Allied Telesis Extricom AT-EXMS-1000 User manual

613-002120 Rev. A
Extricom Series
WLAN System
AT-EXMS-1000
AT-EXLV-2000
AT-EXLS-3000
AT- E X M S - 5 0 0
AT-EXRP-22n/32n/22En/32EOn
Installation and User Guide

Copyright
No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any
form or by any means, photocopying, recording or otherwise, without prior written consent of
Allied Telesis, Inc. No patent liability is assumed with respect to the use of the information
contained herein.
While every precaution has been taken in the preparation of this publication, Allied Telesis, Inc.
assumes no responsibility for errors or omissions. The information contained in this publication and
features described herein are subject to change without notice. Allied Telesis, Inc. reserves the right
at any time and without notice, to make changes in the product.
Copyright © 2015 Allied Telesis, Inc. All rights reserved. The products described herein are
protected by U.S. Patents and may be protected by other foreign patents, or pending applications.

Important Notice:
Read this guide, safety instructions, and the release notes for your switch firmware,
before installing and operating the Extricom Series WLAN system.
Disclaimer
Allied Telesis makes no representations or warranties whether expressed or implied, that the
Extricom Series wireless local area network (WLAN) system or any component thereof shall
meet the purchaser’s operating requirements or that system operation will be uninterrupted
or error-free. All WLANs, including the Extricom Series WLAN system, can potentially be
affected by outside sources of interference such as other broadcasting devices, radiation,
device immunity level, and other external sources of interference.

Extricom Series WLAN System Installation and User Guide i
!
This equipment has been approved for mobile applications where the equipment is
to be used at distances greater than 20cm from the human body (with the exception
of hands, wrists, feet and ankles). Operation at distances of less than 20 cm is
strictly prohibited.
Changes or modification to equipment not expressly approved by Allied Telesis,
Inc. is strictly prohibited and could void the user's license to operate the
equipment.

AT-EXRP-22n/32n/22En access points are for indoor use only.
The maximum antenna gain is 4dBi
An Extricom Series access point includes multiple WLAN radio modules; each
radio module is configured separately and serves a different set of clients.
There is no relation between transmissions on different radio modules, hence
in a single AP:
oRadio modules cannot transmit simultaneously over the same radio
channel.
oA client device may transmit and receive data through one radio
module.
!
Please check the release notes for your version of Extricom Series firmware before
installing or operating the system. The relevant release notes supersede this user
guide.
The availability of some specific channels and/or operational frequency bands is country-dependent,
and the firmware is programmed at the factory to match the intended destination. This firmware
setting is not accessible by the end user.

ii Disclaimer
Federal Communication Commission and Industry Canada Interference Statement
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC and IC rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one of the
following measures:
Reorient or relocate the receiving antenna
Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected
Consult the dealer or an experienced radio/TV technician for help
FCC Caution: Any changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate this equipment.
This device complies with Part 15 of the FCC & IC Rules. Operation is subject to the following two
conditions:
1) This device may not cause harmful interference
2) This device must accept any interference received, including interference that may cause
undesired operation.
Important Note:
FCC and IC Radiation Exposure Statement
This equipment complies with FCC and IC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with a minimum distance of 20 cm
between the radiator and your body.
This transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.
Operations in the 5.15-5.25 GHz band are restricted to indoor usage only, to reduce potential for
harmful interference to co-channel satellite systems.
The maximum antenna gain permitted (for devices in the 5725-5825 MHz band) must comply with
the EIRP limits specified for point-to-point and non point-to-point operation as appropriate, as
stated in section A9.2(3).
Sec. A9.2 (3): For the band 5725-5825 MHz, the maximum conducted output power shall not
exceed 1.0 W or 17 + 10 log10 B, dBm, whichever power is less. The power spectral density shall
not exceed 17 dBm in any 1.0 MHz band. The maximum EIRP shall not exceed 4.0 W or 23 + 10
log10 B, dBm, whichever power is less. B is the 99% emission bandwidth in MHz
Fixed point-to-point devices for this band are permitted up to 200 W EIRP by employing higher
gain antennas, but not higher transmitter output powers. Point-to-multipoint systems, Omni-

Extricom Series WLAN System Installation and User Guide iii
directional applications and multiple co-located transmitters transmitting the same information are
prohibited under this high EIRP category. However, remote stations of point-to-multipoint systems
shall be permitted to operate at the point-to-point EIRP limit provided that the higher EIRP is
achieved by employing higher gain directional antennas and not higher transmitter output powers.

iv Table of Contents
Table of Contents
About This Guide..................................................................................................1
Audience..........................................................................................................................1
Conventions.....................................................................................................................1
Safety Precautions...........................................................................................................1
Chapter 1 Introduction to the Extricom Series Wireless LAN System .............................3
Overview of the Extricom Series WLAN System...........................................................3
Feature Highlights...........................................................................................................5
Overview of the Switch Platforms ..................................................................................8
Overview of the Extricom Series Access Points...........................................................11
Access Points with Internal Integrated Antennas .......................................................11
Access Points with Connectors for External Antennas...............................................11
Outdoor Access Points with Connectors for External Antennas ................................12
A Typical Extricom Series Wireless Network Topology..............................................13
Switch Cascade...........................................................................................................15
AT-EXLS-3000 ..........................................................................................................18
Chapter 2 Installing the Extricom Series WLAN System.................................................19
Unpacking the Extricom Series WLAN System...........................................................19
Switches......................................................................................................................19
Access Points..............................................................................................................19
AT-EXRE-1000 Range Extender ...............................................................................20
AT-EXMC-1000 Media Converter.............................................................................20
Additional Equipment ...................................................................................................20
Cables for Connecting Two Switches in Switch Cascade ..........................................20
Cable for Connecting the AT-EXLS-3000 to AT-EXLS-1000s.................................20
Determining the Location of the Extricom Series Access Points..................................21
Extricom Series Switches..............................................................................................21
AT-EXRP-22n/32n/22En/32EOn Access Points...........................................................24
Access Point Connectors and LEDs..............................................................................25
Mounting the Switches (Optional) ................................................................................26
Mounting the Access Points (Optional) ........................................................................26
Connecting the Switch and the Access Points...............................................................27

Extricom Series WLAN System Installation and User Guide v
Connecting the AT-EXLS-3000 Switch........................................................................29
Range Extenders and Media Converters .......................................................................32
EXRE-1000 Range Extender......................................................................................32
EXMC-1000 Media Converter ...................................................................................32
Chapter 3 Configuring the Extricom Series WLAN System............................................33
Accessing the Extricom Series Switch GUI..................................................................33
Using the Extricom Series Web Configuration Pages...................................................34
Overview of the Configuration......................................................................................36
Configuring LAN Parameters........................................................................................38
Configuring WLAN Settings.........................................................................................40
Configuring ESSID Definition ...................................................................................40
Configuring WLAN Radios........................................................................................54
ESSID Assignment .....................................................................................................61
Access Points.................................................................................................................62
System Tools Configuration..........................................................................................65
Apply ..........................................................................................................................65
Reboot.........................................................................................................................65
Maintenance................................................................................................................66
Time & Date ...............................................................................................................68
Passwords....................................................................................................................69
Upgrade.......................................................................................................................70
Certificate....................................................................................................................71
Application..................................................................................................................71
License........................................................................................................................72
Advanced Configuration ...............................................................................................73
Cascade Resiliency.....................................................................................................73
Rogue..........................................................................................................................75
System Logging..........................................................................................................76
SNMP .........................................................................................................................78
IDS..............................................................................................................................80
Portal (Captive Portal) ................................................................................................82
Multicast .....................................................................................................................84
LBS.............................................................................................................................85
Expert..........................................................................................................................85
Others..........................................................................................................................85
Viewing Events and Reports.........................................................................................87
Chapter 4 Configuring the AT-EXLS-3000 System..........................................................93
Powering Edge Switches...............................................................................................93
Advanced Configuration –AT-EXLS-3000 Differences..............................................94
Redundancy ................................................................................................................94

vi Table of Contents
Chapter 5 Configuring the AT-EXLV-2000 System .........................................................97
Advanced Configuration –AT-EXLV-2000 Differences.............................................97
Enabling Large Public Venue.....................................................................................97
Configuring Honeypot................................................................................................97
Configuring Access Point Parameters ........................................................................99
Switch Load Balancing.............................................................................................100
Chapter 6 Troubleshooting................................................................................................102
Chapter 7 Northbound SNMP Traps................................................................................104
Appendix A Internal Access Point Mounting Template.................................................... 111
Appendix B Certifications.................................................................................................... 112

Extricom Series WLAN System Installation and User Guide 1
About This Guide
This guide provides detailed instructions for installing, configuring, and troubleshooting the AT-
EXMS-500/1000, AT-EXLV-2000 and AT-EXLS-3000 WLAN switches, AT-EXRP-22n/32n and
22En/32EOn UltraThin™ Access Points (APs), AT-EXRE1000 range extender, and AT-
EXMC1000 media converter.
Audience
This guide is intended for enterprise IT managers and system installers who are familiar with
installing and configuring networks.
Conventions

A note emphasizes important information for users.
-
A caution warns of possible damage to the equipment if a procedure is not followed
correctly.
!
A warning alerts the user of important operating instructions.
Safety Precautions
Follow the instructions in the guide to ensure proper installation and operation of the switch and
APs.
!
The use of wireless devices is subject to the constraints imposed by local laws.
Operate the switch and APs (apart from AT-EXRP-32EOn) in an indoor environment.
Disconnect the switch and APs from power sources before servicing.
The switch and AP enclosure must not be opened by anyone other than an authorized service
representative.
To comply with FCC RF exposure compliance requirements, maintain a minimal separation
distance of at least 20 cm (8 inches) between the AP and all persons.
The power cable included should not be used with any other electrical equipment other than
Extricom Series switches.
The switch contains an internal battery.

2 About This Guide
!
CAUTION - Always replace the battery with the same type to avoid the risk of
explosion.
Dispose of a used battery according to the instructions provided with the new battery.

Extricom Series WLAN System Installation and User Guide 3
Chapter 1
Introduction to the Extricom Series
Wireless LAN System
A Wireless Local Area Network (WLAN) based on the IEEE 802.11 standard enables laptops,
PDAs, phones, and other Wi-Fi equipped devices to wirelessly connect to the enterprise network.
However, large-scale deployments of traditional cell-based WLANs, in which each access point
(AP) operates on a different channel than that of adjacent APs, have been hindered by issues such as
poor coverage, low capacity, high-latency mobility, and expensive interference analysis or site
survey and maintenance costs.
The Extricom Series WLAN, on the other hand, takes a different solution approach, by avoiding the
coverage and capacity trade-offs of traditional cell-based WLAN architecture. In addition, the need
for cell planning and interference analysis, a highly expensive aspect of owning a WLAN, is also
eliminated. Finally, the Extricom Series WLAN approach eliminates most WLAN maintenance
tasks. The Extricom Series WLAN System is specifically designed to provide increased network
capacity, seamless mobility, high level of security, and easy installation and configuration.
Overview of the Extricom Series WLAN System
The Extricom Series WLAN consists of a wireless switch (AT-EXMS500 / AT-EXMS1000 / AT-
EXLV-2000 and sometimes, also the AT-EXLS-3000) connected to a set of UltraThin™ APs (AT-
EXRP-22n, AT-EXRP-32n, AT-EXRP-32EOn and AT-EXRP-22En). The Extricom Series WLAN
system eliminates the concept of cell planning and replaces it with the “Channel Blanket” topology.
In this topology, each Wi-Fi radio channel is used on every access point to create continuous
“blankets” of coverage. By using multi-radio APs, the Extricom Series system is able to create
multiple overlapping Channel Blankets from the same physical set of devices, as illustrated in
Figure 1.

4 Introduction to the Extricom Series Wireless LAN System
Figure 1: Three-Channel Blanket Coverage
The Extricom Series solution is based on a fully centralized WLAN architecture, in which the
switch makes all the decisions for packet delivery on the wireless network. In this configuration, the
access points (APs) simply function as radios, with no software, storage capability, or IP addresses.
Even the basics of connecting are different: clients associate directly with the switch, not with the
APs. The APs act as RF conduits to rapidly funnel traffic between the clients and the switch. The
Extricom Series architecture has essentially centralized the 802.11 logic in the switch, while
distributing the wireless electronics in the APs.
Centralization of the Wi-Fi environment enables enterprises to deploy 802.11a/b/g/n channels at
every AP, creating multiple overlapping Channel Blankets that leverage each of the radios in the
multi-radio UltraThin AP. Each channel’s bandwidth is delivered across the blanket’s service area
(that is, the combined coverage of all APs connected to the switch), with interference-free operation
and consistent capacity throughout.
As the client moves through the coverage blanket, different APs take over the communication with
it, depending on which AP is in the best position to serve the client at the time. The switch always
uses the optimal uplink and downlink path. While this goes on “behind the scenes,” the client never
detects an AP-to-AP handoff (that is, de-association and re-association), thus experiencing seamless
mobility.
Within each Channel Blanket, the switch avoids co-channel interference by permitting multiple APs
to simultaneously transmit on the same channel only if they will not interfere with each other. This
is the essence of the TrueReuse™functionality.
The Extricom Series supports the 802.11n standard, which builds upon existing 802.11 standards.
802.11n can be used in both the 5 GHz and 2.4 GHz frequency bands, introduces enhancements to
the MAC and the PHY layer, and makes use of multiple-input multiple-output (MIMO) technology.
MIMO is a technology that employs multiple transmitter and receiver antennas to support

Extricom Series WLAN System Installation and User Guide 5
simultaneous data streams. Such technology is capable of increasing data throughput via
enhancements such as spatial multiplexing (data streams), 40MHz channel bonding, Block
Acknowledgment and frame aggregation, and use of spatial diversity to increase range.
Feature Highlights
The Extricom Series WLAN system solution offers the following features:
Ease of deployment - no cell planning
The Extricom Series architecture requires no cell planning and experiences no constraints due to
RF interference or channelization. Consequently, Extricom Series APs can be deployed wherever
needed, in any density or even varying density, to meet the end-client’s desired level of service
(stipulated in terms of connection rate). The traditional site survey is therefore reduced to simple
examination of the space in order to plan the location of the physical equipment.
Multi-Layer WLAN
Using multiple radio Access Points (APs), a single set of APs enables deployment of multiple
high-data-rate Channel Blankets with overlapping coverage, resulting in multiplied aggregate
capacity. Separate Channel Blankets also offer the unique ability to guarantee Quality of Service
by physically segregating different types of traffic (based on service class, user type, and
administrative privileges) onto different channels.
Same-band operation
The Extricom Series WLAN system enables WLAN channels, in the same band (for example,
Channel 1, 6, and 11 in 2.4 GHz), to be simultaneously used within the same AP, to form
overlapping Channel Blankets using the same physical set of APs.
TrueReuse bandwidth
TrueReuse technology multiplies the bandwidth of a standard 802.11 channel by dynamically
optimizing the reuse of each frequency. Within a Channel Blanket, up to three APs are permitted
to simultaneously transmit on the same channel, when the TrueReuse algorithm determines that
they can do this without causing each other co-channel interference.
Zero-latency mobility
In an Extricom Series WLAN, a wireless device remains on the same channel everywhere within
the Channel Blanket. Inter-AP handoffs delays or packet loss do not occur as the client moves
across the range of different APs.
Wi-Fi Collaboration
The Extricom Series patented Wi-Fi Collaboration technology, in which all APs are able to
receive on the same channel, provides uplink path diversity for client transmissions, making the
system highly resistant to RF instabilities and outside interference.
Dense AP deployment
In an Extricom Series WLAN, APs can be deployed in any density convenient to the enterprise, to
achieve both blanket coverage and a guaranteed communications rate to all users. In fact, while
cell-based solutions shy away from dense deployments because of their inherent RF obstacles, the
Extricom Series system performance actually increases with AP density.
Wire-line quality VoWLAN
The Extricom Series Interference-Free architecture is perfectly suited for VoWLAN providing
zero-latency mobility, voice and data separation, reduced power consumption, and high RF
resiliency, all together resulting in superior voice performance.

6 Introduction to the Extricom Series Wireless LAN System
Frame aggregation
With MAC-layer aggregation, a station with a number of frames to send can combine them into an
aggregate frame (MAC MPDU). The resulting frame contains fewer headers in the overhead than
would be the case without aggregating, and because fewer, larger frames are sent, the contention
time on the wireless medium is reduced.
Block acknowledgment
Block acknowledgment works in conjunction with frame aggregation, allowing the transmitter to
request a block acknowledgment for a multiple frame, thus improving overall performance.
Operating modes
Extricom Series products support Legacy, Mixed, and HT Only modes. HT stands for high
throughput. HT Only is a mode in which a specific Channel Blanket can be configured so that
only 802.11n clients (working in mixed mode) can associate with it. This enables support of co-
existence of ‘n’ and ‘b/g’ clients, from the same set of APs, but separated on different channels, so
there is no mixed-mode throughput degradation.
Channel bonding
All earlier versions of 802.11 have used 20 MHz wide channels, defined in the 2.4 GHz and 5
GHz bands. 802.11n- Draft 2.0 specifies operation in the same 20 MHz channels used by
802.11b/g in the 2.4 GHz and 802.11a in the 5 GHz bands, but adds a mode in which a full 40
MHz wide channel can be used. This offers approximately twice the throughput of a 20 MHz
channel. Extricom Series products support 20 and 40 MHz channels both in 2.4 GHz and 5 GHz.
IEEE 802.11i support
Extricom Series products support WEP-64, WEP-128, WPA-TKIP, WPA2-AES (CCMP)
encryption. The authentication modes supported include: RADIUS (802.1x) and WPA Pre-Shared
Key (PSK).
Power save
Full power-conservation management is enabled for associated mobile devices over unicast,
multicast, and broadcast frames. This is based on various IEEE 802.11 standard power-save
specifications such as PS-Poll and U-APSD for 802.11a/b/g devices, and SM & U-PSMP power
save for 802.11n devices.
System redundancy
The Extricom Series system enables full redundancy by connecting two switches in a cascade or
hot-standby topology. The switchover parameters are user-configurable.
Dynamic VLAN (Subnet roaming)
Dynamic VLAN enables VLAN and subnet assignments, access-control lists, authentications,
QoS levels, and other policies to remain with users over the wired-to-wireless transition,
regardless of where the user roams in the network. A tunnel is created for a user that roams to a
different VLAN while currently communicating with the original VLAN to enable uninterrupted
communication.
Inter-switch handoff/Fast roaming
The Extricom Series enables mobile voice clients to roam seamlessly by supporting fast handoffs
between multiple APs and switches in the network. This enables the client to roam back to a
previously authenticated AP with no delay.
Multiple RADIUS servers & RADIUS server redundancy
The Extricom Series system supports multiple RADIUS servers per Extended Service Set
Identifier (ESSID), enabling the user to set redundancy between these RADIUS servers. RADIUS
is a common authentication protocol utilized under the 802.1x security standard (often used in
wireless networks). It improves the WEP encryption key standard, when used in conjunction with

Extricom Series WLAN System Installation and User Guide 7
other security methods such as EAP-PEAP. In an enterprise environment, several RADIUS
servers may be used for backup and also for serving different geographical locations. Up to four
different RADIUS servers can be defined for each ESSID. RADIUS redundancy is based on the
assumption that the user database is identical in all RADIUS servers and that users are listed in all
servers with the same credentials. Switchover from one RADIUS server to another takes place
after consecutive failures of the server. The order of priority is 1 to 4.
Network Time Protocol (NTP)
The Extricom Series system supports synchronization of the system clock over the network,
thereby ensuring accurate local time-keeping with reference to radio and atomic clocks located on
the Intranet and/or Internet.
Fast Handoff (Opportunistic Key Caching) - WLAN clients roaming between APs of the same
Channel Blanket within a single switch’s coverage area experience zero-latency mobility. Clients
roaming between different Extricom Series WLAN switches use the standard 802.11 handoff
mechanism, which is further facilitated by the opportunistic key caching mechanism in the
802.11i standard. In addition to this, the Extricom Series system speeds up 802.11i handoff
between Extricom Series switches by use of Extricom’s inter-switch protocol. This permits the
client to avoid repetitive 802.1x authentications, thereby enabling faster transition between access
points connected to different switches, with minimal session interruption.
Real-time location services –Based on AeroScout or Ekahau technology, Real-Time Location
Services (RTLS) technology provides the ability to locate and position mobile wireless network
devices (or any user equipment specifically equipped with an AeroScout or Ekahau active RFID
tag device) within the Extricom Series wireless network infrastructure. Extricom Series products
are enhanced to provide support for RTLS by integration with AeroScout and Ekahau active RFID
technology. Generally, device location is determined based on several APs picking up a radio
transmission attribute from an AeroScout or Ekahau Tag device or any Wi-Fi client, performing
measurements and reporting the measurements to an AeroScout or Ekahau Location Engine.
AeroScout and Ekahau positioning algorithms use Received Signal Strength Indicator (RSSI) to
determine object location.
Captive Portal –The Captive Portal technique compels any HTTP client to view a special web
page (usually for authentication purposes) before accessing the rest of the network. Captive Portal
turns a web browser into a secure authentication device. This is done by intercepting an internet
access request and redirecting it to an Extricom local logging web page which may require
authentication, or simply display an acceptable use policy and require the user to agree.
MAC authentication –MAC authentication enables the Extricom Series switch to authenticate
WLAN devices via RADIUS server even if they have no native support for 802.1x. This
mechanism is normally used in “dumb” device WLAN topology (such as barcode readers) in
which WLAN client authentication must be managed via a central RADIUS server.
WMM –Wi-Fi Alliance WMM is an 802.11 quality of service (QoS) implementation based on a
subset of the draft 802.11e standard supplement. The WMM specification provides basic
prioritization of data packets based on four categories - voice, video, best effort, and background.
Prioritization is based on the original Carrier Sense Multiple Access/Collision Avoidance Protocol
in the 802.11 standard. In 802.11, the Distributed Coordination Function (DCF) mechanism uses a
simple listen-before-talk algorithm to minimize the chance of packet collisions caused by more
than one device accessing the wireless medium at the same time. A client must wait for a
randomly selected time period and then "listen" to find whether any other device is
communicating before starting to transmit. The random back-off period gives all devices a fair
opportunity to transmit.

8 Introduction to the Extricom Series Wireless LAN System
WMM (based on 802.11e standard) enhances the DCF by defining an Enhanced Distributed
Channel Access (EDCA). EDCA specifies different fixed and random wait times for the four
prioritization categories to provide more favorable network access for applications that are less
tolerant of packet delays. Devices that have less time to wait have a better chance of being able to
transmit than those that have a longer wait. In order of highest priority, the access prioritization
categories are voice, video, best effort and background.
By default, these four WMM prioritization categories are statically mapped to Ethernet 802.1p
prioritization tags to allow consistent QoS across wireless and wired network segments. Flow
arriving from the wired network tagged with 802.1p priority is mapped to the appropriate Access
category, while WMM flow arriving from the wireless medium is encapsulated and tagged with
the appropriate 802.1p priority.
The back-off timing for each access category consists of a fixed period called the Arbitrary Inter-
Frame Space Number (AIFSN) followed by a random period called the Contention Window
(CW), both specified in multiples of the slot time. The CW maintains the DCF random back-off
component to help avoid collisions of packets from the same access category. The CW range
doubles each time there is a collision (starts CWmin up to CWmax) and is reset to its minimum
value after a successful transmission.
EDCA uses a mechanism called a Transmit Opportunity (TXOP) –a bounded time interval during
which a station can send as many frames as possible, but the transmission time must not extend
beyond the maximum duration of the TXOP. Each priority level is assigned a TXOP, and this
mechanism prevents low-speed stations from spending too much time using the media when other
clients (including those with traffic in higher priority queues) are waiting.
Another mechanism introduced by WMM is per-access category Acknowledgment policy
(Normal or No ACK). Normal means that an acknowledge packet is returned for every packet
received. This provides a more reliable transmission, but increases traffic load, which decreases
performance. However, one may choose to cancel the acknowledgement by selecting "No ACK"
for each access category. This can be useful for Voice, for example, where speed of transmission
is important, and packet loss is tolerable to a certain degree.
IPv6 support –The Extricom Series Switch family supports IPv6 pass-through. For example,
DHCP requests in IPV6 format are passed between the WLAN and the LAN.
Blanket balancing –The switches automatically perform load balancing, distributing the traffic
evenly over the different channels.
Low-density parity-check (LDPC) –Extricom Series Access Points support LDPC which
improves reception of packets over a noisy channel.
Space–time block coding (STBC) –Extricom Series Access Points support STBC which
improves the ability to transmit packets over a noisy channel.
Overview of the Switch Platforms
The Extricom Series WLAN switches are connected to Extricom Series APs to form an Extricom
WLAN. The Extricom Multi Series (MS) is a high-performance switch hardware platform, and is
software-configurable to support a range of wireless and networking functions in an Extricom
WLAN System.

Extricom Series WLAN System Installation and User Guide 9
Figure 2: AT-EXMS-1000
The AT-EXMS-1000 is equipped with 2 RJ45/SFP GBE Combo port uplinks and 16 GBE PoE
(Power over Ethernet) edge-side ports. The AT-EXMS-1000 is capable of performing different
wireless and networking functions, depending on the firmware installed on it.
Figure 3: AT-EXLV-2000
The AT-EXLV-2000 is equipped with 2 RJ45/SFP GBE Combo port uplinks and 16 GBE PoE
(Power over Ethernet) edge-side ports. The AT-EXLV-2000 is specifically designed to provide
wireless access in large-venue environments.
Figure 4: AT-EXLS-3000
The AT-EXLS-3000 is equipped with 2 RJ45/SFP GBE Combo port uplinks and 8 GBE ports to
connect AT-EXMS-1000 edge switches. The AT-EXLS-3000 controls up to 8 edge switches to
provide a Channel Blanket of up to 128 APs.

10 Introduction to the Extricom Series Wireless LAN System
Figure 5: AT-EXMS-500
The AT-EXMS-500 is equipped with 2 RJ45/SFP GBE Combo port uplinks and 8 GBE PoE edge-
side ports. The AT-EXMS-500 is capable of performing different wireless and networking
functions, depending on the firmware installed in it.
Configuring a switch and its associated set of APs is as simple as configuring a single traditional
AP, greatly reducing the effort required to deploy and maintain the WLAN. Configuration is done
via a dedicated, secured web interface that comes standard with every switch.

SFP modules are not shipped with the AT-EXMS-500/1000. To use the SFP ports,
you must use Class 1 laser certified SFP modules according to IEC/EN 60825-1
and /or CDRH.

Extricom Series WLAN System Installation and User Guide 11
Overview of the Extricom Series Access Points
Access Points with Internal Integrated Antennas
The two-radio AT-EXRP-22n and three-radio AT-EXRP-32n are 802.11n access points with
internal antennas for maximum throughput and easy deployment of 802.11n with or without legacy
Wi-Fi. The AT-EXRP-22n is equipped with two, and the AT-EXRP-32 - with three, dual-stream
radios, each of which can be operated on the 2.4 GHz or 5 GHz band. Each radio has a 2x2 MIMO
antenna configuration for an air rate of up to 300 Mbps.
The APs do not require configuration, enabling plug-and-play installation. If stolen, the APs do not
pose a security risk, since all encryption is performed in the switch.
With all intelligence residing in the WLAN switch, APs may be placed as close together as
necessary to provide high-quality, high-speed connectivity from all locations within the enterprise.
Extricom Series APs are connected to the Extricom Series WLAN Switch via standard Cat5e/6
cables. The APs are powered by the standard 802.3af Power over Ethernet (PoE), and only a single
Cat5e/6 cable connection is required to support all radios in an Extricom Series AP.
An EXRE-1000 range extender can be used between the AP and the switch, for extended reach.
Figure 6: AT-EXRP-22n/32n AP
Access Points with Connectors for External Antennas
Some applications may require an access point capable of connecting to external antenna(s). The
AT-EXRP-22En accommodates this requirement. The AT-EXRP-22En contains two dual-stream
802.11a/b/g/n radios and four external antenna connectors.
An external antenna may be desired to make the AP less visible by mounting it in the plenum. The
situations may arise, in which to ensure connectivity and service levels within a complex coverage
environment, directional antennas may be needed, rather than the omni-directional antennas that are
standard inside Extricom Series integrated antenna APs. In such cases, the antennas may also be
located at some distance from the AP in order to cover a specific area.

12 Introduction to the Extricom Series Wireless LAN System
Figure 7: AT-EXRP-22En AP
The AT-EXRP-22En AP is connected to the Extricom Series WLAN Switch via standard Cat5e/6
cables, in exactly the same manner as integrated antenna AP models. The APs are powered by the
standard 802.3af Power over Ethernet (PoE), but can be powered by an external power supply if
desired.
An antenna with an RP-SMA plug (male) connector can be connected to the AT-EXRP-22En. For
purposes of product homologation testing, a “Rubber Duck” type antenna was used, specifically the
Netgate 2.4-2.5 / 5.1-5.9 GHz Dual Band Rubber Duck RP-SMA (part number: ANT-2458-5RD-
RSP). More specifications on this antenna can be found at
http://www.netgate.com/product_info.php?products_id=386.
!
With AT-EXRP-22En: Use only xPVC or similar jacket cable which is NEC Article
725 and 444 Compliant and plenum rated per NFPA 262 (UL 910) standard.
Outdoor Access Points with Connectors for External Antennas
Outdoor applications may require rugged, waterproof access points: The AT-EXRP-32EOn
accommodates this requirement. The AT-EXRP-32EOn features a waterproof IP67-rated rugged
die-cast aluminum enclosure with N-type connectors for external antennas, ensuring it performs
flawlessly in outdoor weather and in harsh indoor conditions. The AT-EXRP-32Eon contains three
802.11a/b/g/n radios. The AT-EXRP-32EOn has six external antenna connectors.