Loop back system for duplex loop transmission system

Abstract

Abstract PURPOSE:To enable general loop back instruction, by interrupting to the station at the post stage, even at loop back, and giving the function releasing the loop back to the station through the normal reception of the signal in loop back from the station of the post stage. CONSTITUTION:When general loop back instruction is received from a transmission line 3 via a receiver 21a, a decoder 27c interprete it, and a switching control circuit 27a gives a switching signal 32a to switching circuits 26c and 26d so that a transmission/reception control circuit 24 is inserted between the output of the receiver 21a and the input of transmission 22a, 22b. Thus, the general loop back instruction is in loop back through the transmitter 22b of a station 2a and transmitted to the station at the post stage with the transmitter 22a.

Inventors

• 👤 Masahiro Matsumoto
• 👤 Shogo Nasu

Bibliographic Details