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Channel service unit
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== Common varieties == CSUs can be categorized by the class of service they support ([[Digital Signal 1|DS1]], [[Digital Signal 3|DS3]], DDS, etc.) and by the capabilities within that class. For example, basic DS1 (T1) CSUs support loopback of each interface and will produce [[alarm indication signal]] to the provider's [[network interface device]] (NID) in the event of loss of signal from the [[customer-premises equipment]] (CPE). More advanced units will include internal monitors of the performance of the carrier in both directions and may have test pattern generation and monitor capabilities.
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