The numbers in this diagram refer to numbered sections in the text.
Front Panel
18 RJ-45 10/100/1000 Ports
WARNING: RJ-45 ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones 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.Ceux-ci sont protégés par des prises de données. Ils ne peuvent pas être utilisés comme prises de téléphone conventionnelles standard, ni pour la connection de l’unité à un réseau téléphonique central privé ou public. Raccorder seulement connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou téléphones de réseaux à ces prises. Il est possible de raccorder des câbles protégés ou non protégés avec des jacks protégés ou non protégés à ces prises de don.
WARNUNG: RJ-45-Porte. Diese Porte sind geschützte Datensteckdosen. Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für die Verbindung der Einheit mit einem traditionellem privatem oder öffentlichem Telefonnetzwerk gebraucht werden. Nur RJ-45-Datenanscluße, Telefonnetzsysteme or Netztelefone an diese Steckdosen anschließen. Entweder geschützte oder ungeschützte Buchsen dürfen an diese Datensteckdosen angeschlossen werden.
The Baseline 8 Port Gigabit Switch has 8 10/100/1000 Mbps auto-negotiating ports. Each port automatically determines the correct speed and duplex mode as one of the following:
10BASE-T half duplex
10BASE-T full duplex
100BASE-TX half duplex
100BASE-TX full duplex
1000BASE-T full duplex
CAUTION: The Baseline 8 Port Gigabit Switch supports !
full duplex auto-negotiation. If the connected device
does not support auto-negotiation, the Switch will operate in half duplex mode (only for 10BASE-T and 100BASE-TX). 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).
All ports auto-sense an MDI/MDIX connection and can be used to connect to either another switch port, server, or workstation without additional configuration. Each port can be connected to a device with a normal ‘straight through’ TP (twisted pair) cable or a ‘cross-over’ TP cable.
Priority Queuing
The Switch offers priority queuing, which means all packets that are received are examined to see if they have been priority encoded. If a packet has been, then the Switch will read the priority level and determine whether the packet should be directed through the normal or high priority channel. This feature can be useful for example during excessive loads when one type of traffic may require priority over another. The Switch is configured to comply with 802.1p, VLAN tagged frames.
Traffic prioritization ensures that high priority data is forwarded through the Switch without being delayed by lower priority data. It differentiates traffic into classes and prioritizes those classes automatically. Traffic prioritization uses the multiple traffic queues that are present in the hardware of the Switch to ensure that high priority traffic is forwarded on a different queue from lower priority traffic, and is given preference over that traffic. This ensures that time-sensitive traffic gets the highest level of service. The 802.1D standard specifies eight distinct levels of priority
(0 to 7), each of which relates to a particular type of traffic. The priority levels and their traffic types are shown in the following table.
