Multiplex communications – Wide area network – Packet switching
Patent
1986-05-22
1987-12-15
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 89, 370108, H04Q 1104, H04J 300, H04J 306
Patent
active
047138076
ABSTRACT:
A system of the local area network (LAN) type using a closed loop optical fibre transmission medium, in which a series of stations, one of which acts as a master station, are connected to the loop. In each TDM cycle, a group of adjacent time slots is used as a framing group which occurs once per cycle of the system, the framing group including a multi-bit group number position which identifies a slot or group of slots. The loop includes a latency buffer to set the loop delay time to exactly 125 micro seconds, and the system according to the invention provides for both circuit-switched and packet-switched connections. To set up a circuit-switched connection, a free slot is chosen and its identity signaled in a packet manner. The proportion of slots allocated to circuit connections is varied dynamically, with indication thereof conveyed in a framing group of slots which occurs once in a cycle.
REFERENCES:
patent: 4251880 (1981-02-01), Baugh et al.
patent: 4538263 (1985-08-01), Gabrielli et al.
patent: 4549291 (1985-10-01), Renoulin et al.
patent: 4553234 (1985-11-01), Brandsma et al.
Caves Keith
Woodman Douglas E.
Olms Douglas W.
Scutch III Frank M.
STC PLC
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