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In the tier-1 historian modem configuration, the tier-1 historian receives 3,000 tags from I/O Servers of the following types with average update rate 300 items per second:

• 1,500 4-byte analog delta tags (1,400 always fitting the real-time window and 100 falling outside of the real-time window being 50 minutes late)

• 1,350 1-byte discrete delta tags

• 150 variable-length string delta tags of 32 bytes each