Adtran expands Oscilloquartz atomic clock portfolio with lower-cost optical cesium solutions for wider market adoption

HUNTSVILLE, Ala.--(BUSINESS WIRE)--Jun 2, 2025--

Adtran today launched the latest additions to its Oscilloquartz optical cesium portfolio, expanding access to precision timing across a wider range of network environments. The new OSA 3200 SP and OSA 3250 ePRC leverage advanced optical pumping technology, offering improved holdover, simplified maintenance and a typical lifetime of 10 years. Built on the same proven platform as Adtran’s high-end cesium models, the solutions enable telecom operators, data centers, power utilities and defense networks to modernize synchronization infrastructure while lowering operational complexity and cost. The new models also address industry demand for alternatives to legacy magnetic cesium clocks that are more difficult to manage over time.

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“We developed the OSA 3200 SP and OSA 3250 ePRC to make our industry-leading optical pumping cesium technology more accessible,” said Gil Biran, GM of Oscilloquartz, Adtran. “As the only vendor in the industry offering optical pumping cesium solutions, we’re uniquely positioned to support customers facing supply chain risk and escalating performance demands. By leveraging our existing high-end platform, we've engineered lower-cost solutions that enable more operators to benefit from the accuracy, longevity and modern manageability needed to keep critical timing infrastructure resilient and secure – whether at the network core, in distributed data centers or across mission-critical environments.”

The OSA 3200 SP addresses the need for a cost-optimized PRC-class cesium clock with standard performance, while the OSA 3250 ePRC is tailored for PNT applications that demand enhanced holdover capabilities. The OSA 3200 SP is a standard-performance cesium clock, part of a widely recognized industry classification that includes standard performance (SP), high performance (HP) and super high performance (SHP) levels.

The OSA 3200 SP and OSA 3250 ePRC share more than 95% of their electronics with Adtran’s flagship OSA 3300 and 3350 models, minimizing operational risk, streamlining inventory and ensuring deployment compatibility. Both solutions offer a 10-year service life – two years longer than typical magnetic ePRC clocks – and feature a design that places laser components outside the vacuum chamber. A compact physics package, enabled by unique patented technology, simplifies servicing and lowers system cost. Integrated support for SNMPv3, SSH and syslog is built in via a native TCP/IP stack, while compatibility with Adtran’s Mosaic Sync Director enables centralized visibility and control. With multiple timing outputs and secure remote management, these clocks are ready for rapid, scalable deployment.

“Our new solutions offer a more cost-effective route to scalable, sustainable timing,” commented Patrick Berthoud, time and frequency chief scientist at Oscilloquartz, Adtran. “We’re extending the reach of our unique optical pumping cesium innovation to customers who need standard performance and high reliability at a much lower cost. As legacy magnetic clocks become harder to support, the OSA 3200 SP and 3250 ePRC provide a reliable, long-term foundation based on much more advanced technology – easier to manage, easier to service and fully integrated into the modern synchronization ecosystem. Whether for telecom operators, power utilities, transportation, hyperscalers or other markets, these new solutions bring optical cesium technology to entirely new applications.”

Further information on the OSA 3200 SP and OSA 3250 ePRC is available in these slides.

Adtran’s Oscilloquartz OSA 3250 ePRC will be on display from June 3 to 4 at the Joint Navigation Conference 2025 in Cincinnati, Ohio, USA.

About Adtran

ADTRAN Holdings, Inc. (NASDAQ: ADTN and FSE: QH9) is the parent company of Adtran, Inc., a leading global provider of open, disaggregated networking and communications solutions that enable voice, data, video and internet communications across any network infrastructure. From the cloud edge to the subscriber edge, Adtran empowers communications service providers around the world to manage and scale services that connect people, places and things. Adtran solutions are used by service providers, private enterprises, government organizations and millions of individual users worldwide. ADTRAN Holdings, Inc. is also the majority shareholder of Adtran Networks SE, formerly ADVA Optical Networking SE. Find more at Adtran, LinkedIn and X.

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Adtran’s OSA 3200 SP and OSA 3250 ePRC will bring lower-cost optical pumping cesium technology to new markets and applications.

CRANS-MONTANA, Switzerland (AP) — In the aftermath of a fire inside a Swiss Alpine bar that killed 40 people celebrating the new year, survivors, friends and family members, the region’s top authorities and even Pope Leo have spoken to the public in remarks in French, Italian, German and English, reflecting the tradition of Swiss multilingualism.

Another 119 people were injured in the blaze early Thursday as it ripped through the busy Le Constellation bar at the ski resort of Crans-Montana, authorities said. It was one of the deadliest tragedies in Switzerland’s history.

Investigators said Friday that they believe sparkling candles atop Champagne bottles ignited the fatal fire when they came too close to the ceiling of the crowded bar.

Here’s a look at what people said in the wake of the disaster:

— “I’m looking everywhere. The body of my son is somewhere,” Laetitia Brodard told reporters Friday in Crans-Montana as she searched for her son, 16-year-old Arthur. “I want to know, where is my child, and be by his side. Wherever that may be, be it in the intensive care unit or the morgue.”

— “We were bringing people out, people were collapsing. We were doing everything we could to save them, we helped as many as we could. We saw people screaming, running,” Marc-Antoine Chavanon, 14, told The Associated Press in Crans-Montana on Friday, recounting how he rushed to the bar to help the injured. “There was one of our friends: She was struggling to get out, she was all burned. You can’t imagine the pain I saw.”

— “It was hard to live through for everyone. Also probably because everyone was asking themselves, ‘Was my child, my cousin, someone from the region at this party?’” Eric Bonvin, general director of the regional hospital in Sion that took in dozens of injured people, told AP on Friday. “This place was very well known as somewhere to celebrate the new year,” Bonvin said. “Also, seeing young people arrive — that’s always traumatic.”

— “I have seen horror, and I don’t know what else would be worse than this,” Gianni Campolo, a Swiss 19-year-old who was in Crans-Montana on vacation and rushed to the bar to help first responders, told France's TF1 television.

—“You will understand that the priority today is truly placed on identification, in order to allow the families to begin their mourning,” Beatrice Pilloud, the Valais region's attorney general, told reporters Friday during a news conference in Sion.

Pope Leo said in a telegram Friday to the bishop of Sion that he " wishes to express his compassion and concern to the relatives of the victims. He prays that the Lord will welcome the deceased into His abode of peace and light, and will sustain the courage of those who suffer in their hearts or in their bodies.”

— “We have numerous accounts of heroic actions, one could say of very strong solidarity in the moment,” Cantonal head of government Mathias Reynard told RTS radio Friday. "In the first minutes it was citizens — and in large part young people — who saved lives with their courage.”

— “Switzerland is a strong country not because it is sheltered from drama, but because it knows how to face them with courage and a spirit of mutual help," Swiss President Guy Parmelin, speaking on his first day in the position that changes hands annually, told reporters Thursday.

People bring flowers near the sealed off Le Constellation bar in Crans-Montana, Swiss Alps, Switzerland, Friday, Jan. 2, 2026, where a devastating fire left dead and injured during the New Year's celebrations. (AP Photo/ Antonio Calanni)

A woman holding a stuffed animal, whose daughter is missing, gather with others near the sealed-off Le Constellation bar in Crans-Montana, Switzerland, Friday, Jan. 2, 2026, where a devastating fire left dead and injured during the New Year's celebrations. (AP Photo/Baz Ratner)

People light candles near the sealed off Le Constellation bar in Crans-Montana, Swiss Alps, Switzerland, Friday, Jan. 2, 2026, where a devastating fire left dead and injured during the New Year's celebrations. (AP Photo/ Antonio Calanni)