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DESCRIPTION
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DESCRIPTION
Arista DCS-7800R4-36PE-LC – 36 x OSFP800 800GbE Line Card
The DCS-7800R4-36PE-LC is a 7800R4 Series line card with 36 OSFP800 ports, delivering 28.8 Tbps (57.6 Tbps full duplex) with a 32 GB deep packet buffer and latency from 3.8 microseconds. It is built for accelerated computing and data center fabrics, and installs in the DCS-7804, DCS-7808, DCS-7812, and DCS-7816L chassis.
Key Features
Ports: 36 x OSFP800 (800GbE)
Throughput: 28.8 Tbps (57.6 Tbps full duplex)
Latency: from 3.8 microseconds
Packet buffer: 32 GB
Encryption: None
FlexRoute: Standard
Accelerated sFlow: yes
Typical (max) power: 915 W typical (1110 W max)
Weight: 26.7 lbs (12.1 kg)
Dimensions (WxHxD): 18.9 x 2.1 x 17.8 in (48.1 x 5.4 x 45.2 cm)
Using breakout cables and appropriate transceivers (subject to EOS scale and transceiver capabilities), each card supports up to 36 x 800GbE, 72 x 400GbE, or 288 x 100GbE interfaces (maximum 288 total interfaces per card).Ordering note: this page covers the spare line card (DCS-7800R4-36PE-LC). Arista also lists a ships-in-chassis variant of the same card (DCS-7800R4-36PE-LC#).
7800R4: The 800G Generation
The 7800R4 Series extends the 7800 platform to 800GbE with the same fully scheduled, cell-based, internally lossless architecture – Virtual Output Queues, distributed credit scheduling, and deep buffering – purpose-built for AI/accelerated-computing clusters and next-generation data center and service provider cores. R4 systems use five R4 fabric modules (slots 1-5) plus a fabric cooling module (slot 6) per chassis.
Deployment Scenarios
AI and accelerated computing fabrics: lossless, fully scheduled forwarding for GPU cluster spine layers where in-cast and elephant flows overwhelm shallow-buffer switches
Data center interconnect and WAN edge: deep buffers absorb speed mismatches and long-haul burst patterns without drops
Service provider core and peering: FlexRoute and VOQ fabric handle full-table environments at the chassis level
Incremental scale-out: add cards to any populated 7800 chassis without forklift changes – all line cards are hot-insertable field-replaceable units
Choosing Among the Variants
Within the 7800R4 36PE family: the R4C is compute-optimized (lowest latency, no FlexRoute/traffic policies), the R4 adds standard FlexRoute for data center routing, and the R4K adds TunnelSec encryption capability on all ports (license-gated) plus a large-routes profile for service provider cores. All three share the same 36 x OSFP800 data plane, 32 GB buffer, and chassis support.
Frequently Asked Questions
Which chassis support the DCS-7800R4-36PE-LC?
The DCS-7800R4-36PE-LC installs in the Arista DCS-7804, DCS-7808, DCS-7812, and DCS-7816L chassis. It is a front-serviceable, hot-insertable module.
What is the port configuration of the DCS-7800R4-36PE-LC?
The DCS-7800R4-36PE-LC provides 36 x OSFP800 800GbE with 28.8 Tbps of throughput and a 32 GB deep packet buffer.
Does the DCS-7800R4-36PE-LC support encryption?
No – this variant has no port encryption hardware. The M (MACsec/TunnelSec) variants of the same card are encryption-capable; note that encryption operation requires the applicable Arista license.
Can I mix this card with other 7800 line cards in one chassis?
Yes. 7800 chassis accept any combination of supported line cards, so you can mix port speeds and generations as your fabric grows.
Is the refurbished DCS-7800R4-36PE-LC tested before shipping?
Yes. BrightStar Systems inspects and tests every unit on original-spec firmware, performs a factory reset and configuration wipe, and backs it with warranty (1 year end-user / 90 days reseller).
BrightStar Systems supplies professionally tested refurbished Arista 7800 Series hardware. Every unit is inspected, tested on original-spec firmware, factory reset, and configuration wiped before shipment, and backed by our standard warranty. Modular systems and line cards of this class are typically project-priced – request a quote for current availability and pricing.
