Welch Allyn Acuity Directions For Use Manual page 19

Directions for use
Paired system CPUs (High-availability pairs) and switchovers
Acuity Systems that typically support at least 29 patients include a high availability (HA)
central processing unit (CPU). The HA CPU is a redundant Acuity System CPU.
An HA CPU assumes control if the Acuity System CPU's operation is interrupted. An HA
CPU "switchover" occurs to ensure minimal loss of Acuity Central Station monitoring
capability. Historical data that had been gathered by the non-operational CPU before the
switchover might not be available for some patients until that CPU becomes operational.
At any one time, displays in a paired CPU system should all receive input from either the
Acuity System CPU or the HA CPU.
To ensure that all displays in a paired CPU system receive input from the same CPU
During normal operating conditions
1. Ensure that none of the displays shows a yellow indicator in the top right corner.
If none shows a yellow indicator, the system is receiving input properly. If any display
shows a yellow indicator, proceed to the next step.
2. On any display with a yellow indicator, press the video input button, generally located
on the front of the display.
All displays now receive input from the Acuity System CPU, and alarms and alerts
appear on all of them. No displays show a yellow indicator.
During interruption of Acuity System CPU operation
1. Ensure that all displays show a yellow indicator in their top right corners.
If any display does not show a yellow indicator, proceed to the next step.
2. On any display without a yellow indicator, press the video input button, generally
located on the front of the display.
All displays now receive input from the Acuity System HA CPU, and they all show a
yellow indicator. If one or more of the displays is blank, or if all Virtual Monitors do not
reappear with their original border colors in approximately five minutes, see
on page 148.
WARNING Whenever an interruption in Acuity System CPU operation occurs,
please contact Welch Allyn Technical Service soon to ensure that your entire
system has returned to normal operating condition and that it does not require
further service.
Chapter 2 Acuity System overview
Yellow indicator: input received from the Acuity System HA CPU.
No yellow indicator: input received from the Acuity System CPU.
Acuity System CPU
Acuity System HA CPU
15
Table 10