OSA 3705 Passive Hydrogen Maser Passive Hydrogen Maser Frequency and Time Standard Introduction Telecommunication networks require highly accurate Passive Frequency and Time Standard OSA 3705 PH clocks for the effective transmission of digital signals. is the number one alternative to a high performance One of the primary objectives of telecommunication are needed. reference when better stability and competitive accuracy networks is to guarantee, at the connection between different networks, a slip rate of less than one slip in 72 days. Meeting these stringent specifications requires the implementation of a Primary Reference Clock (PRC) that generates signals with an accuracy better than 1E-11, at all times. Generally, this is achieved using Cesium or Hydrogen Maser clock technology, often combined with GPS receivers as backup sources. Unlike off-air receivers, Maser clocks are autonomous, self-contained primary references immune from external influences. A well maintained synchronisation backbone minimises network errors, thus increases network efficiency, resulting in a higher quality of service and a greater use of capacity. Highlights Extremely stable frequency reference based on Hydrogen atom transition. Ultimate G.811/Stratum 1 compliant PRS for SDH/SONET synchronisation. Alternative technology to cesium reference sources. Lifetime is not constraint to 10-12 years like with cesium oscillators but 20 years. Low cost hydrogen refurbishment. 2.048/5/10/100 MHz and 1 PPS standard outputs. Digital control and monitoring of all operations on LCD display and keypad. 3 years warranty on Physics package. Expected lifetime: 20 years. Oscilloquartz SA / Rue des Brévards 16 / CH-2002 Neuchâtel Switzerland / Tel.+41(0)32 722 55 55 / Fax+41(0)32 722 55 56 [email protected] / www.oscilloquartz.com Typical Applications Telecommunication systems Reference for test equipment

OSA 3705 Passive Hydrogen Maser Passive Hydrogen Maser Frequency and Time Standard Principle of operation Hydrogen Maser principle of operation is based on quartz oscillator frequency locked to the frequency line of hydrogen atom emission of the discriminator (see bellow). The processor produces signals to control the quency of the hydrogen atoms spectrum line. The influence of the discriminator RF-cavity frequency 5 MHz fluctuation on emission line is eliminated by RF-cavity Interrogation signal unit frequency adjustment to quartz oscillator frequency. As discriminator energy level emitted by...