Abstract: A communication system includes a network cradle provided on a network, and a handy terminal connected to the network through the network cradle. The handy terminal includes a control unit generating a header in an IP protocol including a MAC address of the handy terminal as a transmission source MAC address, generating first data obtained by adding the header to data to be transmitted, and generating second data obtained by adding a header in a P2P protocol to the first data, and a communication unit transmitting the second data to the network cradle by the P2P protocol. The network cradle includes a mobile terminal communication unit that receives the second data transmitted from the handy terminal, and a network communication unit transmitting the first data obtained by removing the header in the P2P protocol from the second data, to the network.

Abstract: An indoor running machine comprising a machine body having a drum accommodating section formed at the front edge; a vertically movable footboard provided on top of the body on the rear end side of the drum accommodating section and spring biased in the upward direction; a ratchet gear provided within the body and adapted to rotate pitch by pitch with the vertical movement of the footboard; and a rotary drum provided within the drum accommodating section of the body and adapted to be coupled to the rotation of the ratchet gear via a series of large and small transmitting gears. The outer periphery of the rotary drum is provided with a colored indicating surface of increasing width from one end to the other end in the direction of the axis opposite to the direction of rotation.