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...roaches and techniques have been used to make Ethernet deterministic in order to take advantage of its low cost and higher speeds than those of real-time field buses available today (like the CAN bus =-=[9]-=-, for example). Some of these approaches are the modification of the Medium Access Control [7], the addition of transmission control [2], a protocol using time-triggered traffic [14], or the usage of ...

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...ried inside the Data field of the lower-layer protocol. We are currently using Ethernet for the lower layer, but it can be easily replaced by another protocol. Ethernet II has the following structure =-=[5]-=-: 8 bytes 6 bytes 6 bytes 2 bytes 46-1500 bytes 4 bytes Preamble Destination Address Source Address Type Data The Type field identifies what type of high-level network protocol is being carried in the...

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... can also take advantage of the reliability and robustness that the Ada language provides, and we open the door to a possible future extension to support realtime distribution in the Ravescar profile =-=[1]-=-. We also have done a clean-up of the protocol, we have generalized the architecture to make it independent of the underlying communications network, and we have developed a more precise real-time mod...

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... (like the CAN bus [9], for example). Some of these approaches are the modification of the Medium Access Control [7], the addition of transmission control [2], a protocol using time-triggered traffic =-=[14]-=-, or the usage of a switched Ethernet [3]. The objective of this work is to achieve a relatively high speed mechanism for realtime communications at a low cost, while keeping the predictable timing be...

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...een obtained. Furthermore, this protocol provides the ability of recovering from some fault conditions. It has been ported to an implementation of the Minimal Real-Time POSIX standard called MaRTE OS =-=[10]-=-, and is being used to support real-time communications in an implementation of Ada’s Distributed Systems Annex (RT-GLADE). It has been successfully used to implement a distributed controlled for an i...

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...Ethernet media. In a previous work we presented a preliminary version of RT-EP [11] in which we discussed the fault-recovery mechanism and the way in which the protocol can be modelled using the MAST =-=[12]-=- Real-time Modelling and Analysis Suite. We also discussed the implementation, in C language, of RT-EP in MaRTE OS [10] and we also measured the overheads it introduces. In this paper we present a com...

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...introduces. In this paper we present a complete description of the protocol and we propose the Ada language for its implementation, to ensure a smooth integration with DSA middleware such as RT-GLADE =-=[8]-=-, or Polyorb [15] in the future. By porting the protocol to Ada we can also take advantage of the reliability and robustness that the Ada language provides, and we open the door to a possible future e...

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... of these approaches are the modification of the Medium Access Control [7], the addition of transmission control [2], a protocol using time-triggered traffic [14], or the usage of a switched Ethernet =-=[3]-=-. The objective of this work is to achieve a relatively high speed mechanism for realtime communications at a low cost, while keeping the predictable timing behaviour required in distributed hard real...

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...his paper we present a complete description of the protocol and we propose the Ada language for its implementation, to ensure a smooth integration with DSA middleware such as RT-GLADE [8], or Polyorb =-=[15]-=- in the future. By porting the protocol to Ada we can also take advantage of the reliability and robustness that the Ada language provides, and we open the door to a possible future extension to suppo...

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...a Real-Time Ethernet communication without modifying the existing hardware, and has been designed to avoid collisions in Ethernet media. In a previous work we presented a preliminary version of RT-EP =-=[11]-=- in which we discussed the fault-recovery mechanism and the way in which the protocol can be modelled using the MAST [12] Real-time Modelling and Analysis Suite. We also discussed the implementation, ...

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...hose of real-time field buses available today (like the CAN bus [9], for example). Some of these approaches are the modification of the Medium Access Control [7], the addition of transmission control =-=[2]-=-, a protocol using time-triggered traffic [14], or the usage of a switched Ethernet [3]. The objective of this work is to achieve a relatively high speed mechanism for realtime communications at a low...

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...e of its low cost and higher speeds than those of real-time field buses available today (like the CAN bus [9], for example). Some of these approaches are the modification of the Medium Access Control =-=[7]-=-, the addition of transmission control [2], a protocol using time-triggered traffic [14], or the usage of a switched Ethernet [3]. The objective of this work is to achieve a relatively high speed mech...

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...rstand its functionality and to identify operations involved in the timing model. Fig. 2 shows the states and the transitions among them using UML notation [13], which is based on Harel’s statecharts =-=[4]-=-. The description of the different states is as follows: • Offline. It is the initial state reached during configuration time. Each station reads the configuration describing the logical ring and gets...