IN Brief:
- VIAVI has added TETRA MS base-station simulation to its CX300 communications service monitor.
- The software-keyed option allows radio testing without placing devices in T1 test mode.
- Mission-critical communications testing is becoming more important as public-safety, transport, utility, and defence networks modernise.
VIAVI Solutions has added a TETRA mobile-station base-station simulator option to its CX300 communications service monitor, expanding field and laboratory test capability for mission-critical radio systems.
The software-keyed option allows full TETRA radio testing without placing devices into T1 test mode, avoiding an additional configuration step during maintenance and validation. The CX300 already supports land mobile and professional mobile radio protocols including TETRA, P25, DMR, and NXDN, with the new feature extending its use in public safety, government, transport, utility, and industrial communications environments.
The platform combines spectrum analysis, signal generation and analysis, cable and antenna analysis, power measurement, audio analysis, and automated alignment functions. With the TETRA MS base-station simulator option, engineers can run call processing and receiver tests, including BER and MER loopback, alongside transmitter measurements covering RF power, burst timing, carrier frequency offset, modulation accuracy, and power profile.
TETRA remains embedded across critical communications networks in Europe and other regions because it offers controlled, resilient voice and narrowband data services separate from commercial cellular infrastructure. Broadband public-safety systems and private 5G networks are developing quickly, yet established professional radio networks continue to carry operational traffic where coverage, priority access, and service continuity are non-negotiable.
That mixed communications environment creates a more demanding test landscape. Critical infrastructure sites may combine TETRA, private LTE, 5G, fibre, microwave, and satellite links, each serving different operational roles. Recent 5G critical-site connectivity work involving Lantronix shows how cellular systems are becoming part of infrastructure communications, while mature radio standards remain in service for voice resilience and field operations.
Field teams need instruments that can validate radios, antennas, cabling, modulation quality, and fault conditions without excessive setup time. In mission-critical systems, uncertainty during testing can delay maintenance or leave operators without a clear view of equipment readiness. A portable service monitor with protocol-specific simulation reduces that friction by bringing more of the test environment into a single instrument.
VIAVI has also designed the CX300 option to support users migrating from the 3920B platform, preserving familiar TETRA workflows while adding broader measurement functions. That continuity is important in sectors where equipment replacement cycles are long and radio fleets may include multiple generations of handsets, base-station equipment, and support tools.
The defence and security environment is increasing attention on radio resilience and spectrum assurance. UK electronic warfare activity around CRENIC testing reflects a wider need to understand how communications systems behave under interference, congestion, and operational stress. TETRA service testing sits in a different part of the market, but the underlying requirement is consistent: radio networks must be measured under conditions that resemble real use, not only ideal laboratory states.
Long-lived standards also create design and maintenance challenges. New broadband systems may support video, data, and situational awareness, yet voice services and field communications often remain anchored in proven professional radio technologies. Test platforms therefore need to support both current network evolution and the installed base that public-safety and industrial organisations cannot replace quickly.
The CX300 update gives VIAVI a stronger position in that practical maintenance layer. By adding base-station simulation through software rather than hardware expansion, the company is extending the usable scope of the instrument while keeping deployment manageable for teams supporting critical radio networks in the field.
