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Design Notes

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  Protecting and Monitoring Hot Swappable Cards in High Availability Systems &mdash DN360
  PDF, 69 Кб, Файл опубликован: 7 фев 2005
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  Protecting and Monitoring Hot Swappable Cards in High
  Availability Systems – Design Note 360
  David Soo
  Introduction
  Mission critical systems, such as those used by
  п¬Ѓnancial institutions and internet providers, require
  high availability computing equipment. These systems
  duplicate or make redundant certain functional blocks
  in the system. This allows the system to operate on
  the backup elements when blocks fail. High availability
  systems typically place these blocks into separate cards
  that can be swapped out if they fail or show signs of
  trouble. This requires sophisticated monitoring to
  determine when a functional block has failed and if a
  back-up is operating.
  Redundant Power
  Often the reliability of the power distribution is improved
  by providing two supplies to each card. Each supply
  is fuse protected and then diode OR’ed to form one
  supply rail for the card. To further increase reliability,
  the voltage and current information is monitored for
  power usage and usage history. This allows the system
  to determine if the card is using its allotted power or …

Статьи

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  Hot Swap for High Availability Systems &mdash LT Journal
  PDF, 266 Кб, Файл опубликован: 25 мар 2005
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  DESIGN FEATURES Hot Swap for High Availability Systems
  by David Soo Introduction
  Critical computer, mass storage and
  communication systems are designed
  to operate with zero down time, or to
  at least approach that ideal. Such
  high availability systems must continue functioning even when system
  upgrades and maintenance are performed. Often this requires circuit
  boards be inserted into, and removed
  from, a live powered system.
  Hot swapping requires a power
  switch to initially isolate and then
  control inrush current via a controlled
  ramp up of power, which prevents
  any disturbance to the backplane
  and adjacent circuits. Because the
  Hot Swap circuit is the gateway for
  all board power, it is a natural place
  to monitor and collect power supply
  data. Such data reveals the health
  of the board and the integrity of the
  power path.
  With this in mind, the LTC4260 …

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