JPH0629882A - Auxiliary signal switching system - Google Patents

Abstract

PURPOSE:To surely execute the switching of an auxiliary signal for a signal from an opposed station even in the case a transmitting signal is looped back. CONSTITUTION:Auxiliary signal multiplexing parts 11, 21 of a transmitting side multiplex auxiliary signals to which an identification code of the own station is added by an identification code adding part 31 to two independent main signals. Auxiliary signal separating parts 15, 25 of a receiving side separate auxiliary signals S1, S2 to which the identification code is added from receiving signals. In the case there is abnormality in the auxiliary signals S1, S2, auxiliary signal detecting parts 14, 24 send out signals A1, A2. Identification code detecting parts 16, 26 separate the identification code from the auxiliary signals S1, S2, send out signals A3, A4 in the case it is not the identification code of the opposed station, and also, send out auxiliary signals S3, S4 from which the identification code is separated to a switching part 33. A switching control part 32 controls the switching part 33 so as to select a normal auxiliary signal in accordance with the signals A1, A2, A3 and A4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary signal switching system, and in particular, on the transmitting side, two branched auxiliary signals (control signals, etc.) are multiplexed into two independent main signals, respectively.
The present invention relates to an auxiliary signal switching system in which transmission is performed by one line and a receiving side separates an auxiliary signal from a main signal received through two lines to determine a normal auxiliary signal and switch the auxiliary signal.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing an example of a conventional auxiliary signal switching system. Auxiliary signal multiplexer 11 on the transmission side,
21 multiplexes the two-branched auxiliary signal into two independent main signals, and transmits the signals to the transmitters 12 and 22 and the line 10.
It is sent to the receiving side via 1, 201.

Receiving units 13 and 23 on the receiving side receive signals from the two lines 101 and 201, respectively, and send the received signals to auxiliary signal separating units 15 and 25, respectively. The auxiliary signal separating units 15 and 25 separate the auxiliary signals included in the received signals and send them to the auxiliary signal detecting units 14 and 24 and the switching unit 33. On the other hand, the auxiliary signal detector 14,
Reference numeral 24 detects an abnormality in the auxiliary signal, and when there is an abnormality, sends out alarm signals A1 and A2, respectively.

The switching control unit 34 controls the switching unit 33 so as to select a normal auxiliary signal according to the alarm signals A1 and A2.

Although not shown, the transmitting side and the receiving side have a transmitting function and a receiving function, respectively, for transmission and reception.

[0006]

In the above-mentioned conventional auxiliary signal switching system, the received signal is transmitted to the IF side at the receiving side.
If the signal is looped back to the transmitting side as it is (loopback), the transmitting side may detect the auxiliary signal transmitted by the local station, and cannot reliably receive the auxiliary signal from the opposite station. There is.

An object of the present invention is to provide an auxiliary signal switching system capable of surely receiving an auxiliary signal from an opposite station.

[0008]

In the auxiliary signal switching system of the present invention, the transmitting side multiplexes the two branched auxiliary signals into two independent main signals and transmits the signals by two lines.
The receiving side is an auxiliary signal switching system in which the auxiliary signal is separated from the main signal received via the two lines, and a normal auxiliary signal is determined and switched. A means for adding an identification code to the auxiliary signal is provided, and the receiving side corresponds to the means for detecting the identification code from the auxiliary signal received via the two lines, and the identification code detected by the detecting means. And a means for determining whether or not it is the identification code of the opposite station.

[0009]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The same parts as those of the conventional auxiliary signal switching system shown in FIG. 2 are designated by the same reference numerals. Here, what is different from FIG. 2 is that the identification code addition unit 31 is provided on the transmission side,
In addition, the identification code detection units 16 and 26 and the switching control unit 32 are provided on the receiving side.

Now, the identification code adding section 31 on the transmitting side is
The identification code of the own station given in advance is added to the auxiliary signal. The auxiliary signal multiplexers 11 and 21 multiplex the auxiliary signals, to which the identification code is added and branched into two, into two independent main signals, and transmit the transmitters 12 and 22 and the lines 101 and 20.
1 to the receiving side.

The receiving units 13 and 23 on the receiving side receive the signals from the two lines 101 and 201, respectively, and send the received signals to the auxiliary signal separating units 15 and 25, respectively. The auxiliary signal separating units 15 and 25 separate the auxiliary signals S1 and S2 to which the identification code is added respectively included in the received signals, and send them to the auxiliary signal detecting units 14 and 24 and the identifying code detecting units 16 and 26, respectively. To do. Auxiliary signal detector 14,
Reference numeral 24 detects an abnormality in the auxiliary signal, and when there is an abnormality, sends out alarm signals A1 and A2, respectively.

The identification code detectors 16 and 26 respectively receive the auxiliary signals S1 and S2 to which the identification code is added to separate and detect the identification code, and whether the detected identification code is the identification code of the corresponding opposite station. It is determined whether or not they are different, and if they are different, signals A3 and A4 indicating the difference in the identification code are transmitted. In addition, the auxiliary signal S3 from which the identification code is separated is
S4 is sent to the switching unit 33.

The switching control unit 32 receives the warning signals A1 and A2 and the signals A3 and A4 indicating the code difference, and controls the switching unit 33 so as to select a normal auxiliary signal.

[0015]

As described above, according to the present invention, the identification code is added on the transmitting side, the identification code is detected on the receiving side, and the auxiliary signal is switched. The switching of the auxiliary signal with respect to the signal can be reliably executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional auxiliary signal switching system.

[Explanation of symbols]

 11, 21 Auxiliary signal multiplexing unit 14, 24 Auxiliary signal detecting unit 15, 25 Auxiliary signal separating unit 16, 26 Identification code detecting unit 31 Identification code adding unit 32 Switching control unit 33 Switching unit 101, 201 Line S1, S2 Identification code Including auxiliary signal A1, A2 Warning signal A3, A4 Signal indicating code difference

Claims (1)

[Claims] 1. A transmitting side multiplexes a two-branched auxiliary signal into two independent main signals, respectively, and transmits by two lines, and a receiving side supplements from the main signal received via the two lines. An auxiliary signal switching method for separating signals to determine a normal auxiliary signal and switching the auxiliary signal, wherein the transmitting side includes means for adding a pre-assigned identification code of its own station to the auxiliary signal, and the receiving side Includes means for detecting the identification code from the auxiliary signal received via the two lines, and means for determining whether or not the identification code detected by the detecting means is the identification code of the corresponding opposite station. An auxiliary signal switching system characterized by being provided.