10/100BASE-T SFPArista Networks A-D400-Q400 Compatible 400G QSFP112 4 x 100G PAM4 to 400G QSFP-DD 8 x 50G PAM4 Active Optical Cable
This Arista Networks A-D400-Q400 compatible cable series provides 400G connectivity through a QSFP112 to QSFP-DD configuration. It is a complete optical assembly with permanently attached ends and integrated fiber. The page brings together the series specifications, compatibility guidance and direct links to the individual length and OEM part-number pages used for ordering.
Series Part Number: A-D400-Q400HT Part Number: A-D400-Q400
Product Highlights
- HT-manufactured compatible alternative for Arista Networks A-D400-Q400
- 400G aggregate connectivity at 400Gbps
- Interface configuration: QSFP112 to QSFP-DD
- AOC
- Length configurations covered: 1m (3ft), 2m (7ft), 3m (10ft), 5m (16ft), 7m (23ft), 10m (33ft), 15m (49ft), 20m (66ft), 25m (82ft) and 30m (98ft)
- Power consumption: 10W (QSFP112 End) 14W (QSFP-DD End)
Available Lengths and Corresponding Part Numbers
The documented configurations are 1m (3ft), 2m (7ft), 3m (10ft), 5m (16ft), 7m (23ft), 10m (33ft), 15m (49ft), 20m (66ft), 25m (82ft) and 30m (98ft). Each link below opens the separate product page for that physical length and its corresponding OEM part number. Select the exact assembly required by the route and purchase order; custom project lengths can be discussed separately.
Compatible OEM Part Numbers
- A-D400-Q400-1M
- A-D400-Q400-2M
- A-D400-Q400-3M
- A-D400-Q400-5M
- A-D400-Q400-7M
- A-D400-Q400-10M
- A-D400-Q400-15M
- A-D400-Q400-20M
- A-D400-Q400-25M
- A-D400-Q400-30M
Specifications
| Arista Networks Compatible | A-D400-Q400-3M |
|---|---|
| Manufacturer | HT |
| HT Part Number | A-D400-Q400 |
| Form Factor | QSFP112 to QSFP-DD |
| Max. Data Rate | 400Gbps |
| Cable Length Options Covered | 1m (3ft), 2m (7ft), 3m (10ft), 5m (16ft), 7m (23ft), 10m (33ft), 15m (49ft), 20m (66ft), 25m (82ft) and 30m (98ft) |
| Cable Type | AOC |
| Wavelength | 850nm |
| Minimum Bend Radius | 30mm |
| Transmitter Type | VSCEL |
| Receiver Type | PIN |
| Max. Power Consumption | 10W (QSFP112 End) 14W (QSFP-DD End) |
| Jacket Material | OFNP |
| DSP | TX & RX Built-in DSP |
| DDM/DOM | Supported |
| Modulation Format | QSFP112-4x 100G-PAM4QSFP-DD-8x 50G-PAM4 |
| Commercial TemperatureRange | 0 to 70°C (32 to 158°F) |
| Protocols | QSFP112 MSA, QSFP-DD MSA, IEEE802.3ck, IEEE802.3bs, CMIS 5.1 |
Applications and Deployment
An AOC removes the separate module-and-fiber interfaces from a high-speed connection. Both optical ends remain attached to the cable, simplifying polarity control and connector handling. Host identification, wavelength plan, aggregate rate and any breakout configuration must still agree across the link. For this series, the listed interface is QSFP112 to QSFP-DD and the aggregate rate is 400G.
Quality Assurance and Packaging
Each assembly receives a visual connector inspection and functional link check before it is coiled and protected. Packaging is selected to avoid compressing the cable into a tight bundle, and optional rack-based labels help maintain an orderly installation when many identical interfaces are populated together. Both connector ends are inspected as part of the complete assembly, and protective packing is selected to avoid tight bends during transport and storage.
Cable Construction and Routing
The specification table records the jacket material is OFNP; the minimum bend radius is 30mm; the power consumption is 10W (QSFP112 End) 14W (QSFP-DD End). Use those values when preparing the rack pathway and receiving checklist. Do not pull a connector by its cable, compress the run under tight ties or force excess length into a sharp coil. Connector protection should remain in place until the assembly is ready for insertion.
High-Density Rack Integration
In a densely populated rack, connector access and airflow are part of the link design. Choose the shortest length that follows the managed path comfortably, avoid tight bundles around the connector housings and preserve room for latch operation. Where power consumption is listed, include every populated interface in the host thermal budget rather than assessing a single cable in isolation. For this series, keep the interface rate, AOC construction and length-specific OEM reference together throughout that review.
Ordering Information
Provide the exact part number, length, quantity and target interface density. For multi-rack projects, list each length separately and identify any preferred carton grouping. Host model and software information can be included for a compatibility review before production or dispatch. For this series, follow the corresponding length link, quote that exact OEM part number and keep different lengths on separate order lines. HT part number A-D400-Q400 identifies the product family; the linked page provides the final length-specific identity.
Arista Networks Compatibility and Factory Testing
The assembly is evaluated for host recognition and stable link operation, with diagnostics checked where the interface provides them. This approach verifies more than electrical or optical continuity. Exact platform and firmware information remains valuable in high-density deployments because port mode and qualification policy can differ within the same connector family. Series-level inspection is followed by the exact length and OEM configuration selected for dispatch. Functional verification includes link establishment and diagnostic indications where the host exposes them.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.
Frequently Asked Questions
Is this an original Arista Networks cable?
No. It is an HT-manufactured compatible cable for equipment that specifies A-D400-Q400, not an original Arista Networks-branded product.
Are different lengths and OEM part numbers separate products?
Yes. Where a length has its own OEM reference, follow the corresponding link above and order that exact part number on its own line. Do not substitute another length only because the connector arrangement is the same.
Does this AOC cable require separate modules at each end?
No. The connector ends and cable form one complete direct-attach assembly. The ends are not detachable standalone transceivers, and the complete product is tested together.
What information helps confirm compatibility?
Provide the equipment manufacturer and model, port type, hardware revision and software release, together with the required OEM reference, length and quantity. Breakout projects should also identify the intended lane configuration.
