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Designing and Expanding the Network 2 - 17
4. Each 10BASE-FL Module counts as one half of a repeater. The 802.3
specification limits the number of repeaters between any two
network stations to 4. This restricts the number of serially-connected
10BASE-FL Modules to a maximum of 8.
Note: The Ethernet 4-repeater rule limits the number of repeaters
between any two transceivers to 4. In general, this restricts
most vendor configurations to a maximum of 4
concentrators connected in series.
5. Rule number 1 does not include AUI cables of up to 50 meters. Thus,
the total network diameter between 10BASE-FL Ethernet nodes can
be 3740 meters (4200 m - 560 m + 50 m + 50 m = 3740 m) through a
single concentrator.
Figure 2-5 shows an example of an all-10BASE-FL network
.
Figure 2-5. All-10BASE-FL Network with 3 Concentrators
500 m ?
Concentrator C
Concentrator A
1 km
500 m
Transceiver
A
Transceiver
B
Concentrator B