GPS-synchronized products require you to install a view-of-the-sky antenna.
CDMA-synchronized products work great with the antenna inside your building, just like your cell phone.
EndRun Technologies is the only company in the world to design and manufacture Network Time Servers that use CDMA cell phone signals as a timing reference. These products started selling in 2001 and have been very popular. But now, 20 years later, the CDMA cell phone system is near its end-of-life in the U.S. It has already been completely discontinued in most parts of the world. Therefore, we announced the phase-out of our Sonoma CDMA Network Time Server in December 2020.
CDMA service in the United States is currently provided by Sprint and Verizon. As of August 2019, Sprint has merged with T-Mobile and has not announced any forthcoming changes to their CDMA network. Verizon plans to discontinue CDMA cell phone service by the end of 2020 but continue service for its M2M partners through the end of 2022 with a thinner level of coverage.
CDMA-based network time servers acquire a UTC time sync from signals broadcast from a CDMA base station. The Verizon signal is acquired via the North American Cellular (NAC) channel set and Sprint via the North American PCS (NAP) channel set. If a CDMA base station is operational for phone service or M2M communications, it will broadcast the time and sync signals required by EndRun's CDMA network time servers. The factory default channel set today in EndRun products is NAP due to the anticipated longevity advantage of Sprint's CDMA network .
Sprint's 2014 Network Vision project completely upgraded 38,000 cell sites with plans to maintain its CDMA network for the long term. We are unaware of any statements from Sprint since then regarding the future of CDMA but we are anticipating service to be available through at least 2022. We have had unconfirmed reports that Sprint is contemplating discontinuance of CDMA in 2023 time frame.
In July 2019 Verizon spokesperson Howie Waterman confirmed to Light Reading that Verizon has pushed out the discontinuance date for CDMA cell phone service from December 2019 to December 31, 2020. Some major M2M vendors that are in the Verizon Partner program have also announced that Verizon will continue CDMA service to their systems through 2022. Network coverage could change post-2020, however, as some CDMA spectrum is re-farmed for LTE and 5G.
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