CDMA Timing
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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.)
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| 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., Brazil, Canada, China, Hong Kong, India, Japan, Korea and elsewhere.
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, or check the worldwide coverage map at www.cdg.org.
How long will CDMA be Around?
In the U.S.A., Verizon is the primary carrier for CDMA. Verizon is moving to LTE but it will take time and the
older CDMA network is likely to be around for many more years. In 2009, Verizon's CTO Tony Melone said that
Verizon Wireless would continue to rely on its CDMA 1x network for voice traffic during its LTE rollout, noting
that the technology is well-designed for voice communications. Also that Verizon Wireless would support
its CDMA 1x network at least through 2018 to 2020.
In another statement he said that he would not be surprised to see the CDMA-1x network still in place in 2020. Click
here
for full article.
In 2011 Verizon rolled out their CDMA version of the iPhone. Click
here for
press release. This further shows Verizon's committment to keeping CDMA around for the foreseeable future.
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