Patent ID: 7808933

Claim:
A cascade-type multiplex radio communication relay system, comprising: a donor for separating a Radio Frequency (RF) communication signal, input from an antenna in a downstream direction, into two different RF communication signals, separately converting the two different RF communication signals into digital communication signals, converting the two different RF communication signals, which have been separately converted, into a single Unshielded Twisted Pair (UTP) transmission frame, outputting the UTP transmission frame to a Main Hub Unit (MHU) through a UTP cable, converting a UTP transmission frame, input from the MHU through the UTP cable in an upstream direction, into two different digital communication signals, separately converting the digital communication signals into two different RF communication signals, and outputting the two different RF communication signals, which have been separately converted, to the antenna in an upstream direction; the MHU for converting the UTP transmission frame, input from the donor through the UTP cable in a downstream direction, into a digital communication signal, separating and converting the digital communication signal into a plurality of UTP transmission frames, separately outputting the UTP transmission frames to a plurality of Remote Units (RUs) through UTP cables, separately converting a plurality of UTP transmission frames, input from the RUs through the UTP cables in an upstream direction, into a plurality of digital communication signals, combining the plurality of digital communication signals into a single digital communication signal, converting the combined digital communication signal into a UTP transmission frame, and outputting the UTP transmission frame to the donor through the UTP cable in an upstream direction; and the plurality of RUs, each converting a UTP transmission frame, input from the MHU 200 through a corresponding UTP cable in a downstream direction, into two different digital communication signals, separately converting the two different digital communication signals into RF communication signals, outputting the RF communication signals, which have been separately converted, to a corresponding antenna in a downstream direction, separating an RF communication signal, input from the antenna in an upstream direction, into two different RF communication signals, separately converting the two different RF communication signals into digital communication signals, converting the digital communication signals into a single UTP transmission frame, and outputting the UTP transmission frame to the MHU through a corresponding UTP cable in an upstream direction.