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Selecting supported twinax direct-attach copper with matching transceiver ends would not match multimode-rated transceivers and fibers at both endpoints.

Replacing the patch cord with a properly keyed LC-to-LC cable for these ports would not match multimode-rated transceivers and fibers at both endpoints.

Using a manufacturer-supported QSFP module and matching link endpoints would not match multimode-rated transceivers and fibers at both endpoints.

Negotiated high-speed transfer validates the short DAC link. That check cannot demonstrate read module types and validate received signal on the installed multimode run.

Connector fit and received light validate the patch. That check cannot demonstrate read module types and validate received signal on the installed multimode run.

Negotiation demonstrates the physical module matches the port. That check cannot demonstrate read module types and validate received signal on the installed multimode run.

Reroute away from interference or use properly bonded shielded media as appropriate would not address the need for certify the copper run and replace cable failing the required category or resistance checks.

Selecting compatible single-mode fiber and long-reach optical modules with correct wavelengths would not address the need for certify the copper run and replace cable failing the required category or resistance checks.

Specifying locally compliant plenum-rated cable for that installation route would not address the need for certify the copper run and replace cable failing the required category or resistance checks.

Compare CRC counters with motors active after remediation. It does not measure voltage under peak AP load and run cable qualification.

Certification and pathway records establish code compliance. It does not measure voltage under peak AP load and run cable qualification.

An acceptable optical budget and error rate validate reach. It does not measure voltage under peak AP load and run cable qualification.

Electromagnetic interference is coupling into the copper cable. That does not establish cable loss or conductor condition prevents stable delivered power.

The jacket may not meet the building's plenum fire-smoke requirements.

Single-mode optics are designed for longer distances than typical short-reach multimode links. That does not establish cable loss or conductor condition prevents stable delivered power.

Specifying locally compliant plenum-rated cable for that installation route would not address the need for reroute away from interference or use properly bonded shielded media as appropriate.

Certify the copper run and replace cable failing the required category or resistance checks would not address the need for reroute away from interference or use properly bonded shielded media as appropriate.

Selecting compatible single-mode fiber and long-reach optical modules with correct wavelengths would not address the need for reroute away from interference or use properly bonded shielded media as appropriate.

Load test reveals power-delivery loss absent at idle. It does not compare CRC counters with motors active after remediation.

Certification and pathway records establish code compliance. It does not compare CRC counters with motors active after remediation.

Connector fit and received light validate the patch. It does not compare CRC counters with motors active after remediation.

The jacket may not meet the building's plenum fire-smoke requirements. The missing change involves electromagnetic interference is coupling into the copper cable.

Cable loss or conductor condition prevents stable delivered power. That does not establish electromagnetic interference is coupling into the copper cable.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. That does not establish electromagnetic interference is coupling into the copper cable.

Replacing the patch cord with a properly keyed LC-to-LC cable for these ports would not meet the need for a manufacturer-supported QSFP module and matching link endpoints.

Certify the copper run and replace cable failing the required category or resistance checks would not meet the need for a manufacturer-supported QSFP module and matching link endpoints.

Selecting compatible single-mode fiber and long-reach optical modules with correct wavelengths would not meet the need for a manufacturer-supported QSFP module and matching link endpoints.

Connector fit and received light validate the patch. That check cannot demonstrate read module inventory and verify negotiated lane rate and link status.

Load test reveals power-delivery loss absent at idle. That check cannot demonstrate read module inventory and verify negotiated lane rate and link status.

Negotiated high-speed transfer validates the short DAC link. That check cannot demonstrate read module inventory and verify negotiated lane rate and link status.

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work. The missing change involves transceiver form factor and lane capabilities are incompatible.

Cable loss or conductor condition prevents stable delivered power. The missing change involves transceiver form factor and lane capabilities are incompatible.

A short-reach direct attach option can meet the link requirement. The missing change involves transceiver form factor and lane capabilities are incompatible.