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฀ Qualifying฀Cabling฀with฀the฀Autotest฀฀ ฀
29฀
Tip:฀To฀determine฀if฀a฀fault฀is฀caused฀by฀a฀crosstalk฀or฀
impedance฀problem,฀use฀the฀Find฀Crosstalk฀Fault฀and฀
Find฀Impedance฀Fault฀functions฀in฀Diagnostic฀(DIAG)฀
mode.฀
• Fault฀detected:฀A฀localized฀impedance฀fault฀was฀
detected.฀Localized฀faults฀are฀usually฀caused฀by฀bad฀
connections.฀Check฀the฀cabling฀at฀the฀location฀given.฀
See฀the฀Appendix฀for฀other฀causes฀of฀impedance฀faults.฀฀
• Fault฀at฀connection฀to฀tester:฀The฀plug฀connected฀to฀the฀
tester฀is฀bad,฀or฀the฀tester’s฀connector฀is฀damaged.฀
• Insertion฀loss฀fault:฀The฀cabling’s฀attenuation฀is฀too฀
high.฀See฀the฀Appendix฀for฀causes฀of฀insertion฀loss฀
problems.฀
• 1000BASE-T฀bandwidth฀fault:฀The฀cable฀has฀high฀
ELFEXT฀(equal-level฀far-end฀crosstalk).฀This฀may฀be฀
caused฀by฀poor-quality฀cable฀or฀connecting฀hardware.฀
See฀the฀Appendix฀for฀other฀causes฀of฀ELFEXT฀faults.฀
Figure฀11.฀Signal฀Performance฀Results฀(cont.)฀