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Please specify your question about 12-port Unchannelized T3/E3 Line Module: supports (12) frame-based fractional T3 interfaces (includes T3 DSU) or (12) E3 frame-based interfaces. Requires either the T312-F0-F3-I/O for unchannelized T3 or the E3-12-F3-I/O for unchannelized E3. Can be used *