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The numbers in this diagram refer to numbered sections in the
text.
Front Panel
1
24 RJ-45 10/100 Ports and 1 RJ-45 1000 Port
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. Either
shielded or unshielded data cables with shielded or
unshielded jacks can be connected to these data sockets.
AVERTISSEMENT: Les ports RJ-45.
Il s’agit de prises
femelles blindées de données RJ-45. Vous ne pouvez pas
les utiliser comme prise de téléphone. Branchez unique-
ment des connecteurs de données RJ-45 sur ces prises
femelles. Les câbles de données blindés ou non blindés,
avec les jacks blindés ou non blindés, l’un ou l’autre, peu-
vent être branchés à ces prises de courant de données.
WARNUNG: RJ-45-Anschlüsse.
Dies sind abgeschirmte
RJ-45-Datenbuchsen. Sie können nicht als Telefon-
anschlußbuchsen verwendet werden. An diesen Buchsen
dürfen nur RJ-45-Datenstecker angeschlossen werden.
Diese Datenstecker können entweder mit abgeschirmten
oder unabgeschirmten Datenkabeln mit abgeschirmten
oder unabgeschirmten Klinkensteckern verbunden wer-
den.
10BASE-T/100BASE-TX Ports
The Baseline 10/100 Switch 24 Port 10BASE-T/100BASE-TX plus
1-Port 1000BASE-T has 24 10/100Mbps auto-negotiating ports.
Ports 1–23 are MDIX ports. Each can be connected to a device
with an MDI port (such as a workstation) using a normal ‘straight
through’ TP (twisted pair) cable. Alternatively, you can connect to
a device with MDIX ports using ‘cross-over’ TP cable.
Port 24 is ‘switch selectable’ MDI/MDIX using the MDI switch, as
described in
2
. Using this port, you can connect to any other
device without the need for ‘cross-over’ cable.
Ports 1 to 24 are auto-negotiating: their speed and duplex mode
(half duplex or full duplex) are automatically determined by the
capabilities of the connected device. Each port can be connected
to either a 10BASE-T or a 100BASE-TX device.
CAUTION:
The Baseline 10/100 Switch supports full
duplex auto-negotiation. If the connected device does not
support auto-negotiation, the Switch will operate in half
duplex mode (even if the device is operating in full duplex
mode). In such a configuration, you may notice some
degradation of network performance. 3Com recommends
that you use devices that are capable of auto-negotiation
(and that you ensure that auto-negotiation is enabled, if
it is a configurable option).
1000BASE-T Port
Port 25 is a 1000BASE-T port capable of auto-negotiation with
the connected port to operate at 1000BASE-T full duplex. It
auto-senses an MDI/MDIX connection and can be used to connect
to either another 1000BASE-T switch port or to a 1000BASE-T
server or workstation without additional configuration.
Connecting to a Network Device
To connect a device to the Baseline 10/100 Switch 24 Port
10BASE-T/100BASE-TX plus 1-Port 1000BASE-T, use Category 5
unshielded or shielded (screened) 100 Ohm TP cable (or
Category 3 cable for a 10Mbps connection). The maximum length
of cable for each connection is 100m (328ft). Connect one end of
the cable to an RJ-45 port on the Baseline 10/100 Switch, and
the other end to the appropriate RJ-45 port on the connecting
device.
Connecting to another Switch or Hub
If you connect two Baseline 10/100 Switch 24 Port
10BASE-T/100BASE-TX plus 1-Port 1000BASE-T units
together, 3Com recommends that you use the
1000BASE-T ports on both units for the link. You must
use Category 5 cable when connecting the units.
1000BASE-T connection:
To connect a Baseline 10/100 Switch
24 Port 10BASE-T/100BASE-TX plus 1-Port 1000BASE-T to
another Switch using the 1000BASE-T port, use a normal ‘straight
through’ cable and connect each end to the 1000BASE-T port on
each unit.
100BASE-TX connection:
To connect the Baseline 10/100 Switch
24 Port 10BASE-T/100BASE-TX plus 1-Port 1000BASE-T to a
SuperStack 3 hub using a normal ‘straight through’ cable,
connect any port on the Baseline 10/100 Switch 24 Port
10BASE-T/100BASE-TX plus 1-Port 1000BASE-T to the MDI/MDIX
port on the hub, as shown below. Ensure that the MDI switch on
the hub is in (MDI).
An alternative method of connecting the Baseline 10/100 Switch
to a hub using a normal ‘straight through’ cable is to connect any
MDIX port on the hub to the MDI/MDIX port on the Baseline
10/100 Switch, ensuring that its MDI Switch is set to in (MDI).
You can use ‘cross-over’ TP cable to connect any MDIX port on
the Baseline 10/100 Switch to any MDIX port on a hub.
H
OW
TO
U
SE
THE
B
ASELINE
10/100 S
WITCH
24-P
ORT
!
2