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BERT Setup - Data selection - (Layer 1 Unframed)
Layer 1 Unframed Test Patterns
HFPAT (High Frequency Pattern):
This test pattern is to test random jitter (RJ) at a BER of 10-12, and also
to test the asymmetry of transition times. This high frequency test pattern generates a one, or light on, for a
duration of 1 bit time, followed by a zero, or light off, for a duration of 1 bit time. This pattern can be
generated by the repeated transmission of the D21.5 code-group. Disparity rules are followed.
LFPAT (Low Frequency Pattern):
The intent of this test pattern is to test low frequency RJ and also to test
PLL tracking error. This low frequency test pattern generates a one, or light on, for a duration of 5 bit times,
followed by a zero, or light off, for a duration of 5 bit times. This pattern can be generated by the repeated
transmission of the K28.7 code-group. Disparity rules are followed.
MFPAT (Mixed Frequency Pattern):
The intent of this test pattern is to test the combination of RJ and
deterministic jitter (DJ). This mixed frequency test pattern generates a one, or light on, for a duration of 5 bit
times, followed by a zero, or light off, for a duration of 1 bit times, followed by a one for 1 bit time followed by
a zero for 1 bit time followed by a one for 2 bit times followed by a zero for 5 bit times followed by a one for
1 bit time followed by a zero for 1 bit time followed by a one for 1 bit time followed by a zero for 2 bit times.
This pattern can be generated by the repeated transmission of the K28.5 code-group. Disparity rules are
followed.
RDPAT (Random Data Pattern):
Designed to provide energy across the entire frequency spectrum providing
good simple BER testing.
JTPAT (Jitter Tolerance Pattern):
Designed to verify jitter tolerance on the receivers by exposing a
TX300/e_e-manual_D07-00-033P_RevG00
Содержание VePAL TX300
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