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Please specify your question about PEM - 7750 SR-7 AC PEM - SLOT 1/2 7750 SR-7 AC Power Entry Module (PEM) for Slot 1 or Slot 2. Requires paired 7750 SR 7 slot AC Power Supply Unit (PSU). One (1) AC PEM/PSU pair required per chassis for AC power. Two (2) AC PEM/PSU pairs provide 1+1 redund *