Sierra Wireless DART 200 CDPD Modem Especificaciones descargar pdf (Pagina 6)

Sierra Wireless, Inc. CDPD Primer

2130006 Rev 1.0 Page vi

List of Figures

Figure 2-1: Forward and reverse channels ........................................................................................3

Figure 2-2: A cellular telephone system............................................................................................4

Figure 2-3: Cellular channel reuse using three sectors per cell .........................................................5

Figure 2-4: Cell handoff in three-sector cells....................................................................................6

Figure 3-1: Cellular radio channel usage within a single cell sector .................................................9

Figure 3-2: CDPD channel hopping..................................................................................................9

Figure 3-3: How cellular voice and CDPD coexist in a three-channel sector .................................10

Figure 4-1: ISO layered communications architecture....................................................................20

Figure 4-2: Example of a CDPD virtual terminal subprofile ..........................................................22

Figure 5-1: CDPD mobility management scenario 1 ......................................................................26

Figure 5-2: CDPD mobility management scenario 2 ......................................................................27

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Sierra Wireless DART 200 CDPD Modem Especificaciones Pagina 6