| 摘要 |
PROBLEM TO BE SOLVED: To distinguish the inserted plug and its type in a device used for both optical and electrical transmission. SOLUTION: This device used for both optical and electrical transmission allowing selective insertion of an optical fiber plug or an electrical plug comprises a distinguishing terminal 47 or the like in addition to electric connection terminals 24b, 24c, and 24d and an optical semiconductor device 22. It is composed of distinguishing means 41 and 42 distinguishing whether or not the plug is inserted and its type. |
