Cable testing should be performed on both runs before replacing hardware. A failed injector swap that doesn't fix the issue points to the cable. Perimeter pole runs are the highest-risk for damage.
Wire map showing an open on pins 3 & 6 (blue pair, T568B) with a good-looking field run is a strong indicator of a bad punch-down at the patch panel — not a damaged cable. Always inspect the panel before pulling wire.
arp -a or Angry IP Scanner to check. IP conflicts cause intermittent camera drops.ping -t <camera IP> — watch for intermittent drops (cable / injector issue indicator)Client has been using individual PoE injectors instead of a PoE-capable switch. Document injector history and present the cost comparison to support switch upgrade recommendation.
Before closing the work order, have the client contact or on-site security team confirm all cameras are operational and undisturbed. This protects both the client and Five 9s in the event of any dispute after departure.