Magnum 15E Media Converters
Installation and User Guide (07/01)
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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
