| 摘要 |
PROBLEM TO BE SOLVED: To allow equipment to flexibly adapt to a specification change or the like in a degital service unit(DSL) that is place and used on a desk top. SOLUTION: A device main body 41 has an electric circuit part in the inside and has recessed shape unit mount parts 51, 52 at upper and lower faces. Units 42, 43 are constituted to be replacable by inserting an electronic package 71 to the inside of a unit main body 70 and an external optical cable 14 is connected to the units 43, 43, which have an optical cable excess length processing part 100. The units 42, 43 are fitted to the unit mount parts 51, 52 which are replaceable in a plug-in form. |
