GPS vs. CDMA

Our products use two different sources as their timing reference - either GPS or CDMA (indirect GPS).  Following are differences between the two methods:

GPS
CDMA
GPS Antenna Kit CDMA Uses Indoor Antenna
This GPS Antenna Kit is included with each Time Server.  The standard kit has 50 ft. (15 m) of antenna cable.
The magnetic-mount CDMA antenna is included with each Time Server.  It has 12 ft (3.6m) of cable.
GPS antenna requires view-of-the-sky with roof or window-mount.  Expensive installation and maintenance costs are often required.
CDMA antenna works indoors!  You can simply place the antenna on top of your equipment rack inside your data center.
Worldwide coverage.
Localized coverage: USA, China, Korea, India, Japan and elsewhere.
NTP network timing accuracy 1/2 - 2 milliseconds, typical.
NTP network timing accuracy is 1/2 - 2 milliseconds, typical.  (Same as GPS.)
Absolute timing accuracy of unit is under 30 nanoseconds.  For NTP, the network timing accuracy (see above) is more important.
Absolute timing accuracy of unit is typically under 10 microseconds.  For NTP, the network timing accuracy (see above) is more important.
Global Positioning System (GPS) is a 32-satellite constellation owned and operated by the United States Government as a national resource.
CDMA cellular/PCS mobile telecommunications network via countless CDMA system base stations scattered throughout the world.  Maintained by commercial cell phone system providers.  CDMA system timing accuracy is guaranteed to be within 10 microseconds in order for the cell phone system to work.



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