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<TD borderColor=#6699ff><FONT
size=2>您的位置：技術園地>技術講座-GSM蜂窩移動通信系統 </FONT></TD></TR>
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<DIV align=center><FONT size=4><B><SPAN
style="FONT-SIZE: 15pt; COLOR: navy; FONT-FAMILY: 宋體; mso-bidi-font-size: 10.0pt"><SPAN
lang=EN-US>第六講 GSM網絡支持的業(yè)務(2)</SPAN></SPAN></B></FONT></DIV></TD></TR>
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style="TEXT-JUSTIFY: inter-ideograph; TEXT-INDENT: 21.15pt; TEXT-ALIGN: justify; mso-char-indent-count: 2.0; mso-char-indent-size: 10.55pt"><B><SPAN
lang=EN-US style="FONT-FAMILY: 宋體">6.2<SPAN
style="mso-spacerun: yes"> </SPAN>承載業(yè)務<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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color=#000066
size=3>GSM系統一開始就考慮兼容多種在ISDN中定義的承載業(yè)務，滿足GSM移動客戶<BR>對數據通信服務的需要。GSM系統設計的承載業(yè)務不僅使移動客戶之間能完成<BR>數據通信，更重要的是能為移動客戶與PSTN或ISDN客戶之間提供數據通信服務，還能使GSM移動通信網與其它公用數據網互通，例如公用分組數據網和公用電路數據網。
</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: 宋體"><FONT face=楷體_GB2312
color=#000066
size=3>GSM系統各種承載業(yè)務的定義都可歸結為在R／S參考點(參見圖6-1)之間提供信息傳送，用來支持多客戶應用。<O:P>
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<IMG height=178 src="g6-2.files/g6-238.gif" width=275
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color=#000066 size=3>圖<SPAN lang=EN-US>6-1<SPAN
style="mso-spacerun: yes"> </SPAN>GSM支持的業(yè)務接入點<O:P>
</O:P></SPAN></FONT><FONT face=楷體_GB2312 size=3><SPAN
lang=EN-US><O:P></O:P></SPAN></FONT><FONT face=楷體_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: 宋體"><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-ALIGN: justify"><SPAN
lang=EN-US style="FONT-FAMILY: 宋體"><FONT size=3><SPAN
style="mso-spacerun: yes"> </SPAN><FONT
face=楷體_GB2312
color=#000066>GSM系統第一階段提供的承載業(yè)務，其業(yè)務編號、名稱、終端網路和在MS的接入口等見表6-2所示，需要說明的是，在表中“MS(或IWF互通功能)的接入接口”括號內的數字表示終端網路的代號，不加括號的數字表示在MS或互通功能(1WF)所需的接入接口特征編號，分別與不同的終端網路相對應，也就是說對于不同的終端網路可采用不同的或系統的接入接口。表6-3表示了接入接口的編號。</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第一階段提供的承載業(yè)務<O:P>
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