Communication device, link-up method, and communication system

摘要: In order to quickly and reliably establish link up, when a communication device detects power on or down, an idle signal generation circuit generates signal. Then, I/F transmits the which is partner through selection circuit. Further, receives learning signals from partner. A Step 1 circuit, 2 3 up by using signals. When not receiving detection indicating that established, reset mask generated allow them learn again.