OUTPUT LEVEL ADJUSTING SYSTEM

摘要

PURPOSE:To increase sufficiently a network termination and a terminal device by adjusting an output level from each terminal device so as to be a prescribed amplitude at a network termination reception point. CONSTITUTION:''0'' is inserted to a monitor pattern inserting position MT of Fig. (B) at first in a terminal device desired to be adjusted and the result is transmitted to an outgoing line T. The network terminal 1 receives it and reflects it as an MR to an outgoing line R. Then an output level adjusting device 8 of the terminal device increases the level by a minute level DELTAV and transmits the result to the line T. The network termination reflects it similarly as above. The operation like this is repeated and the output level incremented numbr of times is checked until the MR on the line R at the terminal device reaches ''1'' at first. Suppose that this is K-time, then the said incremental number of times as the output level of the final ''1'' code becomes an amplitude equivalent to 2K-times. The ''1'' code output level is adjusted so as to be received as the amplitude double the threshold value of the receiver of the network terminal from the terminal device independently of the range from the network termination of the terminal device.