Redundant Stratum 1 GNSS Time Server
The PreciseSync-GMC-300-R is a redundant, multi-constellation GPS/GNSS time server built to keep substations, data networks and industrial control systems on a single, traceable time base. Every critical stage, from GNSS reception to the grand master clock, comparator and power supply, is duplicated, so synchronisation continues without interruption even if one path fails. It distributes IEEE 1588v2 PTP, NTP, IRIG-B and 1PPS signals at Stratum 1 accuracy to protection relays, RTUs, PLCs and industrial networks.
Key Features
Time synchronisation only matters if it keeps working when something goes wrong. The PreciseSync-GMC-300-R is engineered around that principle, pairing full hardware redundancy with wide protocol support so every connected device, from a protection relay to a data centre switch, shares the same accurate time reference.
Multi-Constellation GNSS Tracking
Tracks GPS L1 C/A and L2C, GLONASS L1OF and L2OF, Galileo E1B/C and BeiDou B1I and B2I signals, with NavIC/IRNSS support, through a 184 channel parallel tracking receiver. Acquisition sensitivity of minus 148 dBm and tracking sensitivity of minus 167 dBm keep the receiver locked even where satellite visibility is limited.
15 ns GNSS Lock Accuracy
Delivers 15 ns GNSS lock accuracy with a PTP timestamp accuracy of under 100 ns, meeting the precision that protection relays, phasor measurement units and SCADA systems need for correct event sequencing and fault recording.
Stratum 1 NTP and PTP Distribution
Generates Stratum 1 time directly from the GNSS reference and distributes it as IEEE 1588v2 PTP, in both 1 step and 2 step, P2P and E2E modes, alongside NTP, so IT and OT networks can run from the same clock without a secondary reference server.
IRIG-B, 1PPS and Fiber Outputs
Supports IRIG-B in AM and TTL form, DCF77, 1PPS, PPM and PPH pulse outputs, differential serial outputs and ST fiber distribution at 820 nm, covering legacy protection equipment and modern fiber-fed substations from one chassis.
Built and Tested for Harsh Environments
Rated for minus 10 to plus 55 degrees C operation and minus 40 to plus 85 degrees C storage, and qualified against IEC 60068, the IEC 61000-4 EMC immunity series and IEC 60255-5-0 dielectric strength standards for substation and industrial deployment.
Secure Web-Based Configuration
Configurable over HTTPS/SSL through the Sertel Time Management Suite or from the front panel keypad, with SNMP v1, v2c and v3 monitoring, user defined access control lists and Syslog notification for centralised oversight.
Live signal flow
Accurate network time starts in orbit and ends at the device that needs it. The PreciseSync-GMC-300-R carries a signal through three stages, each backed by redundant hardware, before it reaches a single downstream port.
The T-GPA-014-S15 helical GNSS antenna acquires signals from GPS, GLONASS, Galileo, BeiDou and NavIC/IRNSS constellations across a 24 channel parallel front end, feeding a dual, redundant GNSS receiver pair so reception continues even if one receiver path is lost.
A high-stability oscillator, OCXO as standard or Rubidium for extended holdover, disciplines the incoming GNSS signal to UTC. If satellite signal is lost, the Rubidium option maintains 1 microsecond accuracy over a 24 hour holdover period, keeping downstream systems synchronised through short outages.
The disciplined time base is distributed as Stratum 1 NTP and IEEE 1588v2 PTP over dual Gigabit Ethernet, plus IRIG-B, 1PPS and fiber outputs, so every connected relay, server and controller draws from the same reference at the same time.
PreciseSync - GMC - 300 - R
Multi-GNSS Grandmaster
--:--:--.---
Now syncing → Power Substation
Power Substation
IEC 61850-9-3 grid sync
SyncingData Center
Stratum-1 NTP for servers
Telecom / 5G
PTP backhaul timing
Defense
Hardened secure time
Broadcast
Frame-accurate sync
Railways & Metros
Signaling & SCADA
Finance
MiFID II timestamping
Automation
C&I process control
Applications
Any network that depends on a shared, traceable time reference can run on the PreciseSync-GMC-300-R, including:
Full electrical, mechanical and protocol specifications for the PreciseSync-GMC-300-R.
| Parameter | Specification |
|---|---|
| Receiving Frequency | L1: 1575.42 MHz | L2: 1227 MHz | L5: 1176.45 MHz (1176 MHz on request) |
| Tracking Code | L-Band C/A code |
| Number of Channels | 24 channels, parallel |
| Antenna Type | Helical, axial ratio under 4 dB |
| Supply Voltage | +5 V DC (internal) |
| Gain / Noise Figure | Over 40 dB / under 1.5 dB |
| Operating Temperature | -40 degrees C to +85 degrees C |
| Connector / Mounting | BNC; fixed roof mount, IP67 |
| Dimensions | Diameter 93 mm, height 133 mm |
| Parameter | Specification |
|---|---|
| Model | PreciseSync-GMC-300-R |
| Constellations | GPS L1 C/A and L2C, GLONASS L1OF and L2OF, Galileo E1B/C, BeiDou B1I and B2I, NavIC/IRNSS |
| Channels | 184 channel parallel tracking |
| Frequency Band | L1, L2 and L5 |
| Sensitivity (Acquisition / Tracking) | -148 dBm / -167 dBm |
| Interface | TTL (normal high) |
| Input Connector | BNC female, twist-lock |
| Output Rate | Once per second |
| Display | Two 4x20 LCD panels |
| Protocols | NMEA, Sertel format, Serial String ASCII |
| Physical Design | 3U and 2U rack-mount bracket for 19 inch cabinet, fabricated heatsinks |
| Parameter | Specification |
|---|---|
| OCXO | Standard; high-precision 10 PPB stability |
| Rubidium | Standard-grade option; 0.1 PPB stability with 1 microsecond / 24 hour holdover |
| Disciplined Oscillator | Available, confirm at order depending on output configuration |
| VCTCXO | Available, confirm at order depending on output configuration |
FAQ
Talk to a Sertel engineer for a tailored configuration, datasheet and pricing for the PreciseSync-GMC-300-R.
