Union Minister for Consumer Affairs, Food and Public Distribution and New and Renewable Energy Pralhad Joshi commissioned the White Rabbit Technology-based Indian Standard Time (IST) Dissemination Demonstration Network at the Regional Reference Standard Laboratory (RRSL) in Bengaluru on 16 July 2026. The network is designed to securely distribute IST with sub-nanosecond accuracy, replacing India’s dependence on foreign timing sources such as GPS for critical infrastructure. Developed jointly by the Department of Consumer Affairs, CSIR-National Physical Laboratory (CSIR-NPL) and ISRO, the demonstration network marks a significant step under the government’s “One Nation, One Time” initiative.
What Is the White Rabbit Technology?
White Rabbit is an Ethernet-based networking technology originally developed at CERN, the European particle physics laboratory, starting in 2008. It was created to meet the extreme timing requirements of the Large Hadron Collider, where particles circulating at nearly the speed of light need to be coordinated with picosecond-level precision. The name is a reference to the White Rabbit from Lewis Carroll’s Alice in Wonderland, who is always worried about being late.
The technology combines two key standards to achieve its extraordinary accuracy. The first is the Precision Time Protocol (PTP), defined in IEEE Standard 1588, which synchronises clocks across a network through a master-slave message exchange. The second is Synchronous Ethernet (SyncE), which locks the clock frequency of every device on the network to a single master reference clock at the physical layer. By adding a phase measurement technique called Digital Dual Mixer Time Difference (DDMTD), White Rabbit extends PTP to deliver sub-nanosecond accuracy and picosecond-level precision over fibre optic links spanning up to 10 kilometres.
In 2020, White Rabbit was formally incorporated into the IEEE 1588-2019 standard as the High Accuracy profile (Annex M), making it the most precise implementation of PTP available today. Its hardware designs, firmware and software are all open source, which has encouraged adoption beyond particle physics. The technology is now used by national metrology institutes, financial trading platforms, telecom networks and scientific facilities worldwide.
Indian Standard Time: The Nation’s Timekeeper
CSIR-National Physical Laboratory (CSIR-NPL), headquartered in New Delhi and established in 1950, is the designated National Metrology Institute of India. It is responsible for the realisation, maintenance and dissemination of Indian Standard Time (IST) under the Standards of Weights and Measures Act. IST is defined as UTC(NPLI) plus 5 hours 30 minutes, where UTC(NPLI) is India’s physical realisation of Coordinated Universal Time (UTC).
The primary timescale at CSIR-NPL is generated using a bank of ultra-stable atomic clocks: five caesium (Cs) atomic clocks and two active hydrogen masers. Caesium clocks provide excellent long-term stability, while hydrogen masers offer superior short-term stability. Together, they keep IST accurate to within ±2.8 nanoseconds of UTC. The international reference, UTC, is maintained by the International Bureau of Weights and Measures (BIPM) headquartered in Sevres, France.
India’s first caesium fountain primary frequency standard, NPLI-CsF1, became operational in 2012 and was approved by the BIPM’s Consultative Committee on Time and Frequency. A second fountain clock, NPLI-CsF2, is under development, alongside an optical clock based on a single trapped ytterbium ion under project STIOS.
CSIR-NPL disseminates IST through multiple channels: the Network Time Protocol (NTP) service accessible at time.nplindia.org, satellite-based links using GNSS Common View and Two-Way Satellite Time and Frequency Transfer (TWSTFT), the NavIC satellite navigation system, and telephone-based services such as FonOclock. However, these methods offer varying levels of accuracy. NTP typically achieves millisecond-level synchronisation, while satellite-based methods deliver tens of nanoseconds. The new White Rabbit network raises the bar to sub-nanosecond accuracy, comparable to the best international standards.
Why India Needs an Indigenous Time Network
Today, most digital systems in India rely on foreign timing sources, primarily the Global Positioning System (GPS) operated by the United States. GPS provides free and widely available timing signals, but dependence on an external system controlled by another country creates serious vulnerabilities. GPS signals can be spoofed, jammed or disrupted, and the system can be degraded or switched off during conflicts without notice.
Several critical sectors require time synchronisation at levels far beyond what ordinary networks can provide. Even a microsecond mismatch can cause significant problems in these domains:
| Sector | Why Precise Time Matters |
|---|---|
| Banking and Finance | Stock exchanges and high-frequency trading platforms need microsecond-level timestamps for fair and accurate transaction sequencing |
| Telecommunications | Mobile networks, especially 5G, depend on synchronised base stations to prevent call drops and data loss |
| Power Grids | Smart grids require phase-synchronised measurements across substations to maintain grid stability and prevent blackouts |
| Defence and Cyber Security | Secure communications, encrypted networks and intrusion detection systems rely on trusted time sources |
| Digital Governance | E-governance platforms, digital signatures and online transactions need verifiable timestamps |
The White Rabbit network directly addresses these concerns. Because it distributes IST through terrestrial optical fibre links rather than satellite signals, it is immune to GPS spoofing and jamming. The time signal remains under India’s sovereign control at every point, from the atomic clocks at CSIR-NPL to the end user. Pralhad Joshi said the system eliminates India’s reliance on foreign time sources like GPS and provides maximum protection against cyber attacks and data manipulation.
How the Demonstration Network Works
The demonstration network at RRSL Bengaluru in Jakkur serves as a proof of concept for the nationwide roll-out. The Legal Metrology Division of the Ministry of Consumer Affairs is the nodal agency for the project. At the heart of the network is a White Rabbit switch connected to CSIR-NPL’s atomic clock ensemble via fibre optic cable. The switch acts as the grandmaster clock, receiving UTC(NPLI) and distributing it downstream to White Rabbit nodes at customer premises.
The network uses an advanced Precision Time Protocol (PTP)-based Ethernet network extension to deliver sub-nanosecond accuracy and microsecond-level synchronisation over long distances. Since White Rabbit operates over standard Gigabit Ethernet fibre, it can use the extensive network of BSNL’s existing optical fibre infrastructure, significantly reducing the cost and time required for deployment.
CSIR-NPL has been working on White Rabbit technology for several years. Its research team has already demonstrated time transfer over a 90 km round-trip dark fibre link with a standard deviation of just 64.5 picoseconds, and has developed active phase compensation techniques to counter temperature-induced variations in fibre optic cables.
Successful Verification Between Bengaluru and Chennai
The Department of Consumer Affairs, in collaboration with CSIR-NPL, ISRO, SEBI, the National Stock Exchange (NSE) and BSNL, has successfully completed a verification test of secure IST transmission between RRSL Bengaluru and the NSE facility in Chennai using White Rabbit technology. This end-to-end test over a real-world distance demonstrated that the system can deliver trusted and highly accurate timing to one of India’s most time-sensitive applications: financial market transactions.
Stock exchanges require extremely precise timestamps to ensure fair and transparent trade execution. The Securities and Exchange Board of India (SEBI), established in 1988 and headquartered in Mumbai, has mandated time synchronisation for all market participants. The successful Bengaluru-Chennai test confirms that White Rabbit technology can meet these stringent regulatory requirements.
Earlier on the day of the launch, Joshi visited ISRO headquarters in Bengaluru to review the progress of the broader Indian Standard Time Dissemination Project. He inspected the facilities and interacted with scientists and engineers. ISRO Chairman Dr. V. Narayanan and ISTRAC Director Raghavendra M. R. were present at the launch event.
The Road Ahead
The demonstration network at RRSL Bengaluru is the first step in a phased national roll-out. CSIR-NPL, in collaboration with the Department of Consumer Affairs and ISRO, is already establishing IST-traceable secondary timing centres at five RRSLs across India: Ahmedabad, Bengaluru, Bhubaneswar, Faridabad and Guwahati. Each centre is being equipped with redundant timescales consisting of passive hydrogen masers, traceable to UTC(NPLI) through the Indian Regional Navigation Satellite System (IRNSS/NavIC) and GNSS Common View.
The government has also signed an MoU with the Department of Telecommunications (DoT) to establish Time Source Centres (TSCs) across the country for terrestrial distribution of IST to licensed telecom service providers. These TSCs will receive their primary time reference from CSIR-NPL and provide timing signals through PTP, NTP and SyncE interfaces.
Secretary of the Department of Consumer Affairs, Nidhi Khare, said the initiative would strengthen consumer confidence, support ease of doing business and contribute to India’s digital transformation. She noted that the project is aligned with the government’s vision of “Viksit Bharat” and “Atmanirbhar Bharat” , reflecting a push towards technological self-reliance.
Once fully deployed, the White Rabbit-based IST dissemination network will position India among a select group of nations with sovereign precision time dissemination capabilities. Countries such as the United States (with UTC(NIST) ), Germany (UTC(PTB) ) and Japan (UTC(NICT) ) already operate similar high-precision terrestrial time distribution networks. India’s entry into this league underscores the growing strategic importance of time as a critical piece of national infrastructure.
Key Takeaways
- Union Minister Pralhad Joshi commissioned the White Rabbit Technology-based IST Dissemination Demonstration Network at RRSL Bengaluru on 16 July 2026.
- The network delivers sub-nanosecond accuracy using Precision Time Protocol (PTP) , Synchronous Ethernet (SyncE) and Digital Dual Mixer Time Difference (DDMTD) phase measurement.
- White Rabbit technology was originally developed at CERN starting in 2008 and was incorporated into IEEE 1588-2019 as the High Accuracy profile in 2020.
- CSIR-NPL maintains Indian Standard Time using five caesium clocks and two active hydrogen masers, with an uncertainty of ±2.8 nanoseconds relative to UTC.
- A successful verification test of secure IST transmission was completed between RRSL Bengaluru and the National Stock Exchange facility in Chennai.
- The project is part of the government’s “One Nation, One Time” initiative and aligns with the Viksit Bharat and Atmanirbhar Bharat vision.
- Five RRSLs at Ahmedabad, Bengaluru, Bhubaneswar, Faridabad and Guwahati are being upgraded as IST-traceable secondary timing centres.
