關於802.3u快速乙太網路規範(快速鏈路脈衝)

Fast Link Pulse

Auto-Negotiation takes place using Fast
Link Pulse (FLP) signals. These signals are a modified version of the Normal Link Pulse (NLP) signals used for verifying link integrity, as defined in the original 10BASE-T specifications. The FLP signals are generated automatically at power-up, or may be
selected manually through the management interface to an Auto-Negotiation device.

The Fast Link Pulse signals are designed to coexist with NLP signals, so that a 10BASE-T device that uses NLP signals will continue to detect the proper link integrity even when attached to an Auto-Negotiation hub that sends FLP signals. Like the original 10BASE-T
link pulse, the FLP signals take place during idle times on the network link and do not interfere with normal traffic. Note that both Normal Link Pulses and Fast Link Pulses are specified only for twisted-pair media using eight-pin connectors, such as 100BASE-TX
over unshielded twisted-pair. This means that network devices and repeater ports linked over fiber optic segments cannot participate in Auto-Negotiation.

The FLP signals are used to send information about device capabilities. The Auto-Negotiation protocol contains rules for device configuration based on this information. This is how a hub and the device attached to that hub can automatically negotiate and configure
themselves to use the highest performance mode of operation.

The Auto-Negotiation feature is optional, and therefore the Auto-Negotiation protocol is designed to work with 100BASE-T interfaces that do not support Fast Link Pulses and Auto-Negotiation as well as older 10BASE-T interfaces that were built before Auto-Negotiation
existed. The Auto-Negotiation system includes an optional management interface that allows you to disable Auto-Negotiation, or to manually force the negotiation process to take place. The management interface allows you to manually select a specific operational
mode for a given hub port.

  以上是我找到的一篇英文文檔,翻譯如下:   (快速乙太網路)自動協商利用快速鏈路脈衝訊號(FLP),是一般鏈路脈衝訊號(NLP)的一個變化版本.NLP被用作於校檢鏈路的完整性,最先被定義於10Base-T規範手冊.FLP訊號一般在電源啟動時自動進行協商,也可以手動對自動協商裝置的管理介面進行配置.  FLP被設計於與NLP訊號共存,所以當一個10Base-T裝置被連上於一個發送FLP訊號進行自動協商的集線器時,它會繼續發送NLP來檢察鏈路的完整性.像10Base-T協商一樣,FLP協商訊號發生在鏈路的空閑時間,並不會干擾正常的流量通訊.我們注意到,無論是NLP還是FLP,都只是被專用於8線連接器的雙絞線介質,如100Base-TX的UTP.這就意味著串連著光纖段的網路裝置和轉送連接埠不能進行自動協商.  FLP訊號被用作於發送裝置容量資訊.自動協商包含的規則是利用這些資訊對裝置進行配置.這就是為什麼當一個裝置和hub相連時,hub能夠自動協商並配置他們之間使用最高速率執行模式.  自動協商功能是可選的,因此自動協商協議被設計於100Base-T介面而並不對在自動協商協議產生之前的10Base-T介面提供FLP和自動協商.自動協商系統包括一個可選的管理介面從而允許你關閉自動協商或者手動強制協商進行.管理介面允許手動選擇一個明確的操作模式作用於某個hub口.                                                                                            by:troy 

文章引用自：http://www.ethermanage.com/ethernet/100quickref/ch13qr_3.html#HEADING2