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Please specify your question about STRATUM 3 SSU 2/R3.1 clei The Stratum 3 SSU-2 Module provides Stratum 3 timing synchroniz ation to an incoming timing signal for the 7470 system. The Stra tum 3 SSU-2 Module is an optional module for the Control Card 2 (90-3346-01) INTEG CALLP/PNNI CARD-2 *