Fluke DTX-1800 Technical Reference Handbook page 100

DTX Series CableAnalyzer
Technical Reference Handbook
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
Class for Permanent Link Test Limit
D
Test
NEXT
4 dB 4 dB
PS NEXT
4 dB 4 dB
ACR-N
4 dB 4 dB
PS ACR-N
4 dB 4 dB
ACR-F
PS ACR-F
Return Loss
3 dB 3 dB
3-14
E E F
A
4 dB 4 dB 4 dB
4 dB 4 dB 4 dB
4 dB 4 dB 4 dB
4 dB 4 dB 4 dB
70 dB 70 dB 70 dB
67 dB 67 dB 67 dB
3 dB 3 dB 3 dB
Table 3-3. dB Rules for Channel Test Limits
Test
NEXT
PS NEXT
ACR-N
F
PS ACR-N
A
ACR-F
PS ACR-F
Return Loss
Class for Channel Test Limit
D E E
A
4 dB 4 dB 4 dB
4 dB 4 dB 4 dB
70 dB 70 dB
67 dB 67 dB
3 dB 3 dB 3 dB
F F
A
4 dB 4 dB
4 dB 4 dB
70 dB
67 dB
3 dB 3 dB