3Com 3C16470B User Manual - Page 2

HOW TO USE THE BASELINE 10/100 SWITCH 1 1 45 89 12 13 16 17 20 21 24 6 23 4 5 Numbered elements in this diagram refer to numbered sections in the text. A 24-port unit is shown. Front Panel 1 24 RJ-45 10/100 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. 10BASE-T/100BASE-TX Ports The Baseline 10/100 Switch has 16 (3C16470) or 24 (3C16471) 10/100 Mbps auto-negotiating ports. To connect a device to the Baseline 10/100 Switch, use Category 5 unshielded or shielded (screened) 100 Ohm TP cable (or Category 3 cable for a 10 Mbps 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. Each port on the Baseline 10/100 Switch is auto-negotiating: its speed and duplex mode (half duplex or full duplex) are automatically determined by the capabilities of the connected device. 2 Each port supports automatic MDI/MDI-X detection and can be connected to either a 10BASE-T or a 100BASE-TX device. 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. Priority Level Traffic Type 0 Best Effort 1 Background 2 Standard (spare) 3 Excellent Effort (business critical) 4 Controlled Load (streaming multimedia) 5 Video (Interactive media), less than 100 millisecondsn latency and jitter. 6 Voice (Interactive voice), less than 10 milliseconds latency and jitter. 7 Network Control Reserved traffic The traffic prioritization feature supported by the Switch is compatible with the relevant sections of the IEEE 802.1D standard (incorporating IEEE 802.1p). If you connect two Baseline 10/100 Switch units together, the link between them operates at 100 Mbps full duplex. You must use Category 5 cable when connecting the units.