QSFP/QSFP+ passive electrical loopback is used for testing QSFP/QSFP+ transceiver ports in board level test. By substituting for a full-featured QSFP/QSFP+ transceiver, the electrical loopback provides a cost effective low loss method for QSFP/QSFP+ port testing. Attenuation options are available in nominal and attenuated versions including 0db, 3.5db and 5db; power options are 1W, 2W, 3.5W; plug in and out can reach to 500times.

QSFP/QSFP+ is packaged in a standard MSA housing compatible with all QSFP/QSFP+ ports. Transmit data from the host is electrically routed (internal to the loopback module) to the receive data outputs and back to the host. Since the loopback module does not contain laser diodes, photodiodes, laser driver or transimpedance amplifier chips, etc., it provides an economical way to exercise QSFP/QSFP+ ports during R&D validation, production testing, and field testing. The QSFP+ loopback provides power Class 1, 2, 3 or 4 loading using a customer supplied +3.3V voltage supply.

In addition to the electrical loopback function, the QSFP+ loopback provides an MSA standard 2-wire serial communication interface to digital diagnostics and pre-loaded EEPROM memory maps; both standard and custom memory maps are available.



QSFP+ Loopback

  • Customizable power consumption
  • Custom Memory Maps
  • Supports 40Gb/s total data rate
  • Full SFF-8436 MSA Comp
  • Hot-pluggable MSA foot print
  • Temperature range from 0° to 70°C
  • Compliant with SONET, SDH, GBE, FC
  • MSA Compliant EEPROM
  • Power Consumption Different Option: 1W, 2.5W, 3.5W
  • Internal Attenuation Different Option: 0dB, 3.5dB, 5dB
  • QSFP Port/System
  • Server blade testing
  • ITU-T Recommendation G.957 (STM-1, 4 & 16)...
  • Ethernet IEEE 802.3 (Gigabit, 10 Gigabit and 40 Gigabit Ethernet)
  • SDR, DDR and QDR
  • SONET, SDH, GBE, FC Support, Infiniband
P/N Description Data Rate(bps) Attenuation(dB) Power Option(W) Plug in and out
CAB-QSFP-LB0PL1 QSFP+ electrical passive loopback 40G 0 1 500 Times
CAB-QSFP-LB0PL2.5 QSFP+ electrical passive loopback 40G 0 2.5 500 Times
CAB-QSFP-LB0PL3.5 QSFP+ electrical passive loopback 40G 0 3.5 500 Times
CAB-QSFP-LB0 QSFP+ electrical passive loopback 40G 0 0 500 Times
CAB-QSFP-LB3.5 QSFP+ electrical passive loopback 40G 3.5 0 500 Times
CAB-QSFP-LB5 QSFP+ electrical passive loopback 40G 5 0 500 Times
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