Meshdynamics Multi-radio Modular MeshTM
MD4250 Two Radio   MD4350 Three Radio  MD4488 Four Radio Two AP radios MD4454 Four Radio Four DownlinksMD4452 Four Radio Two Downlinks    MD4455 Four Radio with Mobility Scanner

Modular MeshTM Family Is Dynamically Configurable        

Slot 0, &  Slot 1 (blue) links form up + down bridge on 5.8GHz, 4.9GHz, 900 MHz or 2.4Ghz bands.
Slot 2 (pink) is generally used for a 2.4G or 4.9G Client Access Radio (Access Point or Hub) .
Slot 3+ may house another AP radio, another downlink or a dedicated scanning radio (mobile nodes)

MD4250 is used for remote video surveillance and perimeter security.
MD4350 is a popular configuration with one 2.4GHz Access Point radio for client service.
MD4452 and MD4454 support two and four backhaul downlinks respectively.
MD4458 support multiple service radios - it supports 2 or 3 client AP  radios.  
MD4455 MD4355 and MD4325 use a scanning radio in slot 3 for mobile networks. More

Dynamic network policy directives drive the MeshControlTM  running in each node to dynamically change its model number as needed. Thus a 4 radio 4455 will change to two 4250, this providing a thicker pipe.

More: Multiple-Radio-Backhaul-Details and  NMS-Landing-Page and  "The Abstracted Network of Things

OEM Source code licensing                                                     

Meshdynamics has supplied customized versions of our mesh networking software to OEMs that include multiple military contractors, industrial mining solution providers and industrial network router manufacturers. Prior to 2013, the open source based radio and protocol agnostic MeshControlTM  was ported to boards and radios of the customer's choosing. Meshdynamics embedded software integrators provided the customization support.  Post 2013, Meshdynamics also developed a suite of open source software modules to accelerate time to market for OEM developers. Sharp (Japan) for example, manifested their vision of the Smart Network with the mesh node and Sub-1 GHz radios to provide secure low cost and power, purpose built IIoT ecosystems.