公开(公告)号：CA1211813A

公开(公告)日：1986-09-23

申请号：CA459708

申请日：1984-07-25

Applicant: IBM

Inventor： FALLWELL BEEMAN N JR ,  KALTENBACH MATT A ,  OTT WILLIAM B

IPC: H04L12/26 ,  H04L12/407 ,  H04L11/16 ,  H04L11/12

Abstract: BC9-83-021 HOT CARRIER DETECTION In a local area network for data communications, stations which distributively control their access to a common bus or other medium are able to identify the location of any "hot" station transmitter (one stuck continuously in an "on" condition which cannot be isolated from the medium). Such networks are effectively disabled by a hot carrier, since each station conditions its access on sensing the medium as previously idle. The present "loop test" method permits all stations in the network to quickly establish the location of a hot transmitter, and thereby quickly direct field repair personnel to that location. It also permits operators to take action to physically disconnect the faulty transmitter from the medium, so that the other stations may continue to use the network until the fault is repaired.

公开(公告)号：AU4255085A

公开(公告)日：1986-01-16

申请号：AU4255085

申请日：1985-05-16

Applicant: IBM

Inventor： BRADLEY DAVID J ,  OTT WILLIAM B

IPC: G05B19/05 ,  G06F9/48 ,  G06F13/24 ,  G06F9/46

Abstract: An interrupt interface circuit for interrupt level sharing comprising a pulse generator (36, 38) having an open-collector or tri-state output (40) connected to an external interrupt line shared by other similar circuits. An active internal interrupt signal (Card Unit) causes the pulse generator to pulse. The external interrupt line is fed back and latched on a disabling input of the pulse generator so that any pulse on the external interrrupt line prevents further pulsing. The software handler of the interrupt, upon servicing an interrupt of the interrupt level, causes the enabling of the pulse generator of that level, thereby permitting active internal interrupt signals to produce a further pulse. By this interrupt level sharing, phantom interrupts are eliminated and servicing overhead is minimized.

公开(公告)号：AU571693B2

公开(公告)日：1988-04-21

申请号：AU4255085

申请日：1985-05-16

Applicant: IBM

Inventor： BRADLEY DAVID J ,  OTT WILLIAM B

IPC: G05B19/05 ,  G06F9/48 ,  G06F13/24 ,  G06F9/46

Abstract: An interrupt interface circuit for interrupt level sharing comprising a pulse generator (36, 38) having an open-collector or tri-state output (40) connected to an external interrupt line shared by other similar circuits. An active internal interrupt signal (Card Unit) causes the pulse generator to pulse. The external interrupt line is fed back and latched on a disabling input of the pulse generator so that any pulse on the external interrrupt line prevents further pulsing. The software handler of the interrupt, upon servicing an interrupt of the interrupt level, causes the enabling of the pulse generator of that level, thereby permitting active internal interrupt signals to produce a further pulse. By this interrupt level sharing, phantom interrupts are eliminated and servicing overhead is minimized.

公开(公告)号：CA1226957A

公开(公告)日：1987-09-15

申请号：CA481598

申请日：1985-05-15

Applicant: IBM

Inventor： BRADLEY DAVID J ,  OTT WILLIAM B

IPC: G05B19/05 ,  G06F9/48 ,  G06F13/24 ,  G06F9/46

Abstract: INTERRUPT LEVEL SHARING An interrupt interface circuit for interrupt level sharing comprising a pulse generator having an open-collector or tri-state output connected to an external interrupt line shared by other similar circuits. An active internal interrupt signal causes the pulse generator to pulse. The external interrupt line is fed back and latched on a disabling input of the pulse generator so that any pulse on the external interrupt line prevents further pulsing. The software handler of the interrupt, upon servicing an interrupt of the interrupt level, causes the enabling of the pulse generators of that level, thereby permitting active internal interrupt signals to produce a further pulse. By this interrupt level sharing, phantom interrupts are eliminated and servicing overhead is mimimized.