Also, when transmitting processing signals to another functional unit, the functional units included in the software unit 101 (i.e., the device dependent app unit 102 and the device independent app unit B 201b) add destination information to the processing signals and transmit the processing signals to the signal collecting/separating unit 160.

Note that configurations of the other functional units of the communication system 1d are the same as the configurations of the functional units of the communication system 1a according to the first embodiment, and therefore the functional units are denoted with the same reference signs as those used in the first embodiment, and descriptions thereof are omitted.

As described above, in the communication system 1d according to the fourth embodiment of the present invention, communication between the functional units need not be performed via the OLT function management unit 200 that is included in a remote device 20d-2. Therefore, the communication system 1d can suppress occurrence of communication delay.

The following describes a fifth embodiment of the present invention with reference to the drawings.

Configuration of Communication System

The following describes the functional configuration of a communication system 1e.

FIG. 8 is a block diagram showing the functional configuration of the communication system 1e according to the fifth embodiment of the present invention.