| 摘要 |
PURPOSE: To provide a self diagnostic system with improved cost performance capable of easily and surely securing high reliabiility by a single device by realizing self diagnoses including a light emitting element and a light receiving element without connecting a loop cable to the external part of the device by an optical module capable of internal looping including the light emitting element and the light receiving element. CONSTITUTION: This system is constituted of a light emitting circuit 4a for transducing electric transmission signals 2a1 from a transmission circuit 2a to optical transmission signals 9a, a light receiving circuit 4b for transducing optical reception signals 9b to electric reception signals 2b1, a light emitting connection terminal 5a for connecting the optical transmission signals 9a outputted from the light emitting circuit 4a to an optical interface cable 8a and a line board 1 for which the optical module 3 composed of a fiber 6a for loop for passing the optical transmission signals 9a through to the light receiving circuit 4b as well and optical reflection mirrors 7a and 7b is mounted for respective ports. |
