What is port mirroring?

The mirroring feature is ideal for performing diagnostics by allowing traffic that is being sent to and received from one or more source ports to be replicated out a monitoring/target port. 
Port mirroring is available both with managed switches and Ring switches. 
Data is monitoring with a network monitor software. 

Content réference
Ethernet Military Switch RJSMLAC-8UG-CAPS
Ethernet Military Switch RJSMLAC-8MG-CAPS
Ethernet Military Switch RJSML-8US1/8UG1
Ethernet Military Switch RJSML-MG7F3G
Ethernet Military Switch RESMLAC-8US-CAPS
Ethernet Military Switch RESMLAC-8MG-CAPS
Ethernet Military Switch RESMLAC-8MG-CAPS F35
Ethernet Military Switch RESMLAC-28MG
Ethernet Military Switch RES-SCE-AC-8US
Ethernet Military Switch RES-SCE-8MG
Ethernet Military Switch RES-SCE-12MG