3Com 3C16470-US Руководство пользователя - Страница 2
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H
OW TO
1
13
6
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
1
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.
U
B
SE THE
1
4
5
8
9
16
17
20
21
10/100 S
ASELINE
12
24
3
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.
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,
I
the link between them operates at 100 Mbps full duplex.
You must use Category 5 cable when connecting the
units.
2
WITCH
4
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
5