Multiplexer User's Guide
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Mux_guide_v06 Page 4 of 36 30.06.2004
5 Multiplexer protocol version control.........................................................................33
5.1 Introduction..........................................................................................................33
5.2 Multiplexer protocol versions............................................................................... 34
5.3 Implementing version control...............................................................................35
5.3.1 Troubleshooting..................................................................................... 35
5.3.2 Coding of “TestCommand” message.....................................................36
5.3.3 Example of “TestCommand” message ..................................................36
Figure 1: Multiplexer architecture.............................................................................................9
Figure 2: Logical flow control and RTS/CTS signaling behind the decoder........................... 15
Figure 3: Data link layer .........................................................................................................17
Figure 4: Relationship between the customer µC and the GSM engine µC...........................22
Figure 5: MPI – Startup, DLC establishment and information transfer...................................23
Figure 6: MP - DLC release and close down..........................................................................24
Figure 7: DLC establishment..................................................................................................25
Figure 8: Information transfer.................................................................................................25
Figure 9: DLC release............................................................................................................ 26
Figure 10: Multiplexer control channel ...................................................................................26
Figure 11: Modem status command (MSC) ...........................................................................28
Figure 12: Power Saving Control (PSC).................................................................................30
Figure 13: Establishing the multiplexer control channel and the logical channel................... 32
Figure 14: MSC as used in version 3..................................................................................... 34
Table 1: Comparison of multiplexer channels........................................................................ 10
Table 2: Address field.............................................................................................................18
Table 3: Assignment of the DLCI ...........................................................................................18
Table 4: Use of the command/response bit............................................................................18
Table 5: Coding of the control field.........................................................................................19
Table 6: Version differences for MSC ....................................................................................34
Table 7: IEI coding .................................................................................................................36
Table 8: Coding of “TestCommand” (Example)......................................................................36