NVIDIA Mellanox MSN4800-WS4R Spectrum-3 Modular Open Ethernet Chassis: This is a 4U modular chassis populated with 8x MSN4800-C16 line cards, providing 128x 100GbE QSFP28 ports. The chassis is built on the NVIDIA Spectrum-3 ASIC architecture and ships with 4x hot-swap AC power supplies. The WS4R suffix denotes the white-box variant with Reverse (C2P) airflow and an x86 control CPU. This is a fully functional modular Ethernet chassis — not a chassis kit without line cards. This is a refurbished unit tested by T.E.S IT-SOLUTIONS.
Engineering Context
The MSN4800-WS4R is engineered for cloud-scale data center cores and AI fabric aggregation. The Spectrum-3 ASIC supports up to 12.8 Tb/s aggregate switching with deterministic, zero-packet-loss forwarding under microbursts. The chassis runs ONIE-based NOS — Mellanox Onyx, NVIDIA Cumulus Linux, or SONiC — and supports advanced features including RoCEv2 acceleration, EVPN-VXLAN, adaptive routing, dynamic shared buffers, and What-Just-Happened (WJH) packet-event telemetry. The 4U modular design uses 8x line cards with 16 QSFP28 ports each.
Deployment & Use Cases
Spine layer in cloud-scale leaf-spine fabrics. AI/ML training cluster aggregation where RoCEv2 and adaptive routing reduce GPU job tail latency. NVMe-oF storage backbone requiring 100GbE line-rate aggregation. Multi-tenant cloud environments using EVPN-VXLAN. Large enterprise data center cores consolidating fixed switches into a modular platform.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MSN4800-WS4R
ASIC: NVIDIA Spectrum-3
Ports: 128x QSFP28 (100GbE) — 8x MSN4800-C16 line cards installed
Switching Capacity: 12.8 Tb/s
Form Factor: 4U modular chassis
Airflow: C2P (Connector-to-Power / Reverse)
Control CPU: x86 Xeon-class
Power Supplies: 4x hot-swap AC
Supported NOS: Mellanox Onyx, NVIDIA Cumulus Linux, SONiC (ONIE)
Advanced Features: RoCEv2, EVPN-VXLAN, WJH telemetry, adaptive routing, dynamic buffers
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with QSFP28 transceivers (SR4, LR4), QSFP28 AOCs, and QSFP28 DACs across all 128 ports. Supports breakout to 4x 25GbE per port via QSFP28-to-4xSFP28 cables with FEC configuration. This is an Ethernet-only platform — it does not support InfiniBand. C2P airflow requires standard cold-aisle-front rack orientation; do not mix C2P and P2C units in the same rack column. The 4U chassis requires standard 19" rack rails and adequate front clearance for cable routing across all 128 ports.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS lab-validates every chassis: ASIC health, all line-card port throughput, PSU redundancy failover, and management plane stability. We provide design consultation for spine-leaf and AI fabric architectures, 1-3 day handling, global shipping, and a comprehensive warranty. Visit tes-itsolutions.com for the full enterprise networking catalog.