EP0345584A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for hot removal from/insertion to a connection bus of a non removable media magnetic recording unit
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1989-05-27
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Granted: —
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Expires: 2009-05-27
Abstract
Abstract Apparatus for hot removal from/insertion to a connection bus of a non removable media magnetic recording unit, comprising a plurality of electromagnetic switches for isolation of the signal terminals of the unit from the bus, thereby preventing noise injection into the bus, control and timing circuits for deenergization of the unit only after opening of the switches and for enabling removal of the unit only after deenergization and circuits for imparting to the signal terminals of the unit a bias voltage intermediate or close to the electrical signal levels present on the bus, the insertion occurring by closing the switches when the unit is already powered and the terminals are biased so as to minimize the amplitude of the noise injected onto the bus.
Inventors
- 👤 Bruno Mattavelli
- 👤 Giuseppe Pandolfo
- 👤 Cesare Losi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:49
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
284 words
1) Apparatus for hot removal from/insertion to a connection bus of a non removable media magnetic recording unit, comprising: - a housing having a first connector with a first set of teminals connected to said bus, a second set of terminals connected to voltage sources and a third set of terminals, - a container removably inserted in said housing and having a second connector for coupling with said first connector, said second connector having a first, a second and a third set of terminals corresponding to the sets of terminals of said first connector, said container containing a) a recording unit having a first set of terminals for connection to said bus, a second set of terminals for connection to voltage sources, a third set of terminals for unit identification by means of straps selectively connecting said unit identification terminals, and b) direct electrical connection means of said third terminal set of said unit to said third terminal set of said second connector, - means for electrically connecting said second terminal set of said unit to said bus, through said first, said second connector and a corresponding plurality of switches, - electrical bias means for said second set of unit terminals, and - control and timing means for activation of said unit when said container is housed in said housing, by first connecting said second set of unit terminals to at least a powering voltage source and by subsequently closing said plurality of switches, and for deactivation of said unit by first opening said plurality of switches and by subsequently disconnecting said second set of unit terminals from at least one of said voltage sources, for subsequent removal of said container from said housing.
Claim 2
Dependent Claim
284 words
1) Apparatus for hot removal from/insertion to a connection bus of a non removable media magnetic recording unit, comprising: - a housing having a first connector with a first set of teminals connected to said bus, a second set of terminals connected to voltage sources and a third set of terminals, - a container removably inserted in said housing and having a second connector for coupling with said first connector, said second connector having a first, a second and a third set of terminals corresponding to the sets of terminals of said first connector, said container containing a) a recording unit having a first set of terminals for connection to said bus, a second set of terminals for connection to voltage sources, a third set of terminals for unit identification by means of straps selectively connecting said unit identification terminals, and b) direct electrical connection means of said third terminal set of said unit to said third terminal set of said second connector, - means for electrically connecting said second terminal set of said unit to said bus, through said first, said second connector and a corresponding plurality of switches, - electrical bias means for said second set of unit terminals, and - control and timing means for activation of said unit when said container is housed in said housing, by first connecting said second set of unit terminals to at least a powering voltage source and by subsequently closing said plurality of switches, and for deactivation of said unit by first opening said plurality of switches and by subsequently disconnecting said second set of unit terminals from at least one of said voltage sources, for subsequent removal of said container from said housing.
Claim 3
Dependent Claim
61 words
2) Apparatus as claimed in claim 1 where said switches are electromagnetic switches and said bias means consists, for each terminal of said second set of unit terminals, in a voltage divider connected between a powering voltage and ground to impart to said second set of unit terminals a voltage intermediate to two possible extreme voltage levels present on said bus.
Claim 4
Dependent Claim
44 words
3) Apparatus as claimed in claim 1, comprisin further mechanical lock means controlled by said control and timing means to prevent removal of said container from said housing during the whole time said unit is powered by at least one of said voltage sources.
Claim 5
Dependent Claim
18 words
4) Apparatus as claimed in claim 1 wherein said control and timing means are housed in said container.
References Cited (Backward Citations)
No citation records indexed.
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