2025-12-08
Keystone Jack Reuse Practical Guide
Content
Plastic clips are intact (elastic rebound when pressed)
IDC wire slot metal pieces are flat (no warping or deformation)
RJ45 contact plating is not worn (uniform gold color, no black spots)
Only connected to standard PoE devices (≤30W)
Not exposed to water/oil corrosion
Wiring attempts ≤ 2 times (IDC blade lifespan limit)
Used with PoE++ power supply exceeding 60W (contacts yellowed and carbonized)
Used for outdoor surveillance (UV aging makes plastic brittle)
Plugged in and out more than 50 times (metal fatigue leading to poor contact)
Shielding Jack grounding tab broken (compromising anti-interference)
Use a small screwdriver to push the bottom tab (stop when you hear a "click")
Do not use pliers to pull forcefully (will break the cable)
Remove residual wire ends from the wiring slot with a needle
Avoid scratching the IDC metal pieces with the blade
| Step | Critical Actions | Emergency Tool Alternatives |
|---|---|---|
| Deep Cleaning | Gently wipe contacts with alcohol wipes | Use electronics spray + soft brush |
| Function Testing | Punch-down scrap cable → test continuity | Connect phone-to-RJ45 dongle |
| Protection Prep | Apply lube to plastic clips | Dab petroleum jelly (avoid contacts) |
Attach an orange label to the casing (indicating "Reused 1 time")
Mandatory disposal after more than 3 uses
Only used for non-critical equipment (such as conference room IP phones)
Not allowed for servers/security backbone networks
Reuse Jacks have a 30% higher failure rate
Keep spare new parts of the same model readily available for quick replacement
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