JPH04276928A - Optical multiplex terminal station equipment - Google Patents

Abstract

PURPOSE:To surely set the propriety of in-station transmission by providing a circuit connecting/disconnecting the transmission of in-station of detection information from an in-station signal input interrupt detection circuit in response to the information representing the presence of connection of an in-station equipment to an in-station line to the station equipment. CONSTITUTION:When an in-station signal input terminal A1 is connected to an in-station opposite device, information representing presence of connection is inputted from an in-station connection information input terminal F1 and an alarm output inhibit circuit 3 outputs output information of an in-station signal input interrupt detection circuit 2 to an alarm output terminal G1 as it is accordingly. When the device is not connected, the information representing the absence of connection is inputted from the terminal F1 and the circuit 3 inhibits an alarm signal raised from the circuit 2 from being outputted to the terminal G1. Thus, the connection/disconnection of an alarm representing the in-station signal input interruption is set automatically in response to the connection state of the in-station opposite equipment and the propriety of the in-station transmission of alarm is surely set.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical multiplexing terminal device for transmitting data using optical fibers.

0002

2. Description of the Related Art As shown in FIG. 2, a conventional optical multiplexing terminal device outputs an alarm signal to an internal signal receiving circuit 4 of a transmitter 13 when an internal signal input disconnection detection circuit 2 detects an input disconnection. A manual switch SW is provided for setting connection/disconnection of output to terminals B1 to Bn. That is, by setting each manual switch SW, it is possible to set whether or not to connect the alarm signal to the alarm output terminal. The signals input to the local signal input terminals A1 to An of the transmitter 13 are time-division multiplexed by the multiplexing circuit 5, converted into optical signals by the electrical/optical conversion circuit 6, and then optically transmitted from the output terminal C. Sent to the transmission path. Conversely, in the receiving section 14, the optical signal received from the input terminal D is converted into an electrical signal by the optical-to-electrical conversion circuit 8, and then time-division separated by the separation circuit 9, and then sent to the intra-office signal transmitting circuit 10.
The signal is then output from the station signal output terminals E1 to En.

0003

In the optical multiplexing terminal equipment, not all of the n intra-office signal input terminals A1 to An are connected to the intra-office partner equipment. In this case, the internal station signal input disconnection detection circuit 2 detects an input disconnection in the channel to which no internal station partner device is connected, but this input disconnection state is not a failure, so the alarm output terminals B1 to B
The manual switch SW is set to the OFF state so as not to issue an alarm from the corresponding channel of n.

[0004] In the conventional optical multiplexing terminal layer, after confirming whether all the n intra-office signal input terminals A1 to An are connected to the other end devices within the office, the manual switch SW
There are problems in that the work is complicated and there is a risk of incorrect switch settings due to a work error.

[0005]

[Means for Solving the Problems] The device of the present invention includes a plurality of local signal receiving circuits each having a local signal input disconnection detection circuit for detecting the presence or absence of an electric signal input from an internal line, and each of the local signal receiving circuits. a transmitter having a multiplexing circuit that multiplexes the electrical signals received by the circuit; and an electrical-to-optical conversion circuit that converts the multiplexed electrical signals into optical signals;
An optical-to-electrical conversion circuit that converts an optical signal received from a transmission line into an electrical signal, a separation circuit that separates the converted electrical signal into a plurality of internal signals, and a separation circuit that sends each of the plurality of internal signals to an internal line. In the optical multiplexing terminal equipment including a plurality of internal signal transmitting circuits and a receiving section having a plurality of internal signal transmitting circuits, each of the internal signal receiving circuits receives the internal signal input in response to information indicating whether or not an internal equipment is connected to an internal line. It has an alarm output prohibition circuit that disconnects and disconnects the transmission of detection information from the disconnection detection circuit within the station.

[0006]

EXAMPLES Next, the present invention will be explained with reference to the following.

FIG. 1 is a block diagram of one embodiment of the present invention. In this embodiment, for example, when the in-office signal input terminal A1 is connected to the in-office partner device, information indicating that the in-office partner device is connected is input from the in-office connection information input terminal F1, and in response to this, the alarm output prohibition circuit 3 causes the output information of the local signal input disconnection detection circuit 2 to be output as is to the alarm output terminal G1.

[0008] Furthermore, when the in-office signal input terminal A1 is not connected to the in-office partner device, information indicating that the in-office partner device is not connected is input from the in-office information input terminal, and in response to this, the alarm output prohibition circuit 3: The output of the alarm signal generated by the local signal input disconnection detection circuit 2 to the alarm output terminal G1 is prohibited.

Therefore, in this embodiment, there is no need to manually check whether or not the other party's device is connected or to operate a switch.
It is possible to automatically set the connection/disconnection of the internal signal input disconnection alarm depending on the connection state of the internal partner device.

0010

[Effects of the Invention] As explained above, the present invention makes it possible to automatically set the intra-office transmission of a signal input disconnection alarm based on information indicating the presence or absence of a connection to a partner device within the office, thereby eliminating the need for manual confirmation. There is an effect that no operation is required, and it is possible to reliably set whether or not to send an alarm within the station.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram of a conventional device.

[Explanation of symbols]

11, 13 Transmission section 12, 24 Receiving section 1, 4 In-station signal receiving circuit 2　　　Internal signal input disconnection detection circuit 3 Alarm output prohibition circuit 5 Multiplexing circuit 6 Electrical/optical conversion circuit 8. Optical/electrical conversion circuit 9 Separation circuit 10 In-station signal transmission circuit

Claims (1)

[Claims] Claim 1: A plurality of local signal receiving circuits, each having a local signal input disconnection detection circuit for detecting the presence or absence of an electrical signal input from an internal line, and multiplexing of the electrical signals received by each local signal receiving circuit. a transmitting section having a multiplexing circuit for converting the multiplexed electrical signal into an optical signal; and an optical-to-electrical conversion circuit for converting the optical signal received from the transmission path into an electrical signal. , an optical multiplexing terminal comprising a separating circuit that separates the converted electrical signal into a plurality of local signals, and a receiving section that has a plurality of local signal transmitting circuits that respectively send out the plurality of local signals to local lines. In the station equipment, each of the internal signal receiving circuits has an alarm output prohibition circuit that disconnects internal transmission of the detection information of the internal station signal input disconnection detection circuit in response to information indicating whether or not an internal unit is connected to the internal line. Optical multiplexing terminal equipment characterized by: