• Gray metal arista dcs-7800r3a-36d2-lc server rack with black ventilation slots and mounting brackets shown from back side
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Arista

Arista DCS-7800R3A-36D2-LC | 7800R3A 36-Port 400G QSFP-DD Line Card, 16GB Buffer

DCS-7800R3A-36D2-LC

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Description

The 7800R3A 36-port 400GbE QSFP-DD line card is built for the Arista 7800R3 Series modular chassis. It suits large-scale layer 2 and layer 3 cloud data centres, overlay networks, internet peering and data centre interconnect, where deep buffers and non-blocking forwarding matter.

This model provides 36 QSFP-DD ports with 14.4 Tbps of throughput (28.8 Tbps full duplex) and a 16 GB port buffer. Breakout options allow up to 232 x 10G/25G/50G, 144 x 100G or 36 x 400G interfaces. It includes an onboard CPU and does not provide tunnel encryption, which separates it from the encrypting -36DM2 and -36DM2K variants. Typical power draw is 533 W, with a maximum of 779 W, excluding optics.

It fits the DCS-7816L, DCS-7816, DCS-7812, DCS-7808 and DCS-7804 chassis and requires the matching 7800R3 fabric modules and a supervisor module. The QSFP-DD ports support 400GBASE-CR8, AOC, SR8, DR4, XDR4, FR4, LR4, PLR4 and ZR optics, as well as 200G and 100G breakout and 25G breakout to SFP cables.

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

Features

- Fully scheduled distributed virtual output queue (VOQ) architecture with a lossless fabric that eliminates head-of-line blocking
- Deep buffering absorbs incast, bursts and speed mismatches without packet loss
- Standards-based QSFP-DD 400G interfaces supporting 50G, 100G and 200G speeds
- Hot-swappable modular design alongside redundant supervisor, power, fabric and cooling modules
- Runs Arista EOS with a Linux shell, Zero Touch Provisioning, LANZ and DANZ monitoring
- Large L2/L3 table scale with profiles for internet peering and data centre interconnect
- QoS, ECN marking, MPLS and segment routing, and VXLAN overlay support through EOS

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

- Model: 7800R3A-36D2
- Ports: 36x 400G QSFP-DD
- Throughput: 14.4 Tbps (28.8 Tbps full duplex)
- Port buffer: 16 GB
- Encryption: None
- CPU: Onboard CPU included
- Maximum interfaces: 232 x 10G/25G/50G, 144 x 100G or 36 x 400G (breakout dependent)
- Maximum 40G interfaces (using QSFP+): 36
- Typical power: 533 W (maximum 779 W), excluding optics
- 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: 11.73 kg (25.85 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 (0 to 10,000 ft)
- Chassis support: DCS-7816L, DCS-7816, DCS-7812, DCS-7808, DCS-7804

FAQs

Q: Which chassis does this line card fit?
A: It fits the Arista 7800R3 Series chassis: DCS-7816L, DCS-7816, DCS-7812, DCS-7808 and DCS-7804. It also needs the matching 7800R3 fabric modules and a supervisor module.

Q: Does this line card support tunnel encryption?
A: No. The 7800R3A-36D2 has no encryption. The -36DM2 and -36DM2K variants are the encrypting versions.

Q: What power does it draw from the chassis?
A: Typical draw is 533 W and the maximum is 779 W per line card, excluding optics. The chassis supplies this through its redundant hot-swappable 3000W AC or DC power supplies.

Q: Which optics and cables work in the QSFP-DD ports?
A: The ports support 400GBASE-CR8 (1-2.5m), AOC (1-30m), SR8 (100m), DR4 (500m), XDR4 (2km), FR4 (2km), LR4 (10km), PLR4 (10km) and ZR (120km with amplification). 200G and 100G breakout and 25G breakout to SFP cables are also supported.

Q: Does it need a separate hardware licence?
A: No separate hardware licence is stated for the card. It runs standard Arista EOS, and some advanced EOS features may require feature licences.

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