technology

OSFOEC.007 explains fiber nonlinearities in optical networks: Kerr effect, SPM, XPM, FWM, SBS, SRS, aggregate WDM power, effective area, and launch-power optimization.

Learn coherent optical transmission engineering from the ground up: I/Q modulation, QPSK and QAM, dual polarization, coherent receivers, DSP, OSNR, FEC, and the capacity-versus-reach tradeoff.

OSFOTC.007 teaches fiber cable installation and routing: bend radius, pulling tension, conduit and tray handling, figure-eight staging, slack, strain relief, labeling, inspection, and acceptance testing.

OSDCEC.008 covers data center water systems: closed and open cooling loops, cooling towers, makeup water, blowdown, cycles of concentration, water quality, WUE, leak risk, and dry-cooling tradeoffs.

OSSQL.002 teaches the SQL SELECT statement: result sets, select lists, choosing columns, SELECT *, FROM, expressions, duplicate values, row-order assumptions, and basic query reading.

Learn a practical data-center server provisioning workflow: identity checks, BIOS/UEFI, storage and RAID, PXE or installation media, operating-system deployment, firmware and drivers, validation, documentation, and handoff.

OSPHP.002 teaches PHP syntax fundamentals: PHP tags, statements, semicolons, echo, comments, whitespace, case sensitivity, short echo syntax, mixing PHP with HTML, and basic parse-error troubleshooting.

OSHTML.001 introduces HTML document structure: DOCTYPE, html, head, body, character encoding, title, headings, paragraphs, nesting, browser inspection, and validation.

OSPHP.001 introduces the PHP runtime: CLI execution, php -v, running PHP files, php -r, configuration, SAPIs, and PHP’s built-in development server.

OSPowerShell.001 introduces PowerShell cmdlets: Verb-Noun naming, Get-Verb, Get-Command, Get-Help, Get-Process, command types, discovery, syntax, and safe first troubleshooting.