3Com 3C16478 Посібник користувача - Сторінка 2

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EATURES OF THE

The numbers in this diagram refer to numbered sections in the

text. A 24-port unit is shown.

Front Panel

24 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

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 Switch has 24/16 10/100/1000 Mbps auto-negotiating ports.

Each port automatically negotiates with the attached device to

determine the correct speed and duplex mode of operation.

Once negotiated, the port will operate in one of the following

modes:

10BASE-T half duplex

10BASE-T full duplex

100BASE-TX half duplex

100BASE-TX full duplex

1000BASE-T full duplex

WITCH

: Les ports RJ-45. Ceux-ci sont

Link/Activity : Green = 1000M, Yellow = 10/100M,

Flash = Activity, Duplex : On = Full, Off = Half

CAUTION: The Switch supports full duplex

auto-negotiation. If the connected device does not

support auto-negotiation, the Switch will operate in half

duplex mode, and therefore can only operate at 10

Mbps or 100 Mbps. 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 so each port can

be connected to a device with a normal 'straight through' TP

(twisted pair) cable or a 'cross-over' TP cable. Any port can

therefore be used to connect to either another switch port,

server, or workstation without additional configuration.

Traffic Prioritization

The Switch offers priority queuing, which means all packets that

are received are examined to see if they have been priority

encoded. When a packet is received, the Switch will read the

priority level and determine the appropriate channel to forward

the packet based on the priority level. 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.

Switch 2824

3C16479