====== Network topology of Bolidozor ======

Detection network Bolidozor uses stations’ internet connection as its main infrastructure. Observatories also use their internal ethernet network for direct preview of measured data (e.g. in a lecture room). 

====== Station’s data flows ======

A typical [[en:rmds|radio detection stations]] connected in Bolidozor network has roughly the following construction:

{{:cs:rmds:rmds_supervising_system.png?600|Connection of one of the Bolidozor stations}}

As you can see, the station is connected to network via several routs that differ in a direction of data transfer, data flow and an expected probability of failure. 

===== VPN connection =====

Virtual private network connecting the stations via Internet is important for keeping the supervision and enabling a remote maintenance. VPN leads to one of our [[en:servers|servers]], which at the same time evaluates state of the individual stations. 

Other use of VPS is in an internal communication between stations. This is important for some [[en:algorithms|algorithms]] involved in detecting the coincidence. 

**VPN is not intended for massive data transfers that can be done via a direct connection to data server (especially upload of primary recorded data from stations)**

A reason for restricting the data flow over VPN is to decrease the demands for data throughput of VPN server connection. 

===== SCP connection to data server =====

SCP carried out by [[en:data-uploader|data-uploader]] is intended for transfer of primary data to [[en:servers|data server]]. In this way, measured data are uploaded. This connection requires data flows of approximately 1GB/day in the direction from station.

===== Local ethernet connection =====

Local ethernet network is used by observatories to present the data obtained by the station. For example, a lecture room can be used to present an actual data stream from station together with a running waterfall and a generated sound. Data flow in this connection depends on the way and resolution of the signal sampling on the station. However, it moves in order of units of MB/s. It is necessary to have a local network in a good shape to prevent failures. 

===== Backup connection via GSM =====

This way of station’s supervision will be used in future as a backup solution - e.g. in order to reset the station or perform a remote diagnostics in case of failure.