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<TD borderColor=#6699ff><FONT
size=2>您的位置：技术园地>技术讲座-GSM蜂窝移动通信系统 </FONT></TD></TR>
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<DIV align=center><FONT size=4><B><SPAN
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lang=EN-US>第六讲 GSM网络支持的业务(2)</SPAN></SPAN></B></FONT></DIV></TD></TR>
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lang=EN-US style="FONT-FAMILY: 宋体">6.2<SPAN
style="mso-spacerun: yes"> </SPAN>承载业务<O:P>
</O:P></SPAN></B></P>
<P class=MsoNormal
style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify"><SPAN
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size=3>GSM系统一开始就考虑兼容多种在ISDN中定义的承载业务，满足GSM移动客户<BR>对数据通信服务的需要。GSM系统设计的承载业务不仅使移动客户之间能完成<BR>数据通信，更重要的是能为移动客户与PSTN或ISDN客户之间提供数据通信服务，还能使GSM移动通信网与其它公用数据网互通，例如公用分组数据网和公用电路数据网。
</FONT><FONT size=3><O:P></O:P></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN-TOP: 0px; TEXT-JUSTIFY: inter-ideograph; MARGIN-BOTTOM: 0px; TEXT-INDENT: 21pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体"><FONT face=楷体_GB2312
color=#000066
size=3>GSM系统各种承载业务的定义都可归结为在R／S参考点(参见图6-1)之间提供信息传送，用来支持多客户应用。<O:P>
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<IMG height=178 src="g6-2.files/g6-238.gif" width=275
v:shapes="_x0000_i1025"><O:P> </O:P></FONT></SPAN></P>
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color=#000066 size=3>图<SPAN lang=EN-US>6-1<SPAN
style="mso-spacerun: yes"> </SPAN>GSM支持的业务接入点<O:P>
</O:P></SPAN></FONT><FONT face=楷体_GB2312 size=3><SPAN
lang=EN-US><O:P></O:P></SPAN></FONT><FONT face=楷体_GB2312
size=3><SPAN lang=EN-US><O:P></O:P></SPAN></FONT><FONT size=3><SPAN
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lang=EN-US style="FONT-FAMILY: 宋体"><FONT size=3> <O:P>
</O:P></FONT></SPAN></P>
<P class=MsoNormal
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lang=EN-US style="FONT-FAMILY: 宋体"><FONT size=3><SPAN
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face=楷体_GB2312
color=#000066>GSM系统第一阶段提供的承载业务，其业务编号、名称、终端网路和在MS的接入口等见表6-2所示，需要说明的是，在表中“MS(或IWF互通功能)的接入接口”括号内的数字表示终端网路的代号，不加括号的数字表示在MS或互通功能(1WF)所需的接入接口特征编号，分别与不同的终端网路相对应，也就是说对于不同的终端网路可采用不同的或系统的接入接口。表6-3表示了接入接口的编号。</FONT><O:P>
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color=#000066 size=3>表<SPAN lang=EN-US>6－2<SPAN
style="mso-spacerun: yes"> </SPAN>GSM第一阶段提供的承载业务<O:P>
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