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Channel service unit
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== Common practice == CSUs are required by [[PSTN]] providers at digital interfaces that terminate in a [[Data service unit|DSU]] on the customer side. They are not used when the service terminates in a modem, such as the [[Digital subscriber line|DSL]] family of service. The maintenance capabilities of the CSU provide important guidance as to whether the provider needs to dispatch a repairman to the customer location.
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