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DESCRIPTION
SPECIFICATIONS
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DESCRIPTION
Arista DCS-7800R3-48CQM-LC – 48 x QSFP100 100GbE Line Card
The DCS-7800R3-48CQM-LC is a 7800R3 line card for the Arista 7800R3 Series modular systems, delivering 4.8 Tbps (9.6 Tbps full duplex), wirespeed with an 8 GB deep packet buffer per card. It installs in any 7800R3 chassis (7804 through 7816L) and is built for 100GbE aggregation and spine roles.
Key Features
Ports: 48 x QSFP100 100GbE
Throughput: 4.8 Tbps (9.6 Tbps full duplex), wirespeed
Packet buffer: 8 GB
Encryption: MACsec on all ports (40G modes excluded) (hardware-capable; encryption operation requires the applicable Arista license)
Typical (max) power: 620 W typical (684 W max)
Weight: 20 lbs (9.1 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), maximum port counts per card are: 48 x 40GbE (QSFP+), 48 x 100GbE. Maximum total interfaces per card: 48.
Fully Scheduled Lossless Architecture
The 7800R3 platform is a purpose-built multi-chip system with end-to-end scheduling: a cell-based fabric sprays uniform cells across all fabric links, Virtual Output Queues eliminate head-of-line blocking, distributed credit scheduling keeps every egress port independent, and deep buffers absorb in-cast and bursts without packet loss. Even the largest 16-slot, 576 x 400GbE configuration behaves like a single, internally lossless switching chip – ideal for AI clusters, cloud data centers, and service provider cores.
Deployment Scenarios
High-density aggregation: consolidating 10/25/40/50G leaf and server links into a scheduled, lossless spine
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
7800R3 naming decodes as follows: M adds MACsec/TunnelSec encryption capability (license-gated), K adds the large-routes resource profile, a trailing 2 adds an on-card CPU, and R3A cards use a newer ASIC generation with 16 GB buffers versus 24 GB on the wirespeed R3 cards (48CQ family: 8 GB). Pick the plainest variant that meets your encryption and route-scale needs – the premium features carry price and power costs.
Frequently Asked Questions
Which chassis support the DCS-7800R3-48CQM-LC?
The DCS-7800R3-48CQM-LC installs in the Arista DCS-7804, DCS-7808, DCS-7812, DCS-7816, and DCS-7816L chassis. It is a front-serviceable, hot-insertable module.
What is the port configuration of the DCS-7800R3-48CQM-LC?
The DCS-7800R3-48CQM-LC provides 48 x QSFP100 100GbE with 4.8 Tbps of throughput and an 8 GB deep packet buffer.
Does the DCS-7800R3-48CQM-LC support encryption?
The DCS-7800R3-48CQM-LC is hardware-capable of MACsec on all ports (40G modes excluded). Encryption operation requires the applicable Arista license (LIC-MOD series) – confirm licensing for your deployment.
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-7800R3-48CQM-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.
SPECIFICATIONS
Model: DCS-7800R3-48CQM-LC
Type: 7800R3 Series line card for 7800R3 modular systems
