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Telecom
fiber-access
fiber access network
GPON
System
Techniques · 2
Primitives · 17
fiber-access
Clock synchronization
distributed · medium: Estimate a clock's offset from four timestamps, filter out queueing noise, and steer the clock smoothly; NTP gets about a millisecond, PTP with hardware timestamps under a microsecond.
›
Dynamic bandwidth allocation
signal-processing · medium: Grant-based upstream scheduling in shared-medium networks (PON, DOCSIS) from queue reports
Fair queuing
networking · low: Deficit round robin / weighted fair queuing to share capacity among tenants or flows
Token bucket
systems · low: A bucket of up to b tokens refilled at rate r; requests spend tokens, enforcing an average rate while allowing bursts of b.
›
CRC32C checksums
hardware-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.
›
Ethernet switching mac learning
networking · low: Ethernet bridging: MAC learning tables, VLAN tagging, flooding and aging
Multicast igmp snooping
networking · low: IGMP/MLD snooping to forward multicast only to subscribed ports
AEAD (AES-GCM, ChaCha20-Poly1305)
security · low: Authenticated encryption that encrypts and detects tampering in one call; the only kind of symmetric encryption you should use.
›
Line coding scrambling
signal-processing · low: Scramblers and line codes (8b/10b, 64b/66b) for DC balance and clock recovery
Ranging and delay equalization
signal-processing · low: Measure round-trip delay per endpoint and equalize it so upstream bursts do not collide
Reed-Solomon codes
signal-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.
›
Hierarchical state machine
systems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.
›
PID controller
robotics · 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.
›
Phase-locked loop (digital)
signal-processing · low: Feedback loop that locks a local oscillator to the phase and frequency of an input tone; the core of carrier recovery, clock recovery and GNSS tracking.
›
Robust statistics
statistics · low: Location and scale estimates (median, MAD, trimmed mean, Huber M-estimator) that stay correct when a minority of the data is garbage.
›
Tdma scheduling
signal-processing · low: Time-slot scheduling of shared radio links among users/beams
SIMD programming
hardware-os · low: Process 4-16 lanes per instruction with AVX2, AVX-512 or NEON via Rust std::arch, with runtime dispatch and a portable fallback.
›
Constant time code
security · low: Writing secret-dependent code without branches or memory lookups on secrets; constant-time compare and select
+ 1 more primitives
System
Techniques · 2
Primitives · 17
fiber-access
Clock synchronization
distributed · medium: Estimate a clock's offset from four timestamps, filter out queueing noise, and steer the clock smoothly; NTP gets about a millisecond, PTP with hardware timestamps under a microsecond.
›
Dynamic bandwidth allocation
signal-processing · medium: Grant-based upstream scheduling in shared-medium networks (PON, DOCSIS) from queue reports
Fair queuing
networking · low: Deficit round robin / weighted fair queuing to share capacity among tenants or flows
Token bucket
systems · low: A bucket of up to b tokens refilled at rate r; requests spend tokens, enforcing an average rate while allowing bursts of b.
›
CRC32C checksums
hardware-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.
›
Ethernet switching mac learning
networking · low: Ethernet bridging: MAC learning tables, VLAN tagging, flooding and aging
Multicast igmp snooping
networking · low: IGMP/MLD snooping to forward multicast only to subscribed ports
AEAD (AES-GCM, ChaCha20-Poly1305)
security · low: Authenticated encryption that encrypts and detects tampering in one call; the only kind of symmetric encryption you should use.
›
Line coding scrambling
signal-processing · low: Scramblers and line codes (8b/10b, 64b/66b) for DC balance and clock recovery
Ranging and delay equalization
signal-processing · low: Measure round-trip delay per endpoint and equalize it so upstream bursts do not collide
Reed-Solomon codes
signal-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.
›
Hierarchical state machine
systems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.
›
PID controller
robotics · 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.
›
Phase-locked loop (digital)
signal-processing · low: Feedback loop that locks a local oscillator to the phase and frequency of an input tone; the core of carrier recovery, clock recovery and GNSS tracking.
›
Robust statistics
statistics · low: Location and scale estimates (median, MAD, trimmed mean, Huber M-estimator) that stay correct when a minority of the data is garbage.
›
Tdma scheduling
signal-processing · low: Time-slot scheduling of shared radio links among users/beams
SIMD programming
hardware-os · low: Process 4-16 lanes per instruction with AVX2, AVX-512 or NEON via Rust std::arch, with runtime dispatch and a portable fallback.
›
Constant time code
security · low: Writing secret-dependent code without branches or memory lookups on secrets; constant-time compare and select
Csprng
security · low: OS-backed cryptographically secure random numbers (getrandom), and when a fast PRNG is not enough
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