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CDMA also has unique timing issues. In order for any direct-sequence
spread-spectrum radio system to operate, all mobiles
and base stations must be precisely synchronized. If they are not
synchronized, it becomes nearly impossible to recover the codes
used to identify individual radio signals. In the IS-95 system,
synchronization is based on the Global Positioning Satellite (GPS)
system time. Each CDMA base station incorporates a GPS receiver
to provide exact system timing information for the cell. The base
station sends this information to each mobile via a dedicated coded
channel. In this manner, all radios in the system can maintain
near-perfect synchronization.
This precise synchronization may be part of the manufacturing
test procedure. If it is, there will be an impact on the test equipment
interface. In this case, in addition to a “house frequency
standard,” there will be a “house timing standard,” also called the
“even-second clock.” The availability of an even-second clock to
the base station and test equipment speeds up some measurements,
reducing test time.
Manufacturers must also be able to control the base station for
testing purposes. The interface that controls the base station is
often NEM proprietary, which requires the NEMs to have the programming
skill, or to work closely with a test equipment manufacturer
to provide internal control of the test instruments. In design
and manufacturing, this backbone control is often done using a
Base Station Control (BSC) simulator. In installation and maintenance,
where a test set is typically the instrument of choice, the
test set can provide some of this control
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