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Please specify your question about 1-port OC48/STM16 IOA: provides (1) OC48/STM16 LC full duplex physical port. Works with the ERX-OC48ST16-MOD line module. NOTE: the hardware is capable of supporting APS by using (2) ERX-OC48ST16-IOAs in conjunction with (1) double-wide ERX-OC48ST16-MOD *