Patent ID: 6944132

Claim:
A transmission apparatus adapted to receive instructions from a remote monitoring control terminal, comprising: a multiplexing and demultiplexing section to carry out a multiplexing and a demultiplexing; and an order wire section to convert received order wire signals demultiplexed by said multiplexing and demultiplexing section into analog signals, and to convert transmitting order wire signals into digital signals which are input to said multiplexing and demultiplexing section, said order wire section comprising: a codec section to carry out an analog-to-digital conversion and a digital-to-analog conversion with respect to order wire signals; a branching and combining section to branch and combine analog order wire signals; a 2-wire/4-wire converter which is capable of coupling to a telephone set; and a monitoring processor which includes a storage section to store transmitting and received data, and an order wire monitoring controller, said order wire monitoring controller controlling transmission of test data stored in said storage section to an order wire line, controlling storage of test data received via the order wire line to said storage section, and controlling transmission and reception of one of the received test data, analyzed data of the received test data, and judgment data indicative of a judgment result of a comparison of the analyzed data and threshold values, in response to an instruction from the monitoring control terminal.