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Download Data Networks with Satellites: Working Conference of the by E. V. Hoversten (auth.), Joachim Majus, Otto Spaniol (eds.) PDF

By E. V. Hoversten (auth.), Joachim Majus, Otto Spaniol (eds.)

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Read Online or Download Data Networks with Satellites: Working Conference of the Joint GI/NTG working group ”Computer Networks”, Cologne, September 20.–21., 1982 PDF

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Extra resources for Data Networks with Satellites: Working Conference of the Joint GI/NTG working group ”Computer Networks”, Cologne, September 20.–21., 1982

Example text

Stationary state probabilities =r) exist and are given by p and 'TTl = l-p. The blocking probability is given by the proportion of time the system spends in state O. Thus: Pr (A) = _ _ _ __ P p. REJ 1M +l-p 3) Subchannel Ca is interblocked by subchannel Cs (8 ;

The fastest way to recover from a frame error (which is usually detected by the correct reception of a subsequent frame) is a reject command (REJ) or a selective reject command (SREJ) which ask for retransmission of all frames beginning with the erroneous one (REJ) or of the erroneous frame only (SREJ). e. if in the SREJ case a new error is observed the receiver has to wait until the first one has been corrected before the second error can be indicated to the sender). - if for a rejected frame is still in error when retransmitted the receiver cannot ask another retransmission by a new REJ or SREJ command but a timeout recovery has to be carried out in that case.

1I l-'-. _. ~. -' 1 Ws·M). = ACK, REJ I I ~ ... ~. -t. _! - ___ J _ -J L ~· .... 1 I1 .. _. ' - - -.... 'W----J'~ :>. c s:: PoO Q)'M I-< 0 Q)'1j '1j 'M Q) ~ s:: 00 '-' .... 0 o U Q) I-< Q) e 42 In the following several subchannel concepts are described. 2. Static Virtual Subchannel Scheme (SVC Scheme) Channel subdivision: Time slots. This will be called a 'virtual' subchannel scheme since the total bandwidth is available for frame transmission. Frame acceptance: Cyclic. ••• in a static way. e. if free buffers are available within these subchannels).

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