3Com SuperStack II Baseline Dual Speed Hub 12-Port TP Manuel de l'utilisateur - Page 2
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Figure 1
Numbered elements in this diagram refer to numbered sections in the text. A 24-port Hub is shown.
Front Panel
1
12 or 24 RJ-45 10/100 Ports
You can use these ports to connect 10BASE-T or 100BASE-TX
devices (workstations and other equipment) to the Baseline Dual
Speed Hub. As the ports are autosensing, the speed of the ports is
determined automatically when you connect your equipment.
WARNING: RJ-45 ports. These are shielded RJ-45 data
sockets. They cannot be used as telephone sockets. Only
connect RJ-45 data connectors to these sockets.
AVERTISSEMENT: Les ports RJ-45. Ceux-ci sont les prises
de courant de données RJ-45 protégées. Ils ne peuvent pas
être utilisés comme prises de courant téléphoniques.
Brancher seulement les connecteurs RJ-45 de données à ces
prises de courant.
WARNUNG: RJ45-Anschlüsse. Hierbei handelt es sich um
abgeschmirte RJ-45 Datenbuchsen, die nicht als
Telefonbuchsen verwendbar sind. Nur RJ-45
Datensteckverbinder an diese Buchsen anschließen.
Connect one end of the TP (twisted pair) cable to the RJ-45 port on
the Baseline Dual Speed Hub and the other end to the appropriate
RJ-45 port on the device. Use either shielded or unshielded data
cables (with shielded or unshielded jacks) to connect to the devices.
The equipment that is connected to the Baseline Dual
Speed Hub must not be set to operate in full duplex mode.
It must be set to operate in autonegotiate or half duplex
mode.
10BASE-T
To connect 10BASE-T equipment, use 10BASE-T Category 3 or
Category 5 unshielded or shielded (screened) 100 Ohm TP cable.
Category 5 cable should be used with this product in
structured wiring environments. This will ensure correct
operation of all ports at 10 Mbps or 100 Mbps.
Ethernet Network Configuration Rules
To remain within IEEE 802.3 10 Mbps Ethernet rules, the maximum
length of cable between the Baseline Dual Speed Hub and an
attached device must not exceed 100 m (328 ft). If you are
connecting multiple hubs in series, ensure that there are no more
than four 10 Mbps hubs between any two devices on your network,
as shown below.
100BASE-TX
To connect 100BASE-TX equipment, use 100BASE-TX Category 5
unshielded or shielded (screened) 100 Ohm TP cable.
U
B
SE THE
ASELINE
2
D
S
UAL
PEED
Fast Ethernet Network Configuration Rules
To remain within IEEE 802.3 100 Mbps Fast Ethernet rules, the
maximum length of cable between the Baseline Dual Speed Hub and
an attached device must not exceed 100 m (328 ft). Ensure that
there are no more than two 100 Mbps hubs between any two
devices on your network, and that the total cable distance (A+B+C)
between the two devices does not exceed 205 m (672.4 ft), as
shown below.
If you connect two Baseline Dual Speed Hubs together, the
link between them operates at 100 Mbps.
2
MDI Switch
This switch affects port 12 (3C16592A) or port 24 (3C16593A).
Ports 1–11 (3C16592A) or 1–23 (3C16593A) are fixed as MDIX
ports. Each can be connected to a device with an MDI port (such as
most workstations) using a normal "straight through" TP cable.
Port 12 or 24 is "switch selectable" using the MDI switch:
Out
In this position, port 12 or 24 is an MDIX port.
It can be connected to a device with an MDI
port (such as most workstations) using a normal
MDIX
"straight through" TP cable.
In
In this position, port 12 or 24 is an MDI port.
It can be connected to an MDIX port on a
MDI
device (such as another hub) using a normal
"straight through" TP cable.
To connect the hub to a 10 Mbps or 100 Mbps unit, connect an
MDIX port on the unit to port 12 or 24 on the Hub, as shown
below. Ensure that the MDI switch on the Hub is in (MDI). If an
MDI/MDIX port is used on the other unit, ensure that the MDI switch
for that port is out (MDIX). Alternatively, you can use "cross-over"
TP cable to connect any MDIX port on the Baseline Dual Speed Hub
to any MDIX port on another unit.
H
UB