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Please specify your question about 4 port OC3/STM1 or OC12/STM4, per port rate-selectable PIC. Ports 0-3 can be mixed with OC3/STM1 and OC12/STM4. Port-0 can be configured to OC48 which disables ports 1-3. Requires OC3 or OC12 or OC48 SFP pluggable optics. See Interface Accessories section *