OTDR測(ce)試(shi)(shi)延(yan)長(chang)線(xian)與光(guang)纖跳(tiao)線(xian)類似,光(guang)纖中(zhong)(zhong)部沒有任何(he)熔接頭,一般放(fang)置在(zai)盒式結構中(zhong)(zhong),體積小,重(zhong)量輕,攜(xie)帶方便。在(zai)光(guang)纖測(ce)試(shi)(shi)過(guo)程中(zhong)(zhong),OTDR測(ce)試(shi)(shi)延(yan)長(chang)線(xian)主要用來(lai)彌補OTDR測(ce)試(shi)(shi)盲區。