JPH03201758A - Urgent simultaneous notice equipment by telephone network - Google Patents

Urgent simultaneous notice equipment by telephone network

Info

Publication number
JPH03201758A
JPH03201758A JP34031389A JP34031389A JPH03201758A JP H03201758 A JPH03201758 A JP H03201758A JP 34031389 A JP34031389 A JP 34031389A JP 34031389 A JP34031389 A JP 34031389A JP H03201758 A JPH03201758 A JP H03201758A
Authority
JP
Japan
Prior art keywords
notification
emergency
notice
emergency notification
storage device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP34031389A
Other languages
Japanese (ja)
Other versions
JP2600938B2 (en
Inventor
Yasuyoshi Marufuji
丸藤 康芳
Hiroshi Sato
浩 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP34031389A priority Critical patent/JP2600938B2/en
Publication of JPH03201758A publication Critical patent/JPH03201758A/en
Application granted granted Critical
Publication of JP2600938B2 publication Critical patent/JP2600938B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To attain emergency notification by utilizing a subscriber line of a subscriber telephone network installed over a wide area so as to inform an urgent notice through simultaneous sounding from plural speakers connected by multiple connection function of a digital telephone exchange. CONSTITUTION:A subscriber telephone network covering an entire notice object party area is utilized for a notice communication network and the content of urgent notice is stored in a notice content storage device 3. An emergent notice commanding party dials a special number on emergency to apply multiple connection of subscriber lines 41-4n of emergency notice reception subscribers in which speakers 11-1n are installed to the notice content storage device 3 via an exchange network and the emergency notice content stored in the notice content storage device 3 or the voice uttered by the emergency notice commanding party is sounded from the speakers 11-1n. Thus, the object of emergency notice is sufficiently fulfilled.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、地震発生時等の緊急時に多数の通知対象者に
一斉に緊急通知する装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device that simultaneously notifies a large number of recipients of an emergency in the event of an emergency such as an earthquake.

[従来の技術] 従来、地震発生時等の緊急時に、多数の通知対象者に一
斉に緊急通知を行なう場合、テレビ、ラジオ等のマスメ
ディアを使用したり、あるいは有線放送システムを使用
していた。前者のマスメディアを使用する方式では通知
対象者側に受信装置を準備し、かつ受信状態にスイッチ
を設定することにより通知を受けることが可能となる。
[Conventional technology] Conventionally, in the event of an emergency such as an earthquake, mass media such as television and radio, or a cable broadcasting system, was used to notify a large number of recipients at the same time. . In the former method using mass media, it is possible to receive notifications by preparing a receiving device on the side of the person to be notified and setting a switch to the receiving state.

すなわち緊急一斉通知の内容は通知対象者側の状態に依
存されることなく通知される必要があるにもかかわらず
、通知対象者側が受信状態に自らが設定していなければ
通知されないことになる。有線放送システムにおいては
その設備がある地域のみに限られる。
In other words, although the contents of the emergency simultaneous notification need to be notified without depending on the status of the recipients of notification, the notification will not be made unless the recipients of the notification set themselves to a receiving state. Cable broadcasting systems are limited to areas where the equipment is available.

[発明が解決しようとする課題] 上述した従来の緊急通知方式のうち、マスメディアを使
用する方式は受信側で受信装置を受信可能状態にしてい
なければならず、また有線放送システムを使用する方式
ではその地域が限られており、緊急通知の目的が十分達
せられないという欠点がある。
[Problems to be Solved by the Invention] Among the conventional emergency notification methods mentioned above, the method using mass media requires that the receiving device be in a receiving state on the receiving side, and the method using a cable broadcasting system However, the disadvantage is that the area is limited and the purpose of emergency notification cannot be fully achieved.

[課題を解決するための手段] 本発明の電話網による緊急一斉通知装置は、全ての通知
対象者に緊急通知を行なうように設置された複数台のス
ピーカと、 各スピーカ毎に設けられ、加入者回路により交換機のネ
ットワークに収容され、緊急時加入者回線を経由して転
送されてくる制御信号を受信して当該スピーカをオン状
態にして加入者回線上の音声信号を拡声するスピーカ制
御装置と、緊急通知内容を予め蓄積しており、制御信号
を受信して緊急通知内容を出力したり、出力を停止する
機能とともに、音声信号を入力して出力する機能を有す
る通知内容蓄積装置と、 緊急通知指示者の加入者端末に接続され、通知内容蓄積
装置に対して緊急通知指示者の指示により制御信号を送
出したり、緊急通知指示者の入力した音声信号を出力す
る通知指示制御装置と、緊急通知受信者の電話番号を記
憶しており、該緊急通知指示者が予め決められている特
殊番号をダイヤルすると、該発信呼を通知内容蓄積装置
へ接続し、該通知内容蓄積装置の出力側に対して、全て
の緊急通知受信者の加入者回線を多重接続する電話交換
機とを有している。
[Means for Solving the Problems] The emergency notification device using the telephone network of the present invention includes a plurality of speakers installed so as to send an emergency notification to all notification targets, and a subscriber installed for each speaker. a speaker control device that is accommodated in the network of the exchange by a subscriber circuit, receives a control signal transferred via the subscriber line in an emergency, turns on the speaker, and amplifies the audio signal on the subscriber line; , a notification content storage device that stores emergency notification content in advance and has a function of receiving a control signal to output or stop outputting the emergency notification content, as well as a function of inputting and outputting an audio signal; a notification instruction control device that is connected to a subscriber terminal of a notification instructor and sends a control signal to the notification content storage device according to an instruction from the emergency notification instructor or outputs an audio signal input by the emergency notification instructor; The telephone number of the emergency notification recipient is stored, and when the emergency notification instructor dials a predetermined special number, the outgoing call is connected to the notification content storage device, and the output side of the notification content storage device is In contrast, it has a telephone exchange that connects the subscriber lines of all emergency notification recipients in multiple ways.

[作 用] 本発明は、通知のための通信網として通知対象者地域全
域をカバーしている加入者電話網を利用し、通知内容蓄
積装置に緊急通知内容を蓄積しておき、緊急時、緊急通
知指示者が特殊番号をダイヤルすることにより、スピー
カが設置されている緊急通知受信加入者の加入者回線を
交換網を介して通知内容蓄積装置に多重接続し、通知内
容蓄積装置に蓄積されている緊急通知内容あるいは緊急
通知指示者が発した音声をスピーカにより放声するよう
にしたものである。
[Function] The present invention utilizes a subscriber telephone network that covers the entire area of notification recipients as a communication network for notification, stores emergency notification contents in a notification contents storage device, and, in the event of an emergency, When the emergency notification instructor dials a special number, the subscriber line of the emergency notification receiving subscriber where the speaker is installed is multiplexed to the notification content storage device via the switching network, and the notification content storage device The content of the emergency notification or the voice uttered by the person instructing the emergency notification is emitted by a speaker.

[実施例コ 次に、本発明の実施例について図面を参照して説明する
[Embodiments] Next, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明の電話網による緊急一斉通知装置の一実
施例の中継方式図である。
FIG. 1 is a relay system diagram of an embodiment of an emergency simultaneous notification device using a telephone network according to the present invention.

ディジタルネットワーク5、ネットワーク制御装置13
、中央制御装置14、主記憶装置15、レジスタ8を含
むディジタル交換機11のディジタルネットワーク5に
は緊急通知指示者Aおよび緊急通知対象者の中の特定の
加入者(以下緊急通知受信加入者と記す)B、、B2.
−、Bnがそれぞれ加入者回路4゜、4..42.−.
4.により収容されている。緊急通知受信加入者B、、
B2゜+** 、 B nの加入回線10. 、10□
、−、10nにはスピーカ制御装置2 l、22.””
、2nとスピーカ1、.12.・−、inが接続されて
いる。スピーカ制御装置21〜2oは、通常はオフ状態
になっているが、加入者回線101〜10nを経由して
制御信号を受信するとそれぞれの加入者回線10.〜1
0rlを保持し、スピーカ1□〜1oをオン状態とし、
加入者回線10□〜lOnを介して受信した音声を拡声
する。ディジタル交換機11のディジタルネットワーク
5には入力端と出力側がそれぞれ出トランク121.入
トランク122を介して接続された通知内容蓄積装置3
が収容されている。この通知内容蓄積装置3は記憶部9
と制御部7とからなり、記憶部9には緊急通知内容が予
め蓄積されており、制御部7は制御信号により通知内容
を出力したり、その出力を停止する機能とともに音声信
号を入力して出力する機能と、スピーカ制御装置2、〜
2nに制御信号を出力する機能を有している。緊急通知
指示者Aの加入者回線10゜には通知指示制御装置6が
接続されており、通知内容蓄積装置3に対して緊急通知
指示者Aの指示により制御信号を送出したり、緊急通知
指示者Aが人力した音声信号を出力する。ディジタル交
換機11の主記憶装置15には緊急通知受信加入者B、
−B、の電話番号が格納されている。緊急通知指示者A
の加入者端末からのダイヤル信号がレジスタ8で受信さ
れると、中央制御装置14によりそのダイヤル信号が解
析され、それが予め決められている緊急通知を指示する
特殊番号であると判定されると、ネットワーク制御装置
13の制御によって、緊急通知指示者Aの発信呼は通知
内容蓄積装置3の入力端へ、また全緊急通知受信者81
〜Bnの加入者1/s10.〜10.は通知内容蓄積装
置3の出力側へディジタルネットワーク5を介して接続
される。
Digital network 5, network control device 13
, a central controller 14, a main memory 15, and a register 8. The digital network 5 of the digital exchange 11 includes an emergency notification instructor A and a specific subscriber among emergency notification recipients (hereinafter referred to as emergency notification receiving subscriber). )B,,B2.
-, Bn are subscriber circuits 4°, 4. .. 42. −.
4. It is accommodated by. Emergency notification recipient B...
B2゜+**, Bn subscriber line 10. , 10□
, -, 10n have speaker control devices 2l, 22. ””
, 2n and speaker 1, . 12. -, in is connected. The speaker control devices 21 to 2o are normally in an off state, but when receiving a control signal via the subscriber lines 101 to 10n, the speaker control devices 21 to 2o switch to the respective subscriber lines 10. ~1
Hold 0rl and turn on speakers 1□ to 1o.
The voice received via the subscriber lines 10□ to lOn is amplified. The digital network 5 of the digital exchange 11 has an input end and an output end, respectively, as output trunks 121. Notification content storage device 3 connected via incoming trunk 122
is accommodated. This notification content storage device 3 is a storage section 9
and a control section 7, the emergency notification contents are stored in advance in the storage section 9, and the control section 7 has the function of outputting the notification contents according to the control signal and stopping the output, as well as inputting the audio signal. Output function and speaker control device 2, ~
It has a function of outputting a control signal to 2n. A notification instruction control device 6 is connected to the subscriber line 10° of the emergency notification instructor A, and sends a control signal to the notification content storage device 3 according to instructions from the emergency notification instructor A, and sends out emergency notification instructions. Person A outputs a human-generated audio signal. The main storage device 15 of the digital exchange 11 stores emergency notification receiving subscriber B,
-B's telephone number is stored. Emergency notification instructor A
When the register 8 receives a dial signal from a subscriber terminal, the central controller 14 analyzes the dial signal and determines that it is a special number instructing a predetermined emergency notification. , under the control of the network control device 13, the emergency notification instructor A's outgoing call is sent to the input terminal of the notification content storage device 3, and all emergency notification recipients 81
~Bn subscriber 1/s10. ~10. is connected to the output side of the notification content storage device 3 via a digital network 5.

次に、本実施例の動作を説明する。Next, the operation of this embodiment will be explained.

地震発生時等、緊急時に多数の通知対象者に一斉、同時
に緊急通知を行なう必要性のある事態が発生した時、緊
急通知指示者Aは電話機をオフフックし緊急通知用特殊
番号をダイヤルする。
When an emergency situation such as an earthquake occurs in which it is necessary to notify a large number of notification recipients at the same time, an emergency notification instructing person A takes off-hook the telephone and dials a special number for emergency notification.

ディジタル電話交換機11では緊急通知指示者Aがオフ
フックした時に公知のDT後接続て加入者Aとレジスタ
8を接続する。その後レジスタ8で受信したダイヤル信
号を解析して緊急通知呼であることを識別し、加入者A
とレジスタ8との接続を加入者Aと通知内容蓄積装置3
の入力端子との接続に切り替える。また、同時に通知内
容蓄積装置3と緊急通知受信加入者B、〜Bnとの間を
接続する。この時通知内容蓄積装置3の出力端子は複数
の緊急通知受信加入者81〜Bnと同時に多重接続され
る。ディジタルネットワーク5において第1図に示され
る多重接続では通知内容蓄積装置3の出力端子からの信
号は同時に接続されている相手側に伝達されることとな
る。なお、この緊急通知接続時に緊急通信受信加入者B
□〜B、が通常の話中状態となっている場合があるが、
ディジタル電話交換機11では緊急通知呼であることを
認知しているので該話中状態を強制的に解除し緊急通知
接続処理を行なう。上述の接続が完了したことで緊急通
知指示者Aは通知指示制御装置6より緊急通知の送出指
示を行なう。
In the digital telephone exchange 11, when the emergency notification instructor A goes off-hook, the subscriber A and the register 8 are connected by a known post-DT connection. After that, register 8 analyzes the dial signal received and identifies that it is an emergency notification call, and subscriber A
and register 8 are connected to subscriber A and notification content storage device 3.
Switch to connect to the input terminal. At the same time, the notification content storage device 3 and the emergency notification receiving subscribers B, -Bn are connected. At this time, the output terminal of the notification content storage device 3 is multiplex-connected simultaneously to a plurality of emergency notification receiving subscribers 81 to Bn. In the multiple connection shown in FIG. 1 in the digital network 5, the signals from the output terminal of the notification content storage device 3 are simultaneously transmitted to the connected party. In addition, when this emergency notification is connected, emergency communication receiving subscriber B
□~B may be in the normal busy state,
Since the digital telephone exchange 11 recognizes that it is an emergency notification call, it forcibly cancels the busy state and performs emergency notification connection processing. With the above connection completed, the emergency notification instructor A instructs the notification instruction control device 6 to send an emergency notification.

通知指示制御装置6からの制御信号はディジタルネット
ワーク5を介して通知内容蓄積装置の制御部7に伝達さ
れ、制御部7では指示を受けて緊急通知受信加入者81
〜Bnに接続されているスピーカ制御装置21〜2nに
対しスピーカ11〜1oのオン指示をディジタルネット
ワーク5を介して一斉同時に行なう。しかるのち、記憶
部9に蓄積されている緊急通知内容を送出し、スピーカ
11〜!。によって拡声され、通知対象者に自動的に通
知内容が伝達されることになる。また1発生した緊急事
態によっては、あらかじめ蓄積されている通知内容では
不充分のため事態に対応した適切な通知を必要とする場
合が発生する。この場合、緊急通知指示者Aは通知内容
蓄積装置3との接続後、蓄積内容の通知ではなく入力端
子からの音声を送出する制御信号を通知内容蓄積装置3
に送出する。制御部7は該制御信号を受信して音声回路
を出力端子へ接続する。この制御により通知内容は緊急
通知指示者Aの端末から人力された音声となる。ディジ
タル電話交換機11と緊急通知指示者Aおよび緊急通信
受信加入者81〜Bnを接続する加入者回路10o〜1
0nは既存の加入者電話網として設備されたものであり
、スピーカ11〜1nおよびスピーカ制御装置21〜2
nは加入者端末近くの屋外に設置してその拡声機能が有
効となるように設備される。
The control signal from the notification instruction control device 6 is transmitted via the digital network 5 to the control section 7 of the notification content storage device, and the control section 7 receives the instruction and sends the emergency notification receiving subscriber 81
-Bn are simultaneously instructed to turn on the speakers 11-1o to the speaker control devices 21-2n connected to the speakers 11-1o via the digital network 5. After that, the emergency notification content stored in the storage unit 9 is sent out, and the speaker 11~! . The notification will be amplified and the contents of the notification will be automatically transmitted to the person to be notified. Furthermore, depending on the emergency situation that has occurred, the notification contents stored in advance may be insufficient and appropriate notifications corresponding to the situation may be required. In this case, after connecting with the notification content storage device 3, the emergency notification instructor A sends a control signal to the notification content storage device 3 to send out a voice from the input terminal instead of a notification of the stored content.
Send to. The control section 7 receives the control signal and connects the audio circuit to the output terminal. Through this control, the content of the notification becomes a human voice input from the terminal of the emergency notification instructor A. Subscriber circuits 10o to 1 that connect the digital telephone exchange 11 to the emergency notification instructor A and the emergency communication receiving subscribers 81 to Bn
0n is installed as an existing subscriber telephone network, and speakers 11 to 1n and speaker control devices 21 to 2
n is installed outdoors near subscriber terminals so that its amplification function is effective.

[発明の効果] 以上説明したように本発明は、広域にわたって分布され
ている緊急通知対象者に対する緊急通知を広域にわたっ
て設備された加入者電話網の加入者線を利用し、ディジ
タル電話交換機の多重接続機能により接続された複数の
スピーカから一斉、同時に放声して通知することにより
、緊急通知対象者側の設備条件・受信条件によらず緊急
通知の目的を達成できるという効果がある。
[Effects of the Invention] As explained above, the present invention utilizes subscriber lines of a subscriber telephone network installed over a wide area to send emergency notifications to persons to whom emergency notifications are distributed over a wide area, and uses multiplexing of digital telephone exchanges. By broadcasting the notification simultaneously from multiple speakers connected by the connection function, the purpose of the emergency notification can be achieved regardless of the equipment conditions and reception conditions of the recipient of the emergency notification.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の電話網による緊急一斉通知装置の一実
施例の中継方式図である。 11〜1n・・・スピーカ、 2、〜2o・・・スピーカ制御装置、 3・・・通知内容蓄積装置、 4I〜4n−・・加入者回線、 5・・・ディジタルネットワーク、 6・・・通知指示制御装置、 7・・・制御部、 8・・・レジスタ、 9・・・記憶部、 10゜〜10n−・・加入者回線、 11−・・ディジタル交換機、 12、−・・出トランク、 122−・・人トランク、 13−・・ネットワーク制御装置、 14・・・中央制御装置、 15・・・主記憶装置。
FIG. 1 is a relay system diagram of an embodiment of an emergency simultaneous notification device using a telephone network according to the present invention. 11-1n...Speaker, 2, -2o...Speaker control device, 3...Notification content storage device, 4I-4n-...Subscriber line, 5...Digital network, 6...Notification Instruction control device, 7...Control unit, 8...Register, 9...Storage unit, 10° to 10n--Subscriber line, 11--Digital exchange, 12,--Outgoing trunk, 122--Person trunk, 13--Network control device, 14--Central control device, 15--Main storage device.

Claims (1)

【特許請求の範囲】 1、地震発生時等の緊急時に、多数の通知対象者にディ
ジタル電話交換機を介して緊急通知を一斉に行なう緊急
一斉通知装置であって、 全ての通知対象者に緊急通知を行なうように設置された
複数台のスピーカと、 各スピーカ毎に設けられ、加入者回路により交換機のネ
ットワークに収容され、緊急時加入者回線を経由して転
送されてくる制御信号を受信して当該スピーカをオン状
態にして加入者回線上の音声信号を拡声するスピーカ制
御装置と、 緊急通知内容を予め蓄積しており、制御信号を受信して
緊急通知内容を出力したり、出力を停止する機能ととも
に、音声信号を入力して出力する機能を有する通知内容
蓄積装置と、 緊急通知指示者の加入者端末に接続され、通知内容蓄積
装置に対して緊急通知指示者の指示により制御信号を送
出したり、緊急通知指示者の入力した音声信号を出力す
る通知指示制御装置と、緊急通知受信者の電話番号を記
憶しており、該緊急通知指示者が予め決められている特
殊番号をダイヤルすると、該発信呼を通知内容蓄積装置
へ接続し、該通知内容蓄積装置の出力側に対して、全て
の緊急通知受信者の加入者回線を多重接続する電話交換
機とを有する電話網による緊急一斉通知装置。
[Scope of Claims] 1. An emergency simultaneous notification device that simultaneously sends an emergency notification to a large number of notification recipients via a digital telephone exchange in the event of an emergency such as an earthquake, which provides emergency notification to all notification recipients at once. It is equipped with multiple speakers installed for each speaker, and is accommodated in the network of the exchange by a subscriber circuit, and receives control signals transferred via the emergency subscriber line. A speaker control device that turns on the speaker and amplifies the audio signal on the subscriber line; and a speaker control device that stores emergency notification contents in advance and outputs or stops outputting the emergency notification contents upon receiving a control signal. A notification content storage device that has the function of inputting and outputting audio signals as well as the function of inputting and outputting audio signals is connected to the subscriber terminal of the emergency notification instructor, and sends control signals to the notification content storage device according to the instructions of the emergency notification instructor. and a notification instruction control device that outputs the audio signal input by the emergency notification instructor and the telephone number of the emergency notification recipient, and when the emergency notification instructor dials a predetermined special number. , emergency notification by a telephone network that connects the outgoing call to a notification content storage device, and has a telephone exchange that multiplex connects subscriber lines of all emergency notification recipients to the output side of the notification content storage device. Device.
JP34031389A 1989-12-28 1989-12-28 Emergency simultaneous notification device via telephone network Expired - Lifetime JP2600938B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34031389A JP2600938B2 (en) 1989-12-28 1989-12-28 Emergency simultaneous notification device via telephone network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34031389A JP2600938B2 (en) 1989-12-28 1989-12-28 Emergency simultaneous notification device via telephone network

Publications (2)

Publication Number Publication Date
JPH03201758A true JPH03201758A (en) 1991-09-03
JP2600938B2 JP2600938B2 (en) 1997-04-16

Family

ID=18335753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34031389A Expired - Lifetime JP2600938B2 (en) 1989-12-28 1989-12-28 Emergency simultaneous notification device via telephone network

Country Status (1)

Country Link
JP (1) JP2600938B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004015972A1 (en) * 2002-08-07 2004-02-19 Allied Telesis K.K. Sound communication system and method thereof
US7301450B2 (en) 2006-03-14 2007-11-27 John Carrino Citizen communication center

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004015972A1 (en) * 2002-08-07 2004-02-19 Allied Telesis K.K. Sound communication system and method thereof
US7310328B2 (en) 2002-08-07 2007-12-18 Allied Telesis K.K. Voice communication system and its method
US7301450B2 (en) 2006-03-14 2007-11-27 John Carrino Citizen communication center

Also Published As

Publication number Publication date
JP2600938B2 (en) 1997-04-16

Similar Documents

Publication Publication Date Title
JPH0697773B2 (en) Telephone
JPS60248057A (en) Voice storage exchange system
JPH03201758A (en) Urgent simultaneous notice equipment by telephone network
JPS60149254A (en) Information transmission system
US5157715A (en) Call status recognition in a broadband private automatic branch exchange
JPS6248169A (en) Information notice system
KR100200070B1 (en) Exchange broadcasting method
JP2927276B2 (en) Remote subscriber audio monitoring
JP2758011B2 (en) Emergency call line hold control method
JP2646531B2 (en) Voice broadcast system
JPH0332945B2 (en)
JP2002044262A (en) Circuit control device
JPS63280596A (en) Key telephone system
JPS6152055A (en) System for transmitting terminal control information
JPH01120992A (en) Key telephone set
JPS59154870A (en) Telephone exchange
JP2001268242A (en) Private branch exchange
JPS627296A (en) Data circuit connecting system
JPH02216945A (en) Call signal transmission system
JPH01186047A (en) Howler signal transmission system
JPH02274056A (en) Wire broadcast telephone system
JPS6130463B2 (en)
JPH05268367A (en) Command control signal system
JPH0353650A (en) Voice conference equipment
JPH0795297A (en) Private branch exchanger system