| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程研究所 === 84 === The growth of user devices attached to public networks and the
development of new applications increase the data traffic and
the stringent delay performance requirement. One way to meet
the above requirements is to interconnect existing networks
with a high speed network as a backbone. Since FR has been
widely used in public data networks to interconnect LANs, ATM
is a high speed network technology aimed to support any kind of
services. To interconnect FR and ATM is thus an important
issue. In order to interconnect two heterogeneous networks, an
element called interworking unit is required to perform
interworking functions to map protocols between FR and ATM.
Because frames are variable length in FR and ATM cells are with
fixed length of ser data, in IWU, there are two modes of
operation: message mode and streaming mode. In message mode,
before any protocol processing, all cells of the same frame
have to be received. In streaming mode, the protocol
processing begins without waiting all cells of the same frame
are received. In this paper, we perform a simulation experiment
to evaluate performances of the FR/ATM interworking unit on the
direction from ATM to FR with message mode and streaming mode.
The performances we focus on are the reassembly buffer size,
the FR transmission buffer size, the average delay time of a
frame experienced in IWU and the loss ratio. According to the
ATM and FR protocols, traffic control is an optional function
to the end systems. Therefore, we also compared the
performances with different traffic algorithms in IWU.
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