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The numbers in this diagram refer to numbered sections in the
text.
Front Panel
1 8 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: 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.
The Baseline 8 Port Gigabit Switch has 8 10/100/1000 Mbps
auto-negotiating ports. Each port automatically determines the
correct 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 duplex
CAUTION: The Baseline 8 Port Gigabit Switch supports
full duplex auto-negotiation. If the connected device
does not support auto-negotiation, the Switch will
operate in half duplex mode (only for 10BASE-T and
100BASE-TX). 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 and can be used
to connect to either another switch port, server, or workstation
without additional configuration. Each port can be connected to
a device with a normal ‘straight through’ TP (twisted pair) cable
or a ‘cross-over’ TP cable.
Priority Queuing
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.
F
EATURES
OF
THE
B
ASELINE
8 P
ORT
G
IGABIT
S
WITCH
3
5
4
1
14
5
8
2
!
2