📄 002_6.htm

📁 通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）
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<HTML><HEAD><TITLE>002_6</TITLE>
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<DIV class=im0><IMG height=64 src="002_6.files/left.jpg" width=564 
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<DIV class=im2><IMG height=302 src="002_6.files/002_6_3.jpg" width=545 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>时间戳（<SPAN 
class=em0>Timestamp</SPAN>，<SPAN class=em0>32</SPAN>比特）：时间戳是在<SPAN 
class=em0>RTP</SPAN>数据包的第一个字节采样时刻设置的。</NOBR></SPAN> <SPAN 
class=ps1><NOBR>采样时刻必须从时钟获得，时钟必须随时间单调线性增加，以允许同步和抖动计算。时钟分</NOBR></SPAN> <SPAN 
class=ps2><NOBR>辨率必须满足要求的同步精确度，以及对包到达抖动的测量，并且可以分接成端到端延迟的</NOBR></SPAN> <SPAN 
class=ps3><NOBR>分辨率。时钟的分辨率越高，网络性能参数的观察结果就越精确。时钟频率与作为载荷携带</NOBR></SPAN> <SPAN 
class=ps4><NOBR>的数据格式无关，它可以在配置或者定义载荷格式的规范中静态规定，也可以由非</NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>RTP<SPAN 
class=em2>方法</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR>定义的有效载荷格式动态规定。对于周期性发送<SPAN 
class=em0>RTP</SPAN>包而言，采样时刻是由采样时钟而不是</NOBR></SPAN> <SPAN 
class=ps7><NOBR>系统时钟确定的。对于语音电话，时间戳时钟可能在每个采样周期增加<SPAN 
class=em0>1</SPAN>。如果一个应用读入</NOBR></SPAN> <SPAN class=ps8><NOBR>的数据块占据<SPAN 
class=em0>N</SPAN>个采样周期，时间戳对于这样的数据块会增加<SPAN class=em0>N</SPAN>。</NOBR></SPAN> 
<SPAN class=ps9><NOBR><SPAN class=ft2>a) &nbsp;&nbsp;PCM<SPAN 
class=em3>语音的</SPAN>VoIP RTP<SPAN class=em3>包（得到</SPAN>HP-IA<SPAN 
class=em3>的许可）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft2>b) &nbsp;&nbsp;H.261 RTP<SPAN class=em3>包（得到</SPAN>HP-IA<SPAN 
class=em3>的许可）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft3>图<SPAN class=em4>2-3 &nbsp;&nbsp;RTP</SPAN>包</SPAN></NOBR></SPAN> 
<SPAN class=ps12><NOBR><SPAN class=ft4>62&nbsp;&nbsp;<SPAN class=em1>IP 
</SPAN><SPAN class=em5>电话技术：稳定的</SPAN><SPAN class=em1>VoIP</SPAN><SPAN 
class=em5>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft5>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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