Defense Communication Systems: 7 Layers From Radio to C2

A defense communication system is the communications architecture used to exchange voice, video, messages, files, location data, sensor feeds, and command information across military and defense environments. It can connect personnel, command posts, headquarters, vehicles, aircraft, ships, sensors, unmanned systems, and fixed installations.

A modern defense communication system is rarely one product. It normally combines tactical radios, MANET, satellite and terrestrial transport, secure IP networks, encryption, gateways, identity services, video and messaging applications, and command and control software. The architecture must remain usable when bandwidth falls, individual links fail, sites become disconnected, or access to public infrastructure is unavailable.

For system design, the objective is not to compare products by feature count alone. Communication layers should instead be evaluated according to their role, interoperability, security requirements, dependencies, and expected operating conditions.

Communication area	Primary function	Typical technologies
Tactical voice	Connect personnel, units, vehicles, and command elements	HF, VHF, UHF, software defined radio
Tactical data	Exchange positions, messages, telemetry, and operational data	MANET, tactical data links, IP networking
Beyond line of sight connectivity	Connect geographically separated units and facilities	SATCOM, HF, terrestrial backhaul
Video	Support command conferences, remote coordination, and video distribution	Secure video conferencing, RTP, H.264, H.265
Collaboration	Exchange messages, files, voice, video, and shared information	On-premises collaboration servers, secure messaging
Command and control	Deliver operational information to decision makers	C2 and C4ISR applications
Security	Protect identities, data, and infrastructure	Encryption, access control, segmentation, certificates
Resilience	Preserve communications after failures	PACE, redundant transport, MANET, alternative links
Interoperability	Connect different systems and generations of equipment	Gateways, SIP, H.323, RoIP, APIs, federation

What Is a Defense Communication System?

A defense communication system is an integrated set of hardware, software, networks, and security controls designed to provide dependable information exchange for military or defense operations.

Current NATO digital strategy documents describe a similar architectural direction, with emphasis on secure and interoperable digital capabilities, Zero Trust principles, federated environments, edge capabilities, diversified technical solutions, and communication resilience.

How Defense Communications Relate to C2 and C4ISR?

Defense communications provide the information transport and collaboration foundation used by command systems.

Term	Meaning	Relationship to communications
C2	Command and Control	Uses communications to distribute orders and operational information
C3	Command, Control and Communications	Explicitly adds communications to C2
C4	Command, Control, Communications and Computers	Adds computing infrastructure and digital processing
C4ISR	Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance	Combines communications with computing, intelligence, sensors, surveillance, and operational decision support

What a Defense Communication System Looks Like in Practice?

The actual structure depends on the environment.

A headquarters network may not require a tactical MANET. A mobile unit may primarily rely on radio connectivity and local networking. A protected facility may use internal IP networks, conferencing, telephony, directories, and other locally hosted applications without public internet connectivity.

Why Defense Communication Systems Differ From Commercial Communications?

Commercial communications usually operate under relatively predictable network conditions. Users often have continuous access to internet connectivity, cloud services, identity providers, and vendor infrastructure.

Defense environments can impose different constraints.

A site can become isolated. Available bandwidth can change. Communication nodes can move. Different security domains may coexist. Some information may have to remain within organization controlled infrastructure.

These questions can be more important than the total number of application features.

Core Layers of a Defense Communication System

The following model shows where major components sit within the architecture.

Layer	Purpose	Typical components
1. Tactical edge	Connect people, vehicles, sensors, and mobile platforms	Tactical radios, rugged devices, MANET nodes
2. Transport	Carry traffic between users, sites, and networks	SATCOM, HF, fiber, microwave, private LTE, 5G
3. Secure networking	Route and protect traffic	Routers, firewalls, encryption devices, gateways, QoS
4. Communication applications	Support human communication	Messaging, telephony, video conferencing, file sharing
5. Command applications	Organize operational information	C2 platforms, mapping, common operating picture
6. Identity and security	Control access	Directories, certificates, authentication, role controls
7. Management	Configure and monitor the environment	Network management, logging, administration

Defense Communication Systems in 2026: Current Statistics

Military communication infrastructure continues to receive investment in areas such as secure connectivity, SATCOM, battlefield networking, and digital command systems.

According to Fortune Business Insights, the global military communication market was estimated at USD 42.10 billion in 2025 and USD 44.80 billion in 2026. The same forecast estimates a market size of USD 70.20 billion by 2034, corresponding to a projected compound annual growth rate of 5.8 percent.

These figures are market estimates, not measurements of operational effectiveness. They nevertheless illustrate continuing investment in connected platforms, communications infrastructure, secure data exchange, and integration between tactical networks and digital command systems.

Main Defense Communication Technologies and Their Roles

This section focuses on the function of each technology within the wider architecture.

Tactical radio communication

Tactical radios provide voice and data connectivity for personnel, vehicles, aircraft, and command elements.

Modern software defined radios can support multiple waveforms, frequency bands, security functions, and network capabilities. Depending on the implementation, they can also transport position information, video, sensor data, or IP traffic.

Mobile ad hoc networks

A mobile ad hoc network, or MANET, is a network in which participating nodes can establish and reorganize connectivity without relying on a conventional fixed base station.

MANET is relevant where personnel, vehicles, cameras, sensors, or unmanned platforms move and network topology changes.

MANET provides connectivity. Applications such as voice, video, mapping, messaging, or telemetry use that connectivity as a transport layer.

Satellite communications

Satellite communication provides beyond line of sight connectivity between geographically separated users and sites.

It can form part of the transport infrastructure connecting headquarters, remote facilities, vessels, aircraft, and field environments.

SATCOM itself does not provide the complete application, identity, security, and command architecture built on top of the connection.

HF communications

HF radio can provide long range communication without relying on satellite infrastructure.

It can therefore form one part of a diversified communications architecture where more than one transport mechanism is required.

Secure IP networks

IP infrastructure can transport voice, video, messaging, files, sensor information, command applications, and administrative traffic.

This convergence increases the importance of network segmentation, authentication, routing, traffic prioritization, monitoring, gateway security, and application availability.

Secure video conferencing and collaboration

Defense related organizations may also require video meetings, messaging, file exchange, screen sharing, and group communications.

Where external services are unsuitable for the deployment model, collaboration applications can be placed inside organization controlled infrastructure.

The applicability of a particular solution depends on the security requirements, information category, certification requirements, and regulatory environment of the organization operating it.

Command and control systems

C2 systems combine communication with operational information and decision support.

Such platforms can receive information from personnel, vehicles, sensors, maps, communications systems, or external applications and present that information within a common operational environment.

Communications transport information. C2 software processes or presents it for command functions.

Key Requirements for a Defense Communication System

Requirement	Question to ask	Why it matters?
Availability	What happens if the primary path disappears?	One network failure should not automatically remove all communications
Data control	Where are messages, recordings, credentials, and metadata stored?	Information may be subject to specific storage and access requirements
Interoperability	Which networks, endpoints, and protocols can connect?	Existing environments are often heterogeneous
Network independence	Can critical functions operate without external services?	Some systems operate in isolated networks
Bandwidth tolerance	Which features remain usable on constrained links?	Some transport networks provide limited capacity
Latency tolerance	How does the application behave over delayed transport?	Long distance links can introduce latency
Security boundaries	Can users and information domains be separated?	Access requirements can differ between groups
Administration	Can users, devices, and policies be managed centrally?	Complex deployments require controlled administration
Scalability	Can the architecture expand across additional users or sites?	Infrastructure requirements may change over time
Legacy integration	Can existing telephony and video infrastructure remain connected?	Full replacement is not always practical
Update model	Can software be maintained in isolated environments?	Internet based update mechanisms may not always be available
Logging	Can administrators audit access and activity?	Security processes require traceability

PACE and Communication Resilience

PACE stands for Primary, Alternate, Contingency, Emergency.

It is a communications planning concept based on maintaining more than one method of communication for important processes.

At a high level, a system can distinguish between a preferred communication path and independent alternatives that remain available under different network conditions.

Current NATO digital strategy materials also refer to diversified technical solutions and PACE based approaches in the context of mission critical service resilience.

The important principle is dependency diversity.

Several applications that all depend on the same network, identity service, data center, or gateway do not necessarily provide independent resilience.

Defense Communication Security

Security cannot be evaluated solely by checking whether a product uses encryption.

Current defense digital strategies increasingly reference Zero Trust concepts, continuous verification, least privilege, and preparation for post quantum cryptography.

Air Gapped and Disconnected Communications

Some protected networks are designed to operate without direct access to the public internet.

Such an environment can still contain internal servers, directories, conferencing, messaging, telephony, gateways, file repositories, and other applications.

The main architectural issue is dependency management.

A product described as self hosted can still depend on external systems for some functions. These dependencies should therefore be identified before deployment.

Interoperability and Existing Infrastructure

Defense related organizations can operate several generations of communication and information systems simultaneously.

Modernization can therefore require integration between existing and new infrastructure.

Protocol support should not be treated as proof of complete compatibility. Authentication, codecs, security modes, addressing, and optional protocol extensions can differ between implementations.

Testing should therefore be carried out within the actual environment for which a system is intended.

Examples of Defense Communication Technologies and Platforms

The following products illustrate different technology categories. They are included as informational examples rather than as a ranking or procurement recommendation.

L3Harris Falcon IV

Falcon IV is a family of tactical radio products developed by L3Harris.

Public manufacturer materials describe handheld and manpack configurations supporting combinations of tactical voice, data, networking, satellite connectivity, and interoperability functions.

Within a layered communications model, this type of platform belongs primarily to the tactical edge and tactical networking layers.

Motorola Solutions Defense Communications

Motorola Solutions provides radio, interoperability, broadband communication, video, and software technologies used across public safety and government communication environments.

Its portfolio includes P25 based communications and technologies intended to connect radio systems with broadband networks and applications.

Within a defense communications architecture, these technologies can serve radio, installation communication, and interoperability roles.

Rohde & Schwarz SOVERON

SOVERON is a family of software defined radio technologies from Rohde & Schwarz.

The portfolio includes solutions intended for vehicle, portable, airborne, and stationary communication environments. Public product information also describes support for modern and legacy waveform integration.

The technology belongs primarily to the tactical radio and secure communications layers.

General Dynamics Mission Systems

General Dynamics Mission Systems develops communications technologies across areas including radios, tactical networking, satellite related communications, and network security.

Public materials describe systems for vehicle networking, radio communications, secure transport, and integration between different communication environments.

These technologies can occupy tactical edge, transport, gateway, and secure networking roles.

Thales SYNAPS

SYNAPS is a software defined tactical radio family from Thales.

Public materials describe configurations intended for land forces, including mounted communications and protected voice and data exchange.

Within the architecture discussed here, SYNAPS belongs primarily to the tactical radio and networking layers.

Persistent Systems MPU5

MPU5 is a networking and communication platform developed by Persistent Systems around its Wave Relay MANET technology.

Public specifications describe MANET networking together with IP connectivity, voice, video transport, and onboard computing functions.

This places MPU5 primarily within the tactical edge and mobile IP networking layers.

Cisco Webex for Defense

Cisco Webex for Defense represents a hosted collaboration model intended for supported U.S. Department of Defense environments.

Public Cisco documentation describes an Impact Level 5 authorized environment providing collaboration functions such as voice, video, meetings, messaging, and presence.

Its architectural role is different from tactical radio and MANET systems because it operates primarily at the hosted collaboration layer.

Defense Communication Technologies Compared by Role

Example	Primary technology layer	Typical role
L3Harris Falcon IV	Tactical radio and networking	Mobile tactical communications
Motorola Solutions	Radio and interoperability	Installation and multi network communications
Rohde & Schwarz SOVERON	Software defined radio	Tactical voice and data
TrueConf Server	Collaboration	Locally hosted video, messaging, and IP communications
General Dynamics	Tactical networking and secure transport	Mobile and protected communications
Thales SYNAPS	Software defined radio	Mounted and tactical communications
Persistent Systems MPU5	MANET and tactical IP	Mobile networking
Cisco Webex for Defense	Hosted collaboration	Authorized cloud based collaboration

Which Technology Category Addresses Which Requirement?

Requirement	Relevant technology category
Dismounted voice and tactical data	Tactical radio
Communication between moving network nodes	MANET
Beyond line of sight connectivity	Satellite or long range radio transport
Headquarters video and messaging	Collaboration platform
Isolated collaboration environment	Locally hosted applications and identity infrastructure
Existing SIP or H.323 equipment	Compatible communication gateway
Interconnection between heterogeneous networks	Interoperability gateway
Multiple independent communication paths	Resilient multi path architecture
Common operational picture	C2 or C4ISR applications
Hosted enterprise collaboration	Approved hosted collaboration environment

The purpose of this matrix is to separate technology categories according to their role rather than to rank specific products.

Common Evaluation Mistakes

One common mistake is evaluating an application without considering the network conditions in which it will operate.

Another is treating encryption as the complete security architecture. Authentication, administrative access, endpoint protection, software integrity, storage, and network segmentation can also affect system security.

A third mistake is confusing several communication interfaces with independent resilience. Multiple services can still depend on one underlying network or infrastructure component.

Another common issue is underestimating integration with existing systems. Legacy equipment, directories, telephony, video infrastructure, and security controls can significantly affect deployment requirements.

When an On-Premises Communication Platform Is Relevant?

An on-premises collaboration platform can be considered when an organization requires local control of application infrastructure.

On-premises deployment alone does not establish compliance with security or regulatory requirements.

Suitability depends on the information being processed, system classification, applicable legislation, security controls, certification requirements, and the way the solution is configured and operated.

FAQ

What is a defense communication system?

A defense communication system is a combination of hardware, software, networks, and security controls used to exchange voice, video, messages, files, sensor information, and operational data. It can include tactical radios, MANET, SATCOM, secure IP networks, collaboration applications, and command systems.

What is the difference between a defense communication system and C4ISR?

Defense communications provide connectivity and information exchange used by C4ISR. C4ISR is broader because it also includes command, computing, intelligence, surveillance, reconnaissance, and systems that process or present operational information.

What is MANET in defense communications?

MANET stands for Mobile Ad Hoc Network. It allows network nodes to establish connectivity without relying on conventional fixed base station infrastructure, which can be useful in mobile environments.

Can a defense communication system work without internet access?

Some communication technologies and locally deployed applications can operate without public internet access. A fully disconnected environment also requires critical dependencies such as authentication, storage, administration, licensing, and name resolution to be available locally.

What is PACE in military communications?

PACE stands for Primary, Alternate, Contingency, and Emergency. It is a planning concept based on maintaining different communication methods for important processes rather than depending on only one path.

Is encryption enough to secure defense communications?

No. Encryption addresses only part of the security model. Identity management, authentication, access control, key management, endpoint protection, network segmentation, administration, software integrity, and data storage also need to be considered.

What should be evaluated first when selecting a communication architecture?

Start with the environment, users, information types, network conditions, security boundaries, existing infrastructure, availability requirements, and applicable regulatory requirements. Individual products can then be evaluated against those conditions.

About the Author
Diana Shtapova is a product specialist and technology writer with three years of experience in the unified communications industry. At TrueConf, she leverages her deep product expertise to create clear and practical content on video conferencing platforms, collaboration tools, and enterprise communication solutions. With a strong background in product research and user-focused content development, Diana helps professionals and businesses understand core product features, adopt new technologies, and unlock the full potential of modern collaboration software.

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