• Silver-colored rack-mounted arista dcs-7808r4-fm network switches with ports and ventilation slots on back side
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Arista

Arista DCS-7808R4-FM | 7800R4 Fabric Module for 7808 Chassis, Hot-Swappable

DCS-7808R4-FM

Stock Status: Enquire

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Description

The Arista DCS-7808R4-FM is a high-performance fabric module engineered for the 7808R4 Series modular data center chassis. This hot-swappable module provides non-blocking fabric interconnects between line cards, supporting up to 28.8 Tbps throughput with fully distributed scheduling and cell-based fabric architecture. Designed for AI spine, data center core, and large-scale leaf-spine deployments requiring lossless, low-latency performance at scale.

Features

Cell-based fabric architecture with uniform cell spraying across all fabric links for 100% efficiency
- Fully distributed virtual output queuing (VOQ) for lossless, fair forwarding
- Active-active operation with hot-swap capability for zero-downtime maintenance
- Midplane-less direct connection design between line cards and fabric modules
- Graceful degradation support maintains operation even with partial fabric failures
- Integrated thermal management with 8 individually serviceable fan modules
- Supports AI/ML cluster interconnects with deterministic low-latency performance
- Compatible with 7800R4, 7800R4C (AI-optimized), and 7800R4K (enhanced routing) line cards
- Enables up to 10.8 billion packets per second system throughput
- Supports EVPN/VXLAN gateway, Layer 2/Layer 3 stretch, and DCI use cases
- Designed for 100% load under lossless conditions for AI training workloads
- Backward and forward compatible with 100G/200G/400G/800G interface configurations

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

Compatible with Arista 7808 chassis (8-slot modular system)
- Dimensions: 2.5" H x 21.5" W x 23.7" D (6.4 x 54.7 x 60.1 cm)
- Weight: 35.8 lbs (16.2 kg)
- Typical power consumption: 562W (max 936W)
- 8 hot-swappable, user-serviceable fan modules integrated
- Graceful degradation redundancy support
- Active-active fabric operation for redundancy
- Cell-based fabric architecture with 100% efficiency
- Supports 7800R4 line cards with 800GbE, 400GbE, and breakout configurations
- Hot-swappable design for zero-downtime maintenance
- Front-to-rear airflow optimized for data center cooling
- Requires 5 fabric modules per 7808 chassis bundle

FAQs

Q: What chassis is the DCS-7808R4-FM compatible with?
A: The DCS-7808R4-FM is designed exclusively for the Arista 7808 chassis, which is an 8-slot modular system with 2 supervisor slots and 8 line card slots. It requires 5 fabric modules per chassis for full redundancy and performance.

Q: Can I upgrade existing 7800R3 systems with R4 fabric modules?
A: Yes, Arista 7800R3 systems can be upgraded to 7800R4 specification by installing R4 fabric modules and compatible R4 line cards, providing investment protection and seamless migration to higher performance and density.

Q: What is the role of fabric modules in the 7800R4 architecture?
A: Fabric modules provide non-blocking interconnection between all line cards using a cell-based fabric architecture. They enable fully distributed end-to-end scheduling, ensuring 100% internally lossless operation with no packet drops, even under full utilization across all ports.

Q: How does redundancy work with the fabric modules?
A: The 7800R4 fabric modules operate in active-active mode and support graceful degradation. They can be hot-swapped without disrupting traffic, and the system maintains full performance with redundant fabric paths to ensure high availability.

Q: What cooling features are integrated in the DCS-7808R4-FM?
A: The module includes 8 individually serviceable, hot-swappable fan modules with intelligent thermal management. These support front-to-rear airflow optimized for data center environments while minimizing power consumption.

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