Upgrade Your Meridian II Precision TimeBase
Free Software Upgrades
We provide free software upgrades for our products. The software available on this page is for the Meridian II. Here are the latest binary image files:
Linux Subsystem (Root File System)
Download 6010-0067-000 v4.02
WARNING: Some browsers will automatically unzip this file. After you have downloaded, make sure the size is < 40M.
MD5 Checksum: 548d1e60907c871e827a38dc373491ef
Click here to see list of changes.
Linux Subsystem (Kernel)
Download 6010-0064-000 v2.01
MD5 Checksum: f2624e59fec5a9da0f7af4dadb321cf3
Click here to see list of changes.
GPS Subsystem
Download 6010-0076-000 v4.01
MD5 Checksum: 003bc2851883385448042e894ba22126
Click here to see list of changes.
GPS Receiver
Download 6010-0081-000 v1.31
MD5 Checksum: 0857431cdd3fde3cc38620b5c115a867
Click here to see list of changes.
Upgrade Instructions
For complete instructions, please refer to "Appendix B - Upgrading the Firmware" of your User Manual. If you want to download the latest manual click here for the Meridian II User Manual.
If you have any questions or problems with the upgrade please contact customer support by email (support@endruntechnologies.com) or phone (1-877-749-3878 or 1-707-573-8633).
History of Software Changes
Linux Subsystem (Root File System) — Software Part Number 6010-0067-000
| Version | Date | Changes |
| 4.02 | 1/2026 | Changes include: RECOMMENDATION: Please upgrade. |
| 4.01 | 9/2021 | Changes include: 1. Fixed bug when updating the kernel via the HTTP interface. 2. Included updated User Manual to reflect recent changes. 3. Added SyncE protocol. RECOMMENDATION: No need to update. |
| 4.00 | 6/2021 | Changes include: 1. Updated entire file system to Slackware 14.2 which contains new versions for: OpenSSL 1.0.2u OpenSSH 7.4p1 NTP 4.2.8p15 2. Updated Apache (httpd) to 2.4.46. 3. Removed PHP libraries and converted PHP to CGI. 4. Updated SNMP with support for SNMP V3 traps. Note: NET-SNMP 5.5.1 and PTP 2.2.2 remain the same versions as before. RECOMMENDATION: Please upgrade. You must also upgrade the GPS Subsystem. |
| 3.04 | 9/2019 | Changes include: 1. Added handling of new GPS Subsystem log messages (see version 3.04 of the GPS Subsystem). 2. Added support for new rubidium oscillator type. RECOMMENDATION: Please upgrade. |
| 3.01 | 11/2018 | Changes include: 1. Added support for 2U version of Meridian II. 2. Added Hybrid Mode to the Precision Time Protocol (PTP) option. 3. Fixed rare SNMP bug when querying the fault status bytes. RECOMMENDATION: No need to upgrade unless you use SNMP or want the PTP Hybrid Mode. If you choose to upgrade then you must also upgrade the GPS Subsystem. |
| 2.40 | 9/2017 | Changes include: 1. Calculation of NTP refclock peer dispersion reverted to that of NTP versions 4.2.2 and earlier. This improves compatibility in installations operating mixtures of old and new Stratum 1 NTP servers. 2. Added missing shared library required by ntp-keygen binary. 3. Added RINEX observations logging for Precise Point Positioning (PPP) and HP5071A cesium control. RECOMMENDATION: No need to upgrade unless you use ntp-keygen. |
| 2.20 | 6/2017 | Changes include: 1. Added support for new products RTM3205 and 2U version of Meridian II. 2. Very minor bug fixes for users who have customized their /etc/profile or /etc/rc.d/rc.M file. New environment variables were not being set after firmware upgrades. RECOMMENDATION: No need to upgrade. |
| 2.12 | 12/2016 | Changes include: 1. Updated NTP to version 4.2.8p9 due to recently-discovered vulnerabilities. For more information see Network Security Bulletin NSB161205. For additional security recommendations, see Best Practices to Secure Your Time Server. 2. Added two new commands for restoring operation after using a GPS simulator. You should execute "resetlastgpswn" and "resetleaphistory" to restore these settings to factory defaults after you've used a GPS simulator. If you require this functionality then you must also upgrade your GPS Subsystem to version 2.03 (or later) and your GPS receiver to version 1.11 (or later). RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 2.11 | 10/2016 | Changes include: 1. Updated NTP to version 4.2.8p8. 2. Added new command ("installed_sw_opts") to show a list of installed software options (if any). 3. Inhibited excessive SNMP logging to system logs. 4. PTP Option: Changed TFOM level used to indicate GPS locked status from 3 to 4. This prevents the PTP Time Source from bouncing between GPS and OSC. 5. PTP Option: Reduced PTP logging when Port State is passive. 6. Added support for the Real-Time Ionospheric Corrections (RTIC) Option. RECOMMENDATION: Please upgrade. |
| 2.01 | 05/2016 | Changes include: 1. Added more logging information for PTP option. 2. Enabled operation of Linux binaries: tcpdump, ping6, udevd, udevadm, dig and lsusb. 3. Commands added to provide detailed GPS information: dumpalmanac, dumpephemeris, gpsionoinfo. 4. Command added: clearalmanac. 5. Command added to provide serial number of GPS receiver: rcvrserialnumber. RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 2.00 | 8/2015 | Initial release. |
Linux Subsystem (Kernel) — Software Part Number 6010-0064-000
| Version | Date | Changes |
| 2.01 | 11/2016 | Applied patch to neutralize the "COW" vulnerability. This vulnerability allowed privilege escalation of existing users having shell access to the system. RECOMMENDATION: Please upgrade. |
| 2.00 | 9/2016 | Added Advanced Routing and Net Filtering capabilities to support advanced handling of the two network interfaces. These features may be accessed using the iproute2 utilities provided by the ip binary. RECOMMENDATION: No need to upgrade unless you want to use this advanced feature. |
| 1.01 | 8/2015 | Initial release. |
GPS Subsystem — Software Part Number 6010-0076-000
| Version | Date | Changes |
| 4.01 | 2/2023 | Minor changes related to Cesium Control Option Module. RECOMMENDATION: No need to upgrade. |
| 4.00 | 6/2021 | No functional changes. Version changed to 4.00 to maintain compatibility with the 4.00 Linux Root File System. RECOMMENDATION: If you upgrade the Linux Root File System then you must upgrade the GPS Subsystem. |
| 3.07 | 9/2020 | Changes include: 1. Fixed bug that caused an inability for the unit to lock in some situations - sometimes when in dynamic mode and sometimes when in interference environments. 2. Fixed bug when the unit was locked to GPS and in dynamic mode and sometimes there was a receiver state nuisance indication (locking-locked-locking). RECOMMENDATION: Please upgrade at your next maintenance opportunity. |
| 3.06 | 8/2020 | Fixed small bugs in the IRIG-B120 output having to do with the IEEE-1344 Leap Second Pending bit and the Time Quality bits. RECOMMENDATION: No need to upgrade. |
| 3.05 | 12/2019 | Changes include: 1. Fixed nuisance reporting bug when unit is in Stratum 2 operation, with unknown position mode and no antenna connected. 2. Fixed rare bug where GPS receiver is unable to move from LOCKING to LOCKED. RECOMMENDATION: Please upgrade at your next maintenance opportunity. |
| 3.04 | 9/2019 | Changes include: 1. Improved hardening against, and logging of, anomalous GPS system events. 2. Added support for new rubidium oscillator type. RECOMMENDATION: Please upgrade. |
| 3.00 | 9/2018 | Added support for 2U chassis. RECOMMENDATION: If you upgrade the Linux Root File System then you must upgrade the GPS Subsystem. |
| 2.40 | 12/2017 | Added RINEX observations logging for Precise Point Positioning (PPP) and HP5071A cesium control. RECOMMENDATION: No need to upgrade. |
| 2.20 | 4/2017 | Improved internal consistency checking on GPS information to reduce occurrence of nuisance alarms. RECOMMENDATION: Please upgrade. |
| 2.04 | 1/2017 | Added support for two new products: RTM3205 and Meridian II 2U chassis. RECOMMENDATION: No need to upgrade. |
| 2.03 | 12/2016 | Changes include: 1. Fixed bug related to receiving GPS UTC info under certain conditions. 2. Improved oscillator control while resynchronizing after a signal outage. 3. Added two new commands for restoring operation after using a GPS simulator. RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 2.02 | 9/2016 | Changes include: 1. Reduced false alarms that may occur when GPS antenna is subject to interference or is located in a weak signal area. 2. Bug corrected that prevents leap second from occurring if unit is not receiving a GPS signal at UTC midnight on the day of the leap. 3. Added support for Real-Time Ionospheric Corrections (RTIC) Option. RECOMMENDATION: Please upgrade. |
| 2.01 | 5/2016 | Increased integrity checking of leap second, UTC and ionosphere model data received from GPS almanac transmissions. This will help protect Meridian II from problems that may occur due to GPS system errors or spoofing. If data is received that fails the integrity checks it is saved in a system log file. RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 2.00 | 8/2015 | Initial release. |
GPS Receiver — Software Part Number 6010-0081-000
| Version | Date | Changes |
| 1.31 | 12/2023 | Increased some data rejection thresholds due to excessive triggering from the increasingly active ionosphere as the peak of the solar cycle approaches. Some customers who monitor very closely see the receiver drop back to the Acquire state for about three minutes. These events do not cause disruption to the time and frequency outputs and are therefore considered "nuisance" alarms. The latitude at which the receiver is operating influences the likelihood of seeing these events, with equatorial regions being most active. RECOMMENDATION: Upgrade if you are experiencing these "nuisance" alarms. |
| 1.30 | 10/2019 | Improved hardening against, and logging of, anomalous GPS system events. RECOMMENDATION: Please upgrade. |
| 1.20 | 6/2017 | Improved GPS signal interference rejection. RECOMMENDATION: Please upgrade. |
| 1.11 | 12/2016 | Changes include: 1. Subtle improvement in handling of GPS Iono model updates. 2. Improved behavior in installations with poor satellite visibility. 3. Added two new commands for restoring operation after using a GPS simulator. RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 1.10 | 9/2016 | Added support for Real-Time Ionospheric Corrections (RTIC) Option. RECOMMENDATION: Please upgrade. |
| 1.02 | 5/2016 | Changes include: 1. Fixed inability to come out of position unknown mode after unit has been moved a very long distance. 2. Increased integrity checking of leap second, UTC and ionosphere model data received from GPS almanac transmissions. This will help protect Meridian II from problems that may occur due to GPS system errors or spoofing. If data is received that fails the integrity checks it is saved in a system log file. RECOMMENDATION: Please upgrade the Linux Subsystem (RFS), the GPS Subsystem and the GPS Receiver. |
| 1.01 | 8/2015 | Initial release. |
