By E. V. Hoversten (auth.), Joachim Majus, Otto Spaniol (eds.)
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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Additional resources for Data Networks with Satellites: Working Conference of the Joint GI/NTG working group ”Computer Networks”, Cologne, September 20.–21., 1982
E. if free buffers are available within these subchannels). This situation (blocking of subchannels due to malfunctioning periods of other subchannels) is called 'interblocking' and persists until a sender buffer of the late subchannel becomes free. It should be noted that the static acceptance rule implies a global flow control mechanism in the following way: Ws sender buffers are available for each of the M subchannels, thus at most W: =Ws·M frames will be accepted for transmission without having received a positive acknowledgement for the first one.
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. These restrictions and the relatively small window sizes are not very serious for terrestrial HOLC links which have a very small propagation delay (usually not much higher than frame transmission time). Performance of HOLC has been shown to be very satisfactorily as demonstrated in several papers ( [BKT U, [BKT 2J ' [GL~ , [L~ ).
In mind that a highe~ laye~ ~ega~ds the lowe~ laye~s as a "black box", i. e. it does not ca~e whe~e o~ by which lowe~ laye~ a ce~tain function is pe~fo~med, it seems to be obvious that the se~vices offe~ed by the netwo~k laye~ must be pe~fo~med, at least f~agmenta~ily, by one of the laye~s 1 - 3 below (Figu~e 3). Othe~wise, no one-to-one mapping of the facilities to one of the facilities of the othe~ is possible o~, in othe~ wo~ds, the inte~connection of subnetwo~ks offe~ ing diffe~ent se~vices to thei~ use~s is eithe~ impossible o~ at least ext~emely complicated.