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M23 - Telecommunications
Multiplex 2-to-3. A DS-3 (T-3) signal format that combines seven DS-2s (T-2s) to from a DS-3 (T-3). M23 multiplexor (MUX) combines 7 T-2s into a T-3 at a total signaling rate of 44.736 Mbps, adding more signaling and control bits than the previous technologies of M24 and M12.