VeEX RXT-6402 Advanced Dual 400G Multi-service Test Module

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  • 400G Down to 10M Ethernet Testing
  • Fibre Channel

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VeEX RXT-6402 Advanced Dual 400G Multi-service Test Module

Advanced 2x400GE Multi-service handheld test set for Lab to Field Applications

VeEX® RXT-6402 is the industry’s most flexible, compact, and future-proof handheld test solution for Core, Metro, Datacenter, and Access applications. The VeEX RXT-6402 Dual 400G offers the flexibility of testing current interfaces and supporting future expandability for applications including Transport, Aggregation, cross-connect, 5G x-haul, and NEMs field support.

The RXT-6400 family has been the leading test solution for portable 400G testing. The RXT-6402 expands its applications and flexibility. Equipped dual test ports to support all common optical transceiver form-factors, AOCs and DACs, this module is a perfect complement to the RXT Platform, extending its testing range to 2x400 Gbps and offering an upgrade path to all-in-one 400GE multi-service testing. 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-to 4 test features, such as FEC codeword Error distribution analysis, PAM4 pre-emphasis, skew, transceiver check and stress, Lane BERT, Throughput test, IPv4/IPv6 and much more.

As 400GE becomes mainstream, it is important for test equipment to support all test interfaces required to maintain existing legacy infrastructure and data links.


  • 2x400GE concurrent testing capabilities
  • Offers dual ports for all pluggable optics form factors, required for AOC/DAC, fan-out and wrap-around tests (from 10M to 400GE)
  • Up to four concurrent and independent tests
  • Native QSFP-DD, QSFP56, SFP-DD, and SFP56 PAM4 hardware for best-in-class signal integrity (no adapters required).
  • Supports testing for all common form factors, including QSFP-DD, QSFP56, SFP-DD, and SFP56 transceivers, DACs,AOCs, network 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, CR4 and 400ZR/ZR+.
  • Complete industry-standard Ethernet link test feature set for Layers 2, 3 and 4.
  • I2C/MDIO registers Read and Write.
  • Per-lane PAM4 host pre-emphasis settings.
  • Signal integrity check with FEC codeword symbol errors distribution and Skew.
  • Transceivers power consumption monitoring (voltage, current) and variable voltage supply.
  • Dedicated QSFP-DD head cooling fans (field replaceable) to optimize operating temperature verification of high-power class transceivers, such as ZR/ZR+
  • All-in-one solution with common legacy test interfaces.
  • Internal and external (cage) QSFP-DD temperature monitoring with overheating protection.
  • High-capacity power supply provides support for long range coherent line interface transceivers and 2x400GE applications
  • Battery (backup) operation improves mobility and efficiency in large hyperscale data centers, nodes, COs, R&D, evaluation labs and other field applications.
  • High-efficiency intelligent cooling system
  • Full-feature portable hand-held test set form factor, without compromises.


  • Bring-into-service, verification and troubleshooting of high- speed Ethernet links.
  • Optical transceivers verification.
  • DAC and AOC verification, requiring full dual port capabilities.
  • Fan-out tests.
  • Evaluation labs and field support.
  • Comprehensive test applications for layers 1-4, from 10M to 400GE.
  • Full rate 400GE Throughput and frame loss measurements.
  • PCS & RS-FEC layer testing.
  • PAM4 signal integrity testing with multi-lane unframed BERT.
  • I2C/MDIO verification and programming.
  • Advanced optical transceiver test.
  • Portable for field testing, evaluations, demonstrations, interop check, benchmarking, troubleshooting, link verification, etc.
  • Maintenance and troubleshooting of legacy transmission equipment, interfaces and links.
  • Robust construction and enhanced cooling for field applications.

Test Interfaces

  • 2x QSFP-DD (PAM4)
  • 2x QSFP56/QSFP28/QSFP+ (PAM4/NRZ)
  • 2x SFP-DD/SFP56/SFP28 (PAM4/NRZ)
  • 2x SFP+/SFP (NRZ)
  • 2x RJ45
  • 1x RJ48 and 3x SMA (legacy)
  • 2x Clock Inputs and 2x Outputs
  • Four independent test port groups

PAM4 Interfaces

  • Native PAM4 support for 400G QSFP-DD, QSFP56, SFP-DD, SFP56, transceivers.
  • 400GBASE-SR8, FR8, LR8, DR4, FR4, LR4, CR8, CR4, and 400ZR/ZR+.
  • Supports IEEE 802.3bs and MSA compliant transceivers.
  • 300W supply supporting power classes 1 through 8.
  • Cage temperature monitoring.
  • QSFP-DD high-temperature warning threshold, overheat protection and field-replaceable external QSFP-DD head cooling system.
  • Per-lane post and pre-emphasis settings.
  • Lane BERT with independent test patterns.

MDIO Read/Write

  • Complete MDIO I2C access.
  • Raw read/write capability for all MDIO registers.
  • Formal display of commonly used fields.
  • Module hardware control pin read/write access.

Optical Power Measurement

  • Global and per lane output enable/disable.
  • Received per lane and composite optical power level monitoring.

Transmit Clock Sources

  • Internal 2.5 ppm VCXO and optional GPS 1PPS.
  • Recovered: from the incoming signal.
  • External: 1.544 MHz, 2.048 MHz, 10 MHz, BITS/1.544 Mbps, SETS/2.048 Mbps, and 1PPS via 50 Ohm SMA Connector.

Line Frequency Offset Generation

  • Line frequency offset generation ±100 ppm in steps of 0.1 ppm.

Line Frequency Measurement Capability

  • Displays measured transmit line frequency in kHz.
  • Displays measured transmit line frequency offset from reference clock in current, min, max ppm.
  • Measures all lanes.

Stress Test: Pre and Post-FEC Test Suite

  • Simple one button pass/fail test for verifying all transceiver properties.
  • Advanced user defined thresholds.
  • Simple test report includes settings, Pass/Fail, and detailed results.
  • Frequency pulling range stress test.
  • Pre and Post FEC test.

Advanced Optical Transceiver Test Suite

  • Pre-FEC BER validation on a per-lane basis, over operational voltage and frequency offset range to verify optical module integrity before FEC is applied to the PAM4 signal (400GE interfaces).
  • Pre-Framed BER (Lane BERT) validation for non PAM4 interfaces.
  • Voltage, temperature, and Pre-FEC BER are monitored and displayed for the duration of the test. A histogram function clearly displays all three measurements for easy correlation and tracking of any abnormal changes.
  • Pre-FEC BER and Optical Power threshold settings for PASS/ FAIL indication.
  • Pre-emphasis: Pre-taps, post-taps, and attenuation settings for PAM4 signal conditioning on the host side to help verify and stress transceiver tolerance and performance.
  • Supply Voltage Tolerance Verification: Sweep range from 3.135V to 3.465V (3.300V +/- 5%) to verify compliance with optical transceiver MSA standard.
  • Power Consumption Verification: Monitors the optical transceiver’s power consumption (Watts), to verify conformance to its specified power class.
  • Temperature Monitoring: QSFP-DD module and cage temperature monitoring with built-in shutdown protection of the optical module if the temperature increases beyond a certain high temperature.
  • Frequency Tolerance Verification: Sweep range from -100 ppm to +100pm (in 0.1ppm/step), to verify compliance with the 400GE IEEE 802.3 +/- 20 ppm tolerance specification.
  • I2C Baud Rate Sweep: QSFP-DD and OSFP sweep range 100K to 4000K. QSFP28 sweep range (20K to 1000K).

For more information: VeEX