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Short for Channel Service Unit/Data
Service Unit. The CSU is a device that connects a terminal to a digital line.
The DSU performs protective and diagnostic functions for a telecommunications
line. Typically, the two devices are packaged as a single unit. Such
a device is required for both ends of a T-1 or T-3 connection, and the units at
both ends must be set to the same communications standard.
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| Metroline
Inc. is an independent distributor of technology and telecommunications
equipment. Metroline
Inc. does not represent Avaya Communication, Lucent Technologies, Nortel
Networks, Cisco, Toshiba, Mitel, NEC, Dell, ShoreTel or their affiliates in any way. Merlin, Merlin Legend, Merlin Magix, Partner, Partner Plus, Partner II, Partner ACS, Spirit, Definity, IP Office, and Avaya Communication Manager are registered trademarks of Avaya
Communication. Norstar, Meridian, and Business Communication Manager are registered trademarks of Nortel
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