3-4
3-5
Hub-to-Hub Uplink
You can link two Hubs or Hub stacks to each other using any of the
twisted-pair ports or the Uplink port. Ordinary twisted-pair ports require
crossover twisted-pair cables; linking one ordinary twisted-pair port and the
Uplink port requires an ordinary straight-through twisted-pair cable.
Expansion bridge port supports 100BASE-TX ( Uplink Port ) distance
extension up to 100 meters, and 100BASE-FX ( Fiber Port ) distance
extension up to 2km in FDX mode.
When connecting two Hubs or Hub stacks in this fashion, due to the increased
speed in Fast Ethernet and adherence to the EIA/TIA 568 wiring rules, the
maximum distance between any two end-stations in a collision domain is lim-
ited to 205 meters. In contrast, the maximum 10BASE-T Ethernet collision
domain can be up to 500 meters.
The following table describes different methods of linking Hubs (or Hub stacks):
♦
♦
♦
♦
♦
Stacked via Stack Ports
In a stack, 16/24-Port 100/10M Dual-Speed Hub can build up to 48 ( or 72 )
nodes, as shown in Figure 3.4.
Plug the stacking cable into the in port of the top hub and into the out port
of the next hub, then repeat this step for each hub in the stack. The link is
starting from the in port of the top hub and ending at the out port of the last
hub.
S tac k 2 (Slav e m ode)
S tac k 3 (Slav e m ode)
S tac k 1 (Mas ter m ode)
O u t
In
O u t
In
In
O u t
STACK PORT
STACK PORT
STACK PORT
Warning Label
Figure 3.4 Rack Mount Hubs ( 16/24 - Port )
Warning !
Owing to version differences, please stack with any other
hub which has this red warning label on it .
Never stack with any other hub without the warning
label on it.
f
a
f
