CISCO-OBMI-MIB

The On-Board Management Interface (OBMI) provides an out-of-band communications channel (in Cisco terms: a console port), that is capable of running on various low-speed to high-speed satellite telemetry busses, such as the m500 bus. OBMI is similar to SNMP in principle and function, in that it allows 'getting' data from or 'setting' configurations in a device, however, OBMI is functional regardless of the software state of the device. It must be so, because OBMI is the primary control mechanism for a device operating in the harsh environment of space. OBMI transports command messages that originate from the ground to a device in space and transports telemetry messages that originate from that device in space to the ground. The OBMI application is divided into three conceptual layers: 1. The OBMI application layer which concerns operating system subsystems and their associated command and telemetry messages. 2. A FRAMING layer which formats the OBMI messages into frames that are suitable for transport over a specific spacecraft bus. 3. The PHY (physical) layer which handles sending and receiving the frames over the physical media. Counts associated with the success or failure of these various transport layers are reported by this MIB. GLOSSARY command : data that goes from the ground to the device in space frame : OBMI messages are broken into frames to be sent by the physical bus or reassembled from the bus to be sent to the OBMI subsystem m500 : A particular space command/telemetry bus message : fully assembled set of frames that make up commands or telemetry. The topmost OBMI layer of the OBMI subsystem operates with messages OBMI : On-board Management Interface telemetry : data that goes from the device in space to the ground word : a collection of bits, sized for the particular bus