Common Varieties
CSUs can be categorized by the class of service they support DS1, 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 NIU (Network Interface Device) 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.
Read more about this topic: Channel Service Unit
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