In telecommunications, a channel service unit (CSU) is a line bridging device for use with T-carrier that:
- is used to perform loopback testing,
- may perform bit stuffing,
- may also provide a framing and formatting pattern compatible with the network,
- provides a barrier for electrical interference from either side of the unit, 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).
Read more about Channel Service Unit: Common Varieties, Common Practice
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