3Com SuperStack 4 3C16479 User Manual

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3Com SuperStack 4 3C16479 User Manual Manual pdf 2 page image

The numbers in this diagram refer to numbered sections in thetext. A 24-port unit is shown.Front Panel1 24 RJ-45 10/100/1000 PortsWARNING : RJ-45 ports. These are shielded RJ-45 datasockets. They cannot be used as standard traditionaltelephone sockets, or to connect the unit to a traditionalPBX or public telephone network. Only connect RJ-45data connectors, network telephony systems, or networktelephones to these sockets. Either shielded orunshielded data cables with shielded or unshielded jackscan be connected to these data sockets.AVERTISSEMENT: Les ports RJ-45. Ceux-ci sontprotégés par des prises de données. Ils ne peuvent pasêtre utilisés comme prises de téléphone conventionnellesstandard, ni pour la connection de l’unité à un réseautéléphonique central privé ou public. Raccorderseulement connecteurs de données RJ-45, systèmes deréseaux de téléphonie ou téléphones de réseaux à cesprises. Il est possible de raccorder des câbles protégés ounon protégés avec des jacks protégés ou non protégés àces prises de don.WARNUNG : RJ-45-Porte. Diese Porte sind geschützteDatensteckdosen. Sie dürfen weder wie normaletraditionelle Telefonsteckdosen noch für die Verbindungder Einheit mit einem traditionellem privatem oderöffentlichem Telefonnetzwerk gebraucht werden. NurRJ-45-Datenanscluße, Telefonnetzsysteme orNetztelefone an diese Steckdosen anschließen. Entwedergeschützte oder ungeschützte Buchsen dürfen an dieseDatensteckdosen angeschlossen werden.The Switch has 24/16 10/100/1000 Mbps auto-negotiating ports.Each port automatically negotiates with the attached device todetermine the correct speed and duplex mode of operation.Once negotiated, the port will operate in one of the followingmodes: 10BASE-T half duplex 10BASE-T full duplex 100BASE-TX half duplex 100BASE-TX full duplex 1000BASE-T full duplexCAUTION: The Switch supports full duplexauto-negotiation. If the connected device does notsupport auto-negotiation, the Switch will operate in halfduplex mode, and therefore can only operate at 10Mbps or 100 Mbps. In such a configuration, you maynotice some degradation of network performance.3Com recommends that you use devices that arecapable of auto-negotiation (and that you ensure thatauto-negotiation is enabled, if it is a configurableoption).All ports auto-sense an MDI/MDIX connection so each port canbe connected to a device with a normal ‘straight through’ TP(twisted pair) cable or a ‘cross-over’ TP cable. Any port cantherefore be used to connect to either another switch port,server, or workstation without additional configuration.Traffic PrioritizationThe Switch offers priority queuing, which means all packets thatare received are examined to see if they have been priorityencoded. When a packet is received, the Switch will read thepriority level and determine the appropriate channel to forwardthe packet based on the priority level. This feature can be useful,for example, during excessive loads when one type of traffic mayrequire priority over another. The Switch is configured to complywith 802.1p, VLAN tagged frames.Traffic prioritization ensures that high priority data is forwardedthrough the Switch without being delayed by lower priority data.It differentiates traffic into classes and prioritizes those classesautomatically. Traffic prioritization uses the multiple traffic queuesthat are present in the hardware of the Switch to ensure thathigh priority traffic is forwarded on a different queue from lowerpriority traffic, and is given preference over that traffic. Thisensures 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. Thepriority levels and their traffic types are shown in the followingtable.FEATURES OF THE SWITCH5 3 4211134165178 920 213C16479Switch 28241224 Link/Activity : Green = 1000M, Yellow = 10/100M,Flash = Activity, Duplex : On = Full, Off = Half!2