Control Network Segregation from other type of networks
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To bring two different physical networks to another location over radio, two radio modems is needed on each location.
In my world, a large portion of the safety and robustness added with configuring a secondary network is lost if the secondary network is coupled with the primary, e.g. over a single channel radio.
The two networks shall preferably not share any common hardware at all, i.e. be totally isolated from each other. E.g. not be sent as two different VLANs over the same wire or radio frequency.
As I mentioned to your prevous question, mixing MB300 with other internet equipement is troublesome because MB300 is not proper TCP/IP and some equipment will reject the messages. The same applies in reverse. Feeding VoIP, internet and mail messages into your AC450 network interface is a really bad idea.
Dont mix MB300 ( or MB300e ) with other networks. The collision detection used by MB300 could become very upset by all that traffic.