6
NOTE FOR MODELS 8020-ST/SC:
The fiber port can be up-linked
to an upper level hub's port. You may use the "1/MPR" port to
up-link the hub to an upper level hub's TP port. Only one up-link
is allowed between any two hubs.
3. Plug the female end of the AC power cord into the receptacle
on the back of the Switch unit. Plug the other end into an AC
power source.
NOTE:
4000-ST/SC models will automatically power ON when
plugged in. The 8020-ST/SC models provide a ON/OFF switch
control on the back of the unit.
2-1.3 Switch Hub Cascading & Long Haul Connections
Theoretically, the switch hub breaks up the collision domain in hub
cascading so you may unlimitedly up-link the hubs. However,
in practice, the network extension (cascading levels & overall
diameter) is limited by the timing requirement (time-out specification)
of your application software and network operating system.
The sum of all elements' bit-time delay and the overall bit-time delay
of wires/devices must be within 512 bit in a 100Base-X network
segment (collision domain). The TP, fiber cables and devices' bit-time
delay (round trip) is as follows:
100Base-TX
100Base-FX
DTE
↔
DTE:
100
DTE
↔
DTE:
100
Cat. 5 TP Wire:
1.112/m
Fiber Cable:
1.0/m
DTE FX to DTE TX: 100
100Base-TX to 100Base-FX Converter: 56
