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This soft copy for use by IBM employees only.
Note:
1In this case assuming an even distribution of three workstations per
segment on each of 16 available Ethernet segments.
2Calculated by dividing the total bandwidth available after the change
by the original bandwidth available per device, which was calculated by
dividing the total bandwidth available by the number of devices sharing it.
In this case, the original bandwidth calculation is: 10,000 Kbps/segment *
1 segment / (40 users + 4 servers) = 227 Kbps/device. To be fair, this is
a nominal value: in reality, the available bandwidth on a shared Ethernet
segment rarely exceeds 40-50% of the rated bandwidth because of
collisions and re-transmissions.
3This is an average value. The four segments with one device would
actually receive 10,000 Kbps/device, while the remaining 12 segments
would have two devices a piece, each receiving 5,000 Kbps.
Table 11 (Page 2 of 2). Bandwidth Improvement with Ethernet LAN Switch Module
Device Maximum Bandwidth Available (Kbps) Bandwidth
Improvement
Ratio2
Server
Offload
ATM
Server
Micro-
segment
-ation1
ATM25
Offload
Ethernet Desktop 250 250 4000 57143 25x
ATM Desktop 250 250 4000 25000 110x
80 ATM Workgroup Solutions: Implementing the 8285 ATM Switch