Fluke DTX-1800, Technical Reference Handbook

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DTX Series CableAnalyzer
Technical Reference Handbook
3-14
70 dB Rule
This rule applies to any channel or permanent link test limit
where ACR-F is measured.
At frequencies where FEXT is less than 70 dB, ACR-F cannot
fail.
Table 3-2. dB Rules for Permanent Link Test Limits
Table 3-3. dB Rules for Channel Test Limits
Test
Class for Permanent Link Test Limit
D E E
A
F F
A
NEXT
4 dB 4 dB 4 dB 4 dB 4 dB
PS NEXT
4 dB 4 dB 4 dB 4 dB 4 dB
ACR-N
4 dB 4 dB 4 dB 4 dB 4 dB
PS ACR-N
4 dB 4 dB 4 dB 4 dB 4 dB
ACR-F
70 dB 70 dB 70 dB
PS ACR-F
67 dB 67 dB 67 dB
Return Loss
3 dB 3 dB 3 dB 3 dB 3 dB
Test
Class for Channel Test Limit
D E E
A
F F
A
NEXT
4 dB 4 dB 4 dB 4 dB 4 dB
PS NEXT
4 dB 4 dB 4 dB 4 dB 4 dB
ACR-N
PS ACR-N
ACR-F
70 dB 70 dB 70 dB
PS ACR-F
67 dB 67 dB 67 dB
Return Loss
3 dB 3 dB 3 dB 3 dB 3 dB