Fluke Networks CertiFiber Pro Users Manual - Manual (Page 143)

Chapter 3: How to Certify Twisted Pair Cabling
About dB Rules
121
Table 6. dB Rules for ISO Channel Test Limits
Measurement Class D Class E Class E
A
Class F Class F
A
Return Loss 1 3 dB 3 dB 3 dB 3 dB 3 dB
NEXT 2 4 dB 4 dB 4 dB 4 dB 4 dB
PS NEXT 2 4 dB 4 dB 4 dB 4 dB 4 dB
ACR-F 3 70 dB 70 dB 70 dB
ACR-F 4 65 dB 65 dB 65 dB
PS ACR-F 5 67 dB 67 dB 67 dB
PS ACR-F 6 62 dB 62 dB 62 dB
1. If insertion loss is less than 3 dB, Return Loss measurements are ignored.
2. If insertion loss is less than 4 dB, these measurements are ignored.
3. If FEXT is less than 70 dB, ACR-F measurements are ignored.
4. If the calculation of the FEXT limit value at a frequency is more than 65 dB, then the
limit at that frequency is 65 dB.
5. If PSFEXT is less than 67 dB, PS ACR-F measurements are ignored.
6. If the calculation of the PSFEXT limit value at a frequency is more than 62 dB, then the
limit at that frequency is 62 dB.