Information Technology

OSETC.027 explains 4–20 mA current loops, scaling, loop power, PLC analog inputs, calibrator modes, commissioning, and field troubleshooting.

Windows Command #32 explains net statistics, including Workstation and Server service counters, statistics windows, baseline capture, SMB troubleshooting, and safe interpretation.

Linux Command #42 explains groupmod: renaming groups, changing GIDs, checking identity dependencies, reviewing filesystem ownership, and validating group changes safely.

Python lesson on enums and named constants, covering Enum, auto, explicit values, StrEnum, IntEnum, dataclasses, pattern matching, parsing, serialization boundaries, and common enum mistakes.

Networking technician lesson on NAT and PAT, RFC 1918 private addressing, static and dynamic translation, NAT overload, translation state, port exhaustion, CGNAT, and troubleshooting.

History of money lesson on standardized coinage, Lydian electrum, weight standards, mints, fineness, seigniorage, debasement, counterfeiting, and the technology of monetary trust.

Firmware engineering lesson on real-time scheduling, superloops, RTOS task states, fixed priorities, preemption, context switching, WCET, blocking, priority inversion, jitter, and timing verification.

Firmware technician lesson on serial consoles, UART electrical levels, baud rate, 8N1 framing, pin identification, boot-log capture, reset causes, terminal tools, and recovery diagnostics.

Fiber optics engineering lesson on modal dispersion, chromatic dispersion, polarization-mode dispersion, pulse broadening, group delay, bandwidth-distance limits, compensation, and optical reach.

Fiber optics technician lesson on optical power meters, dBm, dB, wavelength selection, reference cords, transmitter output, receive power, insertion loss, calibration, and field documentation.

Data center engineering lesson on capacity planning, IT load, PUE, rack density, stranded capacity, growth headroom, AI power density, and maintenance-state constraints.

Data center technician lesson on rack power distribution, A/B source paths, rack PDUs, dual-corded IT equipment, load metering, three-phase balance, and safe fault isolation.