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IRC5 Multimove Switch

Hello Friends,

We are trying to create a multimove system with two single IRC5 cabinet. We did and run before like this configuration. There is no problem. 

As you know, there is a switch (3HAC045976-001) near main computer. We couldn't find this switch. Actually it is Jetnet 3005G. It is a gigabit unmanaged ethernet switch. 

I would to ask you, Is there any alternative model to use instead of this switch ? 
If yes, it must be configurable for static IP addresses ? 

What are the IP addresses of ports ? 

Main computer AXC input (Switch port5)
Axis Computer 1 (Switch port1)
Axis Computer 2 (Switch port2)
Axis Computer 3 (Switch port3)
Axis Computer 4 (Switch port4)