| 摘要 |
A Data Link is established for communicating messages between the first entity and the second entity via Information Frames communicated between a first Data Link Layer at the first entity and a second Data Link Layer at the second entity. An Information Frame addressed to the second Data Link Layer, preferably indicating a normal condition for the Data Link, is transmitted from the first Data Link Layer. The first and second Data Link Layers are reset if it is determined that a transmitted Information Frames fails to be communicated from the first Data Link Layer to the second Data Link Layer. An Information Frame addressed to the second Data Link Layer, preferably indicating a normal condition for the Data Link, is transmitted from the first Data Link Layer after the first and second Data Link Layers are reset. The Data Link preferably is maintained from the first step of transmitting through the second step of transmitting. Resetting preferably includes resetting the first Data Link Layer, communicating an Information Frame from the first Data Link Layer to the second Data Link Layer indicating a reset condition, resetting the second Data Link Layer in response to communication of the Information Frame to the second Data Link Layer indicating a reset condition, and communicating a frame acknowledging the reset condition from the second Data Link Layer to the first Data Link Layer. |
