3Com 100 TX - Manual (Page 41)

Topology Rules 4-3
One Class I Repeater A total network span of 260.8 meters (combined UTP and fiber cabling) is
allowed in single-Class I hub topologies (one hub stack per wiring closet with
a fiber run to the collapsed backbone). For example, you could use a
160.8-meter fiber downlink from the hub to a router, bridge, or switch with a
100-meter maximum UTP run from the hub to the desktops. (See Figure 4-2.)
Figure 4-2 Connecting the Hub in a Network Span of 260.8 Meters
The maximum network span using only UTP cabling is 200 meters. If only
fiber cable is used, the maximum span in 272 meters.
UTP cable 100
meters maximum
LinkBuilder
FMS 100 Hub
(class I)
Fiber backbone
(160.8 meters maximum)
Router, bridge,
or switch
® LinkBuilder R EPEATER
1x 1x 1x 1x 1x 1x 1x
100BT
STATUS
1x 1x 1x 1x 1x
1 2 3 4 5 6 7 8 9 10 11 12 13
ACTIVITY
UNIT LINE PARTITION
CLS2 3C250/ Ι
CLS1 PWR
FAN FAIL OVERTEMP COLLISION
®