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To edit the Availability Schedule for a PACS, click the "Schedule" link for that PACS in the table above. The following dialog will open: 

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This view represents a weekly usage schedule, with all 24 hours of each day represented. By default, a new PACS configuration starts out with a single time interval – represented by a blue bar – covering a full 24-hour day for each day of the week. Availability scheduling has three major chokepoints: 1) start and end time for each time interval, 2) "threads," and 3) "utilization." These concepts will likely be familiar to your PACS Network Administrator, but here is what they mean in XNAT: 

Start and End Time

12:00 am / midnight

(All day)

A defined time interval for a given day has a set start time and a set end time. For example, a PACS administrator might define three time intervals for a given weekday: 

  • 12:00am to 8am (Low use)
  • 8am to 6pm (High use – restrict data flow to XNAT)
  • 6pm to Midnight (Low use)

Note: Time intervals cannot overlap. (i.e., you can't define one interval from 6am to 11am, and another interval from 9am to 3pm in the same day.)  

Threads1This setting refers to how many DICOM requests you can make simultaneously. 

This setting refers to your data transfer rate, and tells XNAT whether it should stream data continuously, or insert pauses between file requests. Here is how this works in practice: 

  • 10% Utilization: a download that takes 1 second would be followed by 9 seconds of waiting
  • 50% Utilization: a download that takes 1 second would be followed by 1 second of waiting
  • 100% Utilization: a download that takes 1 second would be immediately followed by another download, with 0 seconds of waiting 

Here's how to adjust these settings for each time interval in a given day.