02-04-2015, 06:17 AM
hi there, I studied IRSE news issue 147 july/august in that it had been given about EBI TRACK 200,300,400. I understood about EBI track 200 and 300. But it is difficult to understand about EBI Track 400 given in that can anyone explain about this content
"A prime development exercise related
to the size of the code word so that
wrong-side failure integrity could be
mathematically proven. The choice of a
256 bit telegram in turn dictated a bit rate
of 128 bits per second which the
communication channel would have to
support given that code recognition was
required within two seconds to stay close
to the tried and tested performance
parameters of the previous TI21 track
circuit. The 256 bit code word has meant
that by optimising the hamming distance
between code words to cover both
wrong-side and right-side failure
conditions at least 16 000 exceptionally
safe unique codes per carrier frequency
can be generated."
given in page 7 of that news letter
Thanks in advance
"A prime development exercise related
to the size of the code word so that
wrong-side failure integrity could be
mathematically proven. The choice of a
256 bit telegram in turn dictated a bit rate
of 128 bits per second which the
communication channel would have to
support given that code recognition was
required within two seconds to stay close
to the tried and tested performance
parameters of the previous TI21 track
circuit. The 256 bit code word has meant
that by optimising the hamming distance
between code words to cover both
wrong-side and right-side failure
conditions at least 16 000 exceptionally
safe unique codes per carrier frequency
can be generated."
given in page 7 of that news letter
Thanks in advance