Availability - Multiple Point - End to End - 平均變化量
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定義或公式：
平均變化量(%) = (本月(周)平均值-上月(周)平均值)/上月(周)平均值 *100

*註
1. Availability(%) = (1 - PackLossRate)*100
2. PackLossRate(%) = ((errors/(errors+numcomplete))*100 ；where errors = numdisconn + numtimeout + numbusy + numnoconn + numdrop + numseqerr + numverifyerr
*numdisconn : Number of Disconnects
*numtimeout : Number of Timeouts
*numbusy : Number of Busies
*numnoconn : Number of No Connections
*numdrop : Number of RTT Dropped
*numseqerr : Number of Sequence Errors
*numverifyerr : Number of Verify Errors
*numcomplete : Number of RTTs completed
3. Sample Interval:每10秒送出1個packets(64byte/packet)，用ping得出結果。