Arista 800G OSFP 2xFR4 Optical Transceiver

The Arista OSFP-800G-2FR4 is an 800G OSFP form-factor optical transceiver designed for high-density, high-bandwidth interconnects in next-generation data center switching fabrics. It implements the 800GBASE-FR4 dual-port architecture, combining two independent 400G FR4 optical channels within a single OSFP housing. Each 400G channel uses four wavelengths in the 1310 nm O-band via coarse wavelength division multiplexing (CWDM4), with each lane operating at 100G PAM4 signaling, yielding an aggregate 800G bidirectional capacity over duplex single-mode fiber (SMF).

The module conforms to the OSFP MSA mechanical and electrical specification and interfaces with host switch ASICs via dual 400G electrical interfaces, each comprising eight 50G PAM4 electrical lanes. This architecture is purpose-built to connect directly to Arista 7800R3 and next-generation AI spine and leaf switches, enabling single-transceiver port utilization at 800G without breakout cabling overhead. The dual-port 2xFR4 design supports reaches up to 2 km over OS2 single-mode fiber, making it well suited for campus-scale and inter-row data center connectivity as well as tightly coupled AI/ML compute cluster interconnects.

As AI and machine learning training workloads drive explosive demand for lossless, low-latency east-west bandwidth, the OSFP-800G-2FR4 addresses the need for scalable 800G optical density without compromising power efficiency or port count. The transceiver supports standard digital diagnostics monitoring (DDM/DOM) via the CMIS 5.0 management interface, enabling real-time visibility into optical power levels, temperature, voltage, and bias current—capabilities essential for proactive fault isolation in large-scale AI fabric deployments.

Ideal for

• 800G spine-to-leaf interconnects in AI/ML GPU cluster fabrics requiring non-blocking, lossless east-west bandwidth at scale
• High-density 800G uplinks between Arista AI spine switches and top-of-rack leaf switches in hyperscale data center builds
• Inter-row and inter-pod optical connectivity up to 2 km across large enterprise or colocation data center campuses using existing OS2 SMF infrastructure
• Consolidation of two 400G links into a single 800G OSFP port to reduce cabling complexity and improve front-panel port density on next-generation switches
• Upgrade path for existing 400G FR4 SMF plant, leveraging the same fiber infrastructure while doubling per-port throughput to 800G
• Low-latency storage networking backbones connecting NVMe-oF all-flash arrays to high-performance compute nodes in AI inference infrastructure

Technical specifications

Available from Omnixon Global. Submit an RFQ and our team will confirm configuration and availability for your order.