indoor apparatus; customer premises equipment
Technical term used in telecommunications and utilities for equipment installed inside a building, such as telephone sets, modems, or indoor units.
The indoor unit for the fiber-optic line broke down, so I had it replaced.
Indoor apparatus includes telephones, routers, and the like.
Refers to outdoor equipment, such as cables or distribution boxes outside the building, contrasting with 宅内装置 which is inside.
customer premises equipment; CPE
Compound of 宅内 (inside the house) and 装置 (apparatus, equipment). A straightforward technical term.