Cable Diagnostics The KSZ8862M Lin" />
參數(shù)資料
型號(hào): KSZ8862-16MQL
廠商: Micrel Inc
文件頁數(shù): 47/125頁
文件大小: 0K
描述: IC SWITCH 10/100 16BIT 128-PQFP
標(biāo)準(zhǔn)包裝: 66
系列: KSZ8862
控制器類型: 以太網(wǎng)開關(guān)控制器
接口: PCI
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應(yīng)商設(shè)備封裝: 128-PQFP(14x20)
包裝: 托盤
配用: 576-1638-ND - BOARD EVALUATION KSZ8862-10FL
576-1637-ND - BOARD EVALUATION KSZ8862-100FX
其它名稱: 576-1564
Micrel, Inc.
KSZ8862-16/32MQL
April 2007
28
M9999-040407-3.0
LinkMD
Cable Diagnostics
The KSZ8862M LinkMD
uses Time Domain Reflectometry (TDR) to analyze the port 2 cabling plant for common cabling
problems such as open circuits, short circuits, and impedance mismatches.
LinkMD
works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs and then analyzes
the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault with a
maximum distance of 200m and an accuracy of +/–2m. Internal circuitry displays the TDR information in a user-readable
digital format in register P2VCT [8:0].
Note: cable diagnostics are only valid for copper connection (port 2) –fiber-optic operation is not supported.
Access
LinkMD
is initiated by accessing register P2VCT, the LinkMD Control/Status register, in conjunction with register
P2CR4, the 100BASE-TX PHY Controller register.
Usage
LinkMD
can be run at any time by making sure Auto MDIX has been disabled. To disable Auto-MDIX, write a ‘1’ to
P2CR4 [10] for port 2 to enable manual control over the pair used to transmit the LinkMD
pulse. The self-clearing cable
diagnostic test enable bit P2VCT [15] for port 2, is set to ‘1’ to start the test on this pair.
When bit P2VCT [15] returns to ‘0’, the test is complete. The test result is returned in bits P2VCT [14:13] and the distance
is returned in bits P2VCT [8:0]. The cable diagnostic test results are as follows:
00 = Valid test, normal condition
01 = Valid test, open circuit in cable
10 = Valid test, short circuit in cable
11 = Invalid test, LinkMD
failed
If P2VCT [14:13] =11, this indicates an invalid test, and occurs when the KSZ8862M is unable to shut down the link
partner. In this instance, the test is not run, as it is not possible for the KSZ8862M to determine if the detected signal is a
reflection of the signal generated or a signal from another source.
Cable distance can be approximated by the following formula:
P2VCT [8:0] X 0.4m for port 2 cable distance
This constant may be calibrated for different cabling conditions, including cables with a velocity of propagation that varies
significantly from the norm.
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