Network Time Servers
CDMA Timing
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. (No subscriber fees required.)

CDMA Cell Phone Tower
CDMA cell phone towers transmit the timing signal. No subscriber fees to receive this signal.

Why Use CDMA?
The vast majority of precise timing products use GPS as their timing source.  These products require an antenna installed with a large view-of-the-sky.  Installing and maintaining the antenna can range from being merely a nuisance to being impossible.  In many downtown locations running a cable to the roof can cost several thousands of dollars and leasing rooftop space can cost hundreds of dollars a month.

How Is CDMA Used For Timing?
Our products harness the accuracy of GPS via CDMA signals used by digital cellular/PCS telephones.  Each CDMA base station has at least one GPS receiver because its' transmissions must be precisely synchronized within ten microseconds in order for the cell phone system to work properly.  Our products synchronize themselves to the CDMA base station transmissions, which means they are also synchronized to the GPS transmissions.  So, in effect, CDMA base stations act as GPS repeaters for precise timing applications. That's why we sometimes call it "Indirect GPS".

Where Are CDMA Signals Available?
These very reliable signals are easily received inside buildings and are extensively available throughout the U.S.A., China, Japan and South Korea.  If you are located in one of these areas then chances are good that you have CDMA cellular/PCS coverage.  If in doubt contact us.

How long will CDMA be Around (USA)?
CDMA service in the United States depends on networks operated by Sprint and Verizon.  We expect Verizon to provide service through the end of 2019.  Afterwards, Sprint will be the sole provider of CDMA service in the U.S.  Sprint CDMA coverage is extensive nationwide.  For a Sprint coverage map click here.

Sprint:  In 2014 Sprint completed a large investment in its Network Vision project that completely upgraded 38,000 cell sites throughout the U.S.  Sprint has said that it plans to maintain its 2G CDMA network capability for the long term as part of its overall Network Vision strategy.  This includes support for the M2M market (alarm systems, industrial equipment, telematics, power company meters, etc).  As of December 2017, Sprint has made no announcement about discontinuing its CDMA network.

Verizon:  In July 2016, Verizon announced a goal to discontinue operations of its CDMA network by December 31, 2019.  Therefore, we expect Verizon to gradually shut down CDMA service around the country starting sometime in 2019.

Reference articles:
Fierce Wireless:  Verizon to shut down 2G CDMA 1x network by the end of 2019
Geotab:  What You Need to Know About the 2G Shutdown
Telecom Engine:  Sprint to Continue Supporting 2G for M2M Customers
Sprint:  Sprint Selects u-blox as a Preferred Provider for Long-term CDMA Network Support
Time Server with Indoor Antenna

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