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
receiver's CDR to large instantaneous phase jumps. The pattern alternates repeating low transition density
patterns with repeating high transition density patterns.
SNPAT (Supply Noise Pattern):
Designed to simulate the worst case power supply noise that could be
introduced by a transceiver.
Layer 2, 3, & 4 test patterns
PRBS:
2^31 -1 (147 483 647-bit pattern used for special measurement tasks, [e.g., delay measurements at
higher bit rates])
2^23 -1 (8 388 607 bit pattern primarily intended for error and jitter measurements at bit rates of 34
368 and 139 264 kbps)
2^15 -1 (32 767 bit pattern primarily intended for error and jitter measurements at bit rates of 1544,
2048, 6312, 8448, 32 064 and 44 736 kbps)
2^11 -1 (2047 bit pattern primarily intended for error and jitter measurements on circuits operating at
bit rates of 64 kbps and N x 64 kbps)
Fixed:
All 0s or All 1s
User Defined pattern:
Length depends on size of frame
Inversion:
Normal or inverted
BERT Setup - Data selection - PRBS Patterns (Page 1)
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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