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📁 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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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="003_8.files/right.jpg" width=563 
border=0></DIV>
<DIV class=im1><IMG height=3 src="003_8.files/003_8_2.jpg" width=558 
border=0></DIV>
<DIV class=im2><IMG height=2 src="003_8.files/003_8_3.jpg" width=558 
border=0></DIV>
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<DIV class=im4><IMG height=223 src="003_8.files/003_8_5.jpg" width=315 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em3>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft1>107</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft2>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft3>息被每个中间的交换机识别，然后继续朝目的地传播。<SPAN 
class=em0>PAM</SPAN>消息没有相关的<SPAN class=em0>ISUP</SPAN>参数。</SPAN></NOBR></SPAN> 
<SPAN class=ps4><NOBR><SPAN class=ft4>图<SPAN class=em4>3-8 
&nbsp;&nbsp;ISUP</SPAN>信令：端对端<SPAN class=em4>SCCP</SPAN>方法</SPAN></NOBR></SPAN> 
<SPAN class=ps5><NOBR><SPAN class=ft3>反过来，当<SPAN class=em0>ISUP</SPAN>使用<SPAN 
class=em0>SCCP</SPAN>服务时，如图<SPAN 
class=em0>3-8</SPAN>所示，初始交换机需要知道终端交换机的点</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft3>码，这样才能正确地对信令消息进行路由。在这种信令中不再需要使用电路标识码（&nbsp;<SPAN 
class=em0>Circuit</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft5>Identification Code<SPAN class=em1>，</SPAN>CIC<SPAN 
class=em1>），</SPAN><SPAN class=em1>因为消息传输路径与正在进行中的呼叫无关。正是由于</SPAN>ISUP<SPAN 
class=em1>信令</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft3>使用了<SPAN class=em0>SCCP<SPAN class=em1>，</SPAN></SPAN>所以<SPAN 
class=em0>ISUP</SPAN>在<SPAN class=em0>SS7</SPAN>协议栈中有一部分处在<SPAN 
class=em0>SCCP</SPAN>之上。</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft5>2. MTP<SPAN class=em5>信令单元描述</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft3>如图<SPAN class=em0>3-6</SPAN>所示，<SPAN 
class=em0>FISU</SPAN>相当简明易懂，它基本上就是在信令链路空闲时所发的填充符。包中</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft3>的长度指示为<SPAN class=em0>LI=1</SPAN>。<SPAN 
class=em0>LI</SPAN>占用了第三字节（从左边<SPAN class=em0>BSN</SPAN>字节算起）的<SPAN 
class=em0>6</SPAN>个最低有效位。<SPAN class=em0>BSN</SPAN>、</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft5>FSN<SPAN 
class=em1>分别表示反向和前向序列号，对于确保接收方不会误接收序列外的信令消息有重要意义。</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps13><NOBR><SPAN class=ft5>FISU<SPAN 
class=em1>可以用来提供消息确认。序列号表示</SPAN>MSU<SPAN class=em1>的最后有效序列号，而且</SPAN>FISU<SPAN 
class=em1>没有分配自己的</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft3>序列号。</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft3>如图<SPAN class=em0>3-5</SPAN>所示，<SPAN 
class=em0>LSSU</SPAN>只有局部的作用，它包含信令链路的状态信息，参见表<SPAN class=em0>3-1</SPAN>。<SPAN 
class=em0>LI</SPAN>设为<SPAN class=em0>1</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft3>还是<SPAN class=em0>2</SPAN>取决于消息中有<SPAN 
class=em0>1</SPAN>个还是<SPAN class=em0>2</SPAN>个状态字节。状态码在<SPAN 
class=em0>LSI</SPAN>字节的<SPAN class=em0>4</SPAN>个最低有效位中右对齐，其</SPAN></NOBR></SPAN> 
<SPAN class=ps17><NOBR><SPAN class=ft3>中只有<SPAN class=em0>3</SPAN>位已经使用。<SPAN 
class=em0>LSSU</SPAN>也能通过<SPAN class=em0>FSN</SPAN>、<SPAN 
class=em0>BSN</SPAN>域给<SPAN class=em0>MSU</SPAN>提供正的或负的确认。<SPAN 
class=em0>LSSU</SPAN>没有分</SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft3>配自己的序列号。错误接收的<SPAN class=em0>LSSU</SPAN>和<SPAN 
class=em0>FISU</SPAN>不再重传。</SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft6>表<SPAN class=em6>3-1 &nbsp;&nbsp;LSSU</SPAN>信令单元的<SPAN 
class=em6>LSI</SPAN>编码</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN 
class=ft7>LSI<SPAN class=em7>编码</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR>意</NOBR></SPAN> <SPAN class=ps22><NOBR>义</NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft7>000-SIO</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR>没有对齐。在第一次校准链路，而且没有检测到进入标志时，<SPAN class=em2>STP</SPAN>会发送<SPAN 
class=em2>SIO</SPAN>。发送<SPAN class=em2>SIO</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR>的其他情况包括<SPAN class=em2>MSU</SPAN>消息长度和位填充之间的冲突</NOBR></SPAN> 
<SPAN class=ps26><NOBR><SPAN class=ft7>001-SIN</SPAN></NOBR></SPAN> <SPAN 
class=ps27><NOBR>正常对齐。一旦收到并识别出标志，<SPAN class=em2>STP</SPAN>就会发送<SPAN 
class=em2>SIN</SPAN>。当两个<SPAN class=em2>STP</SPAN>都识别正常对齐时，</NOBR></SPAN> <SPAN 
class=ps28><NOBR>它们恢复发送<SPAN class=em2>FISU</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft7>010-SIE</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR>紧急对齐。在<SPAN class=em2>SIE</SPAN>和<SPAN 
class=em2>SIN</SPAN>期间，<SPAN class=em2>STP</SPAN>不会发送<SPAN 
class=em2>MSU</SPAN>。当再次检测到正常对齐时，<SPAN class=em2>STP</SPAN>第<SPAN 
class=em2>2</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR>层调用紧急对齐过程并退出</NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft7>011-SIOS</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR>不可用</NOBR></SPAN> 
<SPAN class=ps34><NOBR><SPAN class=ft7>100-SIPO</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR>处理器故障。在问题解决之前，这个动作还会挂起链路以备将来之用</NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft7>101-SIB</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR>忙。当接收到这个编码时，<SPAN class=em2>MTP3</SPAN>被请求停止发送<SPAN 
class=em2>MSU</SPAN>。<SPAN class=em2>MTP2</SPAN>用它来进行流控制</NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft5>LSSU<SPAN class=em1>消息的上下文属于</SPAN>MTP2<SPAN 
class=em1>局部，除非在状态正忙或远端处理器故障情况下为</SPAN>MTP3<SPAN 
class=em1>传</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR>电路<SPAN 
class=em2>IDA</SPAN>上建立</NOBR></SPAN> <SPAN class=ps40><NOBR>的呼叫</NOBR></SPAN> 
<SPAN class=ps41><NOBR>电路<SPAN class=em2>IDB</SPAN>上建立</NOBR></SPAN> <SPAN 
class=ps42><NOBR>的呼叫</NOBR></SPAN> <SPAN class=ps43><NOBR><SPAN class=ft7>SS7 
<SPAN class=em7>信令</SPAN>PC=3</SPAN></NOBR></SPAN> </BODY></HTML>

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