You need a T1 CSU/DSU to translate from the T1 to the serial. In T1, you only have 2 pair, 2 wire Tx, 2 wire Rx. In serial, you will have alot more pairs, which means some pairs can be used for control. That's what the DCD, DSR, DTR, RTS, and CTS are. They are individual wires (5 wires) that are either on or off. T1 simply doesn't have the parallel bandwidth for that.
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