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Technical Specifications

Hardware

Server

  • Supermicro SuperServer 5018R-WR rackmount server with 1U chassis and X10SRW-F motherboard:

    • Four 8cm counter-rotating PWM fans
    • One passive CPU heatsink
    • Two riser cards
    • Four hot-swap 3.5" drive bays (SATA)
  • Intel 1.8 GHz Quad-Core Xeon Processor
  • 8 GB RAM
  • Two Western Digital Re 1 TB Enterprise-Class Hard Drives in RAID Mirroring configuration
  • Two redundant, hot-swap power supplies, 100-240 VAC auto-switch, 50-60 Hz, 500 W each, with IEC60320 C14 inlet coupler
  • Connectivity:

GPS/GNSS Receiver

  • Connector: SMA, +5V to power active antenna (SMA-to-Type-N-adapter cable included)
  • Frequency: GNSS L1 (1575.42 MHz)
  • Satellite tracking: 1 to 50, T-RAIM satellite error management
  • Synchronization time:
    • Cold start < 15 minutes (includes almanac download)
    • Warm start < 5 minutes (assumes current almanac downloaded)
  • GNSS Antenna system: See antenna installation guide (antenna sold separately)

Oscillator

Oscillator accuracies

  OCXO Rb
Accuracy to UTC (1 sigma locked to GPS) 50 ns 25 ns
Holdover Accuracy (loss of GPS signal after 2 weeks locked, constant temperature)
After 4 hours 1μs 0.2 μs
After 24 hours 25 μs 1μs

Notes:

• Accuracy to UTC is measured by comparing the internal 1PPS with the GPS ontime point.

• When ordering a VelaSync unit, either an OCXO or Rubidium oscillator must be specified.

• The specifications are subject to a steady environment temperature.

I/O Connectors

Timing Connector

The pre-installed TSync-model 25-pin Micro D-Sub Connector, when combined with the adaptor cable and breakout cable (both included), provides the following I/O options:

Inputs:

  • 1 PPS Input
    • 1 Hz pulse, rising edge or falling edge active (selectable); 100 ns minimum pulse width
    • Amplitude: 0 V to +5.5 V input range, +0.8 VVIL, +2.0 VVIH
    • Input impedance: <150 pF capacitive
  • IRIG AM Input

    • Accepts IRIG formats A, B, G; NASA36; IEEE 1344
    • Amplitude: 500 mVp-p to 10 Vp-p
    • Modulation ratio: 2:1 minimum, 6:1 maximum
    • Input impedance: 10 kΩ minimum
    • DC Common Mode Voltage: ±150 VDC maximum
    • Input Stability: Better than 100 ppm
  • IRIG DCLS Input

    • Accepts IRIG formats A, B, G; NASA36; IEEE 1344 pulse width codes (does not accept Manchester modulated codes)
    • RS-485 differential input: –7V to +12 V common mode voltage input range, 200 mVp-p differential voltage threshold
    • Single-ended input:
      • +1.3 V VIL min, +2 V VIH max
      • +1.45 V VIL typ, +1.85 V VIH typ
  • GPIO Inputs

    • Amplitude: 0V to +5.5 V input range, +0.8 VVIL, +2.0 VVIH

    • Polarity (selectable): Positive or negative
    • Input impedance: <150 pF capacitive
    • 50 ns active pulse width minimum; 50 ns minimum between pulses
    • Repetition rate. More than 10,000 events per second
    • Resolution: 5 ns

Outputs

  • 1 PPS Outputs

    • 1Hz pulse, rising edge or falling edge active (selectable)
      • 40 ns to 900 ms active pulse width (selectable, 200 ms default)
    • Rise time: <10 ns
    • Signal level: TTL compatible, 4.3 Vmin, base-to-peak into 50 Ω
      [PCIe only: TTL compatible, 2.2 V minimum, base-to-peak into high impedance]
    • Accuracy: Positive edge within ±[X] nanoseconds of UTC when locked to a valid 1PPS input reference (for [X], see table below).

      1 PPS output accuracy

        TCXO OCXO OCXO (Rugged Option, cPCI & VPX only)
      Accuracy to UTC (1-sigma locked to GPS) ±50 ns ±50 ns ±25 ns
      Holdover (constant temp after 2 weeks of GNSS lock)
      After 4 hours 12 μs 3 μs 1 μs
      After 24 hours 450 μs 100 μs 25 μs
  • 10 MHz Output

    • 10 MHz sine wave output from oscillator

      • Output impedance: 50 Ω nominal
      • Output load: 50 Ω minimum
      • Output harmonics: < -40 dBc
      • Output spurious: < -70 dBc
  • IRIG AM Output

    • Output formats A, B, E (100 Hz, 1 kHz), G; NASA36; IEEE 1344
    • Amplitude:
      • 0.5 Vp-p to 6 Vp-p into 50 Ω, user settable
      • 1Vp-p to 12 Vp-p into > 600 Ω
    • Output impedance: 50 Ω nominal
    • Output load: 50 Ω minimum
    • Modulation ratio: 3:1 nominal
    • Accuracy: ±2 to 200 microseconds (IRIG-format dependent)
  • IRIG DCLS Output

    • Outputs formats: A, B, E, G; NASA36; IEEE 1344 pulse width codes (does not generate Manchester modulated codes)
    • RS-485 differential signal:
      • 1.8 Vmax common mode output voltage (RS-485 compatible)
      • 1.5 Vmin to 3.3 V max differential output voltage swing
    • Single-ended amplitude (100 Ω load):
      • 0.5 VVOL max, +2.5 VVOH min (TTL compatible)
  • GPIO Outputs

    Periodic Output:

    • Amplitude: TTL compatible, 4.3 Vmin, base-to-peak into 50 Ω
      [PCIe only: 2.2 V minimum, base-top-peak into high impedance]
    • Pulse width: 50 ns to 999 ms active pulse width, in 20 ns increments
    • Period: 100 ns min, 60 s max, in 20 ns increments
    • Polarity (selectable): Positive or negative

    Time-Match/Alarm Output

    • Amplitude: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω; 2.2 V minimum, base-to-peak into high-impedance
    • Range: 100 days in 5 ns steps

Communication Ports

2x 10 GbE SFP+ (optionally 4x, or 2x 10 Gb plus 2x 40 Gb1Please inquire about availability.)

2x 1GbE RJ-45 with hardware time stamping

1x IPMI (V.2.0)

1x RS-232 (Fast UART)

4x USB 2.0

1x VGA

Environmental Specifications

  • Operation: 10°C to 35°C, RH: 8 to 90% (non-condensing @ 35°C)
  • Storage: –40°C to +50°C , RH: 5 to 95% (non-condensing @ 35°C)

Size, Weight & Power

  • Dimensions: (WxHxD) 437 x 43 x 650 mm (17.2 x 1.7 x 25.6 in.)
  • Weight: 23.5 lbs. (10.7 kg)
  • Max. power draw (@ 20°C, 2 power supplies running, 2 hard disks installed)
    • 100 W typical
    • 120 W startup
  • AC input: 100 to 240 V, 50 to 60 Hz, 6.2 to 2.6 A

 

For additional hardware specifications, see the User's Manual of the Original Equipment Manufacturer:

https://www.supermicro.com/manuals/superserver/1U/MNL-1771.pdf