Siemens Multiplexer Mux_guide_v06 Uživatelský manuál Strana 32

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Multiplexer User's Guide
Confidential / Released
s
mo b i l e
Mux_guide_v06 Page 32 of 36 30.06.2004
4.4 Example: Establishing logical channels without parameter
negotiation
Send AT+CMUX=0; wait for the response
Send Request SABM for DLCI = 0; wait for the response
Send Request SABM for all requested DLCIs; wait for the response
As a result the multiplexer is established and information / data can be transmitted
( ready for Information Transfer).
Customer
µC
Closed Down Closed Down
RequestStartUp
ResponseStartUp
ConfirmStartUp
IndicationStartUp
DisconnectedDisconnected
Serial
interface
Start Up
"AT+CMUX"
Connected
DLCI = 0
DLC Establishment,
Create DLCI = 0
Disconnected
DLCI = 0
Disconnected
DLCI = 0
RequestSABM
DLCI = 0
IndicationSABM
DLCI = 0
ResponseUA
DLCI = 0
ConfirmUA
DLCI = 0
Connected
DLCI = 0
Connected
DLCI = 1
DLC Establishment,
Create DLCI = 1
Disconnected
DLCI = 1
Disconnected
DLCI = 1
RequestSABM
DLCI = 1
IndicationSABM
DLCI = 1
ResponseUA
DLCI = 1
ConfirmUA
DLCI = 1
Connected
DLCI = 1
GSM engine µC
Figure 13: Establishing the multiplexer control channel and the logical channel
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