StreamCaster MIMO Radio User Manual 3/17/15
10017C000 Silvus Technologies Confidential Page
6.2 WAN Backbone with Roaming
The WAN backbone feature allows the wireless mesh network to extend over Internet links.
Multiple geographically separate “sites” can be connected into one single layer 2 network as long
as each site has an uplink to the Internet. The roaming feature allows mobile devices connected
to StreamCaster radios to roam from one site to another without any network re-configuration.
6.2.1 Implementation
Each site wishing to become part of the wireless mesh needs to connect one StreamCaster radio
to its LAN. Such a radio has to be configured to connect to a remote VPN server using the N2N
protocol. Radios from multiple sites will be connected at layer 2 via the N2N VPN server
creating a single broadcast domain for such nodes. By broadcasting routing packets in this
domain, the nodes will auto-detect each other and establish WAN links. Such links will appear
on the StreamScape GUI with a link SNR of 120 dB to differentiate from LAN links (150 dB)
and wireless links.
The N2N VPN server will try to establish peer-to-peer links between the radios if it can. Under
some cases (e.g. symmetric NATs), this is not possible, in which case traffic between the peers is
relayed by the N2N server.
The N2N server can be hosted at any server with a public IP on the Internet. As a proof-of-
concept, a server has been set up on Amazon Web Services. Currently we support up to 10 Mbps
unencrypted between any two sites.
6.2.2 Use Case
Consider a military scenario where a platoon of soldiers begins its mission at an HQ, then breaks
up into two groups. Each group has at least one soldier with an uplink to the Internet (provided
by a 4G card). The HQ also has an uplink to the Internet. Every soldier and the HQ have a
StreamCaster radio attached to their devices.
The soldiers in the two groups want seamless and transparent communication between 1) other
soldiers in the same group 2) soldiers in the other group 3) back to HQ. Some lone soldiers (e.g.
Soldier A with a StreamCaster radio) may break up from each group and move about on their
own. As they get close to group 1, 2 or the HQ, they should be able to immediately establish
communication and talk to all other soldiers in the network.
The StreamCaster radios connected to the uplinks in Group 1-2 and the HQ will automatically
connect and form WAN links.
Note that the WAN and LAN backbone are complementary features. E.g. at the HQ, multiple
radios can be connected to a LAN backbone so that any approaching soldier or group has a direct
line of sight wireless connection to the HQ.
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