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cable; a device with a 100BASE-FX port is connected to the DFE-855's
SC jack through a fiber-optic cable; and the supplied AC power adapter is
connected to the DFE-855's DC power jack. The figure shows the
maximum possible distance between the two devices: 2,100 meters. Note
that the network ports on both devices must be explicitly set to full-duplex
mode to allow the use of a cable of up to 2,000 meters long on the
100BASE-FX side.
In the following figure, device B has a fiber optic port.
X
meters
Y
meters
Max. distance Max. distance
Device A
Device B
DFE-855
Figure 2- 2
Mode Device A Device B X Y
Full-duplex DTE(*) DTE 100m 2000m
Half-duplex DTE DTE
X ≤ 100, X + Y ≈ 300
Half-duplex Class I Hub(+) DTE
X ≤ 100, X + Y ≈ 75
Half-duplex Class II Hub(+) DTE
X ≤ 100, X + Y ≈118
Table 2- 1
In the following figure, device B does not have a fiber optic port.
Figure 2- 3
Mode Device A Device B X Y Z
Full-duplex DTE(*) DTE 100m 2000m 100m
Half-duplex DTE DTE
X ≤ 100, X + Y +Z ≈ 230 , Z ≤ 100
Table 2- 2