Abstract: According to one embodiment, a power line communication adaptor includes a power converter section which coverts an AC voltage supplied from a power line to a DC voltage driving a communication terminal, a signal converter which demodulates a communication signal superimposed on the AC voltage, which converts the demodulated communication signal for supply to the communication terminal, and which converts the communication signal that is supplied from the communication terminal to a signal for supply to the power line, a connector being to be connected to a cable configured to transmit a DC voltage supplied from the power converter and a signal for communication between the signal converter and the communication terminal; and a controller which determines whether or not the DC voltage is supplied to the communication terminal and which controls supply of the DC voltage to the connector in response to the determination result.

Abstract: A communication control apparatus for executing a data transfer process between an external network and an internal network, includes a first port connected to the internal network, a second port connected to the external network, a storage unit, a determining unit which determines whether or not information to specify an operation environment of the communication control apparatus relating to a data transfer process of network layer level is stored in the storage unit, and an executing unit which executes the data transfer process at the network layer level between the first port and the second port based on the information when the determining unit determinates that the information is stored in the storage unit and executes a data transfer process at data link layer level between the first port and the second port when the determining unit determinates that the information is not stored in the storage unit.

Abstract: Each network control section sequentially writes, into a common memory, data items included in a transmission frame output from each network, outputs a notification to notify start of writing and a notification to notify completion of normal writing, reads the transmission frame stored in the common memory in response to a transmission command, and transmits the read transmission frame to a corresponding network. When a C.T mode is set, a route control section receives the notification to notify start of writing from each network control section, and outputs a transmission command to a network control section corresponding to a destination network designated by a destination address included in the transmission frame. Further, when an S.