Communications apparatus and congestion control method

A communications apparatus for switching among different interfaces and comprising a switch unit, the switch unit comprising:

• a main switch for switching data of a fixed length;
• and
• an interface having a first buffer for an input of the main switch and a second buffer for an output of the main switch,
• wherein the communications apparatus further comprises a processor that is connected to the switch unit and processes data according to a predetermined protocol, the processor having a third buffer and a fourth buffer connected to the first buffer and the second buffer, the processor performing back pressure control on the first buffer when the fourth buffer assumes a predetermined state.

A communications apparatus for switching among different interfaces and comprising a switch unit, the switch unit comprising:

• a main switch for switching data of a fixed length;
• and
• an interface having a first buffer for an input of the main switch and a second buffer for an output of the main switch,
• wherein the communications apparatus further comprises a processor that is connected to the switch unit and processes data according to a predetermined protocol, the processor having a third buffer that is connected to the first buffer and having a fourth buffer connected to the second buffer, the processor performing back pressure control on the fourth buffer when receiving a request for back pressure control from an apparatus that is connected to the processor, and the processor further performing back pressure control on the first buffer when the fourth buffer assumes a predetermined state.

A communications control method for switching among different interfaces, the communications control method being performed by a communications apparatus that includes a switch unit and a processor connected to the switch unit processing data according to a predetermined protocol, the method comprising the steps of:

• the switch unit switching data of a fixed length after once buffering the data into a first buffer;
• and
• the switch unit outputting the switched data after once buffering the switched data into a second buffer;
• wherein the processor includes a third buffer connected to the first buffer and a fourth buffer connected to the second buffer, and the processor performs back pressure control on the first buffer when the fourth buffer assumes a predetermined state.