Important Notice: Firmware Fault in GPS183 and GNS183-UC-Based Clocks

We have identified a critical firmware fault in our GPS183 and GNS183-UC-based reference clocks. This fault will only occur as a result of a short-circuit on the antenna line and can result in permanent damage to the receiver. However, it should not occur in any system with a correctly functioning antenna/receiver combination.

This fault affects not only the IMS modules (IMS-GPS183 and IMS-GNS183-UC) installed in modular IMS LANTIME systems but also any other Meinberg device in which these reference clock types are used.

The full list is as follows:

• IMS-GPS183 and IMS-GNS183-UC Reference Clock Modules
• LANTIME M150/GPS, M150/GNS-UC, M250/GPS, M250/GNS-UC, M320/GPS, M320/GNS-UC, M450/GPS, and M450/GNS-UC Time Servers
• microSync HR101, HR102, HR301, HR302, RX101, RX102, RX201, RX202, RX301, RX302, RX311, RX312, RX401, RX402, RX411, RX412 Time Servers

In a very small number of cases, the following devices may also be affected.

• LANTIME M100/GPS, LANTIME M100/GNS-UC, LANTIME M200/GPS, LANTIME M200/GNS-UC, LANTIME M300/GPS, LANTIME M300/GNS-UC, LANTIME M400/GPS, LANTIME M400/GNS-UC Time Servers

Not all devices listed above are affected by this fault. To identify whether your device is at risk, visit the Meinberg Customer Portal and enter your device's serial number. You will be notified there if your device is one of those at risk.

You can also verify for yourself whether your Meinberg product is affected by this fault:

• If you have an IMS LANTIME system with an IMS-GPS183 or IMS-GNS183-UC reference clock installed, you can use the Web Interface to check which firmware version is installed. Open the "Clock" tab, expand the "Information" panel, then select the "Common Information" tab. The "Software Revision" entry should read at least "v1.12". If you have an older version, your device is at risk and you will need to install the provided firmware update.
• If you have a LANTIME M100, M150, M200, M250, M300, M320, M400, or M450 system with a GPS or GNS-UC reference clock, you can use the Web Interface to check which exact model of reference clock is installed. Open the "Clock" tab, expand the "Information" panel, then select the "Common Information" tab. If the "Model" entry reads "GPS183" or "GNS183-UC" and the "Software Revision" entry is not at least "v1.12", your device is at risk and you will need to install the provided firmware update. Note that a LANTIME M100, M200, M300, or M400 will only ever have a GPS183 or GNS183-UC in very rare and specific circumstances.
• If you have one of the microSync systems in the list above, you can use the Web Interface to check which exact model of reference clock and firmware version is installed. Open the "Maintenance" tab, select the "Modules" page, and expand the clock module panel. If the panel itself reads "GPS183" or "GNS183-UC" and the "Version (legacy)" entry under "Firmware" is not at least "1.11", your device is at risk and you will need to install the provided meinbergOS update.

Please note that this fault only affects the newer GPS183 and GNS183-UC reference clocks. It does not affect the GNS183, GXL183, or older reference clocks such as the GPS182, nor does it affect microSync devices other than those listed above.

For more information on identifying affected LANTIME OS-based devices and the download and installation of the module firmware under LANTIME OS, download this PDF guide.

For more information on identifying affected meinbergOS-based devices (e.g., microSync) and the download and installation of the module firmware under meinbergOS, download this PDF guide.

If you have any questions about this fault or updating your Meinberg product, please contact the Meinberg Technical Support team.