JPH07177122A - Time division multiplex signal transmitter - Google Patents

Abstract

PURPOSE:To attain multiplex transmission to a signal plural kinds of transmission speeds by using a clock frequency as a control signal switching and selecting a time division multiplexer or a time division demultiplexer in matching with a transmission speed. CONSTITUTION:When a digital input signal is applied to an input terminal in a serial form respectively, the route of the signal is selected by changeover devices 3-1 to 3-n corresponding to a control signal selecting and instructing an output route given from a control signal input terminal 2 and the signal is subjected to time division multiplexing by any of time division multiplexers 4-1 to 4-n. In this case, the control signal is used to selected the time division multiplexer suitable for the transmission speed of the input signal and a changeover device 5 is used to select the transmission signal and it is subjected to electrooptic conversion. Then a clock identification circuit 10 extracts a clock included in the signal converted by a photoelectric converter 8 and generates a control signal used to select any of time division demultiplexers 12-1 to 12-n. Then the signal demultiplexed by the selected time division demultiplexer is outputted from changeover device 13-1 to 13-n to an output terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplexing signal transmission device used in a signal transmission system.

[0002]

2. Description of the Related Art A conventional time division multiplex signal transmission device of this type is, as illustrated in FIG. 2, input terminals 1-1 to 21.
-N connected to the time division multiplexer 22, the electro-optical converter 2
3, the optical fiber 24, the photoelectric converter 25, and the time-division separator 2 connected to the output terminals 27-1 to 27-n
6 are connected in cascade.

In such a structure, the input terminal 21-
When an input signal is supplied to each of 1 to 21-n,
The time-division multiplexer 22 time-division multiplexes the electric-optical converter 2
3 is converted into an optical signal, transmitted through the optical fiber 24, and then converted back into an electric signal by the photoelectric converter 25,
The time division demultiplexer 26 demultiplexes the multiplexed signals and outputs the demultiplexed signals to the output terminals 27-1 to 27-n, respectively.

[0004]

The above-mentioned conventional time-division multiplex signal transmission device has a drawback in that only signals of one predetermined transmission rate can be multiplexed and transmitted.

[0005]

The time division multiplex signal transmission apparatus of the present invention receives a serial-type digital input signal for each and switches in response to a first control signal representing one of a plurality of transmission ends. A plurality of first switching devices to be transmitted, a plurality of time-division multiplexers of different frequencies for time-division-multiplexing each output signal of the first switching device, and output signals of the time-division multiplexer. A second switch for selecting and sending one of the signals, an electro-optical converter for converting an electric signal sent by the switching signal into an optical signal, an optical fiber for transmitting the optical signal, and the optical signal A photoelectric converter for converting into an electric signal, a clock extractor for extracting a clock component from the converted electric signal, and a third for switching the electric signal from the photoelectric converter to one of a plurality of sending ends. Switcher of the above and extracted Wherein according to the frequency of the locking third
A clock discriminating circuit for generating a second control signal for switching the switch, a plurality of time division separators for receiving the output signal of the third switch to separate the time division multiplex, and the second. And a plurality of fourth switching devices for selectively selecting and outputting one of the output signals of the time division separator according to the control signal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, reference numerals 1-1 to 1-n
Is an input terminal, 2 is a control signal input terminal, 3-1 to 3-
n is a switch, 4-1 to 4-n is a time division multiplexer, 5 is a switch, 6 is an electro-optic converter, 7 is an optical fiber, 8 is an opto-electric converter, 9 is a clock extractor, 10 is A clock discrimination circuit, 11 is a switch, 12-1 to 12-n are time division separators, 13-1 to 13-n are switchers, and 14-1 to 14-n are output terminals.

In operation, when a digital input signal is supplied in serial form to each of the input terminals 1-1 to 1-n, the switching device is selected according to the control signal for selecting the output route from the control signal input terminal 2. 3-1 to 3-
n, and each of them is connected to any one of the time division multiplexers 4-1 to 4-n and time division multiplexed. At this time, the control signal selects one of the time division multiplexers 4-1 to 4-n that matches the transmission rate of the input signal, and also outputs one of the time division multiplexers 4-1 to 4-n. Is selected by the switch 5 and sent to the electro-optical converter 6. The transmitted signal is converted into an optical signal by the electro-optical converter 6 and transmitted by the optical fiber 7. The opto-electric converter 8 returns the optical signal to an electric signal, the clock extractor 9 extracts the clock contained in the electric signal, and the clock discriminating circuit 10 operates the time division demultiplexers 12-1 to 12-n. A control signal for selecting any one is generated to switch the switches 11 and 13.
-1 to 13-n, and the signal separated by one of the time division separators 12-1 to 12-n is switched by the switch 13
-1 to 13-n to output terminals 14-1 to 14-
output to n.

As described above, the time division multiplexers 4-1 to 4-
n and time division separators 12-1 to 12-n are selected and provided so as to be suitable for any one of a plurality of types of transmission rates, so that signals of a plurality of types of transmission rates are multiplexed. A device that can be transmitted is obtained.

[0010]

As described above, according to the present invention, a clock frequency is used as a control signal, and a time division multiplexer and a separator are switched and selected, whereby signals of a plurality of transmission rates are multiplexed and transmitted. it can.

[Brief description of drawings]

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

FIG. 2 is a block diagram illustrating a conventional time division multiplex signal transmission device.

[Description of Reference Signs] 1-1 to 1-n input terminal 2 control signal input terminal 3-1 to 3-n switcher 4-1 to 4-n time division multiplexer 5 switcher 6 electro-optical converter 7 optical fiber 8 photoelectric converter 9 clock extractor 10 clock identification circuit 11 switcher 12-1 to 12-n time division separator 13-1 to 13-n switcher 14-1 to 14-n output terminal

Claims (2)

[Claims] 1. A first input for receiving each serial-type digital input signal and representing one of a plurality of output terminals.
A plurality of first switchers for switching and transmitting according to the control signal, a plurality of time-division multiplexers of different frequencies for time-division-multiplexing each output signal of the first switcher, and the time-division multiplexer. Second switch for selecting and sending one of the output signals of the converter, an electro-optical converter for converting the electric signal sent by the switching signal into an optical signal, and an optical fiber for transmitting the optical signal An opto-electric converter for converting the optical signal into an electric signal, a clock extractor for extracting a clock component from the converted electric signal, and an electric signal from the opto-electric converter among a plurality of sending ends. A third switch for switching to one, and the third switch according to the frequency of the extracted clock
A clock discriminating circuit for generating a second control signal for switching the switch, a plurality of time division separators for receiving the output signal of the third switch to separate the time division multiplex, and the second. A time-division multiplex signal transmission device, comprising: a plurality of fourth switching devices for selectively switching and outputting one of the output signals of the time-division separator according to a control signal. 2. The time division multiplexed signal transmission device according to claim 1, wherein the first control signal is a clock component of the digital input signal.