Power Over Ethernet (Poe); Sfp Ports; Traffic Prioritization - 3Com Baseline 2226-PWR Plus User Manual

8 C 1: I
HAPTER NTRODUCING THE

Power over Ethernet (PoE)

The Switch supports Power over Ethernet (PoE) on all
24 10/100 ports. If you plug in a compatible (IEEE
802.3af compliant) device, the Switch will automati-
cally detect and supply power to it.
By default, PoE is enabled on all 24 ports. You can
also configure the PoE settings for each port from the
Web interface. For more information on configuring
PoE, refer to "Configuring PoE"

SFP Ports

The two SFP ports support fiber Gigabit Ethernet
short-wave (SX) and long-wave (LX) SFP transceivers
in any combination. This offers you the flexibility of
using SFP transceivers to provide connectivity
between the Switch and a 1000 Mbps core network.
When an SFP port is in operation, the corresponding
10/100/1000BASE-T port is disabled.

Traffic Prioritization

The Switch supports two types of traffic prioritization:
Prioritization of IP phone traffic
■
Priority Queuing
■
Prioritization of IP Phone Traffic
The Switch can recognize when an NBX phone is con-
nected 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.
B S
ASELINE WITCH
on page 40.
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 connec-
tion and use the pass-through LAN port on the NBX
phone.
Traffic Priority Queuing
The Switch also offers priority queuing. It examines
each packet that it receives to determine if it is prior-
ity-encoded. If a packet is priority-encoded, the
Switch reads the priority level and determines
whether the packet should be directed through the
normal or high priority channel. This feature is useful,
for example, during periods of excessive network
load, 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 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 prefer-
ence over that traffic. This ensures that time-sensitive
traffic gets the highest level of service.