3com 3C16721A 用户手册
14
Connecting 100BASE-TX Hubs
You can connect two OfficeConnect hubs together, as seen
in Figure 4, with 100BASE-TX in a number of ways, but for
simplicity we recommend the following method:
in Figure 4, with 100BASE-TX in a number of ways, but for
simplicity we recommend the following method:
1
Connect the highest-number port (port 4 on Hub 4,
port 8 on Hub 8, port 12 on Hub 12) of the lower hub
to any port of the upper hub.
port 8 on Hub 8, port 12 on Hub 12) of the lower hub
to any port of the upper hub.
2
Set the Uplink/Normal switch on the lower hub to Uplink
(in). If you use the highest-number port of the upper hub
ensure that its Uplink/Normal Switch is set to Normal.
(in). If you use the highest-number port of the upper hub
ensure that its Uplink/Normal Switch is set to Normal.
Figure 4 Correct Hub Connections Using 100BASE-TX
Connecting to 10BASE-T Networks
Your OfficeConnect Hub can be connected to a 10BASE-T
network through an OfficeConnect switch (for example, an
OfficeConnect Dual Speed Switch 8).
network through an OfficeConnect switch (for example, an
OfficeConnect Dual Speed Switch 8).
Checking Hub Connections
When you have connected your hubs, power them on. The
Port Status LEDs for the ports you have used on the hubs
should be green. If they are not, check your connections
and the settings of the Uplink/Normal switches.
Port Status LEDs for the ports you have used on the hubs
should be green. If they are not, check your connections
and the settings of the Uplink/Normal switches.
Spot Checks
At frequent intervals, visually check that:
■
The Alert LED is off — this is the best way to find out if
there are problems with your network.
there are problems with your network.
■
Case vents are not obstructed.
■
Cabling is secure and not pulled taut.
8
1X
1X
Uplin
k/Norm
al
Switch set to
Uplink (in)
Switch set to
Normal (out)
100BASE-TX cable
with RJ-45 connectors
POW
ER
POW
ER
Upl
ink/Nor
mal
3C16721.book Page 14 Wednesday, July 7, 1999 3:05 PM