[ANSS-netops] Reminder of Week Number Roll Over event on 29th May 2021 for old Guralp digitizers

Mon Mar 1 14:51:16 UTC 2021

Beware! For those still running DM24-type Guralp digitizers there may be a timing issue on May 30 2021 if the firmware is not upgraded or the GPS unit is not swapped.

-Patrick

________________________________
From: Güralp Support <support at guralp.com>
Sent: Monday, March 1, 2021 4:37 AM
Subject: [EXTERNAL] Reminder of Week Number Roll Over event on 29th May 2021

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This is to remind you of the GPS Week Number Roll Over (WNRO) event impacting Lassen iQ receivers on 29th May 2021.

Further to our email on the 8th January, this is a reminder that some of the older (white) GPS receivers we have supplied in the past will stop providing accurate dates after the 29th May, 2021 unless remedial action is taken in advance.

This WNRO event will affect Lassen iQ receivers which, on the 30th May 2021, will roll back to report a date of 14th December 2001.

You can use the guidance on www.guralp.com/howtos/gps-wnro<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMA%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DvDwyLGHm3bTtA7zSt5QT_g&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796417271%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=cqwSUfEPrcAVX5O%2FSGpkRqVM%2BtN0TkcbkuG0Dzj91dU%3D&reserved=0> to identify if you are using a Lassen iQ receiver

Options for remediation:
DM24 Digitisers
If you are using the Lassen iQ GPS receiver with a DM24 Mk3 digitiser, you can do one of the following:

  *   Update the digitiser with the WNRO firmware update for the Güralp DM24 Mk3 (this update will also address all future WNRO events including 2032 and 2038)
  *   Replace the GPS unit with a new unit that is unaffected by the WNRO problem
  *   Güralp can upgrade your receiver with a new PCB assembly. This will involve returning your receiver to the factory
  *   Your local distributor<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMQ%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9jb250YWN0L2Rpc3RyaWJ1dG9ycz9fY2xkZWU9WlhObGVXMXZkWEpBWjNWeVlXeHdMbU52YlElM2QlM2QmcmVjaXBpZW50aWQ9Y29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNyZlc2lkPTI5NTk1OTk1LWJlNTEtZWIxMS1hODEyLTAwMGQzYWQ2ODgzMg%26K%3DbP4zFQWY93m3u4IxDYyr5w&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796427223%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aPNfFijZTzwZxAs7sTbyZGJztohbejG9Tg3sn5NxQb4%3D&reserved=0> may be able to upgrade your receiver with a new PCB assembly. This will involve returning your receiver to your distributor. Please contact your distributor to see whether they offer this service
  *   You can purchase a "field upgrade kit" for your receiver, which will allow you to replace its existing PCB assembly with a new one which is immune to the WNRO problem

CD24 Digitisers
If you are using the Lassen iQ GPS receiver with a CD24 digitiser you must replace the GPS unit or upgrade the PCB assembly

Full details on all the options available can be viewed in the guidance here: www.guralp.com/howtos/gps-wnro<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMg%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DoAegRyFNAl2tpgU1eRrAHQ&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796437178%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aPm9iZqJ7gvuTSQaXtkOIEhyUOP%2Ff7JTXNvtWY5zkLQ%3D&reserved=0>

Previous WNRO event in 2019
You may recall that there was a similar issue with the WNRO event in 2019 which primarily effected a different model of GPS receiver (Lassen SQ), and which we communicated in some detail. It is therefore possible that you have already taken the necessary action to avoid the problems arising from the 2021 WNRO event, however, we strongly recommend that you review your equipment and firmware records to satisfy yourself that this is the case and that no further action is required.

Full guidance on the 29th May 2021 WNRO event and the remedial actions that should be taken can be found on our website including:

  *   Advice on how to identify if you have a lassen iQ receiver
  *   Methods for updating DM24 firmware
  *   Actions to take if purchasing new GPS units for CD24 digitisers

For more information read the full guidance here:
www.guralp.com/howtos/gps-wnro<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Felinkeu.clickdimensions.com%2Fc%2F6%2F%3FT%3DNzQ1NTk0NzA%3AcDEtYjIxMDA4LWI3ODZjM2ZiYjczMjRhODA5ZWI0ZjY2NTNmN2E4Mzdi%3AZXNleW1vdXJAZ3VyYWxwLmNvbQ%3AY29udGFjdC03NDgxNGM1MzcxZjllOTExYTgxMTAwMjI0ODAxYmM3Ny0xOWY5MjViNjk0Mzg0Y2MwOWE0ZTA1OTZkYWJlYTZmNw%3AZmFsc2U%3AMw%3A%3AaHR0cHM6Ly93d3cuZ3VyYWxwLmNvbS9ob3d0b3MvZ3BzLXducm8_X2NsZGVlPVpYTmxlVzF2ZFhKQVozVnlZV3h3TG1OdmJRJTNkJTNkJnJlY2lwaWVudGlkPWNvbnRhY3QtNzQ4MTRjNTM3MWY5ZTkxMWE4MTEwMDIyNDgwMWJjNzctMTlmOTI1YjY5NDM4NGNjMDlhNGUwNTk2ZGFiZWE2ZjcmZXNpZD0yOTU5NTk5NS1iZTUxLWViMTEtYTgxMi0wMDBkM2FkNjg4MzI%26K%3DeXug_jdnX53TEPdWY1Xqog&data=04%7C01%7Canss-netops%40geohazards.usgs.gov%7Ce24911ba64be4190e27c08d8dcc1778f%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502070796437178%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=PIKF0HSiFocfQ33Kr2t2d%2BzuFL28M8qn7s3rqEyrDKs%3D&reserved=0>

With best wishes,

The Güralp Team

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