The pattern menu can be accessed by pressing the Pattern main menu key on the bottom. It includes 12 defined patterns. Up to six user‑defined patterns can be created by pressing the Set User Pattern submenu key.
• 1,048,575‑bit pattern. An output bit is forced to one whenever the previous 14 bits are zero.
• Simulates live traffic including both high‑density and low‑density sequences.
PRBS-9
• 511- bit pseudo-random pattern.
PRBS-11
• 2047-bit pseudo-random pattern.
PRBS‑15
• 32,767‑bit pseudo‑random pattern.
• Tests to CCITT recommendations O.151 and G.703. Provides maximum number of zeros for testing non‑HDB3 circuits.
PRBS‑20
• 1,048,575‑bit pseudo‑random pattern.
PRBS‑23
8,388,607‑bit pseudo‑random pattern.
1 IN 8 (also known as 1 in 7)
• 8‑bit pattern of a 1 and 7 zeros.
• Checks clock recovery on circuits optioned for HDB3.
2 IN 8
• 8‑bit pattern of 2 ones and 6 zeros.
• Used to determine correct optioning of AMI or HDB3 line coding.
3 IN 24
• 24‑bit pattern with 3 ones and also with 15 consecutive zeros. 12.5% ones density.
• Stresses AMI optioned circuits for minimum ones density and maximum consecutive zeros performance. Forces zero substitutions in HDB3 optioned circuits.
ALL ONES
• All ones sent as payload in a framed sequence.
• Stresses ability of circuit to operate under maximum power conditions.
ALL ZEROS
• All zeros sent as payload in a framed sequence.
• Checks for HDB3 optioning. Circuit will drop if optioned for AMI.
User Defined Patterns
• Custom user‑defined patterns can be created by pressing the Set User Pattern submenu key .
