LDA D6 Mark II

Layer 1 Server Add-on

With sub-nanosecond roundtrip latency, the D6 is the lowest latency Layer 1 switching product available today.

The D6 Mark II is a PCIe card that provides Layer 1 switching with sub-nanosecond roundtrip latency. The card has one QSFP and two QSFPDD ports at the front, and three AcceleRate® Slim Sockets at the back: providing a total of 44 10G lanes with full mesh interconnect.

The D6 Mark II seamlessly integrates with the LDA Unity platform or your existing infrastructure, improving performance and productivity. With its AcceleRate sockets, the D6 Mark II can easily connect to other FPGA boards in the same server, expanding your capabilities with a Layer 1 fabric. Additionally, you can interconnect multiple D6 Mark II cards to form a daisy chain of Layer 1 fabrics. .

Product Highlights

  • Down to 800 picoseconds roundtrip latency.
  • 2x QSFP DD and 1x QSFP ports.
  • 3x AcceleRate Slim Socket connectors.
  • Full mesh Layer 1 replication for 44 12.5 Gbps lanes.

Per-Port Latency

The table below contains per-port per-lane per-direction latency. To get the latency of a particular route, take the RX latency of the source port (incoming lane) and the TX latency of the destination port (outgoing lane) and add them together.

All measurements were performed with 31ps accuracy using LDA's Time-Of-Flight Latency Measurement solution.

Port Lane RX Latency (ns) TX Latency (ns)
QSFP Lane 1 0.5315 0.5345
Lane 2 0.5480 0.5510
Lane 3 0.5965 0.5995
Lane 4 0.5965 0.5995
QSFP DD (Mid) Lane 5 0.3705 0.3735
Lane 6 0.3545 0.3575
Lane 7 0.3545 0.3575
Lane 8 0.3540 0.3570
Lane 9 0.3700 0.3730
Lane 10 0.3705 0.3735
Lane 11 0.3705 0.3735
Lane 12 0.3220 0.3250
QSFP DD (Top) Lane 13 0.4190 0.4220
Lane 14 0.4835 0.4865
Lane 15 0.4995 0.5025
Lane 16 0.4835 0.4865
Lane 17 0.4350 0.4380
Lane 18 0.4025 0.4055
Lane 19 0.4835 0.4865
Lane 20 0.4670 0.4700

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