JP2933480B2 - Time division multiplex signal transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

In such a configuration, the input terminal 21-
When an input signal is supplied to each of 1 to 21-n,
The signal is time-division multiplexed by the time-division multiplexer 22 and the electro-optical converter 2
After being converted into an optical signal at 3 and transmitted via the optical fiber 24, it is converted back to an electrical signal at the photoelectric converter 25,
The multiplexed signal is separated by the time division separator 26 and output to the output terminals 27-1 to 27-n.

[0004]

The above-described conventional time-division multiplex signal transmission apparatus has a disadvantage that multiplex transmission can be performed only with a signal having a predetermined transmission rate.

[0005]

SUMMARY OF THE INVENTION A time division multiplexed signal transmission apparatus according to the present invention receives a digital input signal in a serial format and switches in response to a first control signal representing one of a plurality of transmission ends. A plurality of first switches to be transmitted, and a transmission rate of each output signal of the first switches.
A plurality of time-division multiplexers, a second switch for selecting and transmitting one of the output signals of the time-division multiplexer, and an electric signal transmitted by the switch. To an optical signal, an optical fiber for transmitting the optical signal, an optical-electrical converter for converting the optical signal to an electric signal, and a clock extraction for extracting a clock component from the converted electric signal. A third switch for switching an electric signal from the photoelectric converter to one of a plurality of sending ends, and a third switch for switching the third switch according to the frequency of the extracted clock. a clock discriminating circuit for generating a second control signal, and a plurality of time division separator for separating division multiplexed signal when receiving the output signal of said third switching unit, according to said second control signal Of each output signal of the time-division separator. And a plurality of fourth switching unit for one selectively switched to output.

[0006]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one 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, and 3-1 to 3-
n is a switch, 4-1 through 4-n are time division multiplexers, 5 is a switch, 6 is an electro-optical converter, 7 is an optical fiber, 8 is an opto-electric converter, 9 is a clock extractor, 10 is A clock discriminating circuit, 11 is a switch, 12-1 to 12-n are time division separators, 13-1 to 13-n are switches, and 14-1 to 14-n are output terminals.

In operation, when a digital input signal is supplied to each of the input terminals 1-1 to 1-n in a serial format, a switch is provided in accordance with a control signal for selecting an output route provided from the control signal input terminal 2. 3-1 to 3-
n, and each 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 suitable for the transmission rate of the input signal, and 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 transmission 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 converts the optical signal back to an electric signal, and the clock extractor 9 extracts the clock contained in the electric signal. A control signal for selecting one of them is generated, and switchers 11 and 13 are generated.
-1 to 13-n, and a signal separated by one of the time division separators 12-1 to 12-n is supplied to the switch 13
-1 to 13-n to output terminals 14-1 to 14-
n.

As described above, the time division multiplexers 4-1 to 4-
n and the time division demultiplexers 12-1 to 12-n are selected and provided so as to conform to any one of a plurality of transmission speeds, so that signals of a plurality of transmission speeds can be multiplexed. A device capable of transmission is obtained.

[0010]

As described above, according to the present invention, a signal having a plurality of transmission rates is multiplexed by using a clock frequency as a control signal and switching and selecting a time division multiplexer and a separator. it can.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 1-1 to 1-n input terminal 2 control signal input terminal 3-1 to 3-n switch 4-1 to 4-n time division multiplexer 5 switch 6 electro-optical converter 7 optical fiber 8 opto-electric converter 9 Clock Extractor 10 Clock Identification Circuit 11 Switch 12-1 to 12-n Time Division Separator 13-1 to 13-n Switch 14-1 to 14-n Output Terminal

Claims (1)

(57) [Claims] A first input terminal for receiving a digital input signal in serial form and representing one of a plurality of transmission ends;
A plurality of first switches for switching and transmitting according to the control signal of the first switching device, and a transmission rate for receiving each output signal of the first switching device.
A plurality of time-division multiplexers, a second switch for selecting and transmitting one of the output signals of the time-division multiplexer, and an electric signal transmitted by the switch. To an optical signal, an optical fiber for transmitting the optical signal, an optical-electrical converter for converting the optical signal to an electric signal, and a clock extraction for extracting a clock component from the converted electric signal. A third switch for switching an electric signal from the photoelectric converter to one of a plurality of sending ends, and a third switch for switching the third switch according to the frequency of the extracted clock. a clock discriminating circuit for generating a second control signal, and a plurality of time division separator for separating division multiplexed signal when receiving the output signal of said third switching unit, according to said second control signal Of each output signal of the time-division separator. Division multiplex signal transmitting apparatus when characterized by comprising a plurality of fourth switching unit for one selectively switched to output.