According to the present invention, methods and apparatus are provided improving data transfers between a host and a tape device on fibre channel fabrics connected through an IP fabric. The appliance must also be configured to communicate by electronic message. Introduced herein is a novel \u201cresource adaptive\u201d algorithm for spectrum and periodicity estimation on a continuous stream of data. Each of the plurality of slave memory chips are selected using a multiplexing unit to retrieve data using the emergency driver module. The facsimile machine includes a function for setting and changing the communication port to be used by the facsimile machine itself, and a function for changing a port transfer setting of the router so that a packet addressed to the set and changed communication port is transferred to the facsimile machine itself.