JPS6229937B2 - - Google Patents
Info
- Publication number
- JPS6229937B2 JPS6229937B2 JP53147865A JP14786578A JPS6229937B2 JP S6229937 B2 JPS6229937 B2 JP S6229937B2 JP 53147865 A JP53147865 A JP 53147865A JP 14786578 A JP14786578 A JP 14786578A JP S6229937 B2 JPS6229937 B2 JP S6229937B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- circuit
- monitor
- output
- hybrid circuit
- 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 43
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】
本発明は電力線保護用搬送端局装置における送
信モニタ方式の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a transmission monitoring system in a carrier terminal station device for power line protection.
従来このような送信モニタ方式としては第１図
のブロツク図に示すごとき構成のものが使用され
ていた。１は送信回路、２は送信増幅器、３は送
信モニタ回路、４は受信回路、５はハイブリツド
回路、６は線路ろ波器、７は絶縁トランスであ
る。 Conventionally, as such a transmission monitoring system, a configuration as shown in the block diagram of FIG. 1 has been used. 1 is a transmitting circuit, 2 is a transmitting amplifier, 3 is a transmitting monitor circuit, 4 is a receiving circuit, 5 is a hybrid circuit, 6 is a line filter, and 7 is an isolation transformer.
このような送信モニタ方式は送信増幅器２の出
力を送信モニタ回路３で送信モニタをしているの
で、絶縁トランス７、線路ろ波器６を経由して入
力する受信信号がハイブリツド回路５で分割さ
れ、送信モニタ回路３にも印加されている。一方
送信モニタ３の感動レベルは送信出力の完全断の
みでなく、何等かの障害による送信電力低下も検
出するべく、例えば送信電力が1/3になる10dBダ
ウンに設定されている。したがつて送信モニタ回
路３に印加される受信入力レベルが送信モニタ回
路３の感動レベル以上の場合には、送信回路１、
送信増幅器２に障害が発生して、送信レベルが低
下すると、受信信号のため検出できなくなり、送
信出力を監視するための送信モニタとして、動作
しないという欠点があつた。本発明はこれらの欠
点を解決するために、送信増幅器の出力側にハイ
ブリツド回路を付加し、受信入力レベルに関係な
く、送信出力を監視できる送信モニタを提供する
にある。 In such a transmission monitoring method, the output of the transmission amplifier 2 is monitored by the transmission monitor circuit 3, so that the received signal input via the isolation transformer 7 and the line filter 6 is divided by the hybrid circuit 5. , is also applied to the transmission monitor circuit 3. On the other hand, the impression level of the transmission monitor 3 is set to, for example, 10 dB down, which reduces the transmission power to 1/3, in order to detect not only a complete cutoff of the transmission output, but also a decrease in the transmission power due to some kind of failure. Therefore, when the reception input level applied to the transmission monitor circuit 3 is equal to or higher than the impression level of the transmission monitor circuit 3, the transmission circuit 1,
If a failure occurs in the transmission amplifier 2 and the transmission level decreases, it cannot be detected because of the received signal, and it has the disadvantage that it does not function as a transmission monitor for monitoring the transmission output. In order to solve these drawbacks, the present invention provides a transmission monitor that adds a hybrid circuit to the output side of the transmission amplifier and can monitor the transmission output regardless of the reception input level.
第２図は本発明の実施例であつて１〜７は第１
図と同義、８はハイブリツド回路である。説明を
省略するが、受信モニタ回路は受信回路４に含ま
れている。 FIG. 2 shows an embodiment of the present invention, and 1 to 7 are first embodiments of the present invention.
Same as the figure, 8 is a hybrid circuit. Although the explanation is omitted, the reception monitor circuit is included in the reception circuit 4.
この動作は送信回路１の出力信号が送信増幅器
２で増幅され、ハイブリツド回路８の入力端に印
加される。ハイブリツド回路８で分割された送信
信号は、送信モニタ回路３及びハイブリツド回路
５の入力端にそれぞれ印加される。このハイブリ
ツド回路５の出力信号は線路ろ波器６、絶縁トラ
ンス７を経由して線路に送出される。一方絶縁ト
ランス７、線路ろ波器６を経由して入力する受信
信号は、ハイブリツド回路５で分割されるため、
受信回路４に印加されると共にハイブリツド回路
８にも印加される。このハイブリツド回路８でさ
らに分割された受信信号は、それぞれ送信増幅器
２、送信モニタ回路３に印加される。ここでハイ
ブリツド回路８によつて送信モニタ回路３の方向
に分割される受信信号の減衰を、同様に分割され
る送信信号の減衰に対して十分大きな値に設定す
れば、受信入力レベルに関係なく送信信号の出力
を監視できる送信モニタが可能になる。なおハイ
ブリツド回路８は、トランスでも半導体集積回路
による構成でも同じ結果が得られる。 In this operation, the output signal of the transmitting circuit 1 is amplified by the transmitting amplifier 2 and applied to the input terminal of the hybrid circuit 8. The transmission signal divided by the hybrid circuit 8 is applied to the input terminals of the transmission monitor circuit 3 and the hybrid circuit 5, respectively. The output signal of this hybrid circuit 5 is sent to the line via a line filter 6 and an isolation transformer 7. On the other hand, the received signal input via the isolation transformer 7 and the line filter 6 is divided by the hybrid circuit 5.
It is applied to the receiving circuit 4 and also to the hybrid circuit 8. The received signals further divided by this hybrid circuit 8 are applied to a transmission amplifier 2 and a transmission monitor circuit 3, respectively. Here, if the attenuation of the received signal divided in the direction of the transmission monitor circuit 3 by the hybrid circuit 8 is set to a value sufficiently larger than the attenuation of the transmitted signal divided in the same way, the attenuation of the received signal divided in the direction of the transmission monitor circuit 3 can be A transmission monitor that can monitor the output of the transmission signal becomes possible. Note that the hybrid circuit 8 can obtain the same result whether it is configured by a transformer or a semiconductor integrated circuit.
以上説明したごとく本発明の送信モニタ方式に
よれば送信出力レベルが断又は低下した際、受信
信号により送信モニタが誤動作するのを防止する
ことができる。 As explained above, according to the transmission monitoring system of the present invention, when the transmission output level is cut off or decreased, it is possible to prevent the transmission monitor from malfunctioning due to the received signal.
第１図は従来例の送信モニタ方式を示すブロツ
ク図、第２図は本発明の実施例を示す送信モニタ
方式のブロツク図である。
１：送信回路、２：送信増幅器、３：送信モニ
タ回路、４：受信回路、５，８：ハイブリツド回
路、６：線路ろ波器、７：絶縁トランス。
FIG. 1 is a block diagram showing a conventional transmission monitoring system, and FIG. 2 is a block diagram of a transmission monitoring system according to an embodiment of the present invention. 1: Transmission circuit, 2: Transmission amplifier, 3: Transmission monitor circuit, 4: Receiving circuit, 5, 8: Hybrid circuit, 6: Line filter, 7: Isolation transformer.
Claims (1)
の一部をとり出して送信モニタ回路で監視する方
式において、送信増幅器の出力側にハイブリツド
回路を付加し、このハイブリツド回路でモニタ回
路への送信信号入力を抑制して、送信出力監視を
行うことを特徴とする送信モニタ方式。1 In a method in which a part of the transmission output in a power line protection carrier terminal equipment is taken out and monitored by a transmission monitor circuit, a hybrid circuit is added to the output side of the transmission amplifier, and this hybrid circuit inputs the transmission signal to the monitor circuit. A transmission monitoring method characterized by suppressing transmission output and monitoring transmission output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14786578A JPS5575354A (en) | 1978-12-01 | 1978-12-01 | Communication monitor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14786578A JPS5575354A (en) | 1978-12-01 | 1978-12-01 | Communication monitor system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5575354A JPS5575354A (en) | 1980-06-06 |
| JPS6229937B2 true JPS6229937B2 (en) | 1987-06-29 |
Family
ID=15439986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14786578A Granted JPS5575354A (en) | 1978-12-01 | 1978-12-01 | Communication monitor system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5575354A (en) |
-
1978
- 1978-12-01 JP JP14786578A patent/JPS5575354A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5575354A (en) | 1980-06-06 |
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