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Please specify your question about E&M (6) 600C (8-7/1-14)U This card consists of six E<(><<)>(>&<(><<)>)>M interface circuits for 2 or 4-wire transmission. Type IV and V signaling and Mu-Law voice companding are supported. The line impedance is 600+ 2.16uF for 2-wire and 600for 4-wire ope *