BERT

Bit error rate testers (BERTs) are usually the initial step for communications testing. These instruments generate digital test patterns, typically pseudorandom binary sequences (PRBSs), that drive devices under test (DUTs). Following the transmission of the signal through the link, the receiver in the BERT captures the signal. This setup can be used for multiple testing purposes, such as to evaluate the performance of a transmitter, a receiver, or an optical link.

MultiLane supports general-purpose BERTs that connect through fixtures and coax cables, as well as BERTs that present an MSA-compliant standard interface.

A BERT needs to be tailored to the characteristics of the DUT. Key parameters include:

  • Baud rate
  • Number of channels
  • Modulation format (e.g. NRZ, PAM4, etc.)
  • Test pattern (e.g. PRBS15 )
  • Signal amplitude
  • Port type (e.g. QSFP-DD)
  • Form factor (e.g. portable, chassis, etc.)
Part number Max baud rate (GBd) Channels Pattern length Data format Amplitude max (mVpp diff.) Other
ML4039-BTP 30 4 up to PRBS31 NRZ 800 Benchtop
ML4039B Gen2-BTP 1.25 - 28 4 up to PRBS(Q)31 PAM4/NRZ 800 Benchtop
ML4039B-JIT Gen2 30 4 up to PRBS31 NRZ 2200+ Jitter Impairments, benchtop
ML4039D 29.5 4 up to PRBS31Q PAM4/NRZ 1500 Benchtop
ML4039E 56 4 up to PRBS31, PRBS13Q, SSPRQ PAM4/NRZ 800 Benchtop
ML4039EN 56 4 up to PRBS31, PRBS13Q, SSPRQ PAM4/NRZ 800 Benchtop, crosstalk noise injection
ML4039EML 56 4 up to PRBS31, PRBS13Q, SSPRQ PAM4/NRZ 1800 Benchtop, single-ended EML drive
ML4079 30 8 Up to PRBS 31 NRZ 800 Benchtop
ML4079D 29.5 8 Up to PRBS 31, PRBS13Q, SSPRQ PAM4/NRZ 1500 Benchtop
ML4079E 58 8 PRBS13Q, 31Q and SSPRQ PAM4/NRZ 800 Benchtop
ML4079EN 58 8 PRBS13Q, 31Q and SSPRQ PAM4/NRZ 800 Benchtop
Part number Max baud rate (GBd) Channels Pattern length Data format Amplitude max (mVpp diff.) Other
ML4070-SFP 30 3x1 PRBS 7, 9, 15, 23, 31 NRZ 800 Margin tester, benchtop, SFP format
ML4070-QSFP 30 3x4 PRBS 7, 9, 15, 23, 31 NRZ 800 Margin tester, benchtop, QSFP format
ML4070-QDD 28 3x8 NRZ: up to PRBS31 PAM4: up to PRBSQ31 PAM4/NRZ 800 Margin tester, benchtop, QSFP-DD format
ML4070-OSFP 28 3x8 NRZ: up to PRBS31 PAM4: up to PRBSQ31 PAM4/NRZ 800 Margin tester, benchtop, OSFP format
Part number Max baud rate (GBd) Channels Pattern length Data format Amplitude max (mVpp diff.) Other
ML4054-400-BTP 29 8 Up to PRBS31(Q) PAM4/NRZ 800 Manufacturing, benchtop, CFP8 format
ML4054-400-LP 29 8 Up to PRBS31(Q) PAM4/NRZ 800 Low profile version for thermal testing
Part number Max baud rate (GBd) Channels Pattern length Data format Amplitude max (mVpp diff.) Other
ML407-PAM 56 1 Up to PRBS31(Q) PAM4/NRZ 1000 JTOL clock source to be used with ML4039/ 4079 BERTs, benchtop