| 摘要 |
PURPOSE: A multi-band two way line amplifier is provided to continually transmit and receive data in a frequency shadow area by maintaining the strength of transmitted and received wireless signals. CONSTITUTION: A first multiplexer(110) separates a plurality of signals outputted from a first RF(Radio Frequency) switch unit. A distribution apparatus(120) distributes a normal operation confirmation signal to a first and a second distribution signal. An amplifier(130) amplifies a control signal or a data signal having different frequency bands outputted from the first multiplexer. A second multiplexer(170) combines the amplified data signal or the control signal outputted from the amplifier with the second distribution signal outputted from the distribution apparatus. A second RF switch unit(180) controls a signal outputted from the second multiplexer. [Reference numerals] (120) Distribution apparatus; (121,AA,GG) Modem; (BB,HH) FM; (CC,II) VHF; (DD,JJ) DMB; (EE,KK) Train protection; (FF,LL) TRS
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