-- Test Center Showcase
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C) "TEST FRAME"
FOR IrDA BIT-ERROR-RATE TEST: WHY DO WE NEED IT?
Most of the hardware components such as the IR
transceiver, the encoder/
decoder or the integrated IrDA I/O chip are often tested by the
component
manufacturer to be IrDA compliant. Each software layer of course can
also
be individually tested to be IrDA compliant. However, when all these
IrDA
compliant components are put together, unexpected result may happen.
Once the engineering phase is done and manufacturing phase starts,
there
are many possibilities at the assembly line too. Also, after the
manuf.
phase is done and the products are shipped, there remains the
field
service issue of screening test in the field or at service centers.
Methods for system testing must be planned and designed into the
IrDA
implementation, not an afterthought. A good system test methodology
is
essential to facilitate both engineering, the production and field
service.
Most of engineering mishaps usually are "in the area between
the Physical
Layer and IrLAP". Production mishaps usually are "confined
to Physical
Layer only". Consequently, a very simple and effective system
test is
to access the optional test frame feature of IrLAP, particularly
the
test frame feature within a connection.
The test frame feature is very simple to implement in the device
under
test. This can usually be accomplished by "adding only 6 lines
of C
codes! (attached here)". If implemented, a specially programmed
tester
tool can fully exercise the Physical Layer and IrLAP layer in
the
device under test (DUT) automatically. This test can range from
very
thorough for engineering study or QC diagnosis to very speedy
for
production, quality control or field screening. Both fashions
are
especially useful for Inter-op test among different IrDA device
classes.
Anybody who can implement IrDA stack can write it in 10
seconds!
For such little effort and no overhead, one can enable such
effective
and convenient testing in the phases following the engineering
implementation. We therefore, recommend that the Test Frame in
the
IrLAP layer to be mandatory.
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