400G QSFP-DD Loopback Module


BizLink® QSFP-DD loopback module is designed to test QSFP-DD ports effectively by looping back electrical signal. This module is a 8-channel transmission which supports data rates of up to 400Gbps. QSFP-DD loopback are backwards plug compatible with existing 100G based systems and support 200G (8 channels @ 25G NRZ) or 400G (8 channels @ 50G PAM 4) signaling transmission.


  • 25G per lane NRZ and 50G PAM4 per channel leading to 200G / 400G bandwidth
  • AC coupled high speed interfaces
  • Setups of different power levels acc. to MSA
  • Programmable power dissipation up to 20 W
  • Communication over I2C Bus with up to 1 MHz
  • LEDs for module state indication
  • Configurable low speed signals allowing testing of all control signals
  • Housings including heatsink / airflow channels for thermal management
  • Diagnostic monitoring of voltage and temperature
  • EEPROM MAP according to MSA
  • Temperature rating up to 85°C
  • EMC/EMI optimized housing
  • Hot pluggability