The project was put together using a generic NEO-6M breakout board, soldered to prototyping board with jumper wires making the necessary connections. I just built my own because I happened to have all of these parts on hand already. Finnegan's full guide, including configuring Raspbian and setting up the necessary daemons, can be found on his blog. Log in Sign up. Please ensure that JavaScript is enabled in your browser to view this page.
See the NTP changelog for details. Start installer of the Visual Studio Redistibutable package:. Visual Studio Setup is complete. It supports IPv4 only, but not IPv6. For current Windows installations the current stable NTP version should be used which also contains current security patches.
Step 3a without initial configuration file : for experienced users - the configuration file must be setup manually. Step 3b: initial configuration with external time server : specification of up to 9 external NTP servers.
This is the case, for example, for SuSE Linux. These features can be used to set up a hierarchical time synchronization structure. The hierarchical levels of the time synchronization structure are called stratum levels. A smaller stratum number means a higher level in the hierarchy structure. On top of the hierarchy there is the daemon which has the most accurate time and therefore the smallest stratum number. By default, a daemon's stratum level is always one level below the level of its reference time source.
The top level daemon often uses a radio clock as reference time source. By default, radio clocks have a stratum number of 0, so a daemon who uses that radio clock as reference time will be a stratum 1 time server , which has the highest priority level in the NTP hierarchy.
In large networks it is a good practice to install one ore more stratum 1 time servers which make a reference time available to several server computers in each department. Thus the servers in the departments become stratum 2 time servers which can be used as reference time source for workstations and other network devices of the department.
Unlike in telecom applications where the word stratum is used e. If the time source currently selected as system peer becomes unavailable then a new system peer is determined based on this selection algorithm. The stratum level under which a daemon is visible on the network corresponds to the current system peer's stratum level plus 1.
Earlier versions of NTP for Windows assumed the ntp. In most installations the ntp. Each of those lines specifies one reference time source which can be either another computer on the network, or a radio clock connected to the local computer.
Reference time sources are specified using IP addresses, or host names which can be resolved by a name server. This IP address must not be mixed up with Most Linux distributions come with a precompiled NTP package where the parse driver has been enabled. However, NTP packages shipped with older Solaris version have been built without the parse driver. There's also a Linux driver for Meinberg PC plug-in cards available on the Meinberg software download page.
Besides ways to configure and monitor the plug-in cards this driver provides a software interface which lets NTP's parse driver read the reference time from a plug-in card rather than via a serial port under Linux.
This driver is not required for devices which are directly connected via a serial port. The configuration steps described below must be done by a user with sufficient rights on the system, e. Each symbolic link must point to a physical device which represents an existing radio clock.
In most cases the physical device is a serial port at which a radio clock has been connected externally. However, under Linux this link can also point to a device node which represents a plugin card. Each of the reference clocks must also be specified in the ntp. The pseudo IP address must be followed by a mode m parameter which specifies the type of radio clock represented by the device. The table below lists the mode values which can be used with Meinberg radio clocks:.
In older versions of the driver package before 3. In the next step the file ntp. The file should include a server line for the refclock-0 device created above. If the radio clock sends the Meinberg standard time string at baud and framing 7E2 then, as can be seen from the table above, the mode for refclock-0 must be set to 2.
Also, if plug-in card is used under Linux then mode 2 must always be used: server Since the local clock is not very accurate, it should be fudged to a low stratum: server If the daemon has been shipped with the operating system then it may have support for Meinberg clocks compiled in, or not.
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