L3-CDH-BUS-ENET
ESSENTIAL
COMMAND CONTROL
Level 3 · hardware
TTEthernet Network
Time-Triggered Ethernet for High-Bandwidth Data
TTEthernet providing high-bandwidth fault-tolerant networking for bulk data transfer
Purpose
TTEthernet providing high-bandwidth fault-tolerant networking for bulk data transfer
Context
Child of L2-CDH-BUS
Principles
- ▸Time-triggered traffic provides deterministic delivery for control messages
- ▸Rate-constrained traffic provides bounded latency for sensor data streams
- ▸Best-effort traffic handles bulk data transfers using remaining bandwidth
- ▸AS6802 standard ensures interoperability and formal verification support
Typical implementations
- ▸NASA Orion MPCV TTEthernet avionics network
- ▸TTTech Nerve aerospace TTEthernet switches
- ▸Airbus A380 AFDX (precursor deterministic Ethernet)
Lunar considerations
- ▸Higher bandwidth than SpaceWire enables science data and video streaming
- ▸Radiation-hardened Ethernet switches required for 100-year operation
- ▸Network redundancy (dual-redundant switches) prevents single-point failure
Specifications
Functional
| primary function | TTEthernet providing high-bandwidth fault-tolerant networking for bulk data transfer |
Physical
| materials | Rad-hard Ethernet PHY ICs, Cat6A shielded cable, Rad-hard Ethernet switches |
Interfaces
Provides
- High-bandwidth data network for bulk transfers
Requires
- Power for Ethernet switches (~10W per switch)
Cite this entry
Lunar Ark Codex. "TTEthernet Network" (L3-CDH-BUS-ENET). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-CDH-BUS-ENET
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.