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 1.25 - 29 4 up to PRBS(Q)31 PAM4/NRZ 800 Benchtop
ML4039-JIT-BTP 30 4 up to PRBS31 NRZ 2200+ Jitter Impairments, benchtop
ML4039D 29.5 4 up to PRBS31Q PAM4/NRZ 1500 Benchtop
ML4039E 58 4 up to PRBS31, PRBS13Q, SSPRQ PAM4/NRZ 800 Benchtop
ML4039EN 58 4 up to PRBS31, PRBS13Q, SSPRQ PAM4/NRZ 800 Benchtop, crosstalk noise injection
ML4039EML 58 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 SFP28 Compliance Tester, Stand Alone
ML4070-QSFP 30 3x4 PRBS 7, 9, 15, 23, 31 NRZ 800 QSFP28 Compliance Tester, Stand Alone
Part number Max baud rate (GBd) Channels Pattern length Data format Amplitude max (mVpp diff.) Other
ML4054B 29 8 Up to PRBS31(Q) PAM4/NRZ 800 Manufacturing, benchtop, CFP8 format
ML4054B-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 PAM4 Jitter Generator, for use with any of the PAM4 BERTs such as ML4039D/E