Patent ID: 8363709

Claim:
A transmission apparatus comprising: a test signal control unit that copies a test signal of a pseudo-random bit sequence and controls insertion of the same test signal in each member of a plurality of members of a concatenation signal, the test signal control unit inserting the test signal with respect to entirety of the concatenation signal; a concatenation signal transmitting unit that transmits each member of the concatenation signal with the test signal inserted therein by the test signal control unit to other apparatus via a plurality of transmission paths; a concatenation signal receiving unit that receives from the other apparatus each member of a plurality of members of a concatenation signal; an individual-line-quality calculating unit that, using a test signal inserted in the members of the concatenation signal received by the concatenation signal receiving unit, individually evaluates each member of the concatenation signal received by the concatenation signal receiving unit and calculates a line quality of each transmission path; and an overall-line-quality calculating unit that calculates a line quality of entirety of the concatenation signal received by the concatenation signal receiving unit using the test signal inserted with respect to the entirety of the concatenation signal.