3Com 3C16470-US Manuel de l'utilisateur - Page 2

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Numbered elements in this diagram refer to numbered sections in

the text. A 24-port unit is shown.

Front Panel

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.

SE THE

10/100 S

ASELINE

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.

The traffic prioritization feature supported by the Switch

is compatible with the relevant sections of the IEEE

802.1D standard (incorporating IEEE 802.1p).

f 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.

WITCH

Priority Level

Traffic Type

Best Effort

Background

Standard (spare)

Excellent Effort (business critical)

Controlled Load (streaming multimedia)

Video (Interactive media), less than 100

millisecondsn latency and jitter.

Voice (Interactive voice), less than 10

milliseconds latency and jitter.

Network Control Reserved traffic