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Back in the day, we used to put 30+ users plus a few line printers (text + barcode) on 19.2Kb leased lines. Formula: Bandwidth = ScreenSize * Screens/Minute * ConcurrentUsers ScreenSize: A 5250 screen maxes out at about 4KB. That's actually download size; uploads IIRC only get the new field data + key stroke used (F-key, Enter, etc.) so the average upload is more likely to be under 1KB. I'll use 4KB as a worst-case. Screens/Minute: Not sure; assuming 5 on average. ConcurrentUsers: 5 Bandwidth = 4KB * 5 Screens/Minute * 5 = 100KB/minute Convert that to the bandwidth measurement units from your DSL provider: 100KB/minute * 1 minute/60 seconds * 8Kb/KB = 13.3 Kb/s You will probably have more to worry about from media streaming, P2P file sharing, & other inappropriate uses than the iSeries stuff.
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