JP2997478B2 - Channel control method - Google Patents
Channel control methodInfo
- Publication number
- JP2997478B2 JP2997478B2 JP1107666A JP10766689A JP2997478B2 JP 2997478 B2 JP2997478 B2 JP 2997478B2 JP 1107666 A JP1107666 A JP 1107666A JP 10766689 A JP10766689 A JP 10766689A JP 2997478 B2 JP2997478 B2 JP 2997478B2
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- Prior art keywords
- signal
- line signal
- exchange
- common line
- common
- Prior art date
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- Monitoring And Testing Of Exchanges (AREA)
- Exchange Systems With Centralized Control (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、共通線信号方式を採用した電子交換機に係
り、特に呼接続制御のための制御信号を伝達する共通線
信号路が障害により使用不可能となった場合の個別線信
号制御による基本呼接続方式に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic exchange employing a common channel signaling system, and in particular, a common channel signaling path for transmitting a control signal for call connection control is used due to a failure. The present invention relates to a basic call connection method based on individual line signal control when it becomes impossible.
従来、共通線信号リンクの障害時対策としては特開昭
62−48175号公報に記載のように共通線信号方式を個別
線信号方式に切替えて制御する方式があった。Conventionally, as a countermeasure at the time of failure of the common line signal link,
As described in Japanese Patent Application Laid-Open No. 62-48175, there is a system in which a common line signal system is switched to an individual line signal system for control.
しかしながら、信号方式切替え制御に関する具体的な
実現手段については明確になっていなかった。However, specific means for realizing signal system switching control has not been clarified.
上記従来技術は信号リンク障害時の通話路制御方式を
共通線信号から個別線信号へ切替える方式であるもの
の、信号リンクの障害と障害復旧の認識方式，共通線信
号と個別線信号相互への切替え制御方式の点については
何ら配慮されていなかった。The above-mentioned prior art is a method of switching the communication path control method at the time of a signal link failure from a common line signal to an individual line signal. However, it recognizes a signal link failure and failure recovery, and switches between a common line signal and an individual line signal. No consideration was given to the control method.
本発明の目的は、信号リンク障害の認識と共通線信号
制御から個別線信号制御への自動切替え、および信号リ
ンク障害復旧の認識と個別線信号制御から共通線信号制
御への自動切替えについて具体的な実現方式を確立し、
信号リンク障害時の通話回線を有効に利用するものであ
る。An object of the present invention is specifically for recognition of signal link failure and automatic switching from common line signal control to individual line signal control, and recognition of signal link failure recovery and automatic switching from individual line signal control to common line signal control. Establish a realization method,
It effectively utilizes the communication line at the time of a signal link failure.
上記目的は、通話路に接続される通話用トランクと、
共通線信号路に接続される共通線信号処理装置と、前記
通話用トランクと接続され回線のスイッチを行う交換ス
イッチとを有する第１及び第２の交換局を有する通信シ
ステムの通信路制御方法において、前記第２の交換局か
ら前記第１の交換局に接続される端末へ発信出接続を行
う場合、前記第２の交換局は、前記共通線信号処理装置
から前記共通線信号路に共通線信号を送出すると共に、
前記通話用トランクから前記通話路に起動信号を送出
し、前記共通線信号及び前記起動信号を受信する前記第
１の交換局においては、前記共通線信号処理装置を介し
て受信した共通線信号による共通線信号リンクが正常で
ある場合、前記通話用トランクを介して受信する前記第
２の交換局からの個別信号を無効とし、前記共通線信号
を受信分析することで交換接続を行い、一方、前記共通
線信号及び前記起動信号を受信する前記第１の交換局に
おいては、前記共通線信号処理装置を介して受信した共
通線信号による共通線信号リンクが正常である場合、前
記通話用トランクを介して受信する個別信号を有効化す
ることで、交換接続を行うにより達成される。The above object is to provide a call trunk connected to a call path,
A communication path control method for a communication system having first and second exchanges, comprising a common line signal processing device connected to a common line signal path, and an exchange switch connected to the communication trunk and switching a line. When an outgoing connection is made from the second exchange to a terminal connected to the first exchange, the second exchange exchanges a common line from the common line signal processor to the common line signal path. Sends out a signal,
In the first switching center, which transmits an activation signal from the trunk for communication to the communication path and receives the common line signal and the activation signal, the first exchange uses the common line signal received through the common line signal processing device. When the common channel signal link is normal, the individual signal from the second switching center received via the communication trunk is invalidated, and the common channel signal is received and analyzed to perform a switching connection. In the first switching center receiving the common line signal and the activation signal, when the common line signal link by the common line signal received via the common line signal processing device is normal, the call trunk is disconnected. This is achieved by making a switched connection by enabling individual signals to be received via the connection.
通話路を用いての制御下（以下、個別線信号制御下）
においては、端末制御プログラムは交換処理プログラム
と論理的なインターフェイスを持ち、呼の状態に応じた
通話路を経由する制御信号（以下、個別線信号）を交換
処理プログラムからの指示により対向局へ送信する。ま
た対向局からの受信個別線信号は交換処理プログラムに
対する処理要求として連絡通知することで交換処理プロ
グラムは通話路を用いての制御（以下、個別線信号制
御）による交換サービスを行なう。Under control using a communication path (hereinafter, under individual line signal control)
In, the terminal control program has a logical interface with the exchange processing program, and transmits a control signal (hereinafter, individual line signal) passing through the communication path according to the state of the call to the opposite station according to an instruction from the exchange processing program. I do. In addition, the individual line signal received from the opposite station is notified and notified as a processing request to the exchange processing program, and the exchange processing program provides an exchange service by control using a communication path (hereinafter, individual line signal control).
本発明は、交換サービスを共通線信号路を用いての制
御方式（以下、共通線信号方式）で制御する場合も並行
して個別線信号制御を行い、かつ、共通線信号方式で制
御中は端末制御プログラムからの処理要求を無効と判別
することで容易に共通線信号路を経由する制御信号（以
下、共通線信号）から個別線信号での制御へ切替えが可
能となる。The present invention performs individual line signal control in parallel when controlling a switching service by a control method using a common line signal path (hereinafter, common line signal method), and while controlling by a common line signal method. By determining that the processing request from the terminal control program is invalid, it is possible to easily switch from a control signal via a common line signal path (hereinafter, a common line signal) to control by an individual line signal.
本発明の実施例を第１図から第７図を用いて詳細に説
明する。第１図は一般的な電子交換機呼処理プログラム
に本発明による共通線信号と個別線信号の並行制御機構
を組み込んだ例である。また第２図は共通線信号方式を
採用した一般的な電子交換システムの例である。第１図
に示した呼処理プログラムは第２図に示す一般的な電子
交換機において動作する。An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows an example in which a common electronic switch call processing program incorporates a common line signal and individual line signal parallel control mechanism according to the present invention. FIG. 2 shows an example of a general electronic exchange system employing a common channel signaling system. The call processing program shown in FIG. 1 operates in the general electronic exchange shown in FIG.
まず、第２図について説明する。 First, FIG. 2 will be described.
交換局1,1′は交換スイッチ2,2′，中央制御装置3,
3′，メモリ4,4′，通話用トランク5,5′，および共通
線信号処理装置6,6′を含むようにして構成されてお
り、これら交換局1,1′は通話路７および共通線信号路
８によって接続されている一方交換局1,1′には端末9,
9′が収容されたものとなっている。The exchanges 1, 1 'are exchange switches 2, 2', a central control unit 3,
3 ', memories 4, 4', communication trunks 5, 5 ', and common line signal processing devices 6, 6'. The exchanges 1, 1 'are connected to terminal 9,
9 'is housed.
なお、以上は本発明に密接に関連する部分の論理的構
成を示している。一般的には以上の他交換局には外部記
憶装置や保守端末などが構成要素として存在するが、こ
れらは本発明に直接関係しないため図示省略されている
ものである。The above shows the logical configuration of the parts closely related to the present invention. Generally, an external storage device, a maintenance terminal, and the like exist as components in the other exchanges described above, but these are not shown because they are not directly related to the present invention.
次に、第１図は、一般的な交換処理プログラムに本発
明による共通線信号と個別線信号制御機構を組み込んだ
例を示すソフトウェア構成図である。第１図により通常
の呼の動作について入トランク着信接続を例にとり最初
に個別線信号制御を説明する。まず、端末制御プログラ
ムにおいて対向局からの発呼を検出しこれを交換処理プ
ログラムに報告する。次に、交換処理プログラムは通常
状態遷移方式により制御され、発呼報告を受けた場合ト
ランクの種別，サービス等の分析を行いダイヤルパルス
（DP）信号あるいはプッシュボタン（PB）信号受信機を
接続し数字を受信する様端末制御部に対し処理要求を発
行する。以下同様にして交換処理が実行される。Next, FIG. 1 is a software configuration diagram showing an example in which a common line signal and an individual line signal control mechanism according to the present invention are incorporated in a general exchange processing program. With reference to FIG. 1, individual line signal control will be described first with reference to an incoming call termination connection in a normal call operation. First, the terminal control program detects a call from the opposite station and reports this to the exchange processing program. Next, the exchange processing program is controlled by the normal state transition method. When a call report is received, the type of the trunk, the service, etc. are analyzed, and a dial pulse (DP) signal or a push button (PB) signal receiver is connected. Issue a processing request to the terminal control unit to receive the number. Hereinafter, the replacement process is performed in the same manner.
次に、共通線信号制御を同じ第１図により説明する。
まず、共通線信号制御プログラムにおいて対向局からの
イニシャルアドレス信号を受信しこれを交換処理プログ
ラムに報告する。次に、交換処理プログラムは個別信号
制御と同様にトランクの種別，サービス等の分析を行い
交換処理が実行される。Next, common line signal control will be described with reference to FIG.
First, the common line signal control program receives an initial address signal from the opposite station and reports this to the exchange processing program. Next, the exchange processing program analyzes the type of the trunk, the service, and the like in the same manner as the individual signal control, and executes the exchange processing.
この様に交換処理プログラムは個別線信号制御と共通
線信号制御を行っているが、第１図の中でも示している
様に個別線信号で制御中時は共通線信号制御プログラム
に対する処理要求は発行しない。As described above, the exchange processing program performs the individual line signal control and the common line signal control. However, as shown in FIG. 1, a processing request to the common line signal control program is issued during the control by the individual line signal. do not do.
また、共通線信号で制御中であっても端末制御プログ
ラムに対する処理要求を個別線信号制御時と同様に発行
している。Further, even when the control is being performed by the common line signal, a processing request to the terminal control program is issued in the same manner as when the individual line signal is controlled.
第３図に以上説明した処理方式により交換局１と交換
局１′間で送受される個別線信号と共通線信号のシーケ
ンスを共通線信号制御による発着信接続を例に示す。FIG. 3 shows, as an example, the sequence of the individual line signal and the common line signal transmitted and received between the exchange 1 and the exchange 1 'by the above-described processing method, using the transmission and reception connection by the common line signal control.
端末９′と通話すべく端末９から端末９′の番号がダ
イアルされた場合、発信出接続を行うべく交換局１から
は共通線信号としてアドレス信号（IAI）が共通線信号
を介し、また、同時に個別線信号として起動信号が通話
回線を介し交換局１′に送出される。交換局１′では共
通線信号制御中であると判別しているため個別線信号で
ある起動信号は無効とし、共通線信号であるIAI信号を
受信分析し端末９′を呼び出すと共に交換局１に共通線
信号としてアドレス完了信号（ACM）を返送する。その
後、端末９′が応答すると共通線信号として応答信号
（ANM）、個別線信号としての応答信号を交換局１に送
信する。交換局１では共通線信号制御中であるため個別
線信号を無効とし共通線信号のANM受信により端末９と
９′の通話中に設定する。以下、通話中からの呼復旧も
同様な方法で行う。When the number of the terminal 9 'is dialed from the terminal 9 to make a call with the terminal 9', an address signal (IAI) is transmitted from the exchange 1 as a common line signal through the common line signal in order to perform outgoing / outgoing connection. At the same time, a start signal is sent to the exchange 1 'via the telephone line as an individual line signal. Since the exchange 1 'determines that the common channel signal is being controlled, the start signal as the individual channel signal is invalidated, the IAI signal as the common channel signal is received and analyzed, the terminal 9' is called, and the exchange 1 is sent to the exchange 1. An address completion signal (ACM) is returned as a common line signal. After that, when the terminal 9 'responds, the response signal (ANM) as a common line signal and the response signal as an individual line signal are transmitted to the exchange 1. In the exchange 1, since the common line signal is being controlled, the individual line signal is invalidated and the ANM reception of the common line signal is set during communication between the terminals 9 and 9 '. Hereinafter, call recovery from a call is performed in the same manner.
この様に交換処理プログラムが共通線信号リンクの状
態を踏まえ現時点での呼接続を共通線信号で制御する
か、個別線信号で制御するかを判断して実行する。これ
により共通線信号リンクが障害と認識した場合は通話回
線からの個別信号を有効とする事で基本呼接続を継続す
るものである。In this way, the switching processing program determines and executes whether the current call connection is controlled by the common line signal or the individual line signal based on the state of the common line signal link. Thereby, when the common signal link is recognized as a failure, the basic call connection is continued by validating the individual signal from the communication line.
第４図は共通線信号リンクの状態を認識するプログラ
ムと、共通線信号リンクの状態により呼接続を共通線信
号で制御するか個別線信号で制御するかを交換処理プロ
グラムが決定するために参照する信号方式管理テーブル
の構造およびその相互の関連を示した図である。まず、
信号リンク状態認識プログラムは10秒程度の周期起動に
より信号リンクの状態をスキャンする。まず、信号リン
クが正常な状態から障害が発生した場合を例にとり説明
する。スキャンした信号リンクの状態がある時障害とな
った場合、障害認識用カウンターを１登算する。次周期
以降も同様な手続きで障害となっている場合、当該カウ
ンターを１登算して行く。その結果カウンターが予め定
めている規定値に達した場合、信号リンクの固定障害と
見なし信号方式管理テーブルを共通線信号から個別線信
号で制御する様に内容の変更を行う。また、信号リンク
障害中から正常な状態に至る場合も同様な手続きで信号
リンクが正常状態になった事を認識し、この場合信号方
式管理テーブルを個別線信号から共通線信号で制御する
様、内容の変更を行う。FIG. 4 shows a program for recognizing the state of the common line signaling link and the switching processing program for determining whether the call connection is controlled by the common line signal or the individual line signal depending on the state of the common line signaling link. FIG. 3 is a diagram showing the structure of a signaling system management table and its relation to each other. First,
The signal link state recognition program scans the state of the signal link at a period of about 10 seconds. First, a case where a failure occurs from a normal state of a signal link will be described as an example. If a failure occurs when the state of the scanned signal link is present, the failure recognition counter is incremented by one. If there is an obstacle in the same procedure after the next cycle, the counter is incremented by one. As a result, when the counter reaches a predetermined value, it is regarded as a fixed failure of the signal link, and the content is changed so that the signal system management table is controlled from the common line signal to the individual line signal. Also, in the case where the normal state is reached from the signal link failure, the same procedure is used to recognize that the signal link has become normal. In this case, the signal system management table is controlled from the individual line signal to the common line signal, Make changes to the content.
なお、信号方式管理テーブルは、第１図および第３図
を例にとり説明した交換処理プログラムが呼接続の過程
で参照し、共通線信号方式又は個別線信号方式での制御
を行うものである。The signaling system management table refers to the switching processing program described with reference to FIGS. 1 and 3 as an example in the course of call connection, and performs control using the common channel signaling system or the individual channel signaling system.
次に、第７図に示す共通線信号網構成での本発明の実
際の運用例を説明する。Next, an actual operation example of the present invention in the common channel signal network configuration shown in FIG. 7 will be described.
交換局１に収容されている端末９から交換局１′に収
容されている端末９′への接続を実行する場合、共通線
信号路としてのルート１が障害の場合迂回方路としての
ルート２が存在すればルート２へ迂回して接続を実行す
る。しかし、迂回路としてのルート２が存在しないか又
はルート２も障害の場合は、本発明による方式で交換局
１と交換局１′間の通話回線を共通線信号制御から個別
線信号制御へ切替えて呼の接続を行なっている。When the connection from the terminal 9 accommodated in the exchange 1 to the terminal 9 'accommodated in the exchange 1' is executed, if the route 1 as the common channel signal path is a failure, the route 2 as the detour route If there is, the connection is executed by bypassing the route 2. However, if route 2 does not exist as a detour or route 2 is also faulty, the communication line between exchange 1 and exchange 1 'is switched from common line signal control to individual line signal control by the method according to the present invention. Call connection.
第５図は、共通線信号リンクが正常な状態にある時、
通話回線を共通線信号方式で制御し、通話中状態に設定
したが当該呼が通話中、信号リンクの障害発生により、
通話呼の復旧処理以降を個別線信号による制御に切替え
て実行した場合の共通線，個別線信号シーケンスを示し
た図である。FIG. 5 shows that when the common signal link is in a normal state,
The call line was controlled by the common line signaling method and was set to the talking state.
FIG. 9 is a diagram showing a common line and individual line signal sequence in a case where control after a call recovery process is switched to control using an individual line signal and executed.
第６図は、第５図の例とは逆に、共通線信号リンクが
障害の状態にある時、発生した呼を個別線信号方式で制
御し通話中状態に設定したが当該呼が通話中、信号リン
ク障害の復旧により通話呼の復旧処理以降を共通線信号
制御に切替えて実行した場合の共通線，個別線信号シー
ケンスを示した図である。FIG. 6, contrary to the example of FIG. 5, sets the generated call to the busy state by controlling the generated call by the individual line signaling method when the common line signaling link is in a failure state, but the call is busy. FIG. 13 is a diagram showing a common line and individual line signal sequence in a case where a call link recovery process and subsequent processes are switched to common line signal control and executed by the recovery of a signal link failure.
以上説明したように本発明によれば、共通線信号リン
クの障害発生時に、容易に個別線信号方式での制御に切
替える事が可能であり、信号リンク障害中の通話回線を
個別線信号制御により有効に利用する事ができると同時
に、信号方式切替えに際し、その時点で通話中にある呼
に対しては何ら被害を与えることなくそのまま通話状態
を保つためサービス性を低下することもない。As described above, according to the present invention, when a failure occurs in the common line signaling link, it is possible to easily switch to the control using the individual line signaling system, and the communication line during the signal link failure can be controlled by the individual line signaling control. At the same time, it can be used effectively, and at the time of signal system switching, a call that is currently being talked at that time is maintained without any damage, so that serviceability is not reduced.
また、従来のシステムでは基本的に信号リンクの冗長
構成を採り信号リンク障害に備えていたが本発明により
冗長構成を廃止することができ、共通線信号装置系のコ
ストを大幅に削減することができる。Further, the conventional system basically employs a redundant configuration of the signal link and prepares for a signal link failure. However, the present invention can abolish the redundant configuration and greatly reduce the cost of the common line signaling system. it can.
第１図は共通線信号制御と個別線信号制御の並行制御機
能を組み込んだソフトウェア構成例を示す図、第２図は
本発明の一実施例を示す構成図、第３図，第５図，およ
び第６図は共通線，個別線の並行制御による共通線と個
別線各々の信号シーケンスを示す図、第４図は信号リン
ク状態認識プログラム、信号方式管理テーブルおよび交
換処理プログラムの相互関係を示す図、第７図は本発明
の運用例を説明する網構成図である。 1,1′……交換局 2,2′……交換スイッチ 3,3′……中央制御装置 4,4′……メモリ 5,5′……通話用トランク 6,6′……共通線信号処理装置 ７……通話路 ８……共通線信号路FIG. 1 is a diagram showing a software configuration example incorporating a parallel control function of common line signal control and individual line signal control, FIG. 2 is a configuration diagram showing one embodiment of the present invention, FIG. 3, FIG. And FIG. 6 is a diagram showing a signal sequence of each of the common line and the individual line by the parallel control of the common line and the individual line, and FIG. FIG. 7 is a network configuration diagram for explaining an operation example of the present invention. 1,1 'exchange office 2,2' exchange switch 3,3 'central control unit 4,4' memory 5,5 'trunk for communication 6,6' common line signal Processing unit 7: Communication path 8: Common line signal path
───────────────────────────────────────────────────── フロントページの続き (72)発明者 阿讃坊 義明 神奈川県横浜市中区尾上町６丁目81番地 日立ソフトウェアエンジニアリング株 式会社内 (56)参考文献 特開 昭62−48175（ＪＰ，Ａ) 特開 平１−126859（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04M 7/06 H04Q 3/54 - 3/545 H04M 3/22 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiaki Asanbo 6-81, Onoe-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Software Engineering Co., Ltd. (56) References JP-A-62-48175 (JP, A) JP-A-1-126859 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H04M 7/06 H04Q 3/54-3/545 H04M 3/22
Claims (3)
路制御方法であって、 前記交換局のそれぞれは、通話路に接続され交換局間を
制御する個別線信号も送受信する通話用トランクと、共
通線信号路に接続され該交換局間を制御する共通線信号
を送受信する共通線信号処理装置と、前記通話路用トラ
ンクと接続され通話を行なう通話回線を設定する交換ス
イッチと、前記通話用トランクと共通線信号処理装置と
交換スイッチを制御して通話路の生成・復旧を前記交換
局間を制御する信号に基き実施する交換処理手段を備え
た中央制御装置とを有し、 第１の交換局の交換処理手段で前記交換局間を制御する
信号を前記個別線信号と共通線信号の両方で第２の交換
局へ送信し、 前記第２の交換局の交換処理手段は、前記共通線信号の
リンク状態を監視し、共通線信号が正常な場合は前記共
通線信号処理装置を介して受信した該共通線信号に基き
該交換局を制御し、共通線信号が異常な場合は前記通話
用トランクを介して受信した個別線信号に基き該交換局
を制御し、 前記通信システムの交換局間の通話路生成・復旧を行な
うことを特徴とする通信システムの通話路制御方法。1. A communication path control method for a communication system comprising a plurality of exchanges, wherein each of said exchanges includes a communication trunk connected to a communication path and configured to transmit and receive an individual line signal for controlling between exchanges. A common line signal processing device connected to the common line signal path for transmitting and receiving a common line signal for controlling the exchanges, a switching switch connected to the trunk for the communication path and setting a communication line for performing a call, A central control unit having switching processing means for controlling a trunk for communication, a common line signal processing device, and a switching switch to perform generation and restoration of a communication path based on a signal for controlling between the switching centers; The exchange processing means of the exchanges transmits a signal for controlling between the exchanges to the second exchange as both the individual line signal and the common line signal, and the exchange processing means of the second exchange, Link of common line signal When the common channel signal is normal, the switching center is controlled based on the common channel signal received through the common channel signal processing device, and when the common channel signal is abnormal, the switching center is controlled via the communication trunk. A communication path control method for a communication system, comprising: controlling the switching center based on a received individual line signal to generate and restore a communication path between switching stations of the communication system.
い、該周期毎にリンク状態に障害があると障害カウント
手段を計数し、該障害カウント手段が所定の値になると
前記リンク状態異常と判定して個別線信号に基き交換局
を制御することを特徴とする請求項１に記載の通信シス
テムの通話路制御方法。2. The method according to claim 1, wherein the monitoring of the link status is performed at a predetermined cycle, and a fault count means is counted when there is a fault in the link status at each cycle, and when the fault count means reaches a predetermined value, the link status abnormality is detected. 2. The method according to claim 1, wherein the switching is controlled based on the individual line signal.
視したリンク状態が障害復旧状態であると障害復旧カウ
ント手段を計数し、該障害復旧カウント手段が所定の値
になると前記リンク状態の正常復旧と判定し、上記個別
線信号に基く交換局制御から上記共通線信号に基く交換
局の制御に戻すことを特徴とする請求項２に記載の通信
システムの通話路制御方法。3. When the link status is abnormal, the fault recovery counting means counts when the link status monitored in each cycle is a fault recovery status, and when the fault recovery count means reaches a predetermined value, the link status becomes normal. 3. The communication path control method for a communication system according to claim 2, wherein the recovery is determined, and the control of the exchange based on the individual channel signal is returned to the control of the exchange based on the common channel signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107666A JP2997478B2 (en) | 1989-04-28 | 1989-04-28 | Channel control method |
| US07/912,217 US5333187A (en) | 1989-04-28 | 1992-07-10 | Switching system for electronic switcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107666A JP2997478B2 (en) | 1989-04-28 | 1989-04-28 | Channel control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02288590A JPH02288590A (en) | 1990-11-28 |
| JP2997478B2 true JP2997478B2 (en) | 2000-01-11 |
Family
ID=14464928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1107666A Expired - Fee Related JP2997478B2 (en) | 1989-04-28 | 1989-04-28 | Channel control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2997478B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6248175A (en) * | 1985-08-27 | 1987-03-02 | Nec Corp | Channel control system |
| JPH01126859A (en) * | 1987-11-12 | 1989-05-18 | Fujitsu Ltd | Common line signal link fault processing system |
-
1989
- 1989-04-28 JP JP1107666A patent/JP2997478B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02288590A (en) | 1990-11-28 |
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