Users Manual Owner manual

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.