• 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, Slots 1-5

DCS-7808R4-FM

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Description

The DCS-7808R4-FM is a hot-swappable fabric module from the Arista 7800R4 Series, built for the 8-slot DCS-7808 modular chassis. It interconnects the line cards and supervisors in the cell-based, fully scheduled, lossless VOQ architecture, making it a core building block for AI/ML and HPC spine designs, data centre and service-provider core networks, and deep-buffer lossless routing.

The module fits fabric slots 1-5 of the DCS-7808 and is inserted from the rear of the chassis in a mid-plane-less design, giving direct and consistent connectivity from every line card to every fabric module. The cell-based fabric sprays uniform cells across all fabric links for 100% efficiency, and graceful degradation is supported if a module is removed. Typical power draw is 562 W, rising to 936 W at maximum, and each module carries 8 user-serviceable fan modules. It measures 2.5 x 21.5 x 23.7 in and weighs 35.8 lbs (16.2 kg).

This module is for the DCS-7808 chassis only. Fabric slot 6 requires the separate DCS-7808-FCM Fabric Cooling Module. The chassis also takes the 7800R4 line cards and the DCS-7800-SUP1S, DCS-7800-SUP1A, DCS-7808-SUP2 or DCS-7808-SUP2-N supervisors. No licence is required for the fabric module itself.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Hot-swappable fabric module with front-to-rear airflow
- Rear-inserted in a mid-plane-less design for direct, consistent connectivity from all line cards to all fabric modules
- Cell-based fabric sprays uniform cells across all fabric links for 100% efficiency
- Graceful fabric module redundancy
- Supports the 7800R4 fully scheduled, lossless VOQ architecture
- Ultra Ethernet-ready, AI/ML-optimised forwarding
- 8 user-serviceable fan modules

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

- Fabric module: DCS-7808R4-FM
- Chassis support: DCS-7808, fabric slots 1-5
- Redundancy: Graceful degradation supported
- Typical (max) power: 562 W (936 W), typical measured at 25C ambient with 50% load on all ports
- User-serviceable fans: Yes, 8 fan modules
- Dimensions (H x W x D): 2.5 x 21.5 x 23.7 in (6.4 x 54.7 x 60.1 cm)
- Weight: 35.8 lbs (16.2 kg)
- Operating temperature (7800R4 Series): 0 to 40 C (32 to 104 F)
- Storage temperature (7800R4 Series): -40 to 70 C (-40 to 158 F)
- Host chassis fabric module slots (DCS-7808): 6 (slots 1-5 fabric modules, slot 6 fabric cooling module)
- Host chassis maximum throughput (DCS-7808): 230 Tbps (460 Tbps FDX)
- Host chassis size (DCS-7808): 16 RU

FAQs

Q: Does this fabric module need a licence?
A: No licence is required for the fabric module itself. Software features on the chassis are delivered by Arista EOS on the supervisor.

Q: Which chassis and slots does it fit?
A: It is for the DCS-7808 chassis only and installs in fabric slots 1-5. Slot 6 requires the separate DCS-7808-FCM Fabric Cooling Module.

Q: How much power does it draw?
A: It draws 562 W typical and 936 W maximum from the chassis power budget. The DCS-7808 provides 12 PSU slots with a 36 kW maximum budget, supporting PWR-D1-3041-AC-BLUE, PWR-D2-3041-DC-BLUE and PWR-D4-3041-AC-BLUE power supplies.

Q: Which line cards and supervisors work with the 7808 chassis?
A: The 7808 chassis takes the 7800R4 line cards and the DCS-7800-SUP1S, DCS-7800-SUP1A, DCS-7808-SUP2 or DCS-7808-SUP2-N supervisors.

Q: Can it be replaced while the chassis is running?
A: Yes. All 7800R4 components, including fabric modules, are hot swappable, and graceful degradation is supported so the fabric keeps operating on the remaining modules.

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