Redundant termination of a communication line for maintaining th

Details Redundant termination of a communication line for maintaining th Redundant termination of a communication line for maintaining th

1985-04-12

1989-12-26

Faber, Alan

Dynamic information storage or retrieval

Information location or remote operator actuated control

307 64, H02J 900, G11B 5008

Patent

active

048902713

ABSTRACT:
An input and output system has a plurality of tape drives (1-3) connected by a daisy-chained bus (5) to a processor (4). Each of two tape drives (2, 3) at the end of the bus has a terminator (30, 31) for transmit lines (6) of the bus. Each terminator of each line comprises a pull-down resistor (40) connecting the line to ground, and a pull-up resistor (41) and a diode (42) in series connecting the line to a source of potential (43). When a source is powered up, potential is present and a diode connected thereto is forward biased and supplies potential to the line. When the source is powered down and potential is withdrawn, a diode connected thereto becomes reverse-biased and prevents the powered-down source from grounding the line. Redundant termination of each line therefore allows any one tape drive to be powered down without precluding communications over the bus from continuing while the other terminator continues to supply the line with potential.

REFERENCES:
patent: 3999163 (1976-12-01), Levy et al.
patent: 4130899 (1978-12-01), Bowman et al.
patent: 4204249 (1980-05-01), Dye et al.
patent: 4481626 (1984-11-01), Boggs et al.
patent: 4495568 (1985-01-01), Gilbert et al.
P. L. Borrill "Microprocessor Bus Structures and Standards", Proc. 6th Euromicro Symposium on Microprocessing & Microprogramming (Sep. 16-18, 1980, London) pp. 285-296.

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