Multiplex communications – Wide area network – Packet switching
Patent
1984-12-31
1986-10-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04Q 1104
Patent
active
046176578
ABSTRACT:
In a packet data transmission system, correctly received information packets are acknowledged by piggybacking their sequence numbers onto information packets being transmitted. The control field of each information packet includes a bit which indicates whether or not there is a piggybacked acknowledgement. Acknowledgements can also be transmitted separately in control packets having no information field. Each acknowledgement consists of not only the sequence number of a correctly received information packet, but also the acknowledgement status of a plurality of preceding information packets whereby these can be negatively acknowledged if necessary. The sequence numbers can have any one of three different sizes, for efficient transmission of sequence numbers on transmission links of arbitrary transmission speed and length (and hence delay). The sequence number size which is used on any particular transmission link is determined on set-up of the link in dependence upon the transmission speed and the round-trip delay of the link.
REFERENCES:
patent: 4009344 (1977-02-01), Flemming
patent: 4344171 (1982-08-01), Lin et al.
patent: 4536874 (1985-08-01), Stoffel et al.
Baker David M.
Drynan David S.
Haley R. John
Northern Telecom Limited
Olms Douglas W.
Scutch III Frank M.
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