SecurePNT 6200 PNT-6250S Resilient PNT Clock with DOCXO Holdover and STL LEO Receiver

Resilient PNT clock and GPS transcoder with multi-frequency GNSS, LEO STL receiver and DOCXO holdover.

1 PPS stability, GPS/GNSS locked: <5 ns RMS
1 PPS stability, altGNSS LEO locked: <65 ns RMS altGNSS LEO locked to Iridium’s STL service
Holdover performance: <2 µs with DOCXO

Datasheet

Overview

The VIAVI SecurePNT 6200 series is a resilient timing reference built on TrustedPNT technology and a zero-trust multisource platform. Each unit combines a multi-frequency L1/L2/L3/L5 GNSS receiver supporting GEO satellite signals with an optional LEO Satellite Time and Location (STL) receiver, so timing and positioning remain available when GPS/GNSS signals are jammed, spoofed or unavailable. Holdover is provided by an internal DOCXO or rubidium oscillator, and external 10 MHz and 1 PPS inputs allow a cesium clock to be used as a holdover reference.

SecureTime services

The PNT-6250S works with VIAVI SecureTime services, which add alternative and enhanced timing sources on top of GPS/GNSS. altGNSS LEO is a GNSS-independent encrypted source powered by Iridium STL, traceable to UTC(NIST). eGNSS GEO is an enhanced GNSS source with authenticated spoofing detection and mitigation, powered by Fugro AtomiChron on Inmarsat. altGNSS GEO is a GNSS-independent source with authenticated spoofing detection and mitigation, traceable to NIST, powered by Fugro on Inmarsat and other satellite constellations.

Retrofitting legacy clocks

The patented µPNT Transcoder generates a GPS L1 C/A RF output signal, so the unit can be placed between the antenna and an existing GPS/GNSS clock to convert legacy equipment into a resilient PNT clock without replacing it. NMEA messages are available over USB and RS-232, and firmware is field-upgradeable through the same serial ports.

The half-19-inch rack-mountable unit meets the ITU-T G.8272 PRTC-A specification and is NEBS certified. Target users include network operators, data centers, financial transaction timing, deep-indoor timing and positioning, ship-board timing and R&D labs that need a GNSS-independent timing and positioning reference.

Key Features

L1/2/3/5/6+PPP GNSS receiver supporting GEO satellite signals
Optional LEO STL receiver
Holdover options: DOCXO or Rb oscillator (internal)
10 MHz and 1 PPS inputs for external Cesium clock holdover
10 MHz and 1 PPS outputs
Meets PRTC-A ITU-T G.8272 specification
NEBS certified
Half 19-inch width, rack-mountable
Intelligent zero-trust multisource switchover between GNSS, STL LEO, GEO Sat, 10 MHz and 1 PPS
Patented µPNT Transcoder outputs a GPS L1 C/A RF signal to retrofit legacy GPS/GNSS clock equipment
SecureTime altGNSS LEO: GNSS-independent encrypted source, <65 ns RMS traceable to UTC(NIST), powered by Iridium STL
SecureTime eGNSS GEO: enhanced GNSS source with authenticated spoofing detection/mitigation, <5 ns RMS, powered by Fugro AtomiChron on Inmarsat
SecureTime altGNSS GEO: GNSS-independent source with authenticated spoofing detection/mitigation, <±100 ns peak-to-peak, traceable to NIST
Augmented PNT clock for GPS/GNSS-denied or indoor environments
Multi-frequency GNSS tracking of GPS, Galileo (SBAS), GLONASS, BeiDou, QZSS and NAVIC
NMEA messages over USB and RS-232
Fully field-upgradeable firmware through USB or RS-232 serial ports
Single or dual redundant +12 V DC power inputs

Specifications

Timing Performance

1 PPS stability, GPS/GNSS locked	<5 ns RMS Traceable to UTC/NIST
1 PPS stability, altGNSS LEO locked	<65 ns RMS altGNSS LEO locked to Iridium’s STL service Traceable to UTC/NIST; with LEO STL receiver
Holdover performance	<2 µs with DOCXO Over 24 hours @ 25°C, no airflow, no motion; after 7 days with GNSS reference. Datasheet lists this for model 6250/6250S

µPNT Transcoder

Transcoder output	GPS L1 C/A RF output signal to retrofit legacy GPS/GNSS clock equipment Patented multisource-to-GPS transcoder
NMEA messages	USB and RS-232 connectors, GGA, RMC, ZDA, GSV, PASHR, GSA

GPS/GNSS Receiver

Multifrequency	L1, L2, L3, L5
Constellations	GPS/Galileo (SBAS)/GLONASS/BeiDou/QZSS/NAVIC
Acquisition (C/N0 threshold)	33 dB-Hz Tracking performance
Tracking (C/N0 threshold)	20 dB-Hz Tracking performance
TTF, cold start	<45 sec
TTF, warm start	<20 sec
TTF, reacquisition	1 sec
GEO Sat signals	Integrated GEO receiver

Multisource Switchover

Intelligent zero-trust multisource switchover	GNSS (4 frequencies), STL LEO, GEO Sat, 10 MHz, 1 PPS

Inputs

External reference inputs for Cesium holdover clock	10 MHz Sine Wave (0 dBm to +15 dBm), 1 PPS CMOS options
1 PPS input	1 x 1 PPS Input, SMA, >1 K Load

Outputs

10 MHz	2x +13 dBm 10 MHz sine wave, low phase noise option
10 MHz accuracy	<±0.2E-010 after 20 min with GNSS
1 PPS	2 x 1 PPS Outputs via SMA (Coax) (>1K Load), 3.3 V
Frequency	10 MHz DOCXO or Rb oscillator option
Spurs	<-110 dBc/Hz
Oscillator	DOCXO From ordering description: Transcoder DOCXO GNSS-T STL ROHS
Stability over temperature (holdover mode)	-10° to +75°C: ±0.2E-09 DOCXO option

Power

Supply voltage (Vdd)	Single or Dual redundant +12 V DC inputs
Power consumption	<10 W (DOCXO variant)

Environmental

Operating temperature range	-25°C to +75°C Forced air environment
Storage temperature range	-45°C to +85°C

Mechanical

Size	Half 19” width, 1.64” x 8.53” x 8” (H x W x D)
Weight	1.5 lbs

Connections

RF antenna (one for STL, one for GNSS)	SMA (antenna power enable controls on both ports)
10 MHz in/out, 1 PPS in/out, TTL status	SMA
In situ firmware updates	Fully field upgradeable through USB or RS-232 serial ports

Compliance

Compliance marks	CB: Scheme International Safety; CE: EU Safety and EMC; FCC: USA EMC; RCM: Australia/New Zealand EMC
Emissions	FCC Part 15 (Class A), ICES 003 (Class A), ETSI EN 300 386, CISPR 32, EN 55032, ETSI EN 303 413, ETSI EN 301 489-1, ETSI EN 301 489-19
Immunity	ETSI EN 300 386, ETSI EN 301 489-1, ETSI EN 301 489-19, EN 61000-4-2 ESD, EN 61000-4-3 radiated immunity, EN 61000-4-4 EFT, EN 61000-4-5 surge, EN 61000-4-6 low frequency common immunity, EN 61000-3-2 harmonic emission, EN 61000-3-3 voltage fluctuations and flicker emissions, EN 61000-4-11 voltage dips and interruptions
Safety	IEC 62368-1, EN 62368-1
Other	NEBS GR 1089-CORE
Directives	Safety Directive 2014/35/EU, EMC Directive 2014/30/EU, Radio Equipment Directive (RED) 2014/53/EU, RoHS Directive 2011/65/EU and the (EU) 2015/863 amendment