摘要: There has been much recent work in IEEE 802.3an, TIA TR42.7, and other standards groups to quantify channel capacity of unshielded twisted pair (UTP) media. While internal transmission impairments of UTP media such as Return Loss ... 展开 There has been much recent work in IEEE 802.3an, TIA TR42.7, and other standards groups to quantify channel capacity of unshielded twisted pair (UTP) media. While internal transmission impairments of UTP media such as Return Loss (RL), Near End CrossTalk (NEXT), and Far End CrossTalk (FEXT) are substantially cancelable with digital signal processing (DSP), alien crosstalk (PSANEXT and PSAELFEXT) remains a limiting factor for channel capacity. Many technical contributions have examined cable or connector alien crosstalk but few have quantified the channel alien crosstalk in installed cabling. This paper will present the results of alien crosstalk field testing in three installation sites. The sites utilize different vendor components for Category 6 rated solutions. Testing and analysis associated with this paper can support the standardization efforts in IEEE and TIA. 收起