The object used for configuring the user defined pattern
for BERT. This is the fixed repeating BERT pattern sent
and expected to be received when the cbTestPattern object is
set to 'userPattern'. The maximum length of this pattern
is 32 bits. Depending on the hardware, the patterns are
transmitted with least significant first or most
significant bit, until pattern length is reached.
This object can not be modified when the BERT is running,
i.e cbRowStatus is active(1).