Pulse or digital communications – Repeaters – Testing
Patent
1985-08-12
1988-02-16
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
178 71R, 375 36, H04L 2520
Patent
active
047260343
ABSTRACT:
For the extension of busses use is made of special bus driver and receiver circuits which are capable of charging or discharging the higher capacitances of longer bus lines more quickly. However, in such circuit arrangements the direction is reversed by means of special control signals so that data transmission always takes place always in only one direction; or in other known circuits the reversal is liable to give rise to interference signals. In accordance with the invention, each bus of a local sub-system is connected to the control input of a transistor, notably a PNP-transistor whose collector is connected to 0 V and whose emitter is connected to the extended bus and, via a resistor, to +U. Moreover, between the emitter and the base there is connected a resistor which represents the pull-up resistor for the signals produced on the bus, the signals arriving via the extended bus are coupled onto the bus of the sub-system via this resistor. Unproblematic reversal of the transmission direction is thus possible.
REFERENCES:
patent: 3600696 (1971-08-01), Grandmont
patent: 3718780 (1973-02-01), Oya et al.
patent: 3851098 (1974-11-01), Pingault
patent: 4238737 (1980-12-01), Yokoyama
patent: 4300018 (1981-10-01), Rademaker
Hesse Winfried F.
Schillhof Udo F.
Barschall Anne E.
Briody Thomas A.
Haken Jack E.
Safourek Benedict V.
U.S. Philips Corporation
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