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+<!--
+title: Stratum 1 NTP Server participating in ntppool.org
+date: 2025-03-13
+-->
+
+![](https://numbers.hottis.de/ntp/packets-load.png)
+
+![](https://numbers.hottis.de/ntp/stratum-rootdisp.png)
+
+[Details at ntppool.org](https://www.ntppool.org/scores/93.241.86.156)
+
+## Harrison
+![](/static/IMG_6089.jpg)
+![](/static/IMG_6088.jpg)
+
+Setup details for this machine are here: [https://gitea.hottis.de/wn/harrison-setup](https://gitea.hottis.de/wn/harrison-setup).
+
+The snmpd subagent for monitoring the ntp daemon is here: [https://gitea.hottis.de/wn/snmp-agentx-ntpsec](https://gitea.hottis.de/wn/snmp-agentx-ntpsec).
+
+### Details of Setup
+
+A GPS receiver (ublox Neo-6M) is connected via a RS232 level converter (MAX232) and via the RS232 connection to a machine (it was not easy to find one with RS232) with a Debian installation.
+
+The PPS signal of the GPS receiver is transmitted via the DCD line of the RS232 connection. That in turn is evaluated by the NMEA line discipline of Linux.
+
+The GPS receiver is then configured as a reference clock in ntpsec:
+
+```
+refclock nmea unit 0 mode 0x10 minpoll 4 maxpoll 4 path /dev/ttyS0 ppspath /dev/pps0 baud 9600 flag1 1 flag2 1 flag3 0 refid LIgp
+```
+
+
+## David
+![](/static/IMG_6045.jpg)
+
+Details on the setup of this machine are described here: [https://minimal-setups.de/blog/timeserver/](https://minimal-setups.de/blog/timeserver/).
+