MULTILANE AT4039EML User Manual page 21

User-defined Pattern
AT4039EML |User Manual
error detection on
custom defined
patterns.
The custom pattern is
made up of 2 fields with
16 hexadecimal
characters each. One
must fill out both fields
with all 32 hex
characters.
Every hex character is 4
bits wide, making up 2
PAM4 symbols; example
0xF is 1111 so in Gray-
coded PAM domain this
results in 22, assuming
the PAM levels are
denoted 0, 1, 2 and 3
Example 2: to transmit a
stair signal 0123, fill out
the fields with
repetitions of 1E
In the RX Pattern menu,
one can browse all the
patterns with which
error detection
possible. Note that TX
and RX pattern must be
the same to acquire RX
lock and consequently
be able to do
measurements. Also the
pattern polarity is very
important and makes all
the difference between
having RX PLL lock or no
lock at all. You can
ensure correct polarity
by connecting the TX-P
side of the cable to the
RX-P and the TX-N to the
RX-N. if you do not
respect this rule, you can
still invert polarity from
17|P a g e
is