The TSC2-12 is a 2 port EMI digital direction coupler. Digital-Ready Broadband 5' 1000MHz frequency range. Its Standard TSC series feature epoxy-sealed back cover plates for effective EMI-RFI shielding. > -90dB to reduce signal ingress. The TSC-SB series features a solder-sealed back cover-plate to provide maximum EMI-RFI shielding. > -130dB, eliminating signal ingress and guarantee distortion free pictures