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AR79/AS79
Accurate Time & Frequency Server

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GNSS-Disciplined Rubidium

The AR79/AS79 is a multi-function GNSS Disciplined Rubidium Atomic Clock, which provides accurate time & frequency. The AR79/AS79 incorporates numerous features into a single box, including a Rubidium Frequency Standard, an internal C/A code 12 channels GPS receiver and external 1PPS input. The Rubidium Standard functions as a local oscillator and is phase-locked to the GPS or to external input. All outputs are derived from the Rubidium Clock, which maintains accurate time and frequency when the GNSSor other inputs are interrupted.

The AR79/AS79 extensively supports the evolving needs for broadband access services delivery, including high throughput, flexible management capabilities, and a high degree of scalability and flexibility to cater for future requirements and technology trends. The AS79 offers advanced Quality of Service (QoS) features including classification and mapping based on layer 1 through layer 4 attributes, rate limiting per service, with highly flexible scheduling, queuingand shaping options.

Product Highlights

1E-10/month

Long Term Stability

20ns RNS

1 PPS Accuracy

113 dBc/Hz

Phase Noise

Performance (Rubidium Mode)
Frequency
Standard
_1
Text
_3
Time (1PPS)
1PPS accuracy
Discipline
20ns RMS
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Free running
1μs / 24 hours (typical) After 24 hours of disciplining
Frequency
Frequency Accuracy
≤ 1E-12 (Disciplined to GPS or to external 1PPS)
Long Term Stability (Free running Rubidium)
≤1E-10 / month
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Short Term Stability (ADEV)
3E-11 @ 1s 5E-12 @ 100s
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Temperature Stability
±3E-10 over -20°C to +65°C
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Standard
Improved
Ultimate
Phase Noise (@ 10MHz)
≤-114dBc/Hz @ 10Hz ≤-140dBc/Hz @ 100Hz ≤-146dBc/Hz @ 1KHz ≤-147dBc/Hz @ 10KHz
≤-113 dBc/Hz @ 10Hz ≤-141 dBc/Hz @ 100Hz ≤-152 dBc/Hz @ 1KHz ≤-156 dBc/Hz @ 10KHz Integrated phase noise (10Hz to 1MHz): ≤-94dBc
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Harmonics
≤ -45 dBc
Spurious
≤ -90 dBc @±100KHz
Warm-up time
Rubidium Lock < 4 minutes 5E-11 within < 60 minutes 1E-11 within < 4 hrs 1E-12 within < 24 hrs

AS79 Key Features

  • AccuBeat’s proprietary Anti Spoofing solution

  • Frequency Accuracy: 1E-12

  • 1PPS Accuracy: 20ns RMS

  • Holdover: 1μs/24 hours, 1E-10/month

  • 20 outputs (10MHz, 1PPS, TOD)

  • 12 channel C(A) code GPS receiver

  • Dual AC Power supply 90-260 VAC

  • LCD Front Panel Display showing TOD, synch status and more

AS79 Key Applications

  • GNSS Denied Scenarios

  • Power Utilities

  • Communications Networks

  • Financial Services

  • Server Networks

  • Enterprise Networks

  • Satellite Ground Stations

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