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GSM0128IG001
52
Revision Draft – 9/22/08
9.5.1
Using Port Library
Figure 20 provides the architecture for Port Library access.
UART Driver
Port Library
Host Control Interface
Host Application
Host
Modem
Figure 20 - Using Port Library
Port Libraries provide the most basic modem access services. It converts modem control
messages to either UDP SLIP or UDP PPP, and vice versa.
SLIP access is not currently
available.
Modem Control Message
SLIP Header
IP Header
UDP Header
Modem Control Message
SLIP End
Or
PPP Header
IP Header
UDP Header
Modem Control Message
PPP End
9.5.2 Using
Messaging
Library
Figure 21 provides the architecture for Messaging Library access.
UART Driver
Port Library
Host Control Interface
Messaging Library
Host Application
Host
Modem
Figure 21 - Using Messaging Library
Messaging Library provides some important modem access services. It builds a modem control
message and converts the message to either UDP SLIP or UDP PPP before sending the data to
the modem. It also parses the modem control messages from the modem.
SLIP access is not
currently available.
Parameter, Data
SLIP Header
IP Header
UDP Header
Modem Control Message
SLIP End
Or
PPP Header
IP Header
UDP Header
Modem Control Message
PPP End