FC-1 Payload (test pattern)
Layer 1 test patterns are formatted using the 8B/10B symbol format and include the PCS layer as part of the BER pattern.
CRPAT, CSPAT, and CJTPAT test patterns according to NCITS-TR-25-1999 and MJSQ, are designed to evaluate frequency
fluctuations, transceiver noise and phase jumps caused by jitter and other anomalies. These test patterns are described briefly as
follows:
CSPAT:
Compliant Supply Noise Pattern
Represents worst case power supply noise
CRPAT:
Compliant Random Pattern
Provides broad spectral content and minimal peaking for the measurement of jitter at component or system level
CJTPAT:
Compliant Jitter Test Pattern
Jitter Tolerance Pattern that stresses a receiver by exposing it to extreme phase jumps thereby stressing the clock data
recovery (CDR) circuitry
The pattern alternates between repeating low transition density patterns and repeating high transition density patterns
FC-1 BERT - Payload Setup
FC-1 Test Patterns
CRPAT sequence is offered for TX jitter measurements.
CRPAT and CJTPAT are available for RX jitter tolerance measurements - use these test patterns to
test the resilience of the receiver (Clock Data Recovery - CDR) and its tolerance to signals with
jitter.
FC-2 Payload (test patterns)
Layer 2 "Compliant" test patterns are modified to resemble a true Fiber Channel frame - the pattern's format is similar to a basic frame
which includes a Start of Frame Delimiter (SFD), End of Frame Delimiter (EFD), and Cyclic Redundancy Check (CRC).
Pseudo Random Bit Sequences (PRBS)
are commonly used to test the signal integrity of high-speed links and are defined in ITU-T
0.150 & 0.151 Recommendations – These legacy SONET/SDH/PDH test sequences may appear random but they have specific
properties that can be used to measure the quality of a link. PRBS patterns can be normal or can be inverted.
2E31-1:
147 483 647-bit pattern used for special measurement tasks, (e.g., delay measurements at higher bit rates)
2E23-1:
8 388 607 bit pattern primarily intended for error and jitter measurements at bit rates of 34 368 and 139 264 kbps
2E15-1:
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
2E11-1:
2047 bit pattern primarily intended for error and jitter measurements on circuits operating at bit rates of 64 kbps and N
x 64 kbps
FC-2 BERT - Payload Setup
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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