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400G Test Module

RXT-6400 New

Now supports OSFP and QSFP-DD
Native PAM4 400GE design
(No adapters required)

First native OSFP & QSFP-DD PAM4 400GE Test Equipment, in true portable form factor, enables Lab-to-Field Transition

The RXT-6400 is the first truly portable 400G test set supporting native PAM4 QSFP-DD and OSFP. Equipped to support all common transceiver form-factors, this module is a perfect complement to the RXT Platform, extending its testing range to 400 Gbps and offering all-in-one 1GE-to-400GE testing capabilities. Installation, verification, commissioning, evaluation and maintenance tasks are simplified thanks to a combination of intuitive GUI and powerful test functions. Novice users benefit from the easy-to-use GUI, while experienced users will appreciate an array of advanced layer 1-4 features, such as FEC codeword Error distribution analysis, PAM4 pre-emphasis, skew, transceiver check and stress, Lane BERT, Throughput test, IPv4/IPv6, transceiver testing and much more.



  • Native OSFP and QSFP-DD PAM4 hardware for best-in-class signal integrity (no adapters required)
  • 400G Ethernet testing per IEEE 802.3bs specification with KP4 Forward Error Correction (FEC)
  • Provides all the necessary features to test transceivers, DAC and AOCs, including OSFP and QSFP-DD transceivers, networking equipment and 400GE links
  • Advanced and flexible state-of-the-art FPGA-based design provides future-proof hardware support for emerging standards, test functions and applications
  • Wide range of supported 400GE interfaces, including 400GBASE-SR8, FR8, LR8, DR4, FR4, LR4, CR8 and CR4
  • MDIO/I2C registers Read and Write
  • Per-lane PAM4 pre-emphasis settings
  • KP4 FEC codeword symbol errors distribution and Skew
  • Ethernet Throughput test
  • Also supports QSFP56, QSFP28, QSFP+, SFP28, SFP+ interfaces for lower rate applications
  • Battery backup for efficient operation and mobility within datacenters (no need for constant rebooting)


  • Bring-into-service, verification and troubleshooting of high-speed Ethernet links
  • Transceivers, DAC and AOC verification
  • Evaluation labs and field support Comprehensive 400GE test applications for layers 1-4
  • Full rate 400GE Throughput and frame loss measurements
  • PCS & RS-FEC layer testing with skew generation and analysis
  • PAM4 signal integrity testing with multi-lane unframed BERT
  • MDIO verification and programming including and QSFP-DD Module Health check and stress feature
  • High speed lane clock stressing/analysis and optical power level verification
  • Portable for field testing, evaluations, demonstrations, interop check, benchmarking, troubleshooting, link verification, etc.
  • Battery power for mobility within large datacenters, nodes, COs, R&D and evaluation labs.
  • No carts or long reboots required.

Test Interfaces

  • 1x OSFP PAM4
  • 1x QSFP-DD PAM4
  • 2x QSFP28/QSFP+ NRZ
  • 2x SFP28/SFP+/SFP NRZ
  • 2x Clock Input/Output
  • 1x Eye Clock Output

PAM4 Interfaces

  • Native support for 400G QSFP-DD and OSFP transceivers
  • 400GBASE-SR8, FR8, LR8, DR4, FR4, LR4, CR8 and CR4
  • Supports IEEE 802.3bs and MSA compliant transceivers*
  • 15W supply supporting power classes 1 through 7
  • Transceiver voltage control and power consumption monitoring
  • Internal transceiver’s and cage temperature monitoring
  • Native PAM4 electrical interface (no internal or external adapter required)
  • Advanced transceiver verification test
  • Per-lane post and pre-emphasis settings
  • Lane BERT with independent test patterns

400G Ethernet Testing

  • 400G Ethernet per IEEE 802.3bs
  • Optical signal levels (TX and RX lanes), frequency
  • Advanced KP4 FEC stress testing and analysis
  • Physical, PCS/FEC, and Ethernet layer verification
  • Throughput test, Frame Loss, Round Trip Delay (RTD). Errors, Alarms, events counters and rates
  • Error and Alarm Injection

Ethernet Testing for 100GE and below

  • 100GE, 40GE, 10GE, 1GE (50GE and 25GE ready)
  • Optical signal levels (TX and RX lanes), frequency
  • Physical, PCS, and Ethernet layer verification
  • RFC2544, Throughput test, Frame Loss, Round Trip Delay (RTD). Errors, Alarms, events counters and rates
  • Error and Alarm Injection
  • Transceiver testing

 * Check with factory for transceivers availability