|No, the frequency response, bandwidth and impedance are different between Data circuits and T1, therefore the 7501-72 card cannot handle a true T1 circuit. A 7501-24 is to be used for a 4-wire data circuit up to 64 kb. Above that, the 751339 HDSL card enters into the fray. If it is a true T1, then the T1 card 751329 should be used. The frequency response, bandwidth and impedance of the cards prohibit building one card that can accommodate a 96 kb circuit all the way up to a 1.544 Mb T1 circuit.