muLTElink5060
muLTElink is a multiple link airborne radio system that combines a DO-377A Link Executive Manager (LEM) with integrated LTE and C-Band command and control (C2) radios plus support for an external ISM C2 radio.
muLTElink connects to an autopilot via a transparent RS232 serial interface. muLTElink is plug and play with the SkyLink915 ISM Band CNPC radio, and supports SATCOM/ethernet interface radios.
Below you’ll find everything you’ll need to install, maintain, and learn about your muLTElink5060. Fill out a support ticket for advanced problems and questions.
FAQs
Knowledge Base
Can you explain muLTElink LEM Link switching logic?
The ARS (Airborne Radio System) uses muLTElink Link Executive Manager (LEM) to manage which communication path the aircraft uses as its primary receive link.
How it Works
• Primary signal: 1-second rolling average of incoming user data rate to judge link health.
• Evaluation cadence: Runs every 1 second.
• Confirmation cycles: Switch decisions require confirmation across multiple 1-second cycles (~2–3s effective delay).
• Disqualification threshold: About 1.5s for a radio link to be disqualified.
• Hysteresis: Built-in safeguards against flapping; includes “double-hysteresis” in worst-case transitions.
• Active link criteria: A link is considered active if rxBytesPerSec > 0 on the user data channel.
• Prioritization: When the current active link becomes inactive, chooses an active link with the highest rolling average (if multiple).
Decision & Timing Behavior
• Observed switch latency: ~4s max in momentary dropouts.
• Worst-case behavior: Practical timeout guidance of ~10s used by operators, even though disqualification + hysteresis nominally ~2–4s.
Operational Notes
• Failsafe sensitivity: A GCS failsafe set to <5s may trigger before muLTElink can switch; ~10s recommended.
• Manual link disabling: Not supported in SkyLine software; customers disable radios/antennas physically for tests.
See the Skyline ARS User and Installation Guide for more information.