User's Manual

Boomer II User Manual & Integrator’s Guide ______________________________________________ SDK SCRAPI
BM210012WT27 133 Wavenet Technology
LAYER NAME CONTENT FUNCTION
to-Peer routing SDU formatting is contained in the
NCL interpreter.
2. DATA LINK LAYER
NCL Interpreter &
Extender port – Serial
Driver.
Application NCL API function requests are processed
via a FIFO queue. RPM responses or received data is
tagged and encoded for the router as required Also
the UART DLL that handles the extender port UART
to modem communications resides in the link layer
modules..
1. PHYSICAL / BIT TRANSFER
LAYER
Extender Port to RPM. 9600, 8, 1, N on serial port and a wakeup line.
Wavenet’s current NCL API protocol stack is implemented with the
hierarchical structure. All DLLs including MSMQ files are included in
the install cabinet files for the VDD.
Message Router
The PC or PPC loads MSMQ as a device driver. Applications using the
modem must open a session with VDD by calling ‘VDDOpen()’ which
will create a private Receive MSMQ queue for the instance of the
application (client). The name of this private queue will be sent to the
serial port server (VDD) along with an open session request. The port
server will in turn create a private MSMQ queue to receive data from
the client. All Modem Events and response messages to be
communicated between the VDD and the application will be via the
receive queues. Transmit function requests from the applications
(clients) are queued by the VDD and are processed as a FIFO buffer by
the NCL interpreter. On Wakeup the VDD will be activated, if any
applications receive queues are open the RX event will be posted to
those queues. If no receive queues are active, the VDD will buffer the
RX events and start up the registered on_wakeup applications. After
the applications have successfully opened a VDD session the VDD will
pass the RX events to those applications.
NCL Interpreter
The NCL Interpreter strips NCL API function calls from application
messages, queue the calls and execute the calls on a FIFO basis.
Received messages will be queued and matched against an appropriate
request (if not an event), and passed to the router with the
corresponding tags.
Link Layer
The RPM communicates with a PC via a standard communications port
and a user supplied RS232 to CMOS level device. For the Pocket PC
(PPC) the RPM communicates via the PPC extender port UART. The
PPC performs an auto detect and wakeup when an attached modem
receives some data and the PPC is in suspend mode.