LAN interface

A LAN interface comprising:

• a terminal connected to an I/O bus;
• said LAN interface being connected to said I/O bus;
• said LAN interface including:
• a LAN controller for processing a signal transmitted from said terminal and then transmitting a processed signal to a counter device, and for processing a signal transmitted from said counter device and then transmitting a processed signal to said connection device;
• an isolation section connected between said LAN controller and said I/O bus, for electrically disconnecting said LAN controller from said I/O bus;
• an analog circuit connected between said LAN controller and said connection port, for subjecting a transmission signal and a received signal to an analog process;
• and
• a frame detector for operating on a predetermined voltage supplied via said I/O bus and detecting the presence or absence of a frame, based on a signal from said counter device connected to said connection port;
• wherein said frame detector, when detecting a frame, controls the LAN controller and the isolation section to controllably bring them to an operation state thereof and, when not detecting a frame, controls the LAN controller and the isolation section to controllably bring them to a non-operation state.

A LAN interface comprising:

• a LAN controller for processing a signal transmitted from a terminal connected to an I/O bus and then transmitting a processed signal to said counter device, and for processing a signal transmitted from said counter device and then transmitting a processed signal to said connection device;
• a separator connected between said LAN controller and said I/O bus, for electrically disconnecting said LAN controller from said I/O bus;
• and
• a link pulse detector for operating on a predetermined voltage supplied via said I/O bus and detecting a link pulse from said counter device connected to said connection port;
• wherein said link pulse detector, when detecting a link pulse output from the counter device, controls the LAN controller and the isolation section to controllably bring them to an operation state thereof and, when not detecting a link pulse output from the counter device, controls the LAN controller and the isolation section to controllably bring them to a non-operation state.

A LAN interface comprising:

• a LAN controller for processing a signal transmitted from a terminal connected to an I/O bus and then transmitting a processed signal to said counter device, and for processing a signal transmitted from said counter device and then transmitting a processed signal to said connection device;
• a separator connected between said LAN controller and said I/O bus, for electrically disconnecting said LAN controller from said I/O bus;
• and
• a frame detector for operating on a predetermined voltage supplied via said I/O bus and detecting the presence or absence of a frame based on a signal from said counter device connected to said connection port;
• wherein said frame detector, when detecting a frame, controls the LAN controller and the isolation section to controllably bring them to an operation state thereof and, when not detecting a frame, controls the LAN controller and the isolation section to controllably bring them to a non-operation state.