GNS181PEX: Low Profile GPS / GLONASS / Galileo / BeiDou Clock (PCI Express)

GNS181PEX: Low Profile GPS / GLONASS / Galileo / BeiDou Clock (PCI Express)

Low Profile GPS / GLONASS / Galileo / BeiDou Clock (PCI Express)

The board GNS181PEX is designed as a low profile board for computers with PCI Express interface. The rear slot cover integrates the SMA antenna connector, a BNC connector for modulated time codes, a 9pin D-SUB male connector and four status LEDs (2mm light pipes). With this standard height bracket you can use the D-SUB connector for I/O signals like RS-232 – PPS and PPM and you can use this interface for firmware updates.

The GNS181PEX is delivered including a low profile bracket. You can mount this part instead of the standard bracket, to run the GNS181PEX in computers with smaller housing (e.g. 1U server).

The integrated GNSS receiver requires an external antenna. It can be configured to use GPS, Galileo, Beidou and GLONASS. The configuration allows the user to select one of these sources to be used exclusively or a combination with up to three of these sources:

  • GPS
  • BeiDou
  • GPS + BeiDou
  • Galileo
  • GPS + Galileo
  • Galileo + GLONASS
  • Galileo + BeiDou
  • GPS + Galileo + GLONASS
  • GPS + Galileo + BeiDou


Product Description

This PCI Express slot card is the best choice for adding a highly accurate time base to your servers or workstations. It can be used as a stratum 0 reference time source for NTP and transforms any machine into a Stratum 1 NTP server without consuming additional physical space in your server room.

The GNS181PEX comes with a truckload of features to enable software developers to overcome the timing limitations of COTS operating systems like Linux or Windows. The powerful and highly functional Meinberg API (Application Programming Interface) delivers an easy to use and portable way of accessing all Meinberg bus level timing devices, including ISA, PCI, PCI-X, PCI Express and USB time synchronization products.

Legacy interfaces like IRIG, 1PPS or serial time strings can be used to connect other equipment to the PCIe slot card and transfer the time base over dedicated cable connections to systems which cannot be synchronized via NTP or other network protocols.

The new Memory Mapped Access feature offers a fast, simple and efficient way of reading the current time with high precision.

The drivers package for Windows contains a time adjustment service which runs in the background and adjusts the Windows system time continuously and smoothly. A monitor program is also included which lets the user check the status of the device and the time adjustment service, and can be used to modify configurable parameters, if run with administrator rights.

The driver packages for Linux and FreeBSD contain a kernel driver which allows the board to be used as a reference time source for the NTP daemon which is shipped with most Unix-like operating systems. This also turns the computer into an NTP time server which can also provide accurate time to NTP clients on the network. Some command line tools can be used to setup configurable parameters and monitor the status of the board.

For usage of the card on other operating systems please contact Meinberg support:

The device’s serial port is not required for operation but can be used to update the card’s firmware, or provide another computer with the current time via a serial time string.

Satellite receiver for mobile applications:
The GNSS timing board is designed for operating in mobile environments like cars, trains or airplanes. An optimized active GPS antenna RV-76 with 10 meters coax cable RG-58 for operation in mobile environment is still available.

Additional information

Key Features

Key Features
Years of warranty: 3 RoHS compliant
PCI Express Interface
2 time trigger inputs
Programmable Pulse Outputs
Frequency Synthesizer and Time Code Mode
Memory Mapped I/O time reads for high access rates
RS232 interface
IRIG-B/AFNOR time code outputs
Plug and Play
Antenna connected with up to 70m of coax cable type Belden H155
Configurable time scale (UTC/local, GPS time, TAI)
Driver software for all popular operating systems
Possible usage in mobile applications
Including 40 dB Multi GNSS L1 antenna, 20m pre-assembled Belden H155 cable and technical documentation on USB key


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