Lantronix SI-IES-511D-LRT is an unmanaged hardened PoE++ injector/converter in the SI-IES-5x1D-LRT Series. This configuration includes (1) 1G/10GBase-X SFP+ slot and (1) 10M/100M/1G/2.5GBase-T(X) PoE++ Port. The SKU is the one-copper-port model listed alongside SI-IES-521D-LRT, which has two 10M/100M/1G/2.5GBase-T(X) PoE++ Ports. Both listed sibling configurations include one 1G/10GBase-X SFP+ slot. Use SI-IES-511D-LRT when the required configuration is a single PoE++ multi-rate Base-T(X) port paired with a 1G/10GBase-X SFP+ slot in an unmanaged hardened injector/converter.