800G Stress eye BERT
- Series: BERT - Brand: Te-lead
The ML4079EN is a fully featured 800G BERT that can be configured for eight channels of 18.5-29 and 37-61 G PAM4 or NRZ.
The transmitters support all standard test patterns mandated by IEEE802.3ck stress testing and OIF such as PRBS13Q, SSPRQ, PRBS31Q, etc. Tx can also be programed to output a user-defined pattern.
The ML4079EN supports transmitter and receiver equalization to overcome signal integrity impairments due to channel losses or reflections.
The ML4079EN supports Real Hardware FEC, with the following FEC modes:
• 400G line KP4
• 100G line KP1
• 100G line KR1
Once the FEC is enabled, the user will be able to see the post-FEC BER which indicates the bit error rate after enabling FEC and the number of errored bits being corrected in real time.
Additionally, users can opt to programmatically add an ISI channel equivalent to a frequency-dependent attenuator with 1 to 9 dB loss at Nyquist.
The ML4079EN is specifically designed to inject jitter and crosstalk noise (interference) into its signal generation. This capability is uniquely fully integrated into the BERT and does not require any external equipment.
Transmit
• Data Rates: 20-29 & 36-61 GBaud (112 Gbps)
• Ability to tune the bit rate in steps of 100 kbps and find the RX PLL locking margin
• Independent control of inner eye levels
• Up to 1.2 Vppd output swing at high rates and up to 1.8 Vppd at low rates
• Supports Gray coding
• Error injection
• 3-tap Pre- and Post-emphasis or 7-tap linear FFE
• Real hardware FEC. SER and FEC measurements and margin available on channels individually as well as on 100G, 400G blocks
• Available patterns:
• PRBS7/9/11/13/15/16/23/31/58
• PRBS13Q, PRBS31Q
• SSPRQ
• Square wave
• Burst and random noise injection
• Jitter Injection in both FM and PM Mode and different jitter injection types: Sinusoidal Jitter (SJ), Random Jitter (RJ), and Bounded Uncorrelated Jitter (BUJ)
• Jitter and Interference tolerance and marginal automated testing following IEEE 802.3ck
Receive
• SNR monitoring over time
• Rx Polarity Inversion
• PAM histogram monitor
• Error-detection on following patterns:
• PRBS 7/9/11/15/16/23/31
• PRBS13Q and PRBS31Q
• Automatic pattern detection
• LOS indicators
• Rx Equalizers:
• DFE: Decision Feedback Equalizer
• RC: Reflection Canceller
• MPICAN: Multipath Interference Canceller
Jitter Tolerance – JTOL Capabilities
When using high-speed signals, it is imperative to take into consideration the effect of jitter components coming from different sources and affecting the signal quality. For this reason, jitter tolerance is no longer an option but a hard requirement to characterize the DUTs.
Interference Tolerance – ITOL Capabilities
The ML4079EN enables a noise injection feature to emulate real-life crosstalk scenarios along with shallow loopback testing. Noise implementation can take the form of a continuous interference, burst crosstalk, or single shot noise and can be configured on each channel independently. The shallow loopback function works with a variety of traffic types including unframed PRBS, framed Ethernet and FEC traffic.
