Channel service unit
From Wikipedia, the free encyclopedia
In telecommunications, a channel service unit (CSU) is a line bridging device that:
- is used to perform loop-back testing,
- may perform bit stuffing,
- may also provide a framing and formatting pattern compatible with the network, and
- is the last signal regeneration point, on the loop side, coming from the central office, before the regenerated signal reaches a multiplexer or data terminal equipment (DTE).
