Recently, many wiring experts talk about wiring test standards, said that the current due to the changes in the 5 cabling standards have led to many users of the relevant standards are still very confusing, here I will simply the wiring standards in the 5 categories of content changes to clarify, I hope to maintain and test the original wiring system to help people.
All originated from the support of Gigabit Ethernet on unshielded twisted-pair lines.
June 28, 1999, IEEE passed on the balanced twisted-pair cabling system (balance twisted pair cabling) On the support of Gigabit Ethernet IEEE802.3AB standards, because there was no 5e wiring standards, and the headache is as in the five categories of transmission Gigabit Ethernet is to be on the 4 line at the same time two-way transceiver signal will need to be installed at that time five types of cabling system to carry out a new transmission mode of the reassessment (or to say re-certification). This adds the following new metrics:
Delay Skew
Return Loss
Qual level Far End Crosstalk (elfext)
Ower Sum Equal level Far end Crosstalk (pselfext)
Tia/eia Cabling Workgroup released a technical bulletin: "TIA/EIA-TSB 95:additional transmission performance Guidelines for 100ω4-pair Category 5 Cabling ”。 The new parameters in TSB 95 are used by IEEE 802.3ab. The test parameters in this bulletin are proposed to be used to add new parameters to the five cabling systems that have been installed, so there is no improvement in the index, which is referred to as the new five-class standard.
Since TSB 95 is not a formal official standard, the TIA Committee considered that the wiring technology had been upgraded and that it was necessary to add a new attachment to the TAI-568A standard, and the more stringent 5e (i.e., super five) standards were born, This standard is recommended as the minimum requirement for a new installation system that transmits Gigabit Ethernet. The following standard compares five, five, and five categories from test parameters and metrics: (Computer science)
|
Category 5 |
TSB95 |
Category 5e |
Traditional Cat 5 |
"New" Cat 5 |
Enhanced Cat 5 |
Frequency Range |
1–100 MHz |
1–100 MHz |
1–100 MHz |
Propagation Delay |
Yes |
Yes |
= TSB95 |
Delay Skew |
|
Yes |
= TSB95 |
Attenuation |
Yes |
= Cat 5 |
= Cat 5 |
NEXT |
Yes |
= Cat 5 |
41% tighter |
Psnext |
|
|
Yes |
Elfext |
|
Yes |
5% tighter |
PS Elfext |
|
Yes |
= TSB95 |
Return Loss |
|
Yes |
26% tighter |
