Arista Networks A-D400-Q400-20M Compatible 400G QSFP112 4 x 100G PAM4 to 400G QSFP-DD 8 x 50G PAM4 Active Optical Cable, 20m (66ft)
This page gives procurement and network teams a precise reference for Arista Networks A-D400-Q400-20M: a 400G AOC assembly in a fixed 20m (66ft) configuration. The QSFP112 to QSFP-DD interface, HT ordering identity and verified specifications are presented together so the required cable can be matched to the bill of materials without confusing it with another length.
OEM Part Number: A-D400-Q400-20MHT Part Number: A-D400-Q400-20M
Product Highlights
- Compatible alternative to Arista Networks A-D400-Q400-20M
- 400G connectivity at 400Gbps
- Interface configuration: QSFP112 to QSFP-DD
- Fixed length and part number: 20m (66ft), A-D400-Q400-20M
- Cable construction: AOC
- Maximum power consumption: 10W (QSFP112 End) 14W (QSFP-DD End)
- Minimum bend radius: 30mm
Specifications
| HT Part Number | A-D400-Q400-20M |
|---|---|
| Arista Networks Compatible | A-D400-Q400-20M |
| Manufacturer | HT |
| Form Factor | QSFP112 to QSFP-DD |
| Max. Data Rate | 400Gbps |
| Cable Length | 20m (66ft) |
| 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 |
Signal and Lane Configuration
The listed modulation format is QSFP112-4x 100G-PAM4QSFP-DD-8x 50G-PAM4. Both host interfaces must be configured for the same aggregate rate and lane arrangement. A connector that fits mechanically does not by itself guarantee that the remote port supports this encoding or breakout mode.
Network and Protocol Considerations
The intended application is determined by the host interface and protocol support. Listed interface and protocol references include QSFP112 MSA, QSFP-DD MSA, IEEE802.3ck, IEEE802.3bs, CMIS 5.1. Confirm that the host firmware and port configuration support the same operating mode.
Integrated Optical Assembly
The optical engines and fiber are permanently integrated into this AOC. There are no detachable optical modules to clean or exchange. Handle the complete assembly by its connector housings and cable, and keep both ends matched to the same interface specification.
Length Selection and Installation Planning
With 20m (66ft) available, the installer has more routing freedom but also more cable to control. Determine where any remaining service loop will be stored, preserve the stated bend radius and keep the loop away from sharp edges and hot exhaust. The integrated optical cable and both optical engines should remain accessible for inspection and removal. Within this family, A-D400-Q400-15M is shorter at 15m (49ft), while A-D400-Q400-25M is the next longer choice at 25m (82ft); comparing those two boundaries helps avoid both tension and unnecessary slack.
Position Within the Length Range
A-D400-Q400-20M occupies the middle of this family between A-D400-Q400-15M at 15m (49ft) and A-D400-Q400-25M at 25m (82ft). It adds 5m over the shorter option for extra routing clearance, while the next longer version adds another 5m. Measure the managed path and choose this version when its reach is sufficient without creating the slack associated with the longer assembly.
Procurement and Port-Mapping Review
A useful purchase order should identify the host platform, the expected OEM code and the exact cable length as separate pieces of information. This prevents a physically similar assembly from being substituted when the port identification or reach is different. For mixed-length installations, prepare one order line per part number and reconcile each delivered cable with its intended pair of ports. For this assembly, the minimum bend radius is 30mm; the stated power consumption is 10W (QSFP112 End) 14W (QSFP-DD End); the jacket material is OFNP.
Power and Thermal Planning
The rated power consumption is 10W (QSFP112 End) 14W (QSFP-DD End). Include this load in the host-port power and thermal budget, especially in densely populated switches. Maintain front-panel clearance and do not bundle the cable so tightly that it obstructs airflow around the connectors.
Cable Construction and Routing
This assembly uses OFNP jacket, minimum bend radius 30mm. These mechanical characteristics affect how the cable should be dressed behind the equipment. Avoid sharp edges, excessive ties and repeated tight bends close to the connector boots.
Arista Networks Compatibility and Factory Testing
Our procurement-oriented compatibility check begins with the OEM reference and ends with a live host link. We record the physical length separately from the identification configuration, so the cable supplied for this page remains the stated version rather than a generic length substitute. The check includes receive activity and diagnostic indications, followed by a final inspection of both ends.
Ordering Information
For a clear bill of materials, quote the OEM reference, HT part number, length and quantity on the same line. Add the switch or server model and software release when a pre-order review is required; project labels can repeat those details for receiving and installation teams. Keep A-D400-Q400-20M associated with 20m (66ft) throughout the order and receiving record.
Quality Assurance and Packaging
Before packing, the assembly is checked for connector condition, identification and link operation. Cables for multi-line orders can be labelled and grouped by part number, making it easier to match each length to the procurement record without opening every protective bag. Volume orders can include customer references on the labels and carton list.
Frequently Asked Questions
Is this an original Arista Networks cable?
No. It is an HT-manufactured compatible alternative for equipment that specifies Arista Networks A-D400-Q400-20M.
Are separate transceivers or patch leads required?
No. This is one complete direct-attach assembly. The ends are not detachable modules and should not be separated from the cable.
Can excess cable be folded into a compact bundle?
No. Use a supported, bend-safe service loop and observe the listed minimum bend radius. Do not crease the cable or tighten ties around the connector boots.
Will any matching connector operate at the same speed?
Not necessarily. Both hosts must support the stated rate, identification, lane mapping and any required breakout configuration; mechanical compatibility alone is insufficient.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, while production quantities are confirmed with the order. Worldwide courier services are available, with air or sea freight for consolidated shipments; freight-collect delivery and coordination with a customer’s logistics provider can be arranged.