When troubleshooting a T1 connection, the support representative from the provider instructs a technician to place a special device into the CSU/DSU. Using this device the provider is able to verify that communications are reaching the CSU/DSU. Which of the following was MOST likely used by the technician?

A. Cable analyzer
B. Toner probe
C. OTDR
D. Loopback plug

Ans: D. Loopback plug

Computer Science & Information Technology

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