KR930001613A - Loopback Control Circuit of Transmitter - Google Patents

Abstract

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Description

Loopback Control Circuit of Transmitter

Since this is an open matter, no full text was included.

1 is a block diagram of the present invention.

2 is a block diagram of the transmitter of FIG.

7 is a block diagram of the receiver of FIG.

9 is a detailed circuit diagram of the control logic unit in FIG.

Claims (2)

1. A digital transmission apparatus, comprising: a transmitter (1 or 20) for generating a predetermined DTMF signal according to a station address or command code designation state, and a multi-flag for selectively outputting transmission data (TD) and DTMF signals input from a data generator. A processor 2, a photoelectric converter 6 for converting an optical signal received from the repeater 200 into an electrical signal, a receiver 4 for decoding a DTMF signal and generating a call command reception signal and a loopback command signal; And a demultiplexer (3) for transmitting the photoelectrically changed signal to a data analyzer (not shown) and the receiving unit (4), and the output of the photoelectric converter (6) or the multi according to the state of the loopback command signal. A first stage comprising a switch SW1 for selecting the output of the flexor 2 and an all-optical converter 5 for converting an electrical signal supplied from the switch SW1 into an optical signal and transmitting the optical signal to the repeater 200 (100) A second end station 120 having the same configuration as the first end station 100, a photoelectric converter 7, 10 and an all-optical converter 8 and 12, a signal transmission unit 10 for outputting a signal input from the photoelectric converter 7 to the receiver 9 or to the all-optical converter 8 or the all-optical converter 12, and the photoelectric. Signals input from the converter 13 and the transmitter 14 The signal transmitter 10 outputted to the all-optical converters 8 and 12 or the receiver 9 and a loopback command signal generated from the receiver 9 A switch (SW2) for selectively transferring one of the outputs of the two signal transmission units (10, 11) or the photoelectric converter (7) to the all-optoelectric converter (8) and the state of the loopback command signal Accordingly, one of the outputs of the two signal transmitters 10 and 11 or the photoelectric converter 13 may be selectively used. Loop-back control of the transport device, characterized by consisting of a repeater 200 is made of a switch (SW2) to pass to the vent (12) circuit. The display unit (22) according to claim 1, wherein the transmission units (1, 14, 20) designate a designation unit (21) for designating a station address or command code, a display unit (22) for displaying a designation state of the station address or command code; A loopback control circuit of a transmission device comprising a DTMF generator 23 for outputting a designated state of a station address or command code as a DTMF signal, and an analog / digital converter 24 for converting the DTMF signal into a digital form. . ※ Note: The disclosure is based on the initial application.