KR960012975B1 - Transmitter & receiver for isdn - Google Patents

Abstract

an opto-transmitting device wherein the broadcasting data from a cell receiver is multiplexed in a multiplexer unit(3), and converted to an optical signal by an opto-transmitter unit(4) after transformed to two differential signals in a transmitter, then outputted to multiple outports simultaneously using an opto-coupler(6); an opto-receiving device wherein the light signal from an opto-coupler is transformed to two differential electrical signals in an opto-receiver(11), and is extracted as the data and clock signal in a receiving unit(10), then demultiplexed as an output bit of a cell transmitter in a demultiplexer unit(9) so as to provide a high quality ISDN service using opto-electronic devices.

Description

Broadcasting type optical transmission and reception device of physical layer that provides broadcasting type distribution service in subscriber access network of broadband integrated information communication network

1 is a diagram of a broadband access information network subscriber access network to which the broadcast type optical transmission and reception apparatus of the present invention can be applied.

2 is a block diagram of an interface between a broadcast optical transmitter and a cell transmitter and a broadcast optical transmitter according to the present invention.

3 is a structural diagram of an interface between a broadcast optical receiver and a cell receiver and a broadcast optical receiver according to the present invention.

4 is an operation timing diagram of a multiplex (Mux) and a cell transmitter according to the present invention.

5 is an operation timing diagram of a demultiplex (Dmx) and a cell receiver according to the present invention.

* Explanation of symbols for main parts of the drawings

1: optical transmitter, 2: optical receiver,

3: Multiplexer (Mux), 4: Transmitter (Tx),

5: optical transmitter (O-Tx), 6: optical coupler (O-Coupler),

7: cell transmitter, 8: cell receiver,

9: demultiplexer (Dmx), 10: receiver (Tx),

11: optical receiver (O-Rx)

The present invention relates to a broadcast type optical transmission and reception apparatus of a physical layer capable of providing a high quality broadcast type service in a subscriber access device of a broadband integrated information communication network.

In a subscriber access device of a conventional communication network, a broadcast service can be provided by using a switching element having a broadcasting function. However, in this case, due to a problem of the electrical switching element, that is, a signal drive capability or a bandwidth, It is difficult to geographically disperse a shape, and it is difficult to accommodate data requiring a wide bandwidth of 100Mbps or more, such as a moving picture.

In order to solve the above problems, the present invention solves the problem of transmission distance and bandwidth by using optical elements with short transmission distance and narrow bandwidth, and broadcast type distribution service in subscriber access network of broadband integrated information communication network which can achieve high quality service. An object of the present invention is to provide a broadcast type optical transmission and reception apparatus of a physical layer.

According to an aspect of the present invention, there is provided a multiplexing means for receiving broadcast data from a cell transmitter and multiplexing the same, and transmitting the multiplexed data from the multiplexing means and converting the data into two differential signals. Optical transmission means for receiving two electrical differential signals from a transmission means and converting them into optical signals, and optical coupler means for receiving optical signals from the optical transmission means and simultaneously outputting them to a plurality of output ports. An optical transmitter; Optical receiving means for receiving an optical signal from the optical coupler means and converting the optical signal into two differential signals; and receiving means for extracting a clock and data from the two differential signals input from the optical receiving means; And a demultiplexing means for receiving data from the receiving means and demultiplexing the data into output bits of the cell transmitter and outputting the demultiplexing means to a cell receiver.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

FIG. 1 is one of the shape diagrams of various broadband subscriber access networks to which the broadcast type optical transmission and reception apparatus of the present invention can be applied.

SB and TB specified in FIG. 1 are interfaces of the broadband integrated telecommunication network defined by CCITT, the international standardization organization, and are connected to the broadband integrated telecommunication network through SB, and TB is an interface connected to the broadband switch. Here, the SB to the TB constitute a broadband subscriber access network. In this configuration, a subscriber of a broadband subscriber access network can communicate with an external subscriber of a broadband subscriber access network through a TB, and internal communication with a subscriber of the same broadband subscriber access network is possible. This shape is cable tee. It is a shape suitable for providing a broadcast service to all subscribers of the broadband subscriber access network from a broadcasting center outside the broadband subscriber access network such as CATV.

In the shape shown in FIG. 1, the broadcast information from the broadcasting center is transmitted through the network via the internal functional block of the node A and simultaneously through the broadcast type optical transmitter 1 of the present invention. Broadcast to device (2). As such, by applying the broadcast type, the optical transmission, and the reception apparatus of the present invention to a device configuring the broadband subscriber access network, it is possible to provide a high quality broadcast type service in the broadband subscriber access network.

2 is a structural diagram of a broadcast optical transmitter according to the present invention, in which the broadcast optical transmitter includes a multiplexer (Mux) 3, a transmitter (Tx) 4, an optical transmitter (O_Tx) 5, and an optical coupler ( O_Coupler) 6.

The broadcast optical transmitter of the present invention receives broadcast data from the cell transmitter 7 (a block connected to the transmitter in Node A and transmits broadcast data to the transmitter) and broadcasted to the broadcast optical receiver of the present invention. The process of transmitting data is as follows.

First, the multiplexer 3 receives broadcast data from the cell transmitter 7 at a rate of 31.25 MHz through DATAI, which is a 32-bit data signal line. Data transmission and reception between the cell transmitter 7 and the multiplexer 3 is performed according to the operating conditions of RDYI and STRBI, which are signal lines for data transmission and reception with an external module included in the multiplexer 3.

The operation timing relating to this is described in FIG. 4, where STRBI is a signal indicating that the cell transmitter 7 has data to be sent to the multiplexer 3, and RDYI indicates that the multiplexer 3 is the cell transmitter 7 This is a signal that you are ready to receive data. CLK45I is also a reference clock provided from the multiplexer 3 to the cell transmitter 7.

Referring to the operation timing diagram of FIG. 4, the operation of the cell transmitter 7 and the multiplexer 3 will be described. The cell transmitter 7 outputs the STRSI signal while the RDYI signal output from the multiplexer 3 is 'high'. The change from 'low' to 'high' is output to the multiplexer 3 so that 32-bit data is latched to the multiplexer 3.

The multiplexer (3) multiplexes the received data into 8 bits using an internal 32-to-8 multiplexer, and then encodes the multiplexed 8 bits of data into 10 bits of data and supplies 123 MHz from the outside using an oscillator. The transmission is transmitted to the transmitter 4 in synchronization with the transmission clock TCLK clock.

The transmitter 4 converts the received 10-bit data into two differential signals, and transmits the data to the optical transmitter 5 at a speed of 1.26 Gbps in synchronization with a clock of 10 times TCLK.

The optical transmitter 5 converts the received electrical signal into an optical signal and transmits it to the MxN optical coupler 6, and the optical coupler 6 transmits the received optical signal through M output ports. Send data to the receiver.

In the above, the broadcast type optical transmitter of the present invention receives broadcast data from a cell transmitter and transmits the broadcast data to the broadcast type optical receiver of the present invention.

3 is a structural diagram of a broadcast optical receiver according to the present invention. The broadcast optical receiver includes a demultiplexer (DMUX) 9, a receiver (Rx) 10, and an optical receiver (O_Rx) 11.

The broadcast type optical receiver of the present invention receives broadcast data from the optical transmitter of the present invention and is connected to the broadcast type optical receiver of the present invention at the cell receiver 8 (node B, node C, node D) and broadcast data. Is transmitted to the block).

First, the optical receiver 11 receives an optical signal sent from the optical coupler 6 of the broadcast optical transmitter through an optical fiber, and then converts the optical signal into two electrical differential signals to the receiver 10. do.

The receiver 10 operates a commercially-available phase locked loop (PLL) circuit to extract clock and data from a serial data sequence of 1.25 Gbps sent from the optical receiver 11, and then divides the extracted clock by 10 minutes to receive a 125 MHz reception clock ( RCLK). The received data is converted into 10 bits and transmitted to the demultiplexer 9 in synchronization with RCLK.

The demultiplexer 9 decodes the received 10-bit data into 8 bits and transmits the data to the cell receiver 8 at a speed of 31.25 MHz through an internal 8-to-32 demultiplexer. At this time, data transmission and reception between the cell receiver 8 and the demultiplexer 9 are performed according to the operating conditions of RDYO and STRBO, which are signal lines for data transmission and reception with an external module included in the demultiplexer 9. The operation timing relating to this is described in FIG. 5, where STRBO is a signal indicating that the cell receiver 8 is capable of receiving data by the demultiplexer 9, and the RDYO demultiplexer 9 is a cell receiver 8 Is a signal indicating that it is ready to transmit data. The demultiplexer 9 also provides a reference clock CLK450 to the cell receiver 8.

Referring to the operation of the demultiplexer 9 and the cell receiver 8 with reference to the operation timing diagram of FIG. 5, the demultiplexer 9 receives data from the receiver 10, demultiplexes the data into 32-bit data, and then transmits the data. When ready, the RDYO signal is output from 'low' to 'high'.

When the RDYO signal is input 'high' from the demultiplexer 9, the cell receiver 8 outputs the STRBO signal to the demultiplexer 9 'high' to latch 32-bit data from the demultiplexer 9.

As described above, the present invention is connected to a cell transmitter and a cell receiver corresponding to a transmitting and receiving function processing unit of an ATM (Asynchronous Transfer Mode) layer in a subscriber access device configuring a broadband subscriber access network to a subscriber of a broadband subscriber access network. There is an effect that can provide a high quality broadcast service using the optical element.

Claims (1)

Multiplexing means (3) for receiving broadcast data from the cell transmitter (7) and multiplexing it and outputting it; Transmitting means (4) for receiving the multiplexed data from the multiplexing means (3) and converting it into two differential signals. Optical transmission means (5) for receiving two electrical differential signals from the transmitting means (4) and converting them into optical signals, and outputting a plurality of output signals received from the optical transmission means (5) An optical transmitting device having an optical coupler means 6 for simultaneously outputting to a port; Optical receiving means 11 for receiving an optical signal from the optical coupler means 6 and converting it into two electrical differential signals, and outputting clock and data from the two differential signals inputted from the optical receiving means 11. A demultiplexing means (9) for extracting and outputting the same, and demultiplexing means (9) for receiving data from the receiving means (10) and demultiplexing them into output bits of the cell transmitter (7) and outputting them to the cell receiver (8). And a broadcast type optical transmission and reception device of a physical layer for providing a broadcast type distribution service in a subscriber access network of a broadband general information communication network.