JPS5837743B2 - Automatic transmission line switching method - Google Patents
Automatic transmission line switching methodInfo
- Publication number
- JPS5837743B2 JPS5837743B2 JP16182979A JP16182979A JPS5837743B2 JP S5837743 B2 JPS5837743 B2 JP S5837743B2 JP 16182979 A JP16182979 A JP 16182979A JP 16182979 A JP16182979 A JP 16182979A JP S5837743 B2 JPS5837743 B2 JP S5837743B2
- Authority
- JP
- Japan
- Prior art keywords
- error rate
- threshold
- transmission line
- switching
- switched
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
Description
【発明の詳細な説明】
本発明は、伝送路の誤り率を監視して伝送路の切換えを
行なう伝送路自動切換方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic transmission line switching system for monitoring the error rate of a transmission line and switching the transmission line.
現用の伝送路の誤り率を常時監視し、その誤り率が所定
の値以上になると、自動的に予備の伝送路に切換え、誤
り率が所定の値以下になると、再び現用の伝送路に自動
的に切換える方式が採用されており、このような現用、
予備の切換方式に於いて誤り率が所定の値以上になった
り以下になったりする場合、即ち自動切換えを行なう誤
り率の閾値に近い誤り率の場合には、現用、予備の伝送
路の切換えが繰返されるので、情報伝送に悪影響を及ぼ
すことになる。The error rate of the working transmission line is constantly monitored, and when the error rate exceeds a predetermined value, it automatically switches to the backup transmission line, and when the error rate falls below the predetermined value, it automatically switches back to the working transmission line. A method of switching is adopted, and in current use,
If the error rate exceeds or falls below a predetermined value in the backup switching method, in other words, if the error rate is close to the error rate threshold for automatic switching, switching between the working and backup transmission lines is required. is repeated, which has a negative impact on information transmission.
本発明は、前述の如き従来の欠点を改善したものであり
、誤り率が所定の値以上となって現用から予備の伝送路
に切換えられたときは、誤り率の閾値を切換えて、繰返
し切換動作が行なわれないようにして、安定な情報伝送
を可能とすることを目的とするものである。The present invention improves the conventional drawbacks as described above, and when the error rate exceeds a predetermined value and the active transmission line is switched to the backup transmission line, the error rate threshold is changed and the switching is repeated. The purpose of this is to enable stable information transmission by preventing operations from occurring.
以下実施例について詳細に説明する。Examples will be described in detail below.
第１図は本発明の実施例のブロック線図であり、１，５
はスイッチ部、２ａ，２ｂは送信端局、３ａ，３ｂは中
継器、４ａ，４ｂは受信端局、６はスイッチ制御部であ
る。FIG. 1 is a block diagram of an embodiment of the present invention.
is a switch section, 2a and 2b are transmitting terminal stations, 3a and 3b are repeaters, 4a and 4b are receiving terminal stations, and 6 is a switch control section.
送信端局２ａと受信端局４ａとの間を現用伝送路、送信
端局２ｂと受信端局４ｂとの間を予備伝送路とすると、
受信端局４ａでは伝送路の誤り率を測定する手段を備え
ているものである。Assuming that the working transmission line is between the transmitting terminal station 2a and the receiving terminal station 4a, and the backup transmission line is between the transmitting terminal station 2b and the receiving terminal station 4b,
The receiving terminal station 4a is equipped with means for measuring the error rate of the transmission path.
そして誤り率の閾値は切換設定し得る構成のものである
。The error rate threshold can be set by switching.
例えば誤り率の閾値として第１の閾値１０−６とそれよ
り低い第２の閾値１０−９との切換えが可能のものであ
る。For example, the error rate threshold can be switched between a first threshold 10-6 and a lower second threshold 10-9.
先ず誤り率の閾値を１０−６に設定しておくもので、現
用系の伝送情報を受信端局の誤り率測定手段で測定し、
誤り率が１０−６以上となると、スイッチ制御部６に切
換指示信号を送り、スイッチ制御部６からスイッチ部１
，５に切換制御信号が加えられ、現用系から予備系への
切換えが行なわれる。First, the threshold value of the error rate is set to 10-6, and the transmission information of the working system is measured by the error rate measuring means of the receiving terminal station.
When the error rate exceeds 10-6, a switching instruction signal is sent to the switch control unit 6, and the switch control unit 6
, 5, a switching control signal is applied to the active system to the standby system.
この切換制御信号は受信端局４ａにも加えられ、受信端
局４ａでは誤り率測定手段の誤り率の閾値を１０−９に
切換える。This switching control signal is also applied to the receiving terminal station 4a, and the receiving terminal station 4a switches the error rate threshold of the error rate measuring means to 10-9.
又現用系には引続いて情報を伝送するか或は所定の監視
パターン情報を伝送するものであるから、受信端局４ａ
に於いては誤り率が１０−９以下にならないと切換指示
信号をスイッチ制御部６に送らないので、誤り率が１０
−６前後に変化しても切換動作は行なわれないことにな
る。In addition, since the current system is to continue transmitting information or transmitting predetermined monitoring pattern information, the receiving terminal station 4a
In this case, the switching instruction signal is not sent to the switch control unit 6 unless the error rate becomes 10-9 or less, so the error rate is 10-9 or less.
Even if the value changes to around -6, no switching operation will be performed.
送信端局２ａと受信端局４ａとの間の伝送路の状態が回
復して誤り率が１０−９以下になると、受信端局４ａか
ら切換指示信号がスイッチ制御部６に送られ、スイッチ
制御部６からの切換制御信号によりスイッチ部１，５に
於ける切換えが行なわれ、予備系から現用系に切換えら
れ、同時に誤り率の閾値は１０−６に切換えられる。When the state of the transmission path between the transmitting terminal station 2a and the receiving terminal station 4a is restored and the error rate becomes 10-9 or less, a switching instruction signal is sent from the receiving terminal station 4a to the switch control unit 6, and the switch control The switch sections 1 and 5 are switched by a switching control signal from the section 6, and the protection system is switched to the working system, and at the same time, the error rate threshold is switched to 10-6.
第２図は誤り率の閾値の切換手段の一例のブロック線図
であり、クロツク発生器１１からのクロツクを分周器１
２．１３で分周し、分周出力ａ，ｂをゲート回路１４で
選択して誤り率測定回路１５に加える。FIG. 2 is a block diagram of an example of means for switching the error rate threshold.
The frequency is divided by 2.13, and the divided outputs a and b are selected by the gate circuit 14 and applied to the error rate measuring circuit 15.
ゲート回路１４は切換制御信号Ｃによって切換動作する
ものであり、現用系が健全のとき、分周出力ａが誤り率
測定回路１５に加えられ、分周出力ａの周期内の誤りの
数が誤り率となり、前述の如く誤り率の閾値を１０−６
とすることができる。The gate circuit 14 switches according to the switching control signal C, and when the current system is healthy, the frequency-divided output a is applied to the error rate measuring circuit 15, and the number of errors within the period of the frequency-divided output a is determined as an error. As mentioned above, the error rate threshold is set to 10-6
It can be done.
そしてこの閾値以上の誤り率となると、切換指示信号ｄ
が出力され、前述のスイッチ制御部６に送られる。When the error rate exceeds this threshold, the switching instruction signal d
is output and sent to the switch control section 6 mentioned above.
そしてスイッチ制御部６からの切換制御信号Ｃが加えら
れると、分周出力ｂがゲート回路１４を介して誤り率測
定回路１５に加えられ、誤り率の閾値が例えば１０−９
に切換えられることになる。When the switching control signal C from the switch control section 6 is applied, the frequency-divided output b is applied to the error rate measuring circuit 15 via the gate circuit 14, and the error rate threshold is set to 10-9, for example.
It will be switched to.
以上説明したように、本発明は、誤り率測定手段の誤り
率の閾値を１０−６と１０−９の如く第１と第２の閾値
に切換可能とし、現用の伝送路の誤り率が第１の閾値以
上となると予備の伝送路に自動的に切換え、又誤り率測
定手段の誤り率の閾値を第１の閾値より低い第２の閾値
に切換えることにより、現用の伝送路の誤り率が第１の
閾値以下となっただけでは予備の伝送路から現用の伝送
路への切換えが行なわれず、第２の閾値以下になったと
きに切換えが行なわれるので、誤り率の閾値の僅かな変
化に応じて、現用と予備との伝送路の切換えが繰返され
ることはなくなって、安定な情報の伝送が可能となる。As explained above, the present invention makes it possible to switch the error rate threshold of the error rate measuring means to the first and second thresholds such as 10-6 and 10-9, so that the error rate of the currently used transmission path is When the error rate exceeds the first threshold, the error rate of the current transmission line is automatically switched to the backup transmission line, and the error rate threshold of the error rate measuring means is switched to a second threshold lower than the first threshold. Switching from the backup transmission line to the working transmission line is not performed just when the value falls below the first threshold, but switching occurs when the line falls below the second threshold, so slight changes in the error rate threshold Accordingly, switching between the active and standby transmission paths is no longer repeated, and stable information transmission becomes possible.
第１図は本発明の実施例のブロック線図、第２図は誤り
率測定手段の一例の要部ブロック線図である。
１，５はスイッチ部、２ａ，２ｂは送信端局、３ａ，３
ｂは中継器、４ａ，４ｂは受信端局、６はスイッチ制御
部、１１はクロツク発生器、１２，１３は分周器、１４
はゲート回路、１５は誤り率測定回路である。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of essential parts of an example of error rate measuring means. 1 and 5 are switch sections, 2a and 2b are transmitting terminal stations, 3a and 3
b is a repeater, 4a and 4b are receiving terminal stations, 6 is a switch control unit, 11 is a clock generator, 12 and 13 are frequency dividers, and 14
1 is a gate circuit, and 15 is an error rate measuring circuit.
Claims (1)
上となると予備の伝送路に自動的に切換える伝送路自動
切換方式に於いて、誤り率の第１の閾値と、該第１の閾
値より低い第２の閾値との閾値の切換可能の誤り率測定
手段を設け、該誤り率測定手段による前記現用の伝送路
の誤り率が前記第１の閾値以上となると前記予備の伝送
路に自動的に切換えると共に、前記誤り率測定手段の誤
り率の閾値を前記第２の閾値に切換え、前記現用の伝送
路の誤り率が前記第２の閾値以下となると、前記予備の
伝送路から前記現用の伝送路に自動的に切換えると共に
、前記誤り率測定手段の誤り率の閾値を前記第１の閾値
に切換えることを特徴とする伝送路自動切換方式。1. In an automatic transmission line switching method that monitors the error rate of the currently used transmission line and automatically switches to a backup transmission line when the error rate exceeds a threshold, an error rate measuring means capable of switching a threshold between a second threshold lower than a threshold of At the same time, the error rate threshold of the error rate measuring means is switched to the second threshold, and when the error rate of the working transmission path becomes equal to or less than the second threshold, An automatic transmission line switching system, characterized in that the transmission line is automatically switched to the currently used transmission line, and the error rate threshold of the error rate measuring means is also switched to the first threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16182979A JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16182979A JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5684052A JPS5684052A (en) | 1981-07-09 |
| JPS5837743B2 true JPS5837743B2 (en) | 1983-08-18 |
Family
ID=15742699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16182979A Expired JPS5837743B2 (en) | 1979-12-13 | 1979-12-13 | Automatic transmission line switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837743B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59174042A (en) * | 1983-03-23 | 1984-10-02 | Hitachi Ltd | Detecting circuit for pcm code error factor |
| JPS6460026A (en) * | 1987-08-31 | 1989-03-07 | Fujitsu Ltd | Transmission line switching device for communication equipment |
| JPH05167588A (en) * | 1991-12-13 | 1993-07-02 | Yamatake Honeywell Co Ltd | Abnormality detection system of channel in local area network |
-
1979
- 1979-12-13 JP JP16182979A patent/JPS5837743B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5684052A (en) | 1981-07-09 |
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