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Please specify your question about QUAD OC3/STM1 IR UNI/NNI clei The quad OC3/STM1 IR UNI/NNI Card is a ATM interface card operating at the SONET OC3 rate of 155 Mbps per port. The Intermediate Reach (IR) single mode fiber optical interface has a total loss budget of 12db. The quad OC3 car *