Patent ID: 8396365

Claim:
A customer premises optical network unit connected with a center-side optical line termination through optical transmission paths and with an external node through a MSA (Multi-source Agreement) interface to perform termination processes, comprising: an electrical/optical converting section connected with said center-side optical line termination to perform optical/electrical conversion and electrical/optical conversion of signals; an optical network unit functioning section connected with said electrical/optical converting section to terminate said signals; a serial/parallel converting section connected with said optical network unit functioning section to perform serial/parallel conversion and parallel/serial conversion of said signals; a MSA interface module having a main I/F (interface) section connected with said serial/parallel converting section to input/output said signals to/from said external node and a sub-I/F section for inputting/outputting serial signals; a first management processing section connected with said optical network unit functioning section through a serial signal line or parallel signal line to receive part of said terminated signals and to convert the part of said terminated signals into a first serial signal; a monitoring signal transmission path for transmitting said first serial signal from said first management processing section to said sub-I/F section; a second management processing section connected with said electrical/optical converting section to receive predetermined physical data and to output the predetermined physical data by converting into a second serial signal; and another monitoring signal transmission path for connecting said second management processing section with said sub-I/F section; wherein said monitoring signal transmission path is connected with said sub-I/F section through said other monitoring signal transmission path.