3com SuperStack® II Dual Speed Hub 500 24-Port 3C16611-ME Scheda Tecnica

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SuperStack II Hubs 
Easy to Use
The SuperStack II Dual Speed Hub 500
and PS Hub family offer plug-and-play
connectivity for the easiest-to-use,
stackable hub system. The self-config-
uring hubs ensure reliable, troublefree
installation from the moment your
system is turned on.
Scalability
The SuperStack II Hub 10, PS Hub
family, and Dual Speed Hub 500 all
stack together, allowing for easy expan-
sion of your network—so you can build
and expand 10 Mbps stacks (PS Hubs)
and expand to add 10/100 Mbps users
(Dual Speed Hub 500) when the time 
is right. 
Advanced RMON Management
Embedded RMON software and
dedicated hardware provides support
for at least seven RMON groups on all
segments. RMON enterprise
monitoring and analysis lets network
managers work smarter—not harder—
in managing their network devices
networkwide. Transcend
®
network
management’s powerful combination of
RMON and SmartAgent
®
software
reduces the processing burden on the
management station, minimizing
network traffic and saving time by
automatically monitoring and analyzing
the network. RMON indicates at a
glance how the network is performing
and who is using it the most. 
Web Management
Web-based management allows easy
graphical configuration and direct
access to management information
from anywhere on the network with a
few clicks of the Web browser.
LAN Security Architecture (LSA)
3Com’s patented LSA comes standard
with the hub’s management to deliver
advanced security features to protect
your valuable network resources. For
example, Need To Know (NTK) pro-
tects sensitive data on the network by
preventing passive listening to 
sensitive information, and Disconnect
Unauthorized Device (DUD) auto-
matically detects and/or disables unau-
thorized devices and then notifies the
network management station.
Outstanding Fault Tolerance
The Dual Speed Hub 500 and PS Hub
family allow single points of failure to
be backed up to minimize downtime. 
Redundant management Management
can continue uninterrupted even if one
unit in the stack goes offline. The
SuperStack II Dual Speed Hub 500 can
accept multiple management modules
for redundancy. This capability is stan-
dard with PS Hubs because each hub
already has built-in management.
Redundant bridges If there are mul-
tiple Dual Speed Hub 500s or PS Hub
50s in a stack, the internal bridges will
configure themselves to be redundant to
each other. 
Hot-swap cascade units Allows units
to be added and removed from the
middle of a stack without interruption,
similar to adding or removing a card
from a chassis. 
Resilient links Provides backup con-
nections for downlinks, protecting
against cable breakage and unit failure.
Resilient links switch so quickly that
users are never aware. 
Backup power systems The Advanced
Redundant Power System protects
against internal power supply unit
failure, and the Uninterruptible Power
System protects against AC main
failure.
Transcend Network Management
All SuperStack II products include
3Com Transcend Network Supervisor,
providing powerful, yet easy-to-use net-
work management tuned to the needs
of small-to-medium enterprises. Less
experienced network managers will find
the automated operations and intelli-
gent defaults helpful, while more
experienced users will enjoy using the
advanced features. An intuitive user
interface focuses on the tasks and infor-
mation all managers need to take
control of their network. A discovery
wizard finds IP devices and links on the
network up to a maximum of 500
devices. After discovery, the network
structure is automatically mapped to
provide a graphical display of devices
and connections. Working from the
map, the network manager can quickly
monitor stress, set thresholds and alerts,
view network events, generate reports,
and launch device configuration tools.
To provide fast notification of prob-
lems, Transcend Network Supervisor
alerts announce network problems via
audio/visual alarms or e-mail.
Transcend Network Supervisor provides:
Immediate notification of
problems
—An alert system quickly
notifies managers of problems.
Total visibility—A network activity log
lists network events as they occur.
Knowledge of the network—A net-
work map shows the devices and
physical connections of the network
and provides an instant color-coded
view of the state of the network.
Real-time detailed monitoring
Good monitoring is a combination of
examining available bandwidth, gener-
ated errors, service availability, and
application response times. The
Network Supervisor stress window pro-
vides an accurate indication of the
current state of stress and a warning
zone that helps predict when a device or
link may be about to become over-
loaded.
Other products in the award-winning
3Com Transcend family, such as
Transcend WorkGroup Manager and
Transcend Enterprise Manager, can also
manage the SuperStack II series.
Expansion Flexibility 
The Dual Speed Hub 500 and PS Hubs
provide expansion slots in every hub.
These can be used for Fast Ethernet TX
and FX downlinks in the Dual Speed
Hub 500 and PS Hub 50, or adding a
management module to the Dual Speed
Hub 500, or even connecting to a dif-
ferent media such as 10BASE2. See the
Specifications section for full details on
the wide range of expansion modules
available. 
3Com +5 Lifetime Limited
Warranty
The 3Com +5 lifetime limited warranty
minimizes downtime and ensures that
the network is back up fast. Should a
hub fail during its first five years, 3Com
will provide a replacement unit. You
then return the faulty unit to 3Com for
repair. After five years, 3Com’s standard
lifetime limited warranty applies.