• Silver-colored arista H-D400-4Q100-1M sfp+ transceiver modules with blue handles and metallic connectors for 400g active DAC
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Arista

Arista QDD-400G-VSR4-Arista | 400G QSFP-DD VSR4 Transceiver, MPO-12 APC, 50m OM4

QDD-400G-VSR4-Arista

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Description

The Arista QDD-400G-VSR4 is a 400G QSFP-DD short-reach multimode transceiver from Arista's 400G optics range. It is built for leaf-to-spine links and switch-to-host 400G connectivity in data centres, including AI clusters with 400G GPU or NIC interfaces and 2 x 200G switch-to-NIC or GPU breakout.

It carries 4 x 100G PAM-4 optical lanes at 850nm over parallel multimode fibre, converted from an 8 x 50G PAM-4 electrical interface by an internal gearbox. The MPO-12 APC connector reaches 50m on OM4 or 30m on OM3 fibre. The module is fully compliant with IEEE 400GBASE-VR4 and interoperates optically with 400GBASE-SR4 up to 50m. Maximum power draw is 12W, drawn from the host port, and the case operating temperature range is 0 to 70 C.

The module fits QSFP-DD ports on Arista platforms running EOS 4.31.1 or later and needs no licence or subscription. It works with the OSFP-400G-VSR4 over MPO-12 APC cabling, and can break out to 2 x 200G-SR2 or VR2 modules. It requires MPO-12 APC fibre and is not compatible with OSFP ports.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Fully compliant with IEEE 400GBASE-VR4 and optically interoperable with 400GBASE-SR4 and 400GBASE-VR4 over 50m
- 8 x 50G PAM-4 electrical and 4 x 100G PAM-4 optical interface, with an internal gearbox handling the conversion
- Breaks out into 2 x 200G links to 200GBASE-SR2 / VR2 compliant QSFP112 or OSFP-RHS modules
- Interoperates over 50m MMF with 400GBASE-SR4 / VR4 compliant QSFP112 or OSFP-RHS 400G modules
- MPO-12 APC connector reduces optical back reflectance
- Hot-swappable QSFP-DD module
- Backward compatible with 40G / 100G QSFP modules in a QSFP-DD port set to 100G or 40G

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

- Form factor: QSFP-DD
- PHY type: 400GBASE-VSR4 (compliant with 400GBASE-VR4)
- Data rate: 400GbE
- Electrical interface: 8 x 50G PAM-4
- Optical interface: 4 x 100G PAM-4, 4 fibre pairs, 1 wave per fibre
- Wavelength: 850 nm
- Connector: MPO-12 APC (8 of 12 fibres used)
- Cable type: Parallel multimode fibre, OM3 / OM4, 50.0 um core
- Reach: 50 m on OM4, 30 m on OM3
- Modal bandwidth: 2000 MHzkm (OM3) / 4700 MHzkm (OM4)
- Tx power: +4.0 to -4.6 dBm per lane
- Rx power: +4.0 to -6.3 dBm per lane
- Maximum power consumption: 12 W
- Operating case temperature: 0 to 70 C
- Storage temperature: -40 to 70 C
- Relative humidity: 5 to 95%
- Operating altitude: 0 to 10,000 ft
- Minimum EOS version: 4.31.1
- Safety: Laser Class 1 or 1M (IEC/EN 60825-1), EN/IEC 62368-1
- Certifications: CE, KCC, Australia RCM, UKCA, RoHS

FAQs

Q: Does this transceiver need a licence or subscription?
A: No. No licence or subscription is required. EOS 4.31.1 or later is the minimum supported release.

Q: What power does it draw?
A: Maximum 12 W per module, drawn from the host QSFP-DD port. It needs no separate power supply, but the platform must supply a heatsink that contacts the module.

Q: Which fibre and connector does it need?
A: It needs parallel multimode fibre terminated with MPO-12 APC connectors. Reach is 50m on OM4 or 30m on OM3. Do not use the MPO-12 UPC connectors of QSFP-100G-SR4 or 400G-SRBD with it.

Q: Can it connect to OSFP or 200G modules?
A: It is not compatible with OSFP ports, but it interoperates optically with the OSFP-400G-VSR4 over MPO-12 APC cabling. It can also break out to 2 x 200G-SR2 / VR2 modules over 50m multimode fibre.

Q: Will it work in a QSFP-DD port running at 100G?
A: Yes. Backward compatibility with 40G / 100G QSFP modules applies when the QSFP-DD port is set to 100G or 40G.

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