Transmission method, transmitter-receiver, and transmitting-receiving system

Abstract

A transmitter-receiver having a means for automatically determining the status of transmission medium such as optical fiber, and a means for automatically setting and resetting the transmission rate and / or output power according to the status of the transmission medium, a transmission loss and gain measurement method, and a transmitting-receiving system. A transmitter-receiver comprises at least: an output power controller for controlling the output power of a transmitter; an input power measuring section for measuring the strength of input signals; and an information processor for deriving the loss or gain of a path to change the output power of the transmitter and / or the rate of data transmission according to the derived loss or gain of the path. A transmission loss and gain measurement method applied to a system comprising transmission media and a plurality of the transmitter-receivers connected via the transmission media, comprises the steps of: transmitting information on the output power of a first transmitter-receiver from the first transmitter-receiver to a second transmitter-receiver; measuring reception strength by the second transmitter-receiver when the second transmitter-receiver receives the output power information; reading the output power information by the second transmitter-receiver; and comparing the reception strength with the output power information to calculate a transmission loss or gain by the second transmitter-receiver.

Description

[0001]This present application is a Divisional of U.S. application Ser. No. 10 / 971,047, filed Oct. 25, 2004, which claims priority to Japanese Patent Application No. 367880-2003, filed Oct. 28, 2003. The entire disclosures of the prior applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a transmitter-receiver for communication, and more particularly, to a transmitter-receiver having a means for determining the status of a channel so as to be capable of selecting and changing the transmission rate and output power for transmission / reception according to the status of the channel, a transmission loss and gain measurement method, and a transmitting-receiving system.BACKGROUND OF THE INVENTION[0003]In general, data is transmitted and received between two opposed transmitter-receivers via transmission media. FIG. 1 is a diagram showing an example of optical transmitter-receivers that transmit and receive optical signals through o...

AI Technical Summary

Benefits of technology

[0023]The transmitter-receiver may further comprise an output power controlling unit for controlling output power for transmitting the output power information so that the output power is not to exceed the maximum permissible input power of another transmitter-receiver at the receiving end.

[0037]The communication data processor may further include: a plurality of data input-output ports (I / O ports); a unit for multiplexing data in the data I / O ports to transmit the data; a unit for demultiplexing input data to output the data to the I / O ports; a unit for increasing or decreasing the number of multiplexing when data in the data I / O ports are multiplexed.

Problems solved by technology

The conventional optical transmitter-receiver, however, has some problems.

First, the transmitter-receiver does not have a function for automatically setting the transmission rate according to the status of a channel or the like.

Therefore, when the transmission loss is increased to a certain value, the optical transmitter-receiver is disabled for communication.

In other words, even when data can be communicated by reducing the transmission rate, the optical transmitter-receiver cannot adjust a transmission rate setting because of the fixed transmission rate.

Second, the conventional transmitter-receiver does not have a function for automatically setting output power according to the status of a channel or the like.

Third, the conventional transmitter-receiver does not have a means for determining the status of a transmission medium such as the loss of optical fiber.

For this reason, the renewal of the transmitter-receiver requires a considerable time, and also it is difficult to modify system configuration.

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