← Back
Home › Systems › Hardware and datacenter

optical-transceiver

pluggable and co-packaged optics for datacenter and AI fabrics: PAM4/coherent DSP, FEC, silicon photonics, CMIS firmware

800G/1.6T modules, 800ZR, NVIDIA CPO

SystemTechniques · 17Primitives · 70 optical-transceiver Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›A/B partition updatesembedded · medium: Two bootable slots and a small atomic metadata block: write the new image to the idle slot, try it once, and fall back by itself unless it reports healthy.›Coverage-guided fuzzingsecurity · medium: Mutate inputs, run an instrumented target, and keep any input that reaches a new code edge; feedback turns blind guessing into incremental search.›Coherent receiver dspsignal-processing · medium: Coherent receiver chain: dispersion compensation, polarization demux, frequency and carrier phase recoveryLdpc codessignal-processing · medium: Low-density parity-check codes with soft-decision min-sum decoding, used in NAND flashTime-series anomaly detectionstatistics · medium: Predict the expected value from a seasonal baseline, scale the residual by a robust spread (MAD), threshold at a chosen false-alarm rate, then merge flags into incidents.›CRC32C checksumshardware-os · low: The Castagnoli CRC-32 with dedicated instructions on x86 (SSE4.2) and ARMv8. It is the standard fast integrity check for storage blocks, logs and network frames.›Qam soft demappingsignal-processing · low: PSK/QAM constellation mapping and max-log LLR soft demapping for decodersHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesCmis management interfaceembedded · low: Common Management Interface Specification for pluggable modules: memory map, state machine, lane control over I2C/MDIOEdac memory scrubbingembedded · low: ECC/EDAC memory with periodic scrubbing to correct radiation-induced bit flipsFixed-rate control loopembedded · low: Run a controller at an exact period using absolute deadlines and a fixed dt, so jitter never accumulates and the math stays valid.›Link training autonegotiationembedded · low: Link bring-up: autonegotiation, equalisation tap training and lane training sequences before data modeSpi i2c bus driversembedded · low: SPI/I2C/UART peripheral drivers with interrupts, DMA and bus error recoveryProcess supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Fast Fourier transformnumerics · low: Computes the DFT in O(n log n) by recursively splitting into even and odd halves; the basis of fast convolution and spectral methods.›PID controllerrobotics · low: Drive a measured value to a setpoint with three terms on the error: proportional, integral, derivative. The default feedback loop for motors, heaters, drones and gimbals.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Adaptive equalizationsignal-processing · low: LMS/RLS equalizer filters that invert channel distortion from training or decisionsClock data recoverysignal-processing · low: Recover a sample clock and data from a high-speed serial stream with phase detectors and loop filtersLine coding scramblingsignal-processing · low: Scramblers and line codes (8b/10b, 64b/66b) for DC balance and clock recoveryReed-Solomon codessignal-processing · low: Byte-oriented MDS code: n-k parity symbols correct (n-k)/2 unknown symbol errors or n-k known erasures; the workhorse for bursts, QR codes, discs and storage.›+ 10 more techniques+ 54 more primitives

Similar systems

Share the most building blocks with this one.

hdd 38 %building-automation 28 %wearable-firmware 28 %infusion-pump 27 %fleet-patching 26 %