• Silver-colored arista dcs-7800r4c-36pe-lc rack-mounted network switches with 36 ports and ventilation slots visible
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Arista

Arista DCS-7800R4C-36PE-LC | 7800R4 36-Port 800G OSFP Line Card, Compute-Optimised

DCS-7800R4C-36PE-LC

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Description

The 7800R4C-36PE is a 36-port 800GbE OSFP line card for the Arista 7800R4 series modular chassis. It is the compute-optimised variant, aimed at AI/ML back-end and front-end interconnects, HPC and accelerated computing clusters, and single-tier fabrics for small and medium AI deployments. In 2-tier or 3-tier leaf-spine designs it scales to very large accelerator counts.

Each card provides 36 OSFP800 ports, configurable as up to 36 x 800G, 72 x 400G or 288 x 100G interfaces, with 28.8 Tbps of throughput (57.6 Tbps full duplex) and 32 GB of port buffer. It uses a fully scheduled, lossless, cell-based VOQ fabric with latency from 2.8 microseconds, the lowest of the three 7800R4 line card types. This card does not include FlexRoute, traffic policies or TunnelSec encryption, which sit on the 7800R4-36PE and 7800R4K-36PE cards. It draws a typical 904 W and a maximum of 1088 W, excluding optics.

It fits the DCS-7804, DCS-7808, DCS-7812 and DCS-7816L chassis alongside the 7800R4 fabric modules, fabric cooling modules and supervisor modules. This is the spare line card part number (without the # suffix).

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

Features

- Fully scheduled, lossless, cell-based VOQ fabric with a distributed hardware scheduler
- Per-port Virtual Output Queuing to eliminate head-of-line blocking
- Under 3 microsecond latency (64 bytes)
- Ultra Ethernet ready
- Arista Etherlink for AI: AI Analyzer powered by AVA, advanced RDMA load balancing, optimised DCQCN, ECN and PFC congestion management
- Hardware-accelerated link health management
- Supports linear-drive pluggable optics (LPO) for power efficiency
- Hot-swappable modules with redundant supervisor, power, fabric and cooling
- Runs Arista EOS with CloudVision, LANZ microburst detection, ZTP, accelerated sFlow and IEEE 1588 PTP

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

- Ports: 36 x OSFP800
- Maximum 800G interfaces: 36
- Maximum 400G interfaces: 72
- Maximum 100G interfaces: 288
- Throughput: 28.8 Tbps (57.6 Tbps full duplex)
- Latency: from 2.8 microseconds
- Port buffer: 32 GB
- Use case: Accelerated Computing
- FlexRoute: not included
- Traffic policies: not included
- Encryption: none
- Accelerated sFlow: Yes
- Typical power: 904 W (25C ambient, 50% load, excluding optics)
- Maximum power: 1088 W
- Chassis support: DCS-7816L, DCS-7812, DCS-7808, DCS-7804
- Dimensions (W x H x D): 48.1 x 5.4 x 45.2 cm (18.9 x 2.1 x 17.8 in)
- Weight: 12.1 kg (26.7 lbs)
- Operating temperature: 0 to 40 C (32 to 104 F)
- Storage temperature: -40 to 70 C (-40 to 158 F)
- Relative humidity: 5 to 90%
- Operating altitude: 0 to 3,000 m (10,000 ft)
- Certifications: RCM, FCC Class A, CE, UKCA, VCCI, NRTL, KCC, BSMI, TEC, ANATEL, ICASA, NOM

FAQs

Q: Which chassis does this line card fit?
A: It fits the Arista DCS-7804, DCS-7808, DCS-7812 and DCS-7816L chassis, used with the 7800R4 fabric modules, fabric cooling modules and supervisor modules.

Q: How does it differ from the 7800R4-36PE and 7800R4K-36PE line cards?
A: This compute-optimised card has the lowest latency of the three types, from 2.8 microseconds. It has no FlexRoute, traffic policies or TunnelSec encryption, which are on the 7800R4-36PE (standard FlexRoute) and 7800R4K-36PE (large scale FlexRoute and TunnelSec).

Q: What port speeds and densities does it support?
A: The 36 OSFP800 ports can run in 800G, 400G, 200G and 100G modes using breakout cables or transceivers, up to 36 x 800G, 72 x 400G or 288 x 100G interfaces per card.

Q: How much power does it draw?
A: A typical 904 W and a maximum of 1088 W per line card at 25C ambient with 50% load, excluding optics. It is powered from the chassis power supplies.

Q: What is the difference between the LC and LC# part numbers?
A: DCS-7800R4C-36PE-LC is the spare line card part number. The LC# variant is the part number used when the card ships installed in a chassis.

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