Patent ID: 11942992
Assignee: REALTEK SEMICONDUCTOR CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A control chip of a network device, the network device receiving an input signal from a link partner through a fiber medium, the control chip comprising:
an analog front-end (AFE) circuit configured to receive the input signal;
a control circuit configured to generate a speed setting signal according to a first speed and a detection signal, wherein the detection signal represents an amplitude or energy of the input signal; and
a media selection unit coupled to the control circuit and configured to determine a target speed of the network device according to the speed setting signal;
wherein when the detection signal indicates that the amplitude or energy of the input signal is greater than a threshold, the control circuit controls, through the speed setting signal, the media selection unit to select the first speed as the target speed, and when the detection signal indicates that the amplitude or energy of the input signal is not greater than the threshold, the control circuit controls, through the speed setting signal, the media selection unit to select a second speed as the target speed and transmits an Idle code group or IDLE ordered sets at the second speed to notify the link partner that an up-link to the link partner remains, the second speed being different from the first speed;
wherein the link partner is not operating at the second speed when the Idle code group or IDLE ordered sets is being transmitted.