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The New Frontier of Enterprise Wireless. April 2009. On the 2.4GHz band, only 3 Non Overlapping channels. Frequency Constrains. Radio Basics – Coverage Range. Radio Coverage: - PowerPoint PPT Presentation
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The New Frontier of Enterprise Wireless
April 2009
On the 2.4GHz band, only 3 Non Overlapping channels.
Frequency Constrains
Radio Basics – Coverage <> Range
Distance
Client C
onnects @
54 Mbps
Client C
onnects @
6 Mbps
Client C
onnects @
1 Mbps
Radio Transmission Still Continues
Radio Coverage:
This is the area a client can hear an Access Point and reply successfully – Typically 10 Metres radius from the AP at 54 Mbps
Range:
The RF energy does not stop simply because the client and AP can no longer interpret the data, typical Range may be 2,000 meters
Radio Basics – Why Coverage <> Range
Multipath:When a client hears the same data from a single AP several times, this can corrupt the signal.
Reflection:Flat metallic surfaces tend to reflect RF energy
Refraction:Metal grids can distort the RF energy making it unusable
Absorption:Fluids usually absorb RF energy as in a microwave.
Wi-Fi So Far…
Traffic contention
Unreliable connection
Wi-Fi So Far… Traffic contention
Unreliable connection
Slow or wrong mobility
AP-to-AP interference
Coverage gaps hard to fix
APs individually configured
One AP serves all. QoS hard to be assured
Only one channel per area
Only one channel per area
AP to AP Interference
Up to 21dBm between 54 and 1 Mbps
Up to 21dBm between 54 and 1 Mbps
AP coverage can be more than double at low speed
AP coverage can be more than double at low speed
The Trouble with Cells…802.11 is meant for a Single-Cell Environment
Forces a Single-AP protocol to function in a Multi-AP Environment
Results in trade-offs: a “tug-of-war”
This architecture is impaired by the 802.11 Standard.
Trade-Offs
Coverage vs. Capacity
Capacity vs. Mobility
Mobility vs. Security
Wi-Fi Headaches
High OpEx» Radio Planning is an Expensive and long task
» Filling up network coverage gaps is a hard task often requiring AP repositioning
» Wireless Network Tuning is a continuous task requiring well trained professionals
802.11n with its ability to take advantage of multipath increases the pain
» Planning AP coverage is almost impossible because of unpredictable reflections
» AP coverage changes as people move, because being made mostly of water, humans absorb and diffract radio waves
Wi-Fi Headaches
Low spectrum usage» Cannot fully reuse channels In order to limit interferences
Network Performances depend upon client devices!» AP selection made by client
» The less performing client slows down the network
Lack of real mobility» Roaming decision taken by client
» Roaming Process is critical and not fully reliable as it must be in order to support VoWLAN applications
Weak physical security» AP, even if lightweight, store network critical data: Keys, Credentials,
Access Lists, etc.
» AP can be replaced by fake ones in order to access network and grab credentials
» Hence AP must be physically locked
How Extricom by ATI solves all those issues
A High-Performance Wireless IP Cloud –The Extricom Channel Blanket™
• AP-Anywhere (no need to configure)• Mobility• Guaranteed Bandwidth
The Channel Blanket™
Centralize 802.11 Logic, Distribute the Radio Only
A “single cell experience” gives:Steady Throughput
Any-Density RP PositioningConsistent Client Behavior
A “single cell experience” gives:Steady Throughput
Any-Density RP PositioningConsistent Client Behavior
Client I
ndepen
dent
Client I
ndepen
dent
Multi-Service WLAN Blankets
The Channel Blanket™
Centralize 802.11 Logic, Distribute the Radio Only
Multi-Layer WLAN
Distribute four radios, set to any combination of channel, band & mode
• Capacity• Simplified QoS• Dedicated Security Monitoring
+
1
6
11
Rogue
• AP-Anywhere• Intrinsic Mobility• Guaranteed Bandwidth
Traditional APs cannot use more than 1 channel in
each band
Traditional APs cannot use more than 1 channel in
each band
Multi-Service WLAN Blankets
The Channel Blanket™
Centralize 802.11 Logic, Distribute the Radio Only
Multi-Layer WLAN
Distribute four radios, set to any combination of channel, band & mode
• Capacity• Simplified QoS• Dedicated Security Monitoring
+TrueReuse™
Dynamic frequency reuse
• 3X Channel Bandwidth• Up to 10X System
Aggregate Bandwidth
+
1
6
11
Rogue
• AP-Anywhere• Intrinsic Mobility• Guaranteed Bandwidth
Cell Planning – Hard Work
Roaming = Poor Quality
Disconnect From AP on Channel 11Request to join AP on Channel 6Authenticate with central RadiusConnect and start recovering data
Disconnect From AP on Channel 6Request to join AP on Channel 1Authenticate with central RadiusConnect and start recovering data
Client D
epen
dent!
Client D
epen
dent!
Cell Planning – No Need With Extricom
Even the most basic client gets seamless mobilityClient interacts with a single AP:Same SSID, Same MAC (BSSID)
QoS – Best Effort – All Channels Congested
Traditional Cell Planning
QoS – Guaranteed – All Channel Dedicated
Client I
ndepen
dent
Client I
ndepen
dent
TrueReuse: Multiply Bandwidth with Seamless Mobility
Client I
ndepen
dent
Client I
ndepen
dent
“Natural” Frequency Reuse - download
Multiple use of the same channel, geographically separated
» IEEE 802.11 standard – CSMA/CA – listen before talk
Distance between APs which will be “allowed” by the standard to transmit simultaneously on the same frequency
» more then 100m, dependent on the environment. (office environment, open space, wall types, etc.
Re-usedistance
Re-usedistance
Re-usedistance
Without TrueReuse
WLAN is a shared media, all clients will share the bandwidth available on the channel.
On every channel, only one RP or client will transmit at a time. This is protected by the Collision Avoidance mechanism of the 802.11 standard.
Client I
ndepen
dent
Client I
ndepen
dent
TrueReuse
Channel blanket dynamically “subdivided” into multiple collision domains, to create simultaneous multiple links without co-channel interference
Switch uses real-time knowledge of link differentials between all clients and all RPs to determine the re-use opportunity
TrueReuse – How it works?
The link difference is what matters:» If C1/I1 > Reuse Threshold, then permit transmission to Client 1
» If C2/I2 > Reuse Threshold, then permit transmission to Client 2
The switch uses received signal strength measurements to calculate the above ratio
C1I1
I2
C2
What about physical security
Extricom Radio Points (EXRP) are NOT AP» Are simple radio interfaces
» Do not contain any sensible information at all
» Do not have any flash memory to store any information
» Useless without the switch
Extricom Switches (EXSW) can be secured into locked cabinets or wiring closets
RP-Switch protocol is not Ethernet» It is real time with very tight timing constraints (some ns). Almost
impossible to spoof by a PC
» Even tapping into RP-Switch connection will show only what goes on air
IEEE 802.11NBenefits without Pains
Full .11n performances
Full-performance 802.11n (40MHz) is not possible. There is only 1 channel available
Mixing .11g traffic strongly affects .11n performances
11
1+6 ?
?
??
?
?
1+6
11
Full-performance .11n and .11g .11n and .11g traffic separated
on different channels
Channel Blanket
Cellular Approach
n
g
Captive Portal
Switch controls client’s access to the internet
After client connects to the WLAN, when opening it’s browser he will receive a login WEB page located on the switch
Clients shall enter their user-name/password, and the switch shall authenticate the user with the Radius server (using Radius client protocol)
User can customize default page by modifying text,
images and colors (no html knowledge needed), or upload own html page
Extricom Products
WLAN Switches Radio Points
Management & Planning Accessories
Technology Background: Multi Series 1000 Appliance Platform
High-performance Hardware Platform
Software-configurable
Gigabit Ethernet Uplink ports
Downlink ports: up to 16 GbE with IEEE 802.3af PoE(software-enabled)
Products using this platform:
EXSW-1600
EXSW-800G
Extricom WLAN Switches
EXSW-1600 / EXSW-800G GbE WLAN Switch» Support up to 16 or 8 UltraThin RPs (a/b/g/n)» Up to 4 simultaneous channel blankets» Hardware based 802.11i security» Built-in PoE
EXSW-2400 / EXSW-1200 FE WLAN Switch» Support up to 24 or 12 UltraThin RPs (a/b/g)» Up to 4 simultaneous channel blankets» Hardware based 802.11i security» Built-in PoE
EXSW800 / EXSW400 FE Small WLAN Switch» Support up to 8 or 4 UltraThin RPs (a/b/g)» Up to 2 simultaneous channel blankets» Hardware based 802.11i security» Built-in PoE
Extricom UltraThin™ Radio Points
Extricom UltraThin™ Radio Points» UltraThin - No software or processing needed in the RP
» Multiple 802.11n/a/b/g radios
» 802.3af Power over Ethernet (PoE)
» Anti-breach security and built-in Rogue AP detection
EXRP-20 / EXRP-40
Dual or Quad-Radio, a/b/g, Integrated Antennas
EXRP-20E / EXRP-40E
Dual or Quad-Radio, a/b/g, External Antennas
EXRP-40En
Quad-Radio, n/a/b/g, 3x3 MIMO,External Antennas
EXRP-30n
Tri-Radio, n/a/b/g, 3x3 MIMO, Integrated Antennas
Accessories
EXRE-10 & EXRE-20 PoE Range Extender» Double the range of PoE to 200m» In-line and self-powered» Drains 1.5W only
Allied Telesis Fiber Extenders» Up to 700m of cable between switch and RP» Fully transparent to Switch and RP
» 2 x AT-MC1000» Multimode fibre link» 1 x AT-6101G PoE Injector
100m 100m
ATI Labeling
Equipment Label
Carton Box Label
-50
-50
Allied Telesis Success Story
Kawashima Selkon Textiles Co. Ltd
Extricom Management Options
Internal Management» Web GUI
» Configuration
» Status
» Security
NMS (EXNM-2000)» Fault Management
» Performance
» Configuration
» Bulk operations on multiple Switches
EXNM Main Benefits
Single solution to manage large-scale, multi-device networks
Accelerated system rollouts and easy network updates
Full-featured fault management including notification capabilities
Real-time network health monitoring
Scheduled bulk operations on multiple switches
Integration with other major NMS solutions
Secure, auditable management of users and user groups
… all this, in an intuitive GUI
EXNM Features
Scalability» Auto-discovery of up to 2000 switches associated to thousands of
Radio Points (RPs)
» Group configuration of all discovered switches as if they were a single switch
GUI» Intuitive, Graphic Based
» Monitoring of the whole networkfrom a single screen
Northbound interface» for integration with existing NMS
Geographic Map View
EXNM Features – cont.
System Configuration
Configuration tasks on individual and group of switches (e.g. add same ESSID, reboot, upgrade firmware…)
Drill down to specific devices from High level Geographic map views
Security Management
Secured client/server sessions
Optional interface to LDAP servers for user authentication and management
Privileges based on profiles
Audit trails
Security Configuration
EXNM Features - cont.
Fault ManagementSNMP trapsReal-time statusVisualization of Extricom Network
PerformanceConfigurable statistics pollingGraphical reporting on statistical performance of individual devices or of the
whole system
InteroperabilityConfigurable Northbound interface
for 3rd- party systems (e.g. Tivoli™, etc.)
Ordering Information
Item Number Description
EXNM-2000/2E Max. of 2 Managed Switches 2 Users only
EXNM-2000/5 Maximum of 5 Managed Switches; 4 users
EXNM-2000/10 Maximum of 10 Managed Switches
EXNM-2000/25 Maximum of 25 Managed Switches
EXNM-2000/50 Maximum of 50 Managed Switches
EXNM-2000/100 Maximum of 100 Managed Switches
EXNM-2000/U Maximum of Up to 2000 Managed Switches
High Availability
Higher resilience than “N+1” system integrity
» AP redundancy
» An option to create redundancy only in high availability areas
» Uplink Diversity
» Failover transparency
» Eliminating Single Point of Failure (SPOF)
Competitive pricing over “1+1” component level
» No need to duplicate AP’s
» 2nd switch licensed as cascaded
DHCP
Server
Redundant EXSCMain EXSC
128.128.1.1 128.128.1.1
L2/L3
GRE tunneling
WLAN Switch is connected to a specific subnet
Using EXSC, a client can seamlessly connect to a WLAN Switch located in an other subnet
EXSC-1000: Subnet Roaming Controller
Internet
L2
About Extricom
ex.tri.com — from the English word extricate [Latin root extricare]
1. To free or release from entanglement or impediments.2. To untangle and/or simplify communications.
Extricom Mission Statement
Provide high-performance wireless LAN (WLAN) infrastructure for the Enterprise Market, enabling the converged triple play of data, streaming video, and voice over WLAN (VoWLAN)
About Extricom
Vitals» Principal offices in New York, Tel-Aviv, London, Tokyo
» Founded 2002
» Patented: 18 filed, 9 granted
» CTO is one of original members of IEEE 802.11 group
The Proposition» Superior performance and dramatic simplicity
» Multi-use infrastructure – voice, data, location, video, guest services
Product Recognition
TechWorld Wireless Product of the Year – Finalist (2008)
Communications Solutions Wireless Product of the Year (2007)
CMP CRNTech Top 10 Products of the Year (2007)
VARBusiness Tech Innovator of the Year (2007)» The most innovative products in the industry sold through the
IT Channel – Wireless Category
Communications Solutions Wireless Product of the Year (2006)
TechWorld Wireless Product of the Year (2006)» Awarded for Enterprise functionality, performance, and value
Internet Telephony Wireless Product of the Year (2006)» Awarded for innovation for VoIP over wireless
This is just the beginning!Thank you!
Visit us on www.alliedtelesis.com