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400G Test Module

RXT-6400 New

Native QSFP-DD PAM4 400GE
(No adapters required)

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

The RXT-6400 is the first truly portable 400G test set offering native QSFP-DD PAM4. 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 a future upgrade path for all-in-one 10M-to-400GE testing. Evaluation, Interop, Installation, verification, commissioning, monitoring, troubleshooting, and maintenance tasks are simplified thanks to a combination of intuitive user interface 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, I2C/MDIO Read/Write, transceiver check and stress, Lane BERT, Throughput test, IPv4/IPv6 and much more.



  • Native 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 QSFP-DD transceivers, networking equipment and 400GE links
  • Advanced and flexible state-of-the-art FPGA-based design, with native PAM4 transceivers, provides future-proof hardware support for 400GE evolution, emerging standards, test functions, requirements and applications
  • Wide range of supported 400GE interfaces, including 400GBASE-SR8, FR8, LR8, DR4, and FR4
  • MDIO/I2C registers Read and Write
  • Per-lane PAM4 pre-emphasis settings
  • KP4 FEC codeword symbol errors distribution and Skew
  • Ethernet Throughput performance test
  • Hardware ready to support QSFP56, QSFP28, QSFP+, SFP56, SFP28, SFP+, SFP, RJ45 interfaces for lower rate applications
  • Battery backup for efficient operation and mobility within large equipment rooms and datacenters (no need for constant rebooting)

QSFP-DD PAM4 Interface

  • Native support for 400G QSFP-DD transceivers
  • 400GBASE-SR8, FR8, LR8, DR4, and FR4
  • Supports IEEE 802.3bs and MSA compliant transceivers*
  • Native PAM4 electrical interface
  • Per-lane post and pre-emphasis settings
  • Lane BERT with independent test patterns


  • 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
  • Service disruption time measurement
  • 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 among large datacenters, nodes, COs, R&D and evaluation labs.

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
  • IPv4, IPv6, VLAN, and MPLS support

 * Check with factory for transceivers availability