A network administrator is troubleshooting an intermittent physical layer failure on a newly provisioned 90-meter Category 6A unshielded twisted-pair (UTP) link connecting a core switch to a server farm switch. A standard continuity test verifies 1-to-1 pin mapping with no opens or shorts. However, when the link auto-negotiates to 10GBASE-T, the switch interfaces report extremely high cyclic redundancy check (CRC) error counts and dropped frames, whereas forcing the link speed down to 1000BASE-T yields stable performance. Which diagnostic tool should the administrator use to pinpoint the exact location and nature of this signal degradation along the cable run?
- A cable certifier capable of measuring frequency-dependent parameters such as Near-End Crosstalk (NEXT) and return loss across the cable lengthCevap
- BA basic wiremap continuity tester to detect pinout misconfigurations and crossed pairs
- CA tone generator and inductive probe kit to track the path of the physical cable run through wall conduits
- DAn optical power meter to measure the decibel signal attenuation level across the physical link
Cevap
A cable certifier capable of measuring frequency-dependent parameters such as Near-End Crosstalk (NEXT) and return loss across the cable length
High-speed transmission standards such as 10GBASE-T over Cat 6A operate at high frequencies (up to 500 MHz). Physical installation flaws such as untwisting wire pairs too far during punch-down or exceeding bend radii cause high-frequency impairments like Near-End Crosstalk (NEXT) and return loss. A cable certifier performs full parametric frequency sweeps and time-domain analysis to pinpoint exact failure points along the cable run.
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Anahtar Kavram
Cable certification and frequency-dependent parametric testing for high-speed copper links