3Com SuperStack 3 3C16477 User Manual

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3Com SuperStack 3 3C16477 User Manual Manual pdf 2 page image

The numbers in this diagram refer to numbered sections in thetext.Front Panel1 8 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 Baseline 8 Port Gigabit Switch has 8 10/100/1000 Mbpsauto-negotiating ports. Each port automatically determines thecorrect 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 duplexCAUTION: The Baseline 8 Port Gigabit Switch supportsfull duplex auto-negotiation. If the connected devicedoes not support auto-negotiation, the Switch willoperate in half duplex mode (only for 10BASE-T and100BASE-TX). In such a configuration, you may noticesome degradation of network performance. 3Comrecommends that you use devices that are capable ofauto-negotiation (and that you ensure thatauto-negotiation is enabled, if it is a configurableoption).All ports auto-sense an MDI/MDIX connection and can be usedto connect to either another switch port, server, or workstationwithout additional configuration. Each port can be connected toa device with a normal ‘straight through’ TP (twisted pair) cableor a ‘cross-over’ TP cable.Priority QueuingThe Switch offers priority queuing, which means all packets thatare received are examined to see if they have been priorityencoded. If a packet has been, then the Switch will read thepriority level and determine whether the packet should bedirected through the normal or high priority channel. This featurecan be useful for example during excessive loads when one typeof traffic may require priority over another. The Switch isconfigured to comply with 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.F EATURES OF THE B ASELINE 8 P ORT G IGABIT S WITCH35 411 4 5 82!2