GPS / GNSS NTP Time Server
The PreciseSync-SMC-300-R is a fully redundant GPS and GNSS time synchronisation server built for networks that cannot afford a gap in timekeeping. Two independent GPS receivers, two master clocks, a comparator unit and dual power supplies work side by side inside one chassis, so the server keeps distributing accurate time even if one path fails. It locks to GPS, GLONASS, Galileo, BeiDou and NavIC signals to within 30 nanoseconds and feeds that time out as Stratum 1 NTP, IRIG-B and 1PPS to substations, data centers, telecom networks and defence systems.
Key Features
Most time servers stop working the moment one component fails. The PreciseSync-SMC-300-R is built around the opposite assumption. Every critical section is duplicated and continuously checked, so a single fault never becomes a plant-wide timing outage.
Dual-Path Redundancy
Two complete GPS receive chains, two master clocks and two power supplies run in parallel inside the same 3U chassis. A dedicated comparator unit continuously checks both master clocks against each other and switches to the healthy path automatically, so protection relays, RTUs and control systems never see a break in the time signal.
30 ns GNSS Lock Accuracy
A 184 channel parallel tracking receiver locks onto GPS L1/L2, GLONASS, Galileo, BeiDou and NavIC signals with 30 nanosecond timing accuracy. Acquisition sensitivity of minus 148 dBm and tracking sensitivity of minus 167 dBm keep the server locked even where antenna placement or sky visibility is less than ideal.
OCXO and Rubidium Holdover
A high stability OCXO ships as standard, holding frequency to within 10 parts per billion through short GNSS outages. For sites that need longer autonomy, such as remote substations or enclosed equipment rooms with intermittent sky view, a Rubidium oscillator option extends holdover to roughly 1 microsecond of drift over 24 hours.
Stratum 1 NTP and SNTP
The server operates as a Stratum 1 NTP and SNTP source with multicast and broadcast support. NTP timestamp accuracy at the server stays under 1 microsecond, with client side accuracy depending on network design.
IRIG-B, 1PPS and Fiber Distribution
Time can leave the server as AM or TTL IRIG-B, 1PPS, DCF77, or configurable pulse outputs (1 PPM, PPS, PPD, PPH), or over ST fiber at 820 nanometers for sites where electrical isolation matters. A programmable output section also supports 1.544 MHz, 2.048 MHz and 10 MHz frequency references plus IEC 60870-103/104 for substation automation.
Browser-Based Configuration and SNMP Monitoring
Every setting, from network parameters to alarm thresholds, is reachable through an HTTPS/SSL browser interface or the front panel keypad. SNMP v1, v2c and v3 with trap generation, syslog (RFC 3164 and RFC 5424) and user defined access control lists let IT and OT teams monitor and lock down the server from a central network management console.
Live signal flow
Three stages, running across two independent paths, turn satellite signals into a time reference your infrastructure can depend on.
Redundant GNSS antennas and receivers lock independently onto GPS, GLONASS, Galileo, BeiDou and NavIC satellites, each feeding its own master clock.
The onboard comparator unit cross-checks both master clocks against each other in real time. If one receiver loses lock or drifts, the server flags it and keeps distributing time from the healthy path without interruption.
Verified time is pushed out simultaneously as Stratum 1 NTP, IRIG-B, 1PPS, DCF77 and fiber signals, so every downstream device, from a protection relay to a core router, stays on the same clock.
PreciseSync - SMC - 300 - R
Stratum-1 NTP Time Server
--:--:--.---
Now syncing → Power Utilities
Power Utilities
IEC 60870-103/104 grid and substation integration
SyncingRailways & Metros
Signalling & SCADA
Automation
C&I process control
Applications
Explore the industries where the PreciseSync-SMC-300-R is deployed and the operating problems it helps solve.
Complete electrical, mechanical and protocol details for the PreciseSync-SMC-300-R time server.
| Parameter | Specification |
|---|---|
| Model | PreciseSync-SMC-300-R |
| Constellations | GPS L1 C/A, L2C; GLONASS L1OF, L2OF; Galileo E1B/C; BeiDou B1I, B2I; NavIC-IRNSS |
| Channels | 184 channel parallel tracking (L1, L2, L5 bands) |
| Acquisition / Tracking Sensitivity | -148 dBm / -167 dBm |
| GNSS Lock Accuracy | 30 ns |
| Antenna Model | T-GPA-014-S15, helical, axial ratio under 4 dB |
| Antenna Protection | IP67, fixed roof mount, -40C to +85C |
| Display | 2x16 / 2x20 LCD |
| Protocols | NMEA, Sertel format, serial string ASCII |
| Parameter | Specification |
|---|---|
| OCXO (standard) | 10 PPB stability |
| Rubidium (optional) | 0.1 PPB stability, about 1 microsecond drift per 24 hour holdover |
| VCTCXO | Available, confirm at order |
| Disciplined Oscillator | Available, confirm at order |
FAQ
Talk to a Sertel applications engineer for a configuration, datasheet and quotation for the PreciseSync-SMC-300-R, sized to your substation, data center or network.
