Cannot use a managed switch, as I need to perform Layer 3 routing and IP address management.
Here is what I am looking to do.
Airlink offers a CDMA modem with an ethernet interface, but they only have accomodations for one node IP address on the local side.
To have multiple addresses on the local side, you need to use a router in between the CDMA modem and the local LAN.
These devices work well in harsh environments, but I cannot find a decent router that will operate in an outdoor cabinet that has no air-con.
Check out this article from Automation World. I haven't looked in to it too much, but this device can configured to be routable. It may point you in the right direction.
Have you checked out Westermo's range of products? They have a pretty good spec for temperature and supply voltage, and galvanic isolation between ports on many products. Not sure if they have something which meets your exact needs - their technical people are very good and should be able to help.
Is it possible to vent the cabinet, I have even seen large heat sinks mounted on the back with fans moving the air across them or through them. Filter the intake dont move too much air the heat from the equipment inside will keep moisture in check.
