A Layered, Infrastructure-Independent Communications Capability for National Resilience
Executive Summary
Modern emergency communications systems are highly capable—but also highly interdependent. Land-mobile radio systems rely on towers, microwave backhaul, IP connectivity, and power. Cellular and VoIP systems depend on fiber routes, switching centers, authentication services, and commercial electricity. Even hardened and priority communications services ultimately share common terrestrial dependencies.
Disasters and cyber incidents repeatedly demonstrate that multiple communications layers can fail simultaneously, often for extended periods. When this occurs, agencies lose the ability to coordinate operations, share situational awareness, and maintain command and control across jurisdictions.
True communications resilience is not achieved by hardening a single system. It is achieved through layering diverse technologies with different failure modes, ensuring that the loss of one layer does not result in total communications collapse. Satellite-based systems are a critical component of this strategy because they do not rely on local or regional terrestrial infrastructure.
The Satellite Mutual Aid Radio Talkgroup (SMART) program provides a unique and proven resilience layer by delivering:
- Nationwide, one-to-many push-to-talk voice communications
- Complete independence from terrestrial networks, including cellular, internet, fiber, radio towers, and the public switched telephone network
- Pre-established interoperable talkgroups, eliminating the need for real-time configuration during incidents
- Minimal operational complexity, enabling use by non-technical personnel under stress
SMART functions as a radio system over satellite, not simply a satellite phone service. As part of a layered communications resilience strategy, SMART complements—rather than replaces—land-mobile radio, cellular, HF, and internet-based systems. Its value lies in its ability to remain operational when those systems fail together, significantly reducing single points of failure and strengthening emergency communications readiness Communications Continuity Progr… Communications Resiliency – Sat….
The Problem: Interdependence and Cascading Failure
Emergency communications planning has historically emphasized reliability within individual systems—backup sites, generators, priority access, and redundant paths. While necessary, these measures often overlook a more dangerous risk: shared dependencies.
Power loss, fiber cuts, cyber attacks, software failures, and human error can cascade across:
- Land-mobile radio networks
- Cellular and broadband systems
- Dispatch and call-handling platforms
- Internet-based interoperability gateways
When these failures occur concurrently, agencies frequently discover that their “backup” systems depend on the same infrastructure as their primary systems.
This reality drives the need for infrastructure-independent communications layers—capabilities that remain functional regardless of local or regional network conditions.
Origin and Purpose of SMART
The Satellite Mutual Aid Radio Talkgroup (SMART) program was developed in 2007 through a collaborative effort led by the Department of Justice and the Federal Bureau of Investigation. The objective was to establish a nationwide, interoperable voice capability that could operate when terrestrial communications were unavailable or unreliable.
SMART was designed to:
- Support large-scale and multi-jurisdictional incidents
- Enable cross-discipline coordination
- Provide a common operating voice layer independent of local infrastructure
- Reduce operational complexity during high-stress events
SMART is not an ad-hoc solution—it is a standing, pre-configured capability available immediately when needed Communications Continuity Progr….
What Is SMART?
SMART is a satellite-based push-to-talk (PTT) radio system that functions similarly to a trunked land-mobile radio network, but entirely over satellite.
A talkgroup is a virtual communications channel that allows one-to-many voice communications. Any user transmitting on a talkgroup is heard by all other users monitoring that group, regardless of geographic location, provided satellite visibility exists.
Key characteristics include:
- One-to-many voice communications
- Group-based interoperability
- No reliance on:
- Cellular networks
- Internet or IP backhaul
- Fiber routes
- Radio towers
- Public switched telephone network (PSTN)
SMART bridges the gap between satellite phones (point-to-point) and HF radio (operator-intensive) by delivering radio-style group communications with satellite resilience.
Nationwide and Regional Talkgroups
SMART includes both nationwide discipline-specific talkgroups and regional coordination talkgroups, allowing scalable interoperability.
Nationwide Talkgroups Support:
- Public safety
- Law enforcement
- Fire service
- Emergency medical services (EMS)
- Public health
- Urban search and rescue (USAR)
- Critical infrastructure operators
These talkgroups allow agencies that have never trained together to communicate immediately using a common, predefined channel, without gateways or patches.
Regional Talkgroups Enable:
- Localized mutual aid coordination
- Multi-state incident response
- Regional emergency operations center (EOC) communications
- Area command coordination
Technical Architecture and Non-Reliance on Terrestrial Networks
SMART operates over the MSAT satellite network, using dedicated satellite spectrum and purpose-built terminals.
Each SMART device is assigned:
- A toll-free telephone number
- A ground network (local exchange) number
- A direct satellite-to-satellite number
This architecture allows:
- Normal calling when terrestrial networks are available
- Continued communications when ground routing is degraded
- Satellite-to-satellite communications when all terrestrial networks are unavailable
Satellite-to-satellite communications bypass all ground infrastructure, providing a true last-resort voice path during catastrophic outages Communications Resiliency – Sat….
SMART Compared to a Typical Government HF Station
The table below compares SMART to a typical government HF voice/ALE station deployed for contingency or continuity operations.
| Attribute | SMART (Satellite PTT) | Typical Government HF Station |
|---|---|---|
| Primary Role | Interoperable voice continuity | Long-range contingency communications |
| Communications Mode | Push-to-talk, one-to-many | Voice, ALE, digital |
| Infrastructure Dependence | None (satellite only) | None, but propagation-dependent |
| Operator Skill Required | Low | Moderate to high |
| Training Burden | Minimal | Ongoing training required |
| Setup Complexity | Simple | Moderate to complex |
| Antenna Requirements | Small, fixed satellite antenna | Large HF antenna system |
| Site Footprint | Minimal | Significant (space, grounding) |
| Propagation Management | Not required | Required (frequency/time awareness) |
| Interoperability | Pre-established nationwide & regional talkgroups | Requires coordination and net management |
| Time to Effective Use | Immediate | Dependent on operator proficiency |
| Staffing Requirement | Any trained user | Skilled radio operator |
| Voice Quality | Consistent | Variable |
| Common Failure Mode | Satellite obstruction | Poor propagation / noise |
| Best Use Case | Command, coordination, mutual aid | Backup messaging, long-haul comms |
This comparison highlights a key distinction: HF offers unmatched reach and flexibility, but at the cost of operator skill, antenna infrastructure, and operational complexity. SMART trades some flexibility for speed, simplicity, and predictable performance, making it particularly effective for command-level and mutual aid coordination.
SMART as a Layer in Communications Resilience
SMART is most effective when integrated into a layered communications resilience model:
| Layer | Primary Function | Dependency Profile |
|---|---|---|
| Land-Mobile Radio | Tactical operations | Towers, backhaul, power |
| Cellular / Broadband | Coordination, data | Fiber, switching, power |
| HF Radio | Long-range contingency | Skilled operators |
| SMART | Interoperable voice continuity | Satellite only |
SMART’s role is to:
- Preserve command and coordination
- Enable mutual aid communications
- Reduce single points of failure
- Maintain a survivable voice layer when other systems fail together
Equipment and Installation Overview
SMART terminals are manufactured by Ligado Networks and distributed through authorized vendors.
Typical deployments include:
- Fixed facility or vehicle-mounted installation
- Low-profile satellite antenna
- Indoor terminal unit
- Standard structured cabling to handset or control interface
Installation requirements are generally simpler and more space-efficient than HF installations, particularly in urban or constrained facilities.
Operational Use Cases
SMART is well suited for:
- Emergency operations centers (EOCs)
- Mobile command and control vehicles
- Executive leadership continuity
- Cross-discipline mutual aid coordination
- National-level incident response
Because talkgroups are pre-established, SMART can be used immediately without configuration—an essential advantage during rapidly evolving incidents.
Conclusion
The Satellite Mutual Aid Radio Talkgroup (SMART) program directly addresses the most common failure mode in emergency communications: shared dependence on terrestrial infrastructure.
By providing nationwide, interoperable, one-to-many voice communications that are independent of cellular, internet, fiber, and radio tower systems, SMART serves as a critical resilience layer within a comprehensive communications continuity strategy.
When compared to traditional HF contingency systems, SMART offers lower operational complexity, faster usability, and predictable performance, making it particularly valuable for command-level coordination and mutual aid during large-scale incidents.
For organizations serious about preparedness, continuity of operations, and mission assurance, SMART should be viewed not as an optional enhancement, but as a foundational component of a layered communications resilience architecture.