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, Hong Kong, India, Japan and 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.  You can also check the worldwide coverage map at  Any area listed on the charts with "Type of System" shown as 800 MHz or 1900 MHz will probably work with our products.  (If the "Technology" column shows LTE, this will NOT work with our products.)

How long will CDMA be Around (USA)?
We expect Verizon to provide CDMA service until 2020.  We expect Sprint to provide CDMA service through 2020 and beyond.  Sprint CDMA coverage is extensive nationwide.  For a Sprint Voice coverage map click here.  For background and details, read the following:

CDMA service in the United States depends on the CDMA networks operated by Sprint and Verizon.  As of April 2017, Sprint has made no announcements to discontinue operation of their CDMA network.  Verizon announced in February 2016 that they intend to discontinue CDMA service by 2020 to reuse the spectrum.  Therefore we expect CDMA service to be available from both providers to at least 2020 and most likely beyond by at least Sprint.

Sprint:  Sprint completed a large investment in their Network Vision project in 2014 that completely upgraded the network infrastructure at 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.  Sprint is also focused on the M2M market and is supporting the migration of many 2G GSM customers to their CDMA network.  "Now is the opportune time for any customers migrating off GSM or designing new products for telematics, telemetry, automotive and security applications to take advantage of Sprint's 2G platform", said Wayne Ward, vice president of Sprint's M2M Group, in May 2013.

Verizon:  In July 2016, Jeff Hamby, Verizon spokesman, stated that Verizon has set a goal to discontinue operations of it's CDMA 1X network by December 31, 2019.  However, Verizon is aware of the millions of CDMA based machine-to-machine (M2M) and Internet-of-Things devices that will need to transition to LTE.  Therefore Verizon has signaled that they "will work with these customers one-on-one" to transition and will consider operating the CDMA network into 2020 if necessary.  M2M includes communications for alarm systems, industrial equipment, vending machines, power company meters, and other "smart" equipment.
Reference articles:
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
Telit:  Sprint Selects Telit as a Preferred Provider and Approves CDMA 1xRTT M2M Module
Fierce Wireless:  Verizon to shut down 2G CDMA 1x network by the end of 2019

Time Server with Indoor Antenna

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