JPH0334697B2 - - Google Patents
Info
- Publication number
- JPH0334697B2 JPH0334697B2 JP1217085A JP1217085A JPH0334697B2 JP H0334697 B2 JPH0334697 B2 JP H0334697B2 JP 1217085 A JP1217085 A JP 1217085A JP 1217085 A JP1217085 A JP 1217085A JP H0334697 B2 JPH0334697 B2 JP H0334697B2
- Authority
- JP
- Japan
- Prior art keywords
- line
- switching
- working
- amplifier
- backup
- 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
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000012790 confirmation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えばデイジタル無線装置の受端側
で使用する無瞬断切替装置の改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a no-interruption switching device used, for example, on the receiving end side of a digital radio device.
デイジタル無線装置は従来、音声信号をデイジ
タル化して伝送していたが、近年はデータの伝送
が多くなつている。そこで、現用回線と予備回線
を切替えてもデータに誤りが発生しない様に無瞬
断切替えが行われているので、回線切替えによつ
て瞬断は生じない。 Digital wireless devices have conventionally digitized audio signals and transmitted them, but in recent years, data transmission has become more common. Therefore, since instantaneous interruption is performed so that data errors do not occur even when the working line and protection line are switched, line switching does not cause an instantaneous interruption.
しかし、例えば現用機ｎに対して予備機１の
ｎ：１予備方式の場合、装置構成上、現用機と予
備機とを接続する線路が長くなる事がある。この
場合、非動作状態にある予備機のインピーダンス
の影響を受けて、動作中の現用機の出力波形が歪
み、これを受けた例えば搬送端局側では雑音耐力
が低下する。 However, for example, in the case of an n:1 backup system in which the active machine is n and the standby machine 1 is used, the line connecting the active machine and the standby machine may become long due to the equipment configuration. In this case, the output waveform of the active device in operation is distorted due to the influence of the impedance of the standby device in the inactive state, and the noise tolerance of the carrier terminal station, for example, affected by this is reduced.
そこで、接続線路が長くなつても動作中の現用
機の出力波形に影響を与えない様な無瞬断切替装
置が要望されている。 Therefore, there is a need for a non-interruption switching device that does not affect the output waveform of the currently operating machine even if the connection line becomes long.
第３図はデイジタル伝送路の一例のブロツク図
を示す。
FIG. 3 shows a block diagram of an example of a digital transmission line.
図において、無瞬断切替えは下記の手順で行わ
れる。即ち、
(1) 受端側で障害を検出すると、受端側の回線切
替制御装置を介して送端側に送端並列命令（障
害回線TPに流している信号を予備回線SPにも
並列に流す命令）を送出する。 In the figure, uninterrupted switching is performed in the following procedure. In other words, (1) When a fault is detected on the receiving end, the receiving end sends a parallel command to the sending end via the line switching control device on the receiving end (transferring the signal flowing to the faulty line TP to the protection line SP in parallel). command) is sent.
(2) 送端側では命令を受信してから送端並列スイ
ツチ１を駆動する。(2) On the sending end side, after receiving the command, the sending end parallel switch 1 is driven.
(3) 送端並列スイツチ１が動作した事の確認信号
を受端側に伝送し、受端側でこれを確認した
後、受端切替スイツチ２を駆動して予備回線
SPに切替える。(3) Transmit a confirmation signal that the sending end parallel switch 1 has operated to the receiving end, and after confirming this on the receiving end, drive the receiving end changeover switch 2 to switch to the backup line.
Switch to SP.
(4) 復旧については、現用回線TPの障害回復を
受端側で検出した時、受端スイツチ２を復旧す
ると共に、送端側に出していた送端並列命令を
止め、送端スイツチ１も復旧させる。(4) Regarding recovery, when the receiving end detects that the working line TP has recovered from the fault, it restores the receiving end switch 2, stops the sending end parallel commands issued to the sending end, and also sends the sending end switch 1. restore it.
第４図は受端側無瞬断切替装置の従来例のブロ
ツク図を、第５図は切替動作図を示す。 FIG. 4 shows a block diagram of a conventional example of a receiving end side non-interruption switching device, and FIG. 5 shows a switching operation diagram.
図において、上記の様に送端並列命令によつ
て、送端側では現用回線TPと予備回線SPの両方
から同じ信号を送出する。 In the figure, the sending end sends the same signal from both the working line TP and the protection line SP by the sending end parallel command as described above.
そこで、受端側の予備線路増幅器３と現用線路
増幅器４に同じ信号が加えられる。 Therefore, the same signal is applied to the backup line amplifier 3 and the working line amplifier 4 on the receiving end side.
尚、この信号は位相が一致しており、且つ線路
増幅器は例えばICで構成されて高速切替えが可
能なものとする。 It is assumed that these signals have the same phase and that the line amplifier is composed of, for example, an IC and is capable of high-speed switching.
しかし、確認信号を受信しない内は予備線路増
幅器３はオフになつているので、送信側よりの信
号は現用線路増幅器４、第２の線路１１及びハイ
ブリツド回路５を介して端子OUTより外部に送
出される。 However, as long as the confirmation signal is not received, the backup line amplifier 3 is turned off, so the signal from the transmitting side is sent out from the terminal OUT via the working line amplifier 4, the second line 11, and the hybrid circuit 5. be done.
今、確認信号が受信されると、現用線路増幅器
４がオフになり、送端側よりの信号は予備線路増
幅器３、第１の線路１０及びハイブリツド回路５
を介して送出される（第４図参照）。 Now, when the confirmation signal is received, the working line amplifier 4 is turned off, and the signal from the sending end is transmitted to the backup line amplifier 3, the first line 10 and the hybrid circuit 5.
(see Figure 4).
しかし、線路増幅器はオフの時は出力側が高イ
ンピーダンスになつている。そこで、第１及び第
２の線路長が長くなる場合、動作している線路増
幅器の出力側と上記の高インピーダンスが接続さ
れたハイブリツド回路とが不整合になる。
However, when the line amplifier is off, the output side has a high impedance. Therefore, when the first and second line lengths become long, there is a mismatch between the output side of the operating line amplifier and the hybrid circuit to which the high impedance is connected.
この為、出力波形が歪み、雑音耐力が低下す
る、と云う問題点が生ずる。 This causes problems in that the output waveform is distorted and the noise tolerance is reduced.
上記の問題点は、入力されるデイジタル信号を
増幅する現用及び予備線路増幅器と、該現用回線
から該予備回線に切替える時は、予備終端抵抗器
に接続されていた第１の線路を該現用線路増幅器
に切替えて接続した後、該予備線路増幅器をオン
に、該現用線路増幅器をオフにし、その後、該現
用線路増幅器に接続されていた第２の線路を現用
終端抵抗器に切替えて接続し、復旧の時は、逆の
手順で切替え動作を行う切替回路と、該第１及び
第２の線路と出力端子とを接続するハイブリツド
回路とから構成された本発明の無瞬断切替装置に
より解決される。
The above problems are caused by the working and protection line amplifiers that amplify the input digital signals, and when switching from the working line to the protection line, the first line connected to the protection termination resistor is connected to the working line. after switching to and connecting the amplifier, turning on the backup line amplifier and turning off the working line amplifier, and then switching and connecting the second line that was connected to the working line amplifier to the working termination resistor; At the time of restoration, the problem can be solved by the non-instantaneous switching device of the present invention, which is composed of a switching circuit that performs switching operation in reverse order, and a hybrid circuit that connects the first and second lines and the output terminal. Ru.
本発明は、オフになつている線路増幅器に接続
されている線路を終端抵抗器で終端する事によ
り、ハイブリツド回路のインピーダンスが一定の
値になる様にした。
In the present invention, the impedance of the hybrid circuit is maintained at a constant value by terminating the line connected to the turned-off line amplifier with a terminating resistor.
そこで、動作中の線路増幅器の出力側はハイブ
リツド回路と整合が取れるので、出力波形は歪ま
ず、雑音耐力は低下しない。 Therefore, since the output side of the line amplifier in operation can be matched with the hybrid circuit, the output waveform will not be distorted and the noise tolerance will not deteriorate.
第１図は本発明の一実施例のブロツク図を、第
２図は第１図の切替動作図を示す。
FIG. 1 shows a block diagram of an embodiment of the present invention, and FIG. 2 shows a switching operation diagram of FIG. 1.
そこで、第２図を参照しながら第１図の動作を
説明する。 Therefore, the operation shown in FIG. 1 will be explained with reference to FIG.
第１図において、現用線路増幅器４から予備線
路増幅器３に切替える時の動作手順は下記の様で
ある。 In FIG. 1, the operating procedure when switching from the working line amplifier 4 to the backup line amplifier 3 is as follows.
(1) 外部よりの切替命令によりスイツチ６を動
作させて、第１の線路１０を予備終端抵抗器８
から予備線路増幅器３に接続替えする。(1) Operate the switch 6 by an external switching command to connect the first line 10 to the preliminary termination resistor 8.
connection to the backup line amplifier 3.
(2) 外部からの切替命令により現用線路増幅器
４をオフ、予備線路増幅器３をオンにする。(2) The working line amplifier 4 is turned off and the backup line amplifier 3 is turned on by an external switching command.
(3) 外部からの切替命令によりスイツチ７を動
作させて、第２の線路１１を現用線路増幅器４
から現用終端抵抗器９に接続替えする（第２図
参照）。(3) The switch 7 is operated by an external switching command, and the second line 11 is connected to the working line amplifier 4.
and change the connection to the current termination resistor 9 (see Figure 2).
この様に切替える事により、ハイブリツド回路
５のインピーダンスは例えばほぼ75Ωに保たれる
ので、歪のない波形が送出できる。 By switching in this manner, the impedance of the hybrid circuit 5 is maintained at approximately 75Ω, for example, so that a distortion-free waveform can be transmitted.
以上詳細に説明した様に、ハイブリツド回路と
現用及び予備線路増幅器を結ぶ線路が長い時、例
えばオフになつている予備線路増幅器に接続され
る線路を終端抵抗器で終端する様にしたので、オ
ンになつている現用線路増幅器への予備線路増幅
器からの影響はなくなつた。
As explained in detail above, when the line connecting the hybrid circuit and the working and backup line amplifiers is long, for example, the line connected to the backup line amplifier that is turned off is terminated with a terminating resistor. The influence of the standby line amplifier on the working line amplifier, which is currently in use, has disappeared.
これにより、歪のない出力波形が得られるので
雑音耐力の低下はなくなると云う効果がある。 This has the effect that a distortion-free output waveform is obtained, so that there is no reduction in noise tolerance.
第１図は本発明の一実施例のブロツク図、第２
図は第１図の切替動作図、第３図はデイジタル伝
送路のブロツク図、第４図は従来例のブロツク
図、第５図は第４図の切替動作図を示す。
図において、３は予備線路増幅器、４は現用線
路増幅器、５はハイブリツド回路、６，７はスイ
ツチ、８，９は予備及び現用終端抵抗器、１０，
１１は第１及び第２の線路を示す。
FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
1, FIG. 3 is a block diagram of a digital transmission line, FIG. 4 is a block diagram of a conventional example, and FIG. 5 is a switching operation diagram of FIG. 4. In the figure, 3 is a backup line amplifier, 4 is a working line amplifier, 5 is a hybrid circuit, 6 and 7 are switches, 8 and 9 are backup and working termination resistors, 10,
11 indicates the first and second lines.
Claims (1)
路の受端側において、入力されるデイジタル信号
を増幅する現用及び予備線路増幅器と、該現用回
線から該予備回線に切替える時は、予備終端抵抗
器に接続されていた第１の線路を該予備線路増幅
器に切替えて接続した後、該予備線路増幅器をオ
ンに、該現用線路増幅器をオフにし、その後、該
現用線路増幅器に接続されていた第２の線路を現
用終端抵抗器に切替えて接続し、復旧の時は、逆
の手順で切替え動作を行う切替回路と、該第１及
び第２の線路と出力端子とを接続するハイブリツ
ド回路とから構成された事を特徴とする無瞬断切
替装置。1. On the receiving end side of a digital transmission line that has a working line and a protection line, there are working and protection line amplifiers that amplify the input digital signals, and a spare termination resistor when switching from the working line to the protection line. After switching and connecting the first line that was connected to the backup line amplifier, the backup line amplifier is turned on and the working line amplifier is turned off, and then the second line that was connected to the working line amplifier is switched on. It consists of a switching circuit that switches and connects the line to the current terminating resistor and performs the switching operation in the reverse order at the time of restoration, and a hybrid circuit that connects the first and second lines and the output terminal. A non-stop switching device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1217085A JPS61171234A (en) | 1985-01-25 | 1985-01-25 | Switching device without hit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1217085A JPS61171234A (en) | 1985-01-25 | 1985-01-25 | Switching device without hit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61171234A JPS61171234A (en) | 1986-08-01 |
| JPH0334697B2 true JPH0334697B2 (en) | 1991-05-23 |
Family
ID=11797958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1217085A Granted JPS61171234A (en) | 1985-01-25 | 1985-01-25 | Switching device without hit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61171234A (en) |
-
1985
- 1985-01-25 JP JP1217085A patent/JPS61171234A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61171234A (en) | 1986-08-01 |
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