Multiplex communications – Wide area network – Packet switching
Patent
1988-03-16
1989-09-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 370 4, 370 855, 370 941, H04J 302
Patent
active
048667048
ABSTRACT:
An asynchronous, high-speed, fiber optic local area network originally developed for tactical environments with additional benefits for other environments such as spacecraft, and the like. The network supports ordinary data packet traffic simultaneously with synchronous T1 voice traffic over a common token ring channel; however, the techniques and apparatus of this invention can be applied to any deterministic class of packet data networks, including multitier backbones, that must transport stream data (e.g., video, SAR, sensors) as well as data. A voice interface module parses, buffers, and resynchronizes the voice data to the packet network employing elastic buffers on both the sending and receiving ends. Voice call setup and switching functions are performed external to the network with ordinary PABX equipment. Clock information is passed across network boundaries in a token passing ring by preceeding the token with an idle period of non-transmission which allows the token to be used to re-establish a clock synchronized to the data. Provision is made to monitor and compensate the elastic receiving buffers so as to prevent them from overflowing or going empty.
REFERENCES:
patent: 4438520 (1984-03-01), Saitzel
patent: 4706246 (1987-11-01), Kuane
patent: 4790918 (1987-12-01), Miyao
Ansell Edward O.
California Institute of Technology
Olms Douglas W.
Scutch III Frank M.
Streck Donald A.
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