Multiplex communications – Wide area network – Packet switching
Patent
1983-05-31
1986-04-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 16, 370 60, 370 88, H04J 302, H04J 116, H04Q 1104
Patent
active
045817359
ABSTRACT:
In order to control the transfer of packets of information among a plurality of stations, the instant communications system, station and protocol contemplate first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station reads one signal from a path and writes another signal on the path. The one signal is read by an arrangement which electrically precedes the arrangement for writing the other signal. Packets are transmitted in a regular, cyclic sequence. A head station on a forward path writes a start cycle code for enabling each station to transmit one or more packets. If a station has a packet to transmit, it can read the bus field of a packet on the forward path. Responsive thereto, a logical interpretation may be made as to whether the forward path is busy or is not busy. If the path is not busy, the packet may be written on the path by overwriting any signal thereon including the busy field. If the path is busy, the station may defer the writing until the path is detected as not busy.
In order to accommodate different types of traffic, the head station may write different start cycle codes. For example, a start-of-voice code may enable stations to transmit voice packets; a start-of-data code may enable stations to transmit data packets, etc. for the different types of traffic. Further, the start cycle codes may be written in a regular, e.g., periodic, fashion to mitigate deleterious effects, such as speech clipping. Still further, the last station on the forward path may write end cycle codes in packets on a reverse path for communicating control information to the head station. Responsive to the control information, the head station may modify the cycle to permit the respective stations to, for example, transmit more than one packet per cycle or to vary the number of packet time slots, which are allocated to each of the different types of traffic.
REFERENCES:
patent: 3851104 (1974-11-01), Willard et al.
patent: 4063220 (1977-12-01), Metcalfe et al.
patent: 4161786 (1979-07-01), Hopkins et al.
patent: 4210780 (1980-07-01), Hopkins et al.
patent: 4360910 (1982-11-01), Segal et al.
patent: 4412326 (1983-10-01), Limb
patent: 4439763 (1984-03-01), Limb
patent: 4450554 (1984-05-01), Steensma et al.
patent: 4476559 (1984-10-01), Brolin et al.
patent: 4503533 (1985-03-01), Tobagi et al.
Ser. No. 399,428, filed 7/19/82, Flores et al.
Proceedings Computer Network Protocols Symposium, Feb. 13-15, 1978, "The Mininet Inter-Node Control Protocol", R. C. S. Morling et al., pp. B4-1-B4-6.
Proceedings of the Local Area Communications Network Symposium, May 1979, "Multimode Communications on the MITRENET", G. T. Hopkins, pp. 169-177.
EEM Electron Eng Mas, 1980/81, vol. 2, 1980, "Directional Couplers", as Manufactured by Mini-Circuits, pp. 3112-3115.
Performance of Data Communication Systems and Their Applications, Pujolle, Sep. 1981.
Local Networks & Distributed Office Systems, Hopkins, 1981.
The Express-Net: A Local Area Communication Network Integrating Voice and Data, Dec. 1980, Tobagi.
Computer Network Protocols, Morling et al., Feb. 1978.
Globecom '82, IEEE, vol. 1.
Local Area Communications Network, Meisner & Rosenthal, May 1979.
Directional Couplers, ZFDC Series, 1980.
Map: An Insertion Protocol etc., Marsan and Albertengo, Apr. 1981.
Flamm Lois E.
Limb John O.
AT&T Bell Laboratories
Brendzel Henry T.
Kuntz Curtis
Olms Douglas W.
Roddy Richard J.
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