• Permanent links are those which typically run from wall plates to wiring closets or patch panels. Permanent links, as the name suggests, are intended to be the permanently installed part of the network infrastructure.
  • Channel link refers to the total cable run including permanent links and patch cables to hubs or switches.

Cat5 Cabling

Cat5 cables are specified at various frequencies throughout the range, at 1, 10, and 100Mhz. The following tables show the main performance requirements for Cat5 copper cables.

Permanent Links
FrequencyNEXT
1 Mhz60 dB
10 Mhz45.5 dB
100 Mhz29.3 dB
FrequencyPS_NEXT
1 MhzN/A
10 MhzN/A
100 MhzN/A
FrequencyELFEXT
1 Mhz57.7 dB
10 Mhz37 dB
100 Mhz17 dB
FrequencyPS-ELFEXT
1 MhzN/A
10 MhzN/A
100 MhzN/A
Channel Links
FrequencyNEXT
1 Mhz60 dB
10 Mhz44 dB
100 Mhz27.1 dB
FrequencyPS_NEXT
1 MhzN/A
10 MhzN/A
100 MhzN/A
FrequencyELFEXT
1 Mhz57 dB
10 Mhz37 dB
100 Mhz17 dB
FrequencyPS-ELFEXT
1 Mhz54.4 dB
10 Mhz34.4 dB
100 Mhz14.4 dB

Cat5e Cabling

Cat5e cables are specified at various frequencies throughout the range, at 1, 10, and 100Mhz. The following tables show the main performance requirements for Cat5e copper cables.

Permanent Links
FrequencyNEXT
1 Mhz60 dB
10 Mhz48.5 dB
100 Mhz32.3 dB
FrequencyPS_NEXT
1 Mhz57 dB
10 Mhz45.6 dB
100 Mhz29.3 dB
FrequencyELFEXT
1 Mhz58.6 dB
10 Mhz38.6 dB
100 Mhz18.6 dB
FrequencyPS-ELFEXT
1 Mhz55.6 dB
10 Mhz35.6 dB
100 Mhz15.6 dB
Channel Links
FrequencyNEXT
1 Mhz60 dB
10 Mhz47 dB
100 Mhz30.1 dB
FrequencyPS_NEXT
1 Mhz57 dB
10 Mhz44 dB
100 Mhz27.1 dB
FrequencyELFEXT
1 Mhz57.4 dB
10 Mhz37.4 dB
100 Mhz17.4 dB
FrequencyPS-ELFEXT
1 Mhz54.4 dB
10 Mhz34.4 dB
100 Mhz14.4 dB

Cat6 Cabling

Cat6 cables are specified at various frequencies throughout the range, at 1, 10, and 100Mhz. The following tables show the main performance requirements for Cat6 copper cables.

Permanent Links
FrequencyNEXT
1 Mhz65 dB
10 Mhz57.8 dB
100 Mhz41.8 dB
250 Mhz35.3 dB
FrequencyPS_NEXT
1 Mhz62 dB
10 Mhz55.5 dB
100 Mhz39.3 dB
250 Mhz32.7 dB
FrequencyELFEXT
1 Mhz64.2 dB
10 Mhz44.2 dB
100 Mhz24.2 dB
250 Mhz16.2 dB
FrequencyPS-ELFEXT
1 Mhz61.2 dB
10 Mhz41.2 dB
100 Mhz21.2 dB
250 Mhz13.2 dB
Channel Links
FrequencyNEXT
1 Mhz65 dB
10 Mhz56.6 dB
100 Mhz39.9 dB
250 Mhz33.1 dB
FrequencyPS_NEXT
1 Mhz62 dB
10 Mhz54 dB
100 Mhz37.1 dB
250 Mhz30.2 dB
FrequencyELFEXT
1 Mhz63.3 dB
10 Mhz43.3 dB
100 Mhz23.3 dB
250 Mhz15.3 dB
FrequencyPS-ELFEXT
1 Mhz60.3 dB
10 Mhz40.3 dB
100 Mhz20.3 dB
250 Mhz12.3 dB

Cable Length

The standard specifies a maximum length of 90 metres for Permanent links and 100 metres for Channel links. It is possible that everything will work with longer lengths, but if you want to be sure that your installations will remain compliant with future standards then you should never exceed 90 metre cable lengths.

Wiremapping

In all cases all the pins must be properly connected.

Propagation Delay

Permanent link propagation delay at 10Mhz must not be greater than 498 nanoseconds.

Channel link propagation delay at 10Mhz must not be greater than 555 nanoseconds.

Delay Skew

Permanent link delay skew at 10Mhz must not be greater than 44 nanoseconds.

Channel link delay skew at 10Mhz must not be greater than 50 nanoseconds.