Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3507
Título: On the adaptation of broadcast transactions in token-passing fieldbus networks with heterogeneous transmission media
Autor: Alves, Mário
Tovar, Eduardo
Vasques, Francisco
Data: 2001
Editora: Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto. Universidade do Porto.
Resumo: Broadcast networks that are characterised by having different physical layers (PhL) demand some kind of traffic adaptation between segments, in order to avoid traffic congestion in linking devices. In many LANs, this problem is solved by the actual linking devices, which use some kind of flow control mechanism that either tell transmitting stations to pause (the transmission) or just discard frames. In this paper, we address the case of token-passing fieldbus networks operating in a broadcast fashion and involving message transactions over heterogeneous (wired or wireless) physical layers. For the addressed case, real-time and reliability requirements demand a different solution to the traffic adaptation problem. Our approach relies on the insertion of an appropriate idle time before a station issuing a request frame. In this way, we guarantee that the linking devices’ queues do not increase in a way that the timeliness properties of the overall system turn out to be unsuitable for the targeted applications.
Peer review: no
URI: http://hdl.handle.net/10400.22/3507
Aparece nas colecções:ISEP – CISTER – Comunicações em eventos científicos

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