📄 003_10.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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<DIV class=im2><IMG height=392 src="003_10.files/003_10_3.jpg" width=279 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>速率。当发送者收到<SPAN 
class=em1>BUSY</SPAN>信号以后，未经确认的<SPAN class=em1>MSU<SPAN 
class=em0>，</SPAN></SPAN>以及队列中即将在同一条链路中发</NOBR></SPAN> <SPAN 
class=ps1><NOBR>出的所有<SPAN class=em1>MTP3</SPAN>消息，都被暂停并保持。<SPAN 
class=em1>BUSY</SPAN>信号周期性地每隔<SPAN 
class=em1>100~120ms</SPAN>重发一次。当消</NOBR></SPAN> <SPAN 
class=ps2><NOBR>息处理恢复正常后，拥塞的<SPAN 
class=em1>MTP2</SPAN>子层发送一个确认信号，确认已正确接收并处理的最后一个</NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft1>MSU<SPAN class=em0>。这样便通知了远程</SPAN>MTP2<SPAN 
class=em0>子层：一切恢复正常，可以继续发送</SPAN>MSU<SPAN 
class=em0>了。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR>经常有潜在的严重问题造成拥塞或别的故障，导致链路上出现永久或半永久<SPAN 
class=em1>BUSY</SPAN>状态。</NOBR></SPAN> <SPAN class=ps5><NOBR>如果<SPAN 
class=em1>BUSY</SPAN>状态保持超过几秒（<SPAN class=em1>5 ~ 
6</SPAN>秒），远端将认为链路失效，转而寻找其他路由来完成信</NOBR></SPAN> <SPAN 
class=ps6><NOBR>令。在信令点之间选择路由的过程牵涉到负载平衡的考虑。但是，一旦通往一个<SPAN 
class=em1>SSP</SPAN>的路由已</NOBR></SPAN> <SPAN class=ps7><NOBR>被选定，就将一直有效，除非<SPAN 
class=em1>MTP3</SPAN>要求重新路由。在流之中不改变路径的原因在于要避免无</NOBR></SPAN> <SPAN 
class=ps8><NOBR>序消息到达目的地。一旦一条链路因为不稳定、不可靠或拥塞而被认为失效，则将选择备份</NOBR></SPAN> <SPAN 
class=ps9><NOBR>路由，并一直使用，直到原先失效链路的状态恢复正常为止。选择路由的一个快速方法是通</NOBR></SPAN> <SPAN 
class=ps10><NOBR>过<SPAN class=em1>MSU</SPAN>的路由标记中的信令链路选择子域。</NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft1>STP<SPAN 
class=em0>根据信令链路选择符的设置来决定选择哪条链路。它可以用在信令网络拓扑中进行链</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps12><NOBR>路的流量控制和负载平衡。这样，不稳定链路上传输的信令可以被临时映射到别的链路上，</NOBR></SPAN> 
<SPAN class=ps13><NOBR>直到错误恢复。</NOBR></SPAN> <SPAN 
class=ps14><NOBR>错误控制与恢复的实现有两种方法。基本方法是接受方检测丢失或错误的<SPAN class=em1>MSU<SPAN 
class=em0>（</SPAN></SPAN>错误的校</NOBR></SPAN> <SPAN 
class=ps15><NOBR>验比特域），并要求重传。预防循环重传（<SPAN class=em1>Preventive Cyclic 
Retransmission</SPAN>，<SPAN class=em1>PCR</SPAN>）方法用于</NOBR></SPAN> <SPAN 
class=ps16><NOBR>有很大端到端之间延迟的链路。<SPAN class=em1>PCR</SPAN>方法就是当发送端没有别的<SPAN 
class=em1>MSU</SPAN>要传时，重传所有未经确</NOBR></SPAN> <SPAN class=ps17><NOBR>认的<SPAN 
class=em1>MSU<SPAN 
class=em0>，</SPAN></SPAN>而不管其有没有正确接收（发送端无须等待）。后面还将进一步讨论这种方法。</NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft2>第<SPAN 
class=em2>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft3>109</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft4>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft5>图<SPAN class=em3>3-10 
&nbsp;&nbsp;</SPAN>远端接收到的错误的<SPAN class=em3>MSU</SPAN>及恢复</SPAN></NOBR></SPAN> 
<SPAN class=ps22><NOBR><SPAN class=ft5>图<SPAN class=em3>3-9 
&nbsp;&nbsp;STP</SPAN>间无错<SPAN class=em3>MSU</SPAN>交换</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft6>错误的或丢失的<SPAN 
class=em4>MSU</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft6>上一个正确接收的</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft7>MSU<SPAN class=em5>是</SPAN>103</SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR><SPAN class=ft6>发送者重传错误的</SPAN></NOBR></SPAN> <SPAN 
class=ps27><NOBR><SPAN class=ft7>MSU<SPAN 
class=em5>之后的所有</SPAN>MSU</SPAN></NOBR></SPAN> </BODY></HTML>
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