003_6.htm

来自「通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）」· HTM 代码 · 共 272 行

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<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="003_6.files/right.jpg" width=563 
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<DIV class=im3><IMG height=168 src="003_6.files/003_6_4.jpg" width=330 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN class=ft0>3) 
<SPAN class=em2>填充信令单元（<SPAN class=em0>Fill-In Signaling Unit</SPAN>，<SPAN 
class=em0>FISU</SPAN>），由</SPAN>MTP2<SPAN 
class=em2>在没有其他信令信息可发时连</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>续发出。</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN class=ft2>图<SPAN 
class=em1>3-3 &nbsp;&nbsp;SS7</SPAN>协议栈</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft1>正常情况下，在链路空闲时<SPAN 
class=em0>HDLC</SPAN>链路发送标志符，而在没有信令时使用<SPAN 
class=em0>FISU</SPAN>与此不同。</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft0>FISU<SPAN class=em2>是要立即检测出退化链路，因为真实的消息使用一个</SPAN>FCS<SPAN 
class=em2>序列进行错误控制，而信令节</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps5><NOBR><SPAN 
class=ft1>点需要提前得到额外误码率的指示。<SPAN class=em0>MSU</SPAN>、<SPAN 
class=em0>LSSU</SPAN>和<SPAN class=em0>FISU</SPAN>分别如图<SPAN 
class=em0>3-4</SPAN>到图<SPAN class=em0>3-6</SPAN>所示。</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft2>图<SPAN class=em1>3-4 &nbsp;&nbsp;</SPAN>基本<SPAN 
class=em1>SS7</SPAN>消息信令单元</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft2>图<SPAN class=em1>3-5 &nbsp;&nbsp;SS7</SPAN>链路状态信号单元（<SPAN 
class=em1>LSSU</SPAN>）</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft3>第<SPAN class=em3>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft4>105</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft5>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft6>呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft6>信令连接控制部分</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>MTP3-SS7<SPAN class=em4>网络层</SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR>MTP2-SS7<SPAN class=em4>链路层</SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR>MTP1-SS7<SPAN class=em4>物理层</SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>AIN API<SPAN class=em4>和应</SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR><SPAN class=ft6>用服务元件</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR>OMAP:<SPAN class=em4>操作、维护</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft6>和管理部分</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR>ISDN<SPAN class=em4>用户部分</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR>(ISUP)</NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft6>路由标记＋用户消息</SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft6>由协议使用<SPAN class=em5>MTP 3</SPAN>生成</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>由<SPAN class=em5>MTP 
2</SPAN>链路管理产生</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft6>链路状态信令单元<SPAN class=em5>(LSSU)</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR><SPAN class=ft6>服务信息域<SPAN 
class=em5>SIF</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR>8<SPAN 
class=em4>比特</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR>6 LSB</NOBR></SPAN> 
<SPAN class=ps29><NOBR>7 <SPAN class=em4>比特</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR>7 <SPAN class=em4>比特</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR>7 <SPAN class=em4>比特</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR>7 <SPAN class=em4>比特</SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR>2<SPAN class=em4>个字节</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR>6<SPAN class=em4>个８位位组</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR>6 LSB</NOBR></SPAN> <SPAN class=ps36><NOBR>4 LSB</NOBR></SPAN> 
<SPAN class=ps37><NOBR>3<SPAN class=em4>个字节</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft6>预留<SPAN 
class=em5>MTP2</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft6>最多<SPAN class=em5>272</SPAN>个字节</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN class=ft6>链路状态域</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR>MTP2</NOBR></SPAN> <SPAN class=ps42><NOBR>2<SPAN 
class=em4>个字节</SPAN></NOBR></SPAN> <SPAN class=ps43><NOBR><SPAN 
class=ft6>添加</SPAN></NOBR></SPAN> <SPAN class=ps44><NOBR>2<SPAN 
class=em4>个字节</SPAN></NOBR></SPAN> <SPAN class=ps45><NOBR><SPAN 
class=ft6>消息信令单元<SPAN class=em5>(MSU)</SPAN></SPAN></NOBR></SPAN> </BODY></HTML>

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