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Black Box LH1500 Media Converters Installation and User Guide (08/05)
27
Table 3.2.2b: Worst case round-trip delay for Fast Ethernet device components*
Component Round-trip delay in Bit Times (BT)
2 TX DTEs
100
2 FX DTEs
100
1 FX and 1 TX DTE
100
2 T4 DTEs
138
1 T4 and 1 TX or FX DTE
127
Class I Repeater
140
Class II Repeater with any
combination of TX and FX ports
92
Class II Repeater with T4 ports
67
*Worst case delays taken from IEEE Std 802.3u-1995.
To determine whether a prospective network topology adheres to the collision
domain diameter specification, the following formula should be applied to the worst case
path through the network. The worst case path is the path between the two Fast Ethernet
devices (DTEs) which have the longest round trip delay time.