JPS6161539A - Signal transmission system - Google Patents

Abstract

PURPOSE:To simplify systems and to eliminate the deterioration of characteristics due to long distance by forming a central station, intermediate station, by-pass station with the same device. CONSTITUTION:In case that any trouble occurs in a transmission line D, relays 1, 2 operate on the make side in an intermediate station 12 and a switch signal is dispatched to a transmission line C. At the same time, an alarm is outputted to a control signal transmission path 16. This alarm inverses relays 1, 2 in a central station 10 and switches a signal on the side of a by-pass converting path. In a by-pass station 13, relays 3, 4 are inversed to switch the signal on the side of by-pass transmission line 14, 15. Furthermore, in an intermediate station, a signal from the intermediate station 12 is received and the relays 3, 4 are acted on the make side to return to signal to the side of the central station 10. Therefore, the signal forms a by-pass loop in the central station 10, a transmission line B, an intermediate line A, the central station 10, a transmission line H, a by-pass transmission line 15, a transmission line K, a by-pass station 13, a transmission line E, the intermediate line 12, a transmission station F, a by-pass station 13, a transmission line J, a by-pass transmission line 14, a transmission line G, and the central station 10 to simplify systems and eliminate the deterioration of the characteristics due to long distance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission method for connecting one point to one point and one point to multiple points without going through any exchanges.

[Prior art]

For this reason, in the past, switching to the FDM method was performed at the substrate group band.

In the conventional Fl)M method, when making multi-point connections, the central station (start station), intermediate stations, and detour amount each require equipment with different configurations, making the system and equipment complex. Furthermore, it is not suitable for high-speed data transmission, and its characteristics deteriorate when one line is long distance.

[Purpose of the invention]

The purpose of the present invention is to eliminate these drawbacks, to enable configuration with the same equipment regardless of the installation location, such as the central station, intermediate station, amount of detour, etc., and to prevent characteristic deterioration due to longer system distances.
The object of the present invention is to provide a signal transmission method that enables signal transmission.

[Structure of the invention]

1 The signal transmission system of the present invention is characterized by a first signal identification@path for identifying an error in the signal at the first input terminal, a signal disconnection, and a switching signal, an error in the signal at the second input terminal, and a signal disconnection.

A second signal sorting circuit for identifying the switching signal t, a first switching signal outputting port for outputting the switching signal, a second switching signal outputting circuit for outputting the switching signal, and a P for branching and inserting the PCM signal. A plurality of relay stations each having a CM signal add/drop circuit, a first output end, and a second output end, two detour transmission lines,
The first and second input terminals are provided with a plurality of transmission lines that are connected to each other and the second output terminal, and during normal operation, within one of the relay stations, all of the second input terminals are connected to the first and second input terminals. ) CM
and an output of the PCM add/drop circuit is connected to the second output terminal to form a central station, and inside another one of the relay stations, the first input terminal is connected to the The output of the PCM add/drop circuit is connected to the input of the PCIV add/drop circuit, and the output of the PCM add/drop circuit is connected to the second output terminal as a detour amount. Input, all the outputs of the PCM add/drop circuit are connected to the second output terminal, and the second input terminal is connected to the first output terminal to form an intermediate station, and one of the transmission lines is abnormal. When the first or second signal discriminating circuit detects this, the 61! inside the intermediate station adjacent to the abnormal transmission line. - Or, the second switching signal sending circuit outputs the entire signal to the first or second output terminal instead of i7J, and forms a loop with the transmission line L other than the abnormal transmission line and the detour transmission line. , this loop joint is configured such that the output of the PCM add/drop circuit inside the central office is connected to its input. be a sign.

〔Example〕

FIG. 1 shows a relay station in an embodiment of the present invention, and FIG. 2 shows an embodiment of the present invention. FIG. 1 shows the normal state when a relay station is used as an intermediate station, and the signal that has entered the input terminal 21 is passed through the signal sorting circuit 7 to detect an error in the input 1 signal, a signal disconnection, or a switching signal. identify.

It is manually operated via relay 2 to PCM-24 add/drop terminal equipment; The signal processed by this device passes through the relay 4 and is output to the output terminal 32. Input end 2.2K
The incoming Mio is identified by the signal detection circuit 8 as 4M.
The signal passes through relay 3 and relay 1 and is output to output terminal 31. Now, if signal 1c error, signal disconnection, or Al5 (") is detected at input terminal 21, relay 1 and relay 2 are activated to the meter side, the faulty line is disconnected, and the entire switching signal is sent to the other station. Similarly, if an abnormality is detected in the signal at the input end 22, the relay 3.4 is activated to the make side and a switching signal is sent to the output end 31).

FIG. 2 shows an example of a system configuration using this device. When used as the central station 10, the relay 1.2 is connected to the meter side, and when used as the detour amount 13, Relay 3.4f: Used by presetting to the make side. Normally, the signal is transmitted through the central station 10 and transmission line B.
t street, intermediate station 11 → transmission line D → intermediate station 12 → transmission line F
→It is transmitted to the detour amount 13 in the order of the detour station 13. Detour amount 1
The signal exiting from 12.3 is sent to transmission path E and intermediate station 12.3. Transmission path C9 intermediate station 11. It returns to the central office 10 through the transmission line.

During this time, it is possible for each station to branch, insert, and pass signals on a per channel basis as necessary, and digital data signals are also possible.

Now, if a failure occurs on the transmission path, the intermediate station 12
J rail 2 moves to the 7 meter side, sends a switching signal to transmission line C, and at the same time, ttt! Four signals are sent to the control signal transmission line 16. In response to this alarm, the central station 10 reverses the signals 1 and 2 and switches the signal to the detour transmission line side.

Similarly, when the detour amount is 13, the relay 3.4 is reversed and switched to the detour transmission line 14, 15 side.

Furthermore, the intermediate station 11 receives the switching signal 1M from the intermediate station 12, operates all relays 3 and 4 on the make side, and sends the signal to the central station 1.
Fold back to the 0 side. In addition, the L signal is sent to the central station 10. Transmission line B
, intermediate station 11. Transmission path A, central station 10. Transmission line H, detour transmission line 15. Transmission line K.

Detour amount 13. Transmission path E, intermediate station 12. Transmission line F.

Detour amount 13. Transmission line J, detour transmission line 14. A detour loop is formed at the transmission line G and the central station Lot/(:).

〔Effect of the invention〕

The present invention enables the Lυ central station, intermediate station, and terminal station to be implemented using the same device, and high-speed digital data transmission is possible without deterioration of transmission characteristics due to longer distances. This function can be used without completely reversing the signal and without using a control signal transmission path.

[Brief explanation of the drawing]

@ Figure 1 is a block diagram showing one station in an embodiment of the present invention, and Figure 2 is a block diagram showing an embodiment of the present invention. 1...Relay, 2...Relay, 3...Mountain...
·relay. 4...Relay, 5...PCM branch/add terminal circuit, 6...Switching signal sending circuit, 7...
...Signal discrimination circuit, 9...Switching signal sending circuit, 8...Signal discrimination circuit. 10...Central station, 11...Intermediate station, 1
2... Intermediate station, 13... Detour amount, 14
...Detour transmission line ('n), 15...Detour transmission line (lower part), 16...Control signal transmission line. Agent: Patent attorney Uchihara Nipaguchi. Nana/Figure

Claims (1)

[Claims] a first signal identification circuit that identifies a signal error, signal disconnection, or switching signal at the first input terminal; a second signal identification circuit that identifies a signal error, signal disconnection, or switching signal at the second input terminal; A first switching signal sending circuit that outputs a switching signal, a second switching signal sending circuit that outputs a switching signal, a PCM signal branch/add circuit that branches and inserts a PCM signal, a first output end, a second output end a plurality of relay stations having a relay station, two detour transmission lines,
a plurality of transmission lines connecting the first and second input terminals and the first and second output terminals, and during normal operation, inside one of the relay stations, the second input terminal is connected to the first and second input terminals; connected to the input of the PCM add/drop circuit, and connected the output of the PCM add/drop circuit to the second output terminal to form a central station; The PCM
The output of the PCM add-drop circuit is connected to the input of the add-drop circuit, and the output of the PCM add-drop circuit is connected to the second output terminal to serve as a detour station, and inside other relay stations, the first input terminal is connected to the input The output of the PCM add/drop circuit is connected to the second output end and the second input end is connected to the first output end to form an intermediate station, and one of the transmission lines is abnormal. When the first or second signal discriminating circuit detects,
The first or second switching signal sending circuit inside the intermediate station adjacent to the abnormal transmission line outputs the switching signal to the first or second output end, and the transmission on the transmission path other than the abnormal transmission line is terminated. A signal transmission method, characterized in that a loop is formed by the detour transmission path and the detour transmission path, and the output of the PCM drop/add circuit inside the central office is connected to the input thereof via the loop.