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          Adtran Atlas 550 Quad BRI Module 4 ISDN U Interfaces, 1200315E1, 7553804, Multiplexers
          • ISDN 5ESS, ISDN DMS-100 Modem Protocol
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          Adtran Atlas 550 Quad BRI S T Module, 1200764E1, 7553783, Multiplexers
          • EURO-ISDN, ISDN 5ESS ISDN DMS-100 Modem Protocol
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