Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1977-07-05
1978-06-06
Stewart, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 15BW, 3401461BA, H04J 316
Patent
active
040938239
ABSTRACT:
A statistical multiplexing system is provided for computer communications, in which asynchronous user messages are transmitted from the individual terminals to the central processor, or other remote location, in random order. The messages are statistically multiplexed, with time slots being assigned in the communication channel as each message is received from the terminals, and with no time slots being assigned for idle periods, which greatly increases channel utilization. A buffer memory is required in the system to temporarily store messages from the terminals at statistical peaks. To improve channel efficiency, several characters for the same terminal may be collected together in the system to form an addressed data sub-block so as to reduce address label requirements. These sub-blocks are assembled into multiplexed data blocks by a microprocessor and stored in the buffer memory. To relieve the microprocessor load, data blocks are transferred from the memory to the transmitter via a direct memory access facility for transmission over the communication channel to the desired destinations. Input rejection controls are provided to avoid overflow of the buffer memory. A demultiplexer is provided in the system which handles multiplexed data blocks received from the remote location and which transfers the received blocks under the control of the microprocessor to the buffer memory by way of the direct memory access facility. The microprocessor initiates positive and negative acknowledgment signals which are sent to the remote location, and it then demultiplexes the correctly received multiplexed data blocks and transfers them to the appropriate output terminal interfaces for distribution to the terminals. The multiplexer is capable of multiplexing messages from both asynchronous and synchronous input terminals. The microprocessor schedules and multiplexes data blocks from synchronous terminals and from asynchronous terminals over the common communication channel to one or more remote locations.
REFERENCES:
patent: 3560936 (1971-02-01), Busch
patent: 3825905 (1974-07-01), Allen
patent: 3927268 (1975-12-01), Sciulli
patent: 3975712 (1976-08-01), Hepworth
patent: 3988674 (1976-10-01), Sciulli
Beecher Keith D.
Stewart David L.
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