Cisco Aironet 1850 Series User manual

GETTING STARTED GUIDE
Cisco Aironet 1850 Series Access Points
First Published: July 28, 2015
Last Updated: November 5, 2015
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1About this Guide
2About the Access Point
3Safety Instructions
4Unpacking the AP
5Ports and Connectors on the AP
6Preparing the AP for Installation
7Installation Overview
8Performing a Pre-Installation Configuration
9Mounting and Grounding the Access Point
10 Powering the Access Point
11 Configuring and Deploying the Access Point
12 Checking the Access Point LEDs
13 Miscellaneous Usage and Configuration Guidelines
14 Related Documentation
15 Declarations of Conformity and Regulatory Information

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1 About this Guide
This guide provides instructions on how to install and configure your Cisco Aironet 1850 Series Access
Point. This guide also provides mounting instructions and limited troubleshooting procedures.
The 1850 Series Access Point is referred to as the access point, or abbreviated as AP in this document.
2 About the Access Point
The Cisco Aironet 1850 series access point is an 802.11 a/b/g/n/ac (Wave 2) access point, with both
external antenna (AP1852E) and internal antenna (AP1852I) models. This access point can be
mounted on a wall or a ceiling, and supports 2.4 GHz 3x4 802.11b/g/n MIMO and 5 GHz 4x4 802.11
a/n/ac (Wave 2) MIMO applications simultaneously.
Access Point Model Numbers and Regulatory Domains
The Cisco Aironet 1850 series access point comes in both universal regulatory domain and
non-universal regulatory domain model number formats. See the following table for the model number
formats.
The ‘UX’ in a model number indicates a universal regulatory domain access point. For information on
how to set the regulatory domain and country configurations of a universal regulatory domain access
point, see the Cisco Aironet Universal AP Priming and Cisco AirProvision User Guide, at:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/ux-ap/guide/uxap-mobapp-g.html
The ‘x’ placeholder in the other model numbers represents the regulatory domain. The ‘x’ can be any
one of these supported regulatory domains: A, B, C, D, E, F, H, I, K, N, Q, R, S, T, Z.
For more information on supported regulatory domains, see the following page:
Universal Regulatory Domain
Model Number Format
Non- Universal Regulatory
Domain Model Number Format
External antenna models AIR-AP1852E-UXK9
AIR-AP1852E-UXK9C
AIR-AP1852E-x-K9
AIR-AP1852E-x-K9C
Internal antenna models AIR-AP1852I-UXK9
AIR-AP1852I-UXK9C
AIR-AP1852I-x-K9
AIR-AP1852I-x-K9C

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http://www.cisco.com/c/en/us/products/collateral/wireless/access-points/product_data_sheet0900aecd
80537b6a.html
Model numbers ending in Care factory-shipped with a Cisco Mobility Express software image. For
more information, see the Cisco Mobility Express User Guide at the following URL:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/1/user_guide/b_ME_User_Guid
e.html
Access Point Features
The features of the 1850 series access points are:
•Supported mode(s) of operation:
– Centralized
•Supports Cisco Mobility Express solution. The 1850 series access point can operate as a master
AP (having an integrated wireless controller functionality) in a Cisco Mobility Express network.
For more information, see the Cisco Mobility Express User Guide at the following URL:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/1/user_guide/b_ME_User_
Guide.html
•Radio features supported are:
– 2.4 GHz and 5 GHz concurrent radios
– 2 GHz radio with 3TX x 4RX and three spatial streams SU-MIMO
– 5 GHz radio with 4TX x 4RX 802.11ac Wave 2 capable with four spatial stream SU-MIMO
and 3 spatial streams MU-MIMO
– 802.11ac based Transmit Beamforming
– Quality of Service (QoS)
– Radio Resource Management (RRM)
– Rogue Detection
– BandSelect
•The AP supports the following hardware external interfaces:
– RS-232 Console Interface through RJ-45
– Local Power DC Jack
– Mode button. For information on how to use the Mode button, see “Using the Mode Button”
section on page 23.
– USB 2.0 port (no software support at this time)

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– One multi-color LED status indicator. See the “Checking the Access Point LEDs” section on
page 21 for information on the colors of the LED status indicator.
– 1 x 10/100/1000 Mbps WAN Ethernet Port (RJ-45), with PoE support.
– 1 x 10/100/1000 Mbps Auxiliary Ethernet port (RJ-45). For the Link Aggregation feature
only. Does not require or provide PoE support.
•1852I model access point has four integrated 2.4 GHz/5 GHz dual-band antennas located near
each corner of the 1852I access point under the top housing. Peak antenna gain is approximately
3 dBi and 5 dBi in 2.4 GHz and 5 GHz bands respectively.
•The 1852E model supports up to four external antennas using the RTNC antenna connectors on
the top of the access point. The following Cisco external antennas are supported on the 1852E:
– AIR-ANT2524DB-R
– AIR-ANT2524DG-R
– AIR-ANT2524DW-R
– AIR-ANT2535SDW-R
– AIR-ANT2524V4C-R
– AIR-ANT2566P4W-R
– AIR-ANT2566D4M-R
– AIR-ANT2544V4M-R
A full listing of the access point's features and specification are provided in the Cisco Aironet 1850
Series Access Point Data Sheet, at the following URL:
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1850-series-access-points/datashee
t-c78-734256.html

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3 Safety Instructions
Translated versions of the following safety warnings are provided in the translated safety warnings
document that is shipped with your access point. The translated warnings are also in the Translated
Safety Warnings for Cisco Aironet Access Points, which is available on Cisco.com.
Warning IMPORTANT SAFETY INSTRUCTIONS
This warning symbol means danger. You are in a situation that could cause bodily injury.
Before you work on any equipment, be aware of the hazards involved with electrical
circuitry and be familiar with standard practices for preventing accidents. Use the
statement number provided at the end of each warning to locate its translation in the
translated safety warnings that accompanied this device.
Statement 1071
SAVE THESE INSTRUCTIONS
Warning Read the installation instructions before you connect the system to its power source.
Statement 1004
Warning Installation of the equipment must comply with local and national electrical codes.
Statement 1074
Warning This product relies on the building’s installation for short-circuit (overcurrent)
protection. Ensure that the protective device is rated not greater than:
20A. Statement 1005
Warning Do not operate your wireless network device near unshielded blasting caps or in an
explosive environment unless the device has been modified to be especially qualified for
such use. Statement 245B
Caution The fasteners you use to mount an access point on a ceiling must be capable of
maintaining a minimum pullout force of 20 lbs (9 kg) and must use a minimum of 4 holes
on the mounting bracket, or a minimum of 2 holes when mounting on a network box.

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Caution This product and all interconnected equipment must be installed indoors within the same
building, including the associated LAN connections as defined by Environment A of the
IEEE 802.3af/at Standard.
Note The access point is suitable for use in environmental air space in accordance with section
300.22.C of the National Electrical Code and sections 2-128, 12-010(3), and 12-100 of
the Canadian Electrical Code, Part 1, C22.1. You should not install the power supply or
power injector in air handling spaces.
Note Use only with listed Information Technology Equipment (ITE) equipment. For more
information on ITE equipment, refer to article 645 of the latest National Electrical Code
(NEC).
4 Unpacking the AP
To unpack the access point, follow these steps:
Step 1 Unpack and remove the access point and the mounting accessories and antennas, if included
for external antenna model access points, from the shipping box.
Step 2 Return any packing material to the shipping container and save it for future use.
Step 3 Verify that you have received the items listed below. If any item is missing or damaged, contact
your Cisco representative or reseller for instructions.
– The access point
– Mounting bracket (AIR-AP-BRACKET-1= or AIR-AP-BRACKET-2=, only if selected when
you ordered the access point)
– T-RAIL clips and Channel Adapter (only if selected when you ordered the access point)

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5 Ports and Connectors on the AP
The 1850 series access points have an LED indicator on the face of the unit, above the Cisco logo, as
shown in Figure 1. For information on the LED scheme, see the “Access Point Status LEDs” section
on page 21.
The ports and connections on the access point are shown in Figure 2.
Figure 1 Access Point LED Indicator Position
1LED indicator position on both internal and external antenna models. For information on the
LED scheme, see the “Access Point Status LEDs” section on page 21.
353951
1

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Figure 2 Access Point Ports and Connections
1Security hasp for padlocking AP to mounting
bracket
5AUX (Auxiliary) port.
This port appears in the wireless controller
user interface as GigabitEthernet1. This
port, along with the PoE-In port, is used for
Link Aggregation. This port is disabled when
using 802.3af (15.4W) power.
2Mode button
For information on how to use the Mode
button, see “Using the Mode Button” section
on page 23.
6PoE-In port (Ethernet Uplink port)
3RJ-45 console port 748 V DC input power port
4USB 2.0 port
(no software support at this time)
353813
1 2 3 4 5 6 7

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6 Preparing the AP for Installation
Before you mount and deploy your access point, we recommend that you perform a site survey (or use
the site planning tool) to determine the best location to install your access point.
You should have the following information about your wireless network available:
•Access point locations.
•Access point mounting options: below a suspended ceiling, on a flat horizontal surface, or on a
desktop.
Note You can mount the access point above a suspended ceiling but you must purchase
additional mounting hardware: See “Mounting and Grounding the Access Point” section
on page 15 for additional information.
•Access point power options: power supplied by the recommended external power supply (Cisco
AIR-PWR-C), a DC power supply, PoE from a network device, or a PoE power injector/hub
(usually located in a wiring closet).
Note Access points mounted in a building’s environmental airspace must be powered using PoE
to comply with safety regulations.
Cisco recommends that you make a site map showing access point locations so that you can record the
device MAC addresses from each location and return them to the person who is planning or managing
your wireless network.
7 Installation Overview
Installing the access point involves these operations:
Step 1 Performing a Pre-Installation Configuration, page 11 (optional)
Step 2 Mounting and Grounding the Access Point, page 15
Step 3 Powering the Access Point, page 16
Step 4 Configuring and Deploying the Access Point, page 18

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8 Performing a Pre-Installation Configuration
For a Cisco Mobility Express deployment, see the Cisco Mobility Express User Guide at this URL:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/1/user_guide/b_ME_User_Guid
e.html
The following procedures ensure that your access point installation and initial operation go as
expected. This procedure is optional.
Note Performing a pre-installation configuration is an optional procedure. If your network
controller is properly configured, you can install your access point in its final location and
connect it to the network from there. See the “Deploying the Access Point on the Wireless
Network” section on page 20 for details.
The following Pre-Installation Configuration procedure given does not include configuring Link
Aggregation. For information on configuring Link Aggregation, see the Cisco Wireless LAN
Controller Configuration Guide, Release 8.1, at this URL:
http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/configuration-guide/b_cg81.html
The pre-installation configuration setup is illustrated in Figure 3.

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Figure 3 Pre-Installation Configuration Setup
To perform pre-installation configuration, perform the following steps:
Step 1 Make sure that the Cisco wireless LAN controller DS port is connected to the network. Use
the CLI, web-browser interface, or Cisco Prime Infrastructure procedures as described in the
appropriate Cisco wireless LAN controller guide.
a. Make sure that access points have Layer 3 connectivity to the Cisco wireless LAN controller
Management and AP-Manager Interface.
b. Configure the switch to which your access point is to attach. See the Cisco Wireless LAN
Controller Configuration Guide for the release you are using, for additional information.
c. Set the Cisco wireless LAN controller as the master so that new access points always join with
it.
d. Make sure DHCP is enabled on the network. The access point must receive its IP address
through DHCP.
e. CAPWAP UDP ports must not be blocked in the network.
f. The access point must be able to find the IP address of the controller. This can be
accomplished using DHCP, DNS, or IP subnet broadcast. This guide describes the DHCP
method to convey the controller IP address. For other methods, refer to the product
Controller
Layer 3
devices
Cisco Aironet
access points
354066
Link Aggregation Link Aggregation

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documentation. See also the “Configuring DHCP Option 43” section on page 26 for more
information.
Note The access point requires a gigabit Ethernet (GbE) link to prevent the Ethernet port from
becoming a bottleneck for traffic because wireless traffic speeds exceed transmit speeds
of a 10/100 Ethernet port.
Step 2 Apply power to the access point. See Powering the Access Point, page 16.
a. As the access point attempts to connect to the controller, the LEDs cycle through a green, red,
and amber sequence, which can take up to 5 minutes.
Note If the access point remains in this mode for more than five minutes, the access point is
unable to find the Master Cisco wireless LAN controller. Check the connection between
the access point and the Cisco wireless LAN controller and be sure that they are on the
same subnet.
b. If the access point shuts down, check the power source.
c. After the access point finds the Cisco wireless LAN controller, it attempts to download the
new operating system code if the access point code version differs from the Cisco wireless
LAN controller code version. While this is happening, the Status LED blinks amber.
d. If the operating system download is successful, the access point reboots.
Step 3 Configure the access point if required. Use the controller CLI, controller GUI, or Cisco Prime
Infrastructure to customize the access-point-specific 802.11ac network settings.
Step 4 If the pre-installation configuration is successful, the Status LED is green indicating normal
operation. Disconnect the access point and mount it at the location at which you intend to
deploy it on the wireless network.
Step 5 If your access point does not indicate normal operation, turn it off and repeat the
pre-installation configuration.

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Note When you are installing a Layer 3 access point on a different subnet than the Cisco
wireless LAN controller, be sure that a DHCP server is reachable from the subnet on
which you will be installing the access point, and that the subnet has a route back to
the Cisco wireless LAN controller. Also be sure that the route back to the Cisco
wireless LAN controller has destination UDP ports 5246 and 5247 open for CAPWAP
communications. Ensure that the route back to the primary, secondary, and tertiary
wireless LAN controller allows IP packet fragments. Finally, be sure that if address
translation is used, that the access point and the Cisco wireless LAN controller have
a static 1-to-1 NAT to an outside address. (Port Address Translation is not
supported.)

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9 Mounting and Grounding the Access Point
Cisco Aironet 1852 series access points can be mounted in several configurations – on a suspended
ceiling, on a hard ceiling or wall, on an electrical or network box, and above a suspended ceiling.
Go to the following URL for access point mounting instructions:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mounting/guide/apmount.html
The standard mounting hardware supported by the AP is listed in Table 1.
Table 1 Brackets and Clips for Mounting the AP
Part Number Description
Brackets AIR-AP-BRACKET-1 Low-profile bracket
(This is the default option)
AIR-AP-BRACKET-2 Universal bracket
Clips AIR-AP-T-RAIL-R Ceiling Grid Clip (Recessed mounting)
(This is the default option)
AIR-AP-T-RAIL-F Ceiling Grid Clip (Flush mounting)
AIR-CHNL-ADAPTER Optional adapter for channel-rail ceiling grid
profile.

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10 Powering the Access Point
The AP can be powered using:
•48 V DC power via the 48VDC port, using Cisco Power Adapter AC DC AIR-PWR-C=. Ensure
that the power cable is routed through the strain relief retention clips cast into the enclosure. See
Figure 4.
•Power-over-Ethernet (PoE) from the Ethernet cable, from an external power source such as the
Cisco Power Injector AIR-PWRINJ4=.You can also use the AIR-PWRINJ5 Cisco Power Injector
but with reduced functionality.
•Any 802.3at (25.5 W) or 802.3af (15.4 W) compliant power injector.
However, when powered by an 802.3af powering source, the following operations are supported:
– For 1852I – the AUX and USB ports are disabled. Both radios operate at full operation.
– For 1852E – the AUX and USB ports are disabled. The 2.4GHz radio will shift to 2x3:2SS
operation and the 5GHz radio will remain at full operation.
With an 802.3at or the AIR-PWR-C= as the power source, the AP1852I/E provides full operation
including the AUX and USB ports.

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Figure 4 Routing the DC Power Cable
1Kensington lock slot 4DC power cable plugged into the 48VDC
port
2Power cable routed through the strain relief
retention clips 5AP secured using a padlock
3DC power cable
353859
1
23
4 5

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11 Configuring and Deploying the Access Point
This section describes how to connect the access point to a wireless LAN controller. Because the
configuration process takes place on the controller, see the Cisco Wireless LAN Controller
Configuration Guide for additional information.
For a Cisco Mobility Express deployment, see the Cisco Mobility Express User Guide at this URL:
http://www.cisco.com/c/en/us/td/docs/wireless/access_point/mob_exp/1/user_guide/b_ME_User_Guid
e.html
The information in this section does not include configuring Link Aggregation. For information on
configuring Link Aggregation, see the Cisco Wireless LAN Controller Configuration Guide, Release
8.1, at the following URL:
http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/configuration-guide/b_cg81.html
The Controller Discovery Process
The access point uses standard Control and Provisioning of Wireless Access Points Protocol
(CAPWAP) to communicate between the controller and other wireless access points on the network.
CAPWAP is a standard, inter-operable protocol which enables an access controller to manage a
collection of wireless termination points. The discovery process using CAPWAP is identical to the
Lightweight Access Point Protocol (LWAPP) used with previous Cisco Aironet access points.
LWAPP-enabled access points are compatible with CAPWAP, and conversion to a CAPWAP controller
is seamless. Deployments can combine CAPWAP and LWAPP software on the controllers.
The functionality provided by the controller does not change except for customers who have Layer 2
deployments, which CAPWAP does not support.
In a CAPWAP environment, a wireless access point discovers a controller by using CAPWAP discovery
mechanisms and then sends it a CAPWAP join request. The controller sends the access point a
CAPWAP join response allowing the access point to join the controller. When the access point joins
the controller, the controller manages its configuration, firmware, control transactions, and data
transactions.
Note For additional information about the discovery process and CAPWAP, see the Cisco Wireless
LAN Controller Software Configuration Guide. This document is available on Cisco.com.

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Note CAPWAP support is provided in controller software release 5.2 or later. However, your
controller must be running the release that supports 1850 series access points, as specified in
the access point’s data sheet.
Note You cannot edit or query any access point using the controller CLI if the name of the access
point contains a space.
Note Make sure that the controller is set to the current time. If the controller is set to a time that
has already occurred, the access point might not join the controller because its certificate may
not be valid for that time.
Access points must be discovered by a controller before they can become an active part of the network.
The access point supports these controller discovery processes:
•Layer 3 CAPWAP discovery—Can occur on different subnets than the access point and uses IP
addresses and UDP packets rather than MAC addresses used by Layer 2 discovery.
•Locally stored controller IP address discovery—If the access point was previously joined to a
controller, the IP addresses of the primary, secondary, and tertiary controllers are stored in the
access point’s non-volatile memory. This process of storing controller IP addresses on an access
point for later deployment is called priming the access point. For more information about priming,
see the “Performing a Pre-Installation Configuration” section on page 11.
•DHCP server discovery—This feature uses DHCP option 43 to provide controller IP addresses to
the access points. Cisco switches support a DHCP server option that is typically used for this
capability. For more information about DHCP option 43, see the “Configuring DHCP Option 43”
section on page 26.
•DNS discovery—The access point can discover controllers through your domain name server
(DNS). For the access point to do so, you must configure your DNS to return controller IP
addresses in response to CISCO-CAPWAP-CONTROLLER.localdomain, where localdomain is
the access point domain name. Configuring the CISCO-CAPWAP-CONTROLLER provides
backwards compatibility in an existing customer deployment. When an access point receives an IP
address and DNS information from a DHCP server, it contacts the DNS to resolve
CISCO-CAPWAP-CONTROLLER.localdomain. When the DNS sends a list of controller IP
addresses, the access point sends discovery requests to the controllers.

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Deploying the Access Point on the Wireless Network
After you have mounted the access point, follow these steps to deploy it on the wireless network:
Step 1 Connect and power up the access point.
Step 2 Observe the access point LED (for LED descriptions, see “Checking the Access Point LEDs”
section on page 21).
a. When you power up the access point, it begins a power-up sequence that you can verify by
observing the access point LED. If the power-up sequence is successful, the discovery and join
process begins. During this process, the LED blinks sequentially green, red, and off. When the
access point has joined a controller, the LED is chirping green if no clients are associated or
green if one or more clients are associated.
b. If the LED is not on, the access point is most likely not receiving power.
c. If the LED blinks sequentially for more than 5 minutes, the access point is unable to find its
primary, secondary, and tertiary Cisco wireless LAN controller. Check the connection
between the access point and the Cisco wireless LAN controller, and be sure the access point
and the Cisco wireless LAN controller are either on the same subnet or that the access point
has a route back to its primary, secondary, and tertiary Cisco wireless LAN controller. Also,
if the access point is not on the same subnet as the Cisco wireless LAN controller, be sure that
there is a properly configured DHCP server on the same subnet as the access point. See the
“Configuring DHCP Option 43” section on page 26 for additional information.
Step 3 Reconfigure the Cisco wireless LAN controller so that it is not the Master.
Note A Master Cisco wireless LAN controller should be used only for configuring access
points and not in a working network.