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Remote Procedure Call
Mechanisms
• Client process calls the client
stub
• Marshalling-packing the
parameters
• Kernel receives from client
stub and sends to server machine
• Kernel on server OS passes the
message to server stub
• The server stub processes it
and the reply follows the same path in the other
direction
Problems may occur in RPC
• Passing pointer parameters from
client place to server space
• weakly typed language- C may
not be suitable
• Type conversion
• Use of global variables –since
two different space involved
Still UDP is commonly used in RPC
Another application of UDP a protocol
uses UDP
(a) The position
of RTP in the protocol stack.
(b) Packet
nesting.
RTP Real time
transport protocol
• UDP is used with real time
multimedia applications
• the applications are: internet
radio, internet telephony, music on demand, video
on demand, video conferencing
• RTP is used for different
formats like GSM, MP3 for sound and MPEG and
H.263 for video
• The basic function of RTP is to
multiplex several real time data stream onto
single stream of UDP packets. The
UDP stream can be sent to single destination
(unicast) and multiple
destination (multicast)
RTP Header
details
• P padded bit
• X extension header present or
not
• CC contributing sources
• M marker bit
• Version field
• Payload type
• Seq no
• Time stamp
• Synchronization and
contributing source identifier
RTP Header
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