Multi-port device and control method thereof

Abstract

A multi-port device includes a communication port, a signal-to-noise ratio (SNR) monitor, and a transmission power controller. The communication port is coupled to a connected partner. The SNR monitor is coupled to the communication port for monitoring the training SNR of the communication port in training mode. The transmission power controller is coupled to the SNR monitor for generating a power backoff value for the connected partner, at least based on the training SNR. The communication port is used to adjust the transmission power of the connected partner based on the power backoff value.

Claims

1. A control method for a multi-port device, comprising: In a training mode, the noise ratio of a training signal on a communication port is monitored; At least based on the training signal noise ratio, a power backoff value is generated for a connected partner of the communication port; and the communication port adjusts a transmission power of the connected partner based on the power backoff value so that the connected partner transmits a signal according to the adjusted transmission power.

2. The method as described in claim 1, wherein generating the power backoff value of the connected partner of the communication port based at least on the training signal-to-noise ratio includes: If the noise ratio of the training signal is less than a low threshold, reduce the power back-off value.

3. The method as described in claim 1, wherein generating the power backoff value of the connected partner of the communication port based at least on the training signal-to-noise ratio includes: If the noise ratio of the training signal is greater than a high threshold, increase the power back-off value.

4. The method as described in claim 1, further comprising: In this training mode, the signal-to-noise ratio of one channel of the communication port is monitored; And at least based on the channel signal-to-noise ratio, generate a channel power backoff value for the channel of the connected partner; wherein the communication port adjusts the transmission power of the connected partner based on the power backoff value by: the communication port transmitting the channel power backoff value to the connected partner to adjust the transmission power of the channel of the connected partner.

5. The method as described in claim 4, wherein generating the channel power backoff value for the channel of the interconnecting partner based at least on the channel signal-to-noise ratio includes: If the signal-to-noise ratio of the channel is less than a low threshold, the power back-off value is reduced to generate the channel power back-off value.

6. The method as described in claim 4, wherein generating the channel power backoff value for the channel of the interconnecting partner based at least on the channel signal-to-noise ratio includes: If the signal-to-noise ratio of the channel is greater than a high threshold, increase the power back-off value to generate the channel power back-off value.

7. The method as described in claim 1, further comprising: In this training mode, the frequency bin power ratio of the communication port is monitored. And apply the equalizer parameters to the equalizer of the communication port according to the power ratio of the frequency band.

8. The method as described in claim 7, wherein the equalizer parameter is an equalizer step size.

9. The method as described in claim 1, further comprising: In one data mode, monitor the transmission signal noise ratio of the communication port; A cross-port noise value is generated based on the transmission signal noise ratio and the training signal noise ratio; and a cross-port noise value and a noise threshold are used to determine whether to switch to the training mode.

10. A multi-port communication device, comprising: One communication port, coupled to a connection partner; A signal-to-noise ratio (SNR) monitor, coupled to the communication port, is used to monitor a training signal-to-noise ratio (SNR) of the communication port in a training mode; and a transmission power controller, coupled to the SNR monitor, is used to generate a power backoff value for the connected partner based at least on the training signal-to-noise ratio; wherein the communication port is used to adjust a transmission power of the connected partner based on the power backoff value, so that the connected partner transmits a signal according to the adjusted transmission power.

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