Data and Control Interfaces

This section provides a brief overview of the Satlab SRX-8 data- and control interfaces.

../_images/datainterfaces.drawio.svg

The SRX-8 is controlled via CubeSat Space Protocol (CSP) messages over CAN, UART or gigabit Ethernet. This includes configuration of the system as well as reading of telemetry and status.

There are two ways to submit downlink data to the SRX-8:

  • For ease of use, use the SRX-8 as an IP router, forwarding traffic received on the two Ethernet interfaces using IP Forwarding.

  • For maximum throughput and control, build and submit BBFRAMEs to an instance of the BBFRAME Data Service data service that is reachable on each of the data endpoints.

The SRX-8 replies to ARP (e.g. arping) on the two data endpoints (default 192.168.100.101 and 192.168.101.101).

The example below shows how to verify connection to the 1 Gb/s data endpoint. Note that a valid IP route must be set up on the host PC prior to the test and the sys.net.en.enable property must be set to true to enable the 1 Gb/s Ethernet interface. Updating this property requires a store followed by a system reset. See Properties for more information.

satlab@satlab:~$ sudo arping 192.168.100.101 -c 3
ARPING 192.168.100.101 from 192.168.100.170 <1Gb/s_interface>
Unicast reply from 192.168.100.101 [48:E6:C6:20:01:02]  1.013ms
Unicast reply from 192.168.100.101 [48:E6:C6:20:01:02]  1.133ms
Unicast reply from 192.168.100.101 [48:E6:C6:20:01:02]  1.065ms
Sent 3 probes (1 broadcast(s))
Received 3 response(s)

The example shown above can also be used to verify the 10 Gb/s Ethernet interface, except that the default IP range is different and that sys.net.xg props should be used instead.