Why Equipment Has a Weakest Link: Power Supplies, Capacitors and Long-Term Reliability
Understand the weakest-link analogy, supply paths, capacitor aging and cooling, and why MTBF or one thermal image cannot guarantee equipment lifetime.
What Does a Switch Do? From MAC Address Learning to VLAN Forwarding
Follow source-MAC learning, destination lookup and VLAN forwarding. Distinguish unknown-unicast flooding, routing and loop protection when accepting an industrial switch.
OTDR Fiber Faults: Return Light, Events and Dead Zones
Read OTDR return light, trace events and dead zones. Use suitable launch/receive fibers and complementary loss tests before declaring a repaired fiber link acceptable.
How Ethernet Port Transformers Pass Signals Across Electrical Isolation
See how Ethernet transformers carry changing signals without direct winding contact. Distinguish isolation, differential rejection and equipment-level interference limits.
Serial Device Servers and TCP Streams: Why Reads Split or Combine Messages
Separate UART characters, server buffering and TCP byte-stream reads. Build a persistent protocol parser and verify split, combined and incomplete messages through recovery.
