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7.6 A Simple Model 2 Configuration Example

Interframe Gap Shrinkage

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Since there are only two segments, we only have to look at a single transmitting end segment when calculating the interframe gap shrinkage. There are no middle segments to deal with, and the receive end segment does not count in the interframe gap calculations. Since both segments are the same segment type, finding the worst-case value is easy. According to Table 7.2, the interframe gap value for all link segments except 10BASE-FB is 10.5 bit times, and that becomes our total shrinkage value for this worst-case path. This is well under the 49 bit times of interframe shrinkage that is allowed for a 10-Mbps network.

As you can see, a network with a single repeater hop and whose worst-case delay path includes two maximum-length 10BASE-FL segments meets both the round trip delay requirements and the interframe shrinkage requirements, and is a valid network according to the Model 2 configuration method.

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Quick Reference Guide to 10-Mbps Multi-Segment Configuration - 09 SEP 95

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