The numbers in this diagram refer to numbered sections in the text.
Front Panel
124 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
24Port 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
24Port 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.
