QSFP/QSFP+ Electrical Loopbacks

The Timbercon EL-12-07002 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.

The EL-12-07002 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 EL-12-07002 provides QSFP/QSFP+ power Class 1, 2, 3 or 4 loading using a customer supplied +3.3V voltage supply.

In addition to the electrical loopback function, the EL-12-07002 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/QSFP+ Passive Electrical Loopback Datasheet


  • Customizable power consumption
  • LED indicator
  • Custom Memory Maps
  • Built-in diagnostic functions
  • Support 40Gbps total data rate
  • Host-pluggable MSA footprint
  • Full SFF-8436 MSA compliant
  • No reference clock required
  • Compliant with SONET, SDH, GBE, FC
  • MSA compliant EEPROM


  • Economical QSFP/QSFP+ port testing
  • Custom Memory Maps
  • Board level system testing
  • Power on validation
  • Excellent signal integrity with 26mm average loopback trace length of standard FR4


  • QSFP port/system 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

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