Douglas Steven Schmidt

Author:

Douglas C. Schmidt

ISBN #:

0201604647

Author:

Douglas C. Schmidt

ISBN #:

0201607344

Author:

Douglas C. Schmidt

ISBN #:

0201633566

Author:

Douglas C. Schmidt

ISBN #:

0201795256

Author:

Douglas C. Schmidt

ISBN #:

0470059028

Author:

Douglas C. Schmidt

ISBN #:

0471248754

Author:

Douglas C. Schmidt

ISBN #:

0471486485

Author:

Douglas C. Schmidt

ISBN #:

0471606952

US Patent:

58780270, Mar 2, 1999

Filed:

Feb 13, 1997

Appl. No.:

8/799888

Inventors:

Douglas C. Schmidt - Holmdel NJ

Assignee:

AT & T Corp - Middletown NJ

International Classification:

H04L 1226

US Classification:

370232

Abstract:

The rate at which messages are transmitted through a network (10) is monitored to first determine whether a statistically significant number of messages occurred within a prescribed interval. If so, then the number of messages within the interval is compared to a threshold representing an intolerable threshold established on a probabilistic basis. Should the number of messages exceed the threshold, an alarm is generated.

US Patent:

55131859, Apr 30, 1996

Filed:

Nov 23, 1992

Appl. No.:

7/979958

Inventors:

Douglas C. Schmidt - Holmdel NJ

Assignee:

AT&T Corp. - Murray Hill NJ

International Classification:

G06F 1100

US Classification:

371 55

Abstract:

An error rate monitor determines, on a safe and effective basis, when a transmission link is experiencing excessive errors and should be taken out of service. Safety is assured by performing a changeover when the amount of data awaiting transmission via the link gets too high; effectiveness is assured by keeping the link in service despite short term error bursts that can be overcome by data retransmission. In one monitor arrangement, errors that occur in the transmission link during a fixed time interval are monitored. If one or more errors occur in an interval, an increment is added to a counter (originally initialized to zero). If no errors occur in the interval, a decrement is subtracted from the counter, to a minimum of zero. The increment and decrement values are determined as a joint function of (a) the round trip delay on the transmission link, (b) the maximum allowable error rate on the link, and (c) the link speed, so that, in general, the increment and decrement values are significantly different. When the counter exceeds a given threshold, T, a changeover is declared.

US Patent:

49595555, Sep 25, 1990

Filed:

Apr 27, 1989

Appl. No.:

7/345274

Inventors:

Douglas C. Schmidt - Summit NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01J 1982
H03K 326

US Classification:

307219

Abstract:

Proposed is an interconnection medium which is tolerant of faults in at least one of the conductors. Redundancy is established to components connected to the medium by providing additional conductors and steering the signals between components to appropriate conductors in the event of a fault. Preferably, the conductors are arranged in a way which balances the amount of additional wiring and the amount of added parasitic loading.