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Please specify your question about DUAL E1 CARD 3 (120 OHM) This is the 120 ohm Dual E1 Card version 3. This card is backwards compatible with 90-0565-08 (Dual E1 2.048 Card)and 90-0568-02 (E1-120 OHM LIM MODULE). This card incorporates the LIMs on board so no external LIM is required. Thi *