QSFP28 Electrical Loopback

The Timbercon EL-13-08002 QSFP28 passive electrical loopback is used for testing QSFP28 transceiver ports in board level test. By substituting for a full-featured QSFP28 transceiver, the electrical loopback provides a cost effective low loss method for QSFP28 port testing.

The EL-13-08002 is packaged in a standard MSA housing compatible with all QSFP28 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 QSFP28 ports during R&D validation, production testing and field testing. The EL-13-08002 provides QSFP28 power Class 1, 2, 3, or 4 loading using a customer supplied +3.3V voltage supply. Power Classes 5, 6 and 7 are available upon request.


  • QSFP port/system testing
  • Ethernet IEEE 802.3 (Gigabit, 10 Gigabit, 40 Gigabit, and 100 Gigabit Ethernet)
  • SDR, DDR and QDR Infiniband Transmission
  • SONET, SDH, GBE, Fibre Channel Support


  • Customizable power consumption
  • Dual LED indicator
  • Custom memory maps available
  • Built in diagnostic functions
  • Supports 100Gbps total data rate
  • Host-pluggable MSA footprint
  • Full SFF-8665 MSA compliant
  • Temperature range from 0◦ to 80◦C
  • No reference clock required
  • Compliant with SONET, SDH, GBE, Fibre Channel
  • MSA Compliant EEPROM
  • Power Classes 1 through 7 are available


  • Economical and flexible 100Gbps QSFP28 port testing
  • Board level system testing
  • Power on validation
  • Excellent signal integrity

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