© 2005 Extreme Networks, Inc. All rights reser ved. Summit WM Series WLAN Switches—Page 3
Extreme Networks Data Sheet
Voice-Grade Performance
High-Speed Cross Subnet
Roaming
Summit WM series switches offer
scalable, voice-grade performance,
meaning that VoWLAN users can roam
from AP to AP—even across subnets—
without experiencing annoying echoes or
dropped connections. When roaming,
client IP addresses do not change as
users move and applications are not
affected. These capabilities are easy to
add to existing networks without
configuration changes, topology modifica-
tions, or client software.
Summit WM series switches are capable
of taking advantage of new roaming
enhancements based on the 802.11i
standard. With pre-authentication and
key caching, users can quickly move
between APs even when authenticating to
centralized network RADIUS resources.
Security is not compromised with the
high-speed roaming—the Summit WM
series switches generate a unique key only for
the APs to which the client is likely to roam.
End-to-end Mobile Quality of
Service
QoS is critical, especially for VoWLAN or
high-priority users. The Summit WM
switches’ architecture offers end-to-end
QoS from the wireless client to the packet
destination. In addition, QoS is easy to
configure for different classes of users
through the WM-ADs.
Extreme Networks’ wireless QoS solution
maintains the correct traffic priority from
client to destination. Over the air, latency-
sensitive traffic is given priority transmit
access using either the SpectraLink Voice
Protocol (SVP) or 802.11e Wireless
Multimedia Extension (WME) priority
management. Then before the APs tunnels
latency-sensitive traffic to the switch, it
adds a high-priority Type of Service (ToS)
field to the tunneled packet. Finally, the
Summit WM switch maintains the ToS field
setting when the traffic is delivered to the
enterprise LAN so that the traffic priority
is maintained at every step of the way.
Mission-Critical High
Availability
All aspects of the Summit wireless mobility
solution provide enterprise-grade high
availability. At the radio level, AutoCell will
detect AP failures and boost the power
output of the neighboring APs to compen-
sate for the gap in coverage. This elimi-
nates middle of the night support calls
when an AP fails.
To enhance switch availability, the
Summit WM switch ships with redundant
power supplies, eliminating concerns
about power supply failure. In addition,
the switch can be configured in redundant
mode with a second Summit WM switch.
Should either switch fail, APs on that
switch would detect the failure network
link fail, the Summit WM switch can select
a new network route, often over a different
physical interface, using Open Shortest
Path First (OSPF).
Today’s enterprise wireless LANs must perform the same tasks with the same expectations for performance and quality, as
their wired counterparts. Summit WM series switches deliver outstanding performance for advanced, latency-sensitive applica-
tions such as voice over WLAN.
Dynamic RF Management Using AutoCell
Altitude 350-2
NetworkNetwork
Altitude 350-2
Summit WM1000
Summit WM1000
Three Levels of High Availability
(22 paginas)
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