MeshDynamics Modular Mesh Configuration Options
  MeshDynamics' MD4000 Modular MeshTM houses 4 high power (400 mw) Wi-Fi radios in one enclosure. Slots 0, 1 are as uplink and downlink for our Structured MeshTM backhaul. 

All MD4000 nodes, when wired to an Ethernet switch, automatically self configure to become root nodes. Other (wire-less) nodes then connect to them and a tree-like topology is formed.  

The secure backhaul frequency band is typically 5.8GHz or 4.9GHz. 2.4GHz may also be used.  

Slots 0,1 provide the tree-like meshed backhaul. The remaining 2 slots are configured to support these application categories:
1. Static Mesh Nodes: For stationary or slowly changing RF environments [More]
2. Mobile Mesh Nodes: Intended for dynamic RF environments and/or mobile vehicles. [More]   
3. Single Radio Edge Nodes. (Software) For OEM CPE devices or mobile man wearable units (e.g. for Military, Public Safety)
4. Custom: Contact us to discuss your custom configuration and application. See: MeshDynamics Model Numbering Scheme
1. Static Mesh Nodes

Static Mesh Nodes do NOT have a mobility scanner. They are not intended for mobile scenarios. Standard models are:
MD4250 Two RadioMD4350 Three RadioMD4452 Four Radio Two DownlinksMD4454 Four Radio Four DownlinksMD4488 Four Radio Two AP radios2.4GHz Equivalent of MD42502.4GHz version of MD4454-AAAA
Click on an image to access application notes on that configuration. Note: 2.4Ghz, 4.9Ghz backhauls also supported

A. MD4250-AAxx is the bare bones 2-radio model Structured Mesh 5GHz backhaul. The backhaul capacity is 22 Mbps TCP/IP or 44 Mbps TCP/IP in Turbo Mode (54 Mbps Raw, 108 Mbps Turbo).
It is used where no client access is required. e.g. Video surveillance, cameras plug into the Ethernet Port as shown here
The 4250 is also used to connect two remote sub trees, as shown here.
B. The MD4350-AAIx is a 3-radio model 5GHz backhaul, with a 2.4GHz (802.11b/g) AP in slot 3 for client access. It is our most  popular static node configuration. Note that there is only one AP radio, if more power or focused beams are need, consider the 4458 
C. When more backhaul capacity is needed: MD4452-AAIA is a 4-radio model with 2 downlinks. it provides twice the downlink capacity: 44 Mbps TCP/IP or 88 Mbps Turbo TCP/IP (108 Mbps raw, 216 Mbps Turbo). Intended to backhaul traffic from two forks of the tree,  may be used either a root or a relay (it has an uplink). It is therefore fault tolerant: if the Ethernet connection fails it will become a relay and connect to another sub tree in the network. The MD4454-AAAA provides up to 88 Mbps/176 Mbps Turbo TCP/IP but all four radios are downlinks. Since it has no uplink it is always used as a high capacity root supporting up to four forks and their sub trees.
D. When more client Access Points are needed: MD4350, MD4452, MD4454 all have one 2.4GHz client radio and hence one antenna, generally omni-directional. To provide more focused beams, MD4458-AAII  and  MD4458-AIII have two and three client radios. Using sectored antennas more focused power can reach occluded areas. Multiple AP radios are also needed to point the RF bean in different directions or inclinations: Example: The MD4458-AAII is used in underground mining- the inclined tunnel shaft requires two service radios each connected to 180 degree inclined panel antennas facing opposite directions of the mine shaft. Other products with a single AP proved inadequate - their single radio antenna could not be inclined in two directions. 
E. 2.4GHz Stationary Nodes Options: 2.4GHz radios have almost twice the range as 5.8GHz radios but the 2.4GHz RF space is generally congested and no-interfering channels is limited to three. 2.4GHz backhauls are best used to as edge nodes. [More]. Two all-2.4GHz nodes are shown above. The MD4424-IIII is a 2.4GHz variant of MD4454. It has 4X the radio energy of a single 2.4 AP and is intended for directed beams at hot spots. All four downlinks may also feed mesh chains using the MD4220-IIxx. The MD4220-IIxx is a 2.4GHz variant of MD4250. Since the downlink is a 2.4 radio, provides client access and mesh backhaul services. 

F. Bridging between 5.8GHz and 2.4GHz Meshed Backhauls is supported, as shown here.  Beyond using 2.4GHz nodes at the edges of the network, 2.4GHz backhauls should be avoided: there are only three non interfering channels and sharing Backhaul and Client RF space undermines the effectiveness of Dynamic Channel Management [More]
G. Additional Information: regarding 4.9GHz, GPS, FIPS 140/2, P3MTM Persistent Mesh is located here
2. Mobile Node Options.

Intended for dynamic RF environments, mobility nodes use a dedicated mobility scanner radio to monitor the RF environment and adapt to a dynamic network topology. Think of the 5 in MD4455 and MD4325 as an "S", for scanner.

  MD4355 Mobile Mesh Node MD4455 Mobile Mesh Node MD4325 Mobile Mesh Node Ubiquiti Bullet, Mesh Enabled

Click on an image above to access application notes on that configuration. Note: 4.9Ghz backhauls also supported

MD4355 and MD4455 are "mobile" versions of the MD4250 and MD4350 The scanning radio in slot 3 "listens" to the RF environment and helps the node make judicious parent node selections in a high speed mobility environment. The MD4325 is a 2.4GHz scanner equipped version of the MD4220. It will interoperate with the 4455: its 2.4GHz uplink will connect to the most suitable 4455 using the 2.4GHz Client Access Point on the 4455 as a  parent's downlink [Illustration]

A. P3M Persistent Mesh: A cluster of mobile nodes will automatically form a network with each other. If the cluster physically separates into two smaller clusters, each will then become its own independent network.  If two separate clusters/networks physically come together, one single network will form and all nodes + associated clients will then be able to share data. In a deployed combat environment in Iraq, MD4325 and MD4455 and vehicle-mounted nodes demonstrated reliable connectivity between convoy vehicles in simultaneous motion. Networks split and reformed dynamically and in real time. Applications supported by MeshDynamics systems operated flawlessly as vehicles moved through rugged terrain.[P3M Press Release],  [Military Solutions Web Page
B. Additional Information: regarding 4.9GHz, GPS, FIPS 104/2, P3MTM Persistent Mesh is located here

List for Standard Configurations
List of Standard Configurations, 5.8GHz backhauls 
1. 4250-AAxx: 2 radios, 11a uplink, downlink, slots 0,1. Intended as static backhaul, no AP for clients. Example   
2. 4350-AAIx: 3 radios, 11a uplink, downlink, slots 0,1. Both 11b and 11g service available on slot 2 Slot 3 empty..   
3. 4452-AAIA: 4 radios, 11a uplink, downlink, slots 0,1. Both 11b and 11g service available on slot 2. Second downlink in 3.
4. 4454-AAAA: 4 radios, All 11a downlinks, slots 0,1,2,3. Intended as a root node, with four sectored antennas. .  
5. 4458-AAII: 4 radios, 11a uplink, downlink, slots 0,1. Both 11b and 11g service available on sectored antennas, slots 2, 3
6. 4458-AIII: 4 radios, 11a uplink in slot 0, no downlink. Slots 1,2,3 are sectored service 11b+11g radios for client access.   
7. 4455-AAIA: 4 radios, 11a uplink, downlink, slots 0,1. Both 11b and 11g service in slot 2. 11a scanning radio in slot 3.  
8. 4355-AAxA: 3 radios, 11a uplink, downlink, slots 0,1, No client AP, wireless backhaul only. 11a scanning radio in slot 3. 
9. 4000-FIPS: 4-radio modules, radio functions configured per military customer requirements. Support: 5.8GHz, 4.Ghz, 2.4GHz.

List of Standard Configurations, 2.4GHz Backhauls 
1. 4220-IIxx: 2 radios, 11b+11g uplink, downlink, slots 0,1. Used as 11b+11g long range backhaul, sectored links, rural areas. 
2. 4424-IIII: 4 radios, ALL downlinks, slots 0,1,2,3. Supports 11b and 11g. Intended as root, with four sectored services.   
3. 4325-IIxI: 3 radios, 11b uplink, downlink, slots 0,1. 11b scanning radio in slot 3. Longer range edge mobility node
1. All models use 400 mw 802.11a/b/g Mini-PCI AtherosTM based field replaceable radio cards. See: Cover Removed 
2. All models support three backhaul frequencies: 5GHz,(e.g MD4250),  4.9GHz (e.g. MD4240) and 2.4GHz (e.g. 4220).
3. All models are remotely configurable. Models may be field upgraded through the NMS and inserting additional radio cards
4. All models support an internal GPS Radio. Must be factory installed, requires modifications to enclosure.
5. All models may be ordered in an Intrinsic Safe enclosure powered by 3.3VDC. Must be factory installed.
6. All models may be ordered to be FIPS 140/2 compliant. Must be factory installed, requires modifications to enclosure.
7. All models support P3MTM Persistent Mesh. The Factory default setting is P3M disabled. User enables through the NMS.