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Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. That does not establish physical corruption is occurring on the interface.

Collision or faulty hardware can create undersized frames. That does not establish physical corruption is occurring on the interface.

Frame and path MTU limits can drop oversized packets without changing higher-layer routes. The missing change involves physical corruption is occurring on the interface.

Identifying and removing the unauthorized endpoint then follow controlled recovery would not address the need for shorten the horizontal run or insert an appropriately designed intermediate switch.

Inspecting or replace the damaged cable and connectors after cable certification would not address the need for shorten the horizontal run or insert an appropriately designed intermediate switch.

Reterminate to a consistent T568A or T568B pinout preserving twisted pairs would not address the need for shorten the horizontal run or insert an appropriately designed intermediate switch.

No new violations and restored port show correct recovery. That check cannot demonstrate traffic delivery to healthy application targets.

Corrected physical link should stop accumulating CRC faults. That check cannot demonstrate traffic delivery to healthy application targets.

Pair testing distinguishes split pairs from open circuits. That check cannot demonstrate traffic delivery to healthy application targets.

Enabling the approved port after validating its intended use and security policy would not correct the fiber pair polarity so each TX reaches the remote RX.

Using an appropriately rated 802.3at or bt injector or switch per device requirements would not correct the fiber pair polarity so each TX reaches the remote RX.

Providing sufficient PoE capacity or redistribute loads across powered switches would not correct the fiber pair polarity so each TX reaches the remote RX.

Operational up state proves the administration fix. It does not measure light at receiving ports and verify link establishment.

Stable power at peak load validates capacity. It does not measure light at receiving ports and verify link establishment.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. It does not measure light at receiving ports and verify link establishment.

The powering standard cannot provide required watts. That does not establish restoration and verification of received optical light.

The switch's aggregate PoE budget is exceeded. That does not establish restoration and verification of received optical light.

A disabled interface cannot negotiate a physical link. That does not establish restoration and verification of received optical light.

Providing sufficient PoE capacity or redistribute loads across powered switches would not install compatible single-mode patch media and matching connectors.

Inspecting and clean connectors with approved fiber-safe procedures would not install compatible single-mode patch media and matching connectors.

Correcting the fiber pair polarity so each TX reaches the remote RX would not install compatible single-mode patch media and matching connectors.

Stable power at peak load validates capacity. That check cannot demonstrate restoration and verification of received optical light.

Supported inventory and link up confirm compatibility. That check cannot demonstrate restoration and verification of received optical light.

Measure negotiated PoE class and delivered watts under load. That check cannot demonstrate restoration and verification of received optical light.

The switch's aggregate PoE budget is exceeded. The missing change involves fiber type and optical module specifications mismatch.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. The missing change involves fiber type and optical module specifications mismatch.

The powering standard cannot provide required watts. The missing change involves fiber type and optical module specifications mismatch.

Installing compatible single-mode patch media and matching connectors would not provide sufficient PoE capacity or redistribute loads across powered switches.

Using an appropriately rated 802.3at or bt injector or switch per device requirements would not provide sufficient PoE capacity or redistribute loads across powered switches.

Reterminate to a consistent T568A or T568B pinout preserving twisted pairs would not provide sufficient PoE capacity or redistribute loads across powered switches.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. It does not inspect per-port PoE draw and total budget at full device count.

Measure negotiated PoE class and delivered watts under load. It does not inspect per-port PoE draw and total budget at full device count.

Pair testing distinguishes split pairs from open circuits. It does not inspect per-port PoE draw and total budget at full device count.