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DXS-3326GSR Gigabit Layer 3 Switch
Switching Technology
Another key development pushing the limits of Ethernet technology is in the field of switching technology. A switch
bridges Ethernet packets at the MAC address level of the Ethernet protocol transmitting among connected Ethernet or Fast
Ethernet LAN segments.
Switching is a cost-effective way of increasing the total network capacity available to users on a local area network. A
switch increases capacity and decreases network loading by making it possible for a local area network to be divided into
different segments, which are not competing with each other for network transmission capacity, and therefore decreasing
the load on each segment.
The Switch acts as a high-speed selective bridge between the individual segments. Traffic that needs to go from one
segment to another (from one port to another) is automatically forwarded by the Switch, without interfering with any other
segments (ports). This allows the total network capacity to be multiplied, while still maintaining the same network cabling
and adapter cards.
For Fast Ethernet or Gigabit Ethernet networks, a switch is an effective way of eliminating problems of chaining hubs
beyond the "two-repeater limit." A switch can be used to split parts of the network into different collision domains, for
example, making it possible to expand your Fast Ethernet network beyond the 205-meter network diameter limit for
100BASE-TX networks. Switches supporting both traditional 10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal
for bridging between existing 10Mbps networks and new 100Mbps networks.
Switching LAN technology is a marked improvement over the previous generation of network bridges, which were
characterized by higher latencies. Routers have also been used to segment local area networks, but the cost of a router and
the setup and maintenance required make routers relatively impractical. Today's switches are an ideal solution to most
kinds of local area network congestion problems.
Switch Description
The DXS-3326GSR is a manageable Gigabit stackable switch designed to uplink network backbones, servers,
workstations, and internetwork systems. The DXS-3326GSR is equipped with 24 SFP (Small Form Factor Portable) ports,
which are to be used with fibre optical transceiver cabling in order to uplink various other networking devices for a gigabit
link that may span great distances. These 24 SFP ports support full-duplex transmissions, have auto-negotiation and can be
used with DEM-310GT (1000BASE-LX), DEM-311GT (1000BASE-SX), DEM-314GT (1000BASE-LH) and
DEM-315GT (1000BASE-ZX) transceivers.
In addition, the Switch has four 1000BASE-T combo ports that may be used in uplinking various network devices to the
Switch, including PCs, hubs and other switches to provide a gigabit Ethernet uplink in full-duplex mode. These four ports
are referred to as “combo” ports which means that both the SFP ports and the 1000BASE-T ports are numbered the same
(21-24) and cannot be used simultaneously.
Also included at the rear of the Switch are two 10-gigabit stacking ports used to stack up to eight other switches. The
DXS-3326GSR may be used as a slave or master unit of a switch stack when utilizing these two ports and can be
configured in a Star or Ring topology, and in total, may provide a stacking solution of up to 288 gigabit ports. More
information will be provided later in this manual concerning stacking and the DXS-3326GSR.
This Switch may also be equipped with an optional 2-port 10-gigabit XFP module utilizing the module slot at the rear of
the Switch. This optional module can provide a 10-gigabit fiber-optic networking solution for network administrators and
is operational in full duplex only. This optional module is only compliant with XPF MSA transceivers.
NOTE: The four 1000BASE-T combo ports on the Switch, numbered 21-
24 cannot be used simultaneously with the corresponding SFP ports,
numbered 21-24. If both ports are in use at the same time (ex. port 21 of
the SFP and port 21 of the 1000BASE-T), the SFP ports will take priority
over the combo ports and render the 1000BASE-T ports inoperable.
Features
IEEE 802.3z compliant
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IEEE 802.3x Flow Control in full-duplex compliant
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