What is an SLA in satellite communications?
A Service Level Agreement (SLA) in satellite communications is a contract between a service provider and a customer that formally defines the minimum performance standards the provider commits to maintain. SLAs transform marketing claims into legally binding obligations backed by financial remedies (service credits, early termination rights) if the provider fails to meet the committed parameters.
Key SLA parameters
Availability: Expressed as a percentage of uptime over a measurement period (typically monthly or annual). Consumer satellite internet may offer no formal availability guarantee; enterprise VSAT SLAs typically commit to 99.5–99.9% availability. Mission-critical applications (oil platform operations, financial trading) may require 99.99% ('four nines') availability — equivalent to less than 53 minutes of downtime per year. Latency: Maximum one-way or round-trip delay guarantees. GEO SLAs might commit to <600 ms RTT; LEO enterprise SLAs can commit to <100 ms. Committed Information Rate (CIR): The guaranteed minimum throughput that will always be available regardless of network congestion, as distinct from the Maximum Information Rate (MIR) which is the burst speed available when capacity is free. Packet loss: Maximum allowable packet loss percentage under normal operating conditions.
Enterprise vs. consumer services
Consumer satellite plans (Starlink residential, HughesNet) typically provide best-effort service with published speeds and no formal SLA. Enterprise and government contracts specify CIR, availability, mean time to repair (MTTR), and escalation procedures. The premium for SLA-backed enterprise service is typically 3–5× the cost of consumer-grade equivalent bandwidth — reflecting the investment in redundant infrastructure and operations centre support required to deliver on the commitments.