, T2 side:-), the control unit 120 switches the switching circuit unit 40.
[0017]
Therefore, when the switching circuit unit 40 is switched, the electrostatic capacity of the terminal device 300 is charged with the lever polarity, and the power feeding polarities of the line unit 70 and the terminal unit 30 match, so that the terminal monitor unit 80 and the line monitor unit 100 No transient current flows through the public network switch 400.
[0018]
As described above, since the power supply polarity of the terminal unit 30 can be set freely, it is possible to eliminate power supply polarity mismatch due to polarity reversal that occurs during the incoming state transition. Therefore, it is possible to solve the problem that a transient current flows through the terminal monitor unit 80, the line monitor unit 100, and the public network switch 400 when the incoming call state is changed, and to prevent malfunction of the public network switch 400. Furthermore, since there is no need for a conventional process that does not monitor for a certain period of time to prevent a transient current, the terminal device 300 and the public network switch 400 can be immediately put into a through state, and the processing time can be increased.
[0019]
In addition, when the power supply polarity of the terminal unit 30 is switched in advance by the switching circuit unit 160 in the standby state to make the lever power supply (T1 side: +, T2 side:-), the switching circuit unit 40 is switched in the incoming state. Only with this, the same effect as described above can be obtained.
[0020]
FIG. 2 is a block diagram showing a second embodiment of the communication apparatus of the present invention. With reference to FIG. 2, the configuration of a portion different from the first embodiment will be described.
[0021]
In the communication device 200, the terminal unit 30 is connected to the T1 side via the terminal monitor unit 80, directly connected to the switching circuit unit 40 on the T2 side, and further connected to a switch 170 on the T1 side and a resistor 180 on the T2 side. Further, the switch 170 and the resistor 180 are connected by switching the switch 170. The switching circuit unit 40 is connected to the power supply circuit 50 or the line unit 70 in accordance with the switching.
[0022]
Next, the operation will be described while referring to differences from the first embodiment.
When the incoming state is reached and the control unit 120 receives the polarity inversion detection signal, the switch 170 is switched to terminate the resistor 180 for the terminal device 300. Therefore, the charge that has been charged by the normal power supply in the terminal unit 30 is once discharged to the resistor 180. Thereafter, the control unit 120 restores the switch 170, switches the switching circuit unit 40, and reversely feeds power to the terminal device 300 (T1 side: +, T2 side:-).
[0023]
As described above, by temporarily discharging the charge charged by the capacitance of the terminal device 300 with the resistor 180, the transient current flowing in the terminal monitor unit 80, the line monitor unit 100, and the public network switch 400 can be reduced. Therefore, as in the first embodiment, it is possible to prevent malfunction of the public network exchange 400 and increase the processing time.
[0024]
【The invention's effect】
As described above, according to the present invention, in the communication device connected between the public network switch and the terminal device, the power supply polarity is switched between the power supply circuit and the first switching circuit for selecting the power supply. By providing two switching circuits, it is possible to match the power feeding polarities of the public network switch and the terminal device according to the operation of the second switching circuit. Therefore, since a transient current does not occur, it is possible to prevent malfunction of the public network switch. Furthermore, since it is not necessary to perform a process that does not monitor polarity reversal for a certain period of time in order to prevent a transient current, a high-speed process can be realized.
[0025]
In addition, since the resistor is connected between the terminal device and the first switching circuit via the switch, the charge of the terminal device can be discharged once. Therefore, transient current can be reduced and malfunction of the public network exchange can be prevented. Furthermore, since it is not necessary to perform the conventional process of not monitoring the polarity reversal for a certain period of time, it is possible to increase the processing speed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of a communication apparatus according to the present invention.
FIG. 2 is a block diagram showing a second embodiment of the communication apparatus of the present invention.
FIG. 3 is a block diagram showing a configuration of a conventional communication apparatus.
[Explanation of symbols]
30 terminal unit 40 switching circuit unit 50 power supply circuit unit 70 line unit 80 terminal monitor unit 100 line monitor unit 120 control unit 160 switching circuit unit 170 switch 180 resistor 200 communication device 300 terminal device 400 PSTN switch

Claims (3)

公衆網交換機と端末装置間に接続される通信装置において、
電流を供給する電源回路部と、
前記端末装置の電源を、前記通信装置の前記電源回路部とするかまたは前記公衆網交換機とするかを選択する切替回路部とを有し、
前記端末装置と前記切替回路部との間に、スイッチを介して抵抗を接続したことを特徴とする通信装置。In a communication device connected between a public network switch and a terminal device,
A power supply circuit section for supplying current;
A switching circuit unit that selects whether the power supply of the terminal device is the power supply circuit unit of the communication device or the public network switch;
A communication device, wherein a resistor is connected between the terminal device and the switching circuit unit via a switch. 前記通信装置と前記公衆網交換機とを接続する回線の極性反転を検出し、検出信号を送信する回線モニタ部と、
前記検出信号の受信に応じて、前記スイッチの切替を指示し、前記切替回路部に、前記公衆網交換機との接続を指示する制御部とを有することを特徴とする請求項１に記載の通信装置。Detecting a polarity reversal of a line connecting the communication apparatus and the public network switch, and transmitting a detection signal;
In response to receiving the detection signal, and instructs the switching of the switch, the switching circuit portion, a communication according to claim 1, characterized in that a control unit for instructing the connection to the public network exchange apparatus. 公衆網交換機と端末装置間に接続される通信装置の接続制御方法において、
前記通信装置と前記公衆網交換機との接続点である回線部における極性反転を検出した際に、前記端末装置に抵抗を接続し、
前記端末装置の電荷を放電した後、前記抵抗を切断し、
前記端末装置の電源を、前記通信装置内の電源回路部から前記公衆網交換機へ切替える
ことを特徴とする通信装置の接続制御方法。In a connection control method for a communication device connected between a public network switch and a terminal device,
When detecting a polarity reversal in the line unit that is a connection point between the communication device and the public network switch, a resistor is connected to the terminal device,
After discharging the terminal device charge, the resistor is disconnected,
A communication device connection control method, wherein the power supply of the terminal device is switched from a power supply circuit unit in the communication device to the public network exchange.
JP2000104723A 2000-04-06 2000-04-06 COMMUNICATION DEVICE AND COMMUNICATION DEVICE CONNECTION CONTROL METHOD Expired - Fee Related JP4130863B2 (en)

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