3Com Baseline 3C16490 Manuale di avvio rapido - Pagina 2
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P
HYSICAL
5
9
The numbers in this diagram refer to numbered sections in the
text.
Front Panel
1 24 RJ-45 10/100 Ports
WARNING: 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 RJ-45 data connectors, network
telephony systems, or network telephones should be
connected to these sockets. Either shielded or unshielded
data cables with shielded or unshielded jacks can be
connected to these data sockets.
AVERTISSEMENT: 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 données.
WARNHINWEIS: 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 10/100 Mbps auto-negotiating ports. Each
port supports automatic MDI/MDI-X detection and can be
connected to either a 10BASE-T or a 100BASE-TX device.
Ports 1 to 24 are auto-negotiating; their speed and duplex mode
(half-duplex or full-duplex) are automatically determined by the
capabilities of the connected device.
You can also use ports 1 to 24 to deliver Power over Ethernet.
The Switch can automatically detect PoE devices connected to
these ports, and, if sufficient power is available (see the Power
Management Section), supply power to these devices. To see if
power is being supplied to the connected device, check the
F
EATURES
1
2
8
relevant PoE LED. For PoE troubleshooting, refer to
"Troubleshooting" on page 7.
2 10/100/1000BASE-T/SFP Ports
Ports 25 and 26 are combination Gigabit RJ-45 ports with shared
SFP (Small Form Factor Pluggable) transceiver slots. If an SFP
transceiver (purchased separately) is installed in a slot and is
active, the associated RJ-45 port is disabled.
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X
operation, so you can use either straight-through or crossover
cables for all network connections to workstations or servers, or
to other switches or hubs.
Ports 25 and 26 are not configured to provide Power over
Ethernet.
The two SFP ports support fiber Gigabit Ethernet shortwave (SX)
and longwave (LX) SFP transceivers in any combination. This offers
you the flexibility of using SFP transceivers to provide connectivity
between the Switch and remote 1000 Mbps workgroups or to
create a high capacity aggregated link backbone connection.
SFP ports are numbered 25-26 on the Switch. When an
SFP port is active, it has priority over the 10/100/1000
port of the same number. The corresponding
10/100/1000 port is disabled when an SFP port is active.
Traffic Prioritization
Support for NBX phone system
The Switch can recognize when an NBX phone is connected to
any of the ports 1 to 24. The Switch will automatically detect the
NBX phone when the phone starts up, and will ensure that traffic
to and from the phone is given the highest priority.
To ensure that the NBX phone is recognized by the
Switch during its initialization, do not connect any data
source through the phone until the phone has finished its
startup sequence. Once the phone is available for use,
any data source (for example, a computer) can then be
connected to the phone's pass-through port. This only
applies if you use a single wall jack for your network
connection and use the pass-through LAN port on the
NBX phone.
The Switch also offers priority queuing. It examines each packet
that it receives to determine if it is priority-encoded. If a packet is
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