JPS60237731A - Switching device of if band circuit - Google Patents
Switching device of if band circuitInfo
- Publication number
- JPS60237731A JPS60237731A JP9517584A JP9517584A JPS60237731A JP S60237731 A JPS60237731 A JP S60237731A JP 9517584 A JP9517584 A JP 9517584A JP 9517584 A JP9517584 A JP 9517584A JP S60237731 A JPS60237731 A JP S60237731A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pilot signal
- band
- line
- stand
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は多重電話信号伝送用マイクロ波通信に使用され
る中間周波(IF)帯回線切替え装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intermediate frequency (IF) band line switching device used in microwave communication for transmitting multiple telephone signals.
(従来技術)
従来、マイクロ波通信方式において使用されるIF帯回
線の切替え装置では受信側において回線パイロット信号
および雑音のレベルを監視しており、これらのいずれか
が異常であることを検出した場合には回線制御装置を通
して送信側のスイッチを動作させ、予備回線によシ同じ
信号を伝送して受端側でパイロット信号および雑音のレ
ベルをチェックするようにして−た。これらのレベルが
正常でおる場合には、受端側のスイッチが動作して現用
回線から予備回線への切替えが完了する。(Prior art) Conventionally, IF band line switching equipment used in microwave communication systems monitors the line pilot signal and noise level on the receiving side, and if any of these is detected to be abnormal. In this case, the switch on the transmitting side was operated through the line control equipment, the same signal was transmitted over the protection line, and the level of the pilot signal and noise was checked on the receiving side. If these levels are normal, the switch on the receiving end operates and the switching from the working line to the protection line is completed.
一方、テレビジョン信号を伝送する場合には十数HOP
に及ぶ伝送が多く、その途中の局からの分岐や挿入も多
いのが実情である。マイクロ波通信においては伝搬路の
状態や機器の相加による特性の変動によ)、一般的には
中継するHOP数が多くなる程ベースバンド帯での高域
での振幅特性が劣化し、端局においては復調器の後段に
振幅特性の劣化を補償するための等化器を設けるのが−
般であった。On the other hand, when transmitting television signals, there are more than 10 HOPs.
The reality is that there are many transmissions that extend over 100 days, and that there are many branches and additions from stations along the way. In microwave communication, the amplitude characteristics in the high frequency range of the baseband band deteriorates as the number of HOPs relayed increases (due to changes in characteristics due to propagation path conditions and addition of equipment), At the station, it is recommended to install an equalizer after the demodulator to compensate for the deterioration of the amplitude characteristics.
It was common.
第1図は従来技術による回線切替え装置の受信部の一例
を示すブロック図である。第1図において、11〜14
はそれぞれ現用回線パイロットおよび雑音を検出するた
めの検出器、2は予備回線パイロットおよび雑音を検出
するための検出器、3は受端スイッチ、4はパイロット
信号を再挿入するためのFM発振器である。FIG. 1 is a block diagram showing an example of a receiving section of a line switching device according to the prior art. In Figure 1, 11 to 14
are a detector for detecting the working line pilot and noise, 2 is a detector for detecting the protection line pilot and noise, 3 is a receiving end switch, and 4 is an FM oscillator for reinserting the pilot signal. .
上記の構成において現用回線から予備回線への回線切替
えが行われた場合には、伝送されるルートおよび使用さ
れる機器が異なるため、ベースバンド帯の振幅特性およ
びパイロット信号レベルが変動してしまうという欠点が
あった。When the line is switched from the working line to the protection line in the above configuration, the amplitude characteristics of the baseband band and the pilot signal level will fluctuate because the transmission route and equipment used will be different. There were drawbacks.
(発明の目的)
本発明の目的はマイクロ波通信方式において、現用回線
から予備回線へ回線切替えを行う場合に伝送ルートの相
違や伝送される送受信装置の相違によ〕生ずるベースバ
ンド帯での振幅特性、特に高域での変化を減少させ、さ
らに回線切替えの基準としているパイロット信号のレベ
ルを安定化するようにして上記欠点を除去し、現用回線
から予備回線への回線の切替えを行う際に生ずるベース
バンド帯での振幅特性、および74071号レベルの変
動を補正することができるように構成したIP帯回線切
替え装置を提供することにある。(Object of the Invention) The object of the present invention is to reduce the amplitude in the baseband band that occurs due to differences in transmission routes and differences in transmitting/receiving equipment when switching from a working line to a protection line in a microwave communication system. The above disadvantages are eliminated by reducing changes in characteristics, especially in high frequencies, and further stabilizing the level of the pilot signal that is used as a reference for line switching. It is an object of the present invention to provide an IP band line switching device configured to be able to correct the amplitude characteristics in the baseband band and the fluctuations in the No. 74071 level that occur.
(発明の構成)
本発明によるIF帯回線切替え装置は、現用回線と予備
回線とを設け、現用予備切替えスイッチによシ両回線間
で切替えることができるものでらシ、IF帯可変振幅等
化器と、複数の検出器と。(Structure of the Invention) The IF band line switching device according to the present invention has a working line and a protection line, and can switch between the two lines using a working protection changeover switch. instrument and multiple detectors.
制御回路とを具備して構成したものである。This configuration includes a control circuit.
IP帯可変振幅等化器は、予備回線のルートに設置され
ていてIF帯において、ベースバンド帯での振幅周波数
特性およびパイロット信号レベルの変動を補償するだめ
のものである。The IP band variable amplitude equalizer is installed on the route of the protection line and is used to compensate for fluctuations in amplitude frequency characteristics and pilot signal level in the baseband band in the IF band.
複数の検出器は、それぞれ現用回線々らびに予備回線に
おけるパイロット信号レベルおよび雑音を検出するだめ
のものでめる。The plurality of detectors are each adapted to detect pilot signal levels and noise on the working lines and protection lines.
制御回路は、パイロット信号の検出レベルに応じてIF
帯可変振幅等化器を制御するためのものである。The control circuit controls the IF according to the detection level of the pilot signal.
This is for controlling the band variable amplitude equalizer.
(実施例) 以下、図面を参照して本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.
第2図は本発明によるIF帯回線切替え装置の一実施例
を示すブロック図である。第2図において、11〜14
はそれぞれ現用回線パイロット信号および雑音の検出器
、2は予備回線パイロット信号および雑音の検出器、S
Fi受端スイッチ、4#−iFMFM発振器はIF帯の
振幅等化器であって外部制御電圧により等化量を変化さ
せることができるもの、6はパイロット信号レベルに応
じて振幅等化器5を制御するための制御信号を出力する
制御回路である。FIG. 2 is a block diagram showing an embodiment of an IF band line switching device according to the present invention. In Figure 2, 11 to 14
are working line pilot signal and noise detectors, 2 are protection line pilot signal and noise detectors, and S
The Fi receiving end switch, 4#-iFMFM oscillator is an IF band amplitude equalizer, and the amount of equalization can be changed by an external control voltage. 6 is an amplitude equalizer 5 that operates according to the pilot signal level. This is a control circuit that outputs a control signal for control.
予備回線にIF帯での振幅等化器5を挿入し、パイロッ
ト信号レベルの変動に応じた出力により等化量を変化さ
せれば回線の切替えKよるベースバンド振幅特性、およ
びパイロット信号レベルの変動を補償することが可能で
ある。If an amplitude equalizer 5 in the IF band is inserted into the protection line and the equalization amount is changed by the output according to the fluctuation of the pilot signal level, the baseband amplitude characteristics and the fluctuation of the pilot signal level due to the switching of the line can be changed. It is possible to compensate for
いま、現用回線のパイロット信号の検出器11〜13の
一つが異常を検出し、相手局の送@側スイッチを駆動し
て予備回線に現用回線の信号を伝送すると、予備回線に
設けられた現用パイロット信号の検出器14によシパイ
ロット信号を検出する。Now, when one of the pilot signal detectors 11 to 13 of the working line detects an abnormality and drives the transmission @ side switch of the other station to transmit the signal of the working line to the protection line, the working line installed on the protection line A pilot signal detector 14 detects the pilot signal.
このとき、伝送ルートの相違や機器の相違によシペーヌ
バンド帯での振幅特性が劣化し7ている場合には、パイ
ロット信号レベルの低下として検出される。上記の低下
した検出レベルにもとづいて制御回路から制a信号を出
力し、この出力に応じてIF帯振幅等化器5の等化量を
制御することができる。At this time, if the amplitude characteristics in the Cypeine band are degraded due to differences in transmission routes or equipment, this is detected as a drop in the pilot signal level. Based on the above-mentioned lowered detection level, the control circuit outputs a control signal a, and the equalization amount of the IF band amplitude equalizer 5 can be controlled in accordance with this output.
(発明の効果)
以上説明したように本発明では、予備回線ルー)KIF
帯振幅等化器およびパイロット信号レベルの変動に応じ
た制御信号を出力することができるように構成すること
によシ、ベースバンド帯で等化することが困難な、現用
回線から予備回線への回線切替えを行った際に生ずるベ
ースバンド帯での振幅特性の変動龜よびパイロット信号
レベルの変動を補償することか可能でおるという効果が
ある。(Effect of the invention) As explained above, in the present invention, the backup line (KIF)
By configuring a band amplitude equalizer and a control signal that can output a control signal according to fluctuations in the pilot signal level, it is possible to convert the working line to the protection line, which is difficult to equalize in the baseband band. This has the advantage that it is possible to compensate for fluctuations in the amplitude characteristics in the baseband band and fluctuations in the pilot signal level that occur when switching lines.
第1図は、従来技術によるIF帯回線切替え装置の受信
側の構成を示す系統図である。
第2図は、本発明によるIP帯回線切替え装置の一実施
例の構成を示す系統図である。
11〜14.2@−−検出器
3・・−會−受端スイッチ
4・・φ・−FM発振器
5・・−・・IF帯可変振幅等化器
6・・・・・制御回路
特許出願人 日本電気株式会社
第1図FIG. 1 is a system diagram showing the configuration of the receiving side of an IF band line switching device according to the prior art. FIG. 2 is a system diagram showing the configuration of an embodiment of the IP band line switching device according to the present invention. 11~14.2@--Detector 3...--Receiving end switch 4...φ--FM oscillator 5...IF band variable amplitude equalizer 6...Control circuit patent application People NEC Corporation Figure 1
Claims (1)
よシ前記両回線間で切替えることができるIP帯回線切
替え装置であって、前記予備回線のルートに設置されて
いてIF帯においてベースバンド帯での振幅周波数特性
およびパイロット信号レベルの変動を補償するためのI
F帯可変振幅等化器と、前記現用回線ならびに前記予備
回線における前記パイロット信号レベルおよび雑音を検
出するための複数の検出器と、前記パイロット俳号の検
出レベルに応じて帥記IF帯可変振幅等化器を制御する
ための制御回路とを具備して構成したことを特徴とする
IP帯回線切替え装置。An IP band line switching device that can switch between a working line and a protection line using a working/protection changeover switch, which is installed on the route of the protection line and is installed in the baseband band in the IF band. I to compensate for fluctuations in amplitude frequency characteristics and pilot signal level at
an F-band variable amplitude equalizer, a plurality of detectors for detecting the pilot signal level and noise in the working line and the protection line, and a standard IF band variable amplitude equalizer according to the detection level of the pilot signal. 1. An IP band line switching device comprising: a control circuit for controlling a converter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9517584A JPS60237731A (en) | 1984-05-11 | 1984-05-11 | Switching device of if band circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9517584A JPS60237731A (en) | 1984-05-11 | 1984-05-11 | Switching device of if band circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60237731A true JPS60237731A (en) | 1985-11-26 |
Family
ID=14130410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9517584A Pending JPS60237731A (en) | 1984-05-11 | 1984-05-11 | Switching device of if band circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60237731A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0492438A2 (en) * | 1990-12-20 | 1992-07-01 | Fujitsu Limited | Method and system for making bipolar switching to protection channel |
-
1984
- 1984-05-11 JP JP9517584A patent/JPS60237731A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0492438A2 (en) * | 1990-12-20 | 1992-07-01 | Fujitsu Limited | Method and system for making bipolar switching to protection channel |
US5311170A (en) * | 1990-12-20 | 1994-05-10 | Fujitsu Limited | Method and system for making bipolar switching to protection channel |
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