Describe a T1 line and briefly describe how it is applied in a T1 connection.
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The term T1 line refers to the specific, shielded, two-pair cabling that connects the two ends of a T1 connection. Two wires are for sending data and two wires are for receiving data. The cable ends with a modular jack, called an RJ-48C that looks a lot like the RJ-45 connector you're used to seeing with Ethernet cables. At either end of a T1 line for termination, you'll find an unassuming box called a channel Service Unit/Digital Service Unit (CSU/DSU). The CSU/DSU has a second connection that goes from the phone company (where the boxes reside) to a customer's equipment (usually a router). A T1 connection is point-to-point-you cannot have more than two CSU/DSUs on a single T1 line.
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