Cisco MERAKI MR42 Manuale utente
MR42 nstallation Guide
The Cisco Meraki MR42 is a dual-band enterprise class 802.11ac cloud-managed access point. Designed for high
capacity and high density, the MR42 meets the needs of the most demanding environments, and also includes the first
ever cloud-managed third radio dedicated to optimizing the RF environment and securing the airwaves.
About this Guide
This guide provides instruction on how to install and configure your MR42 access points. This guide also provides
mounting instructions and limited troubleshooting procedures. For more wireless installation guides, refer to the wireless
installation guides section on our documentation website.
Product Overview
Physical Specifications
MR42
Interfaces
• 1x 10/100/1000 BASE-T Ethernet (RJ45)
• 1x DC power connector (5.5 mm x 2.5 mm, center positive)
Power
• Power over Ethernet: 37 - 57 V (802.3at required with
functionality-restricted 802.3af mode supported)
•Alternative: 12 V DC input
•Power consumption: 20W max (802.3at)
•Power over Ethernet injector and DC adapter sold separately
Environment
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• Operating temperature: 32 °F to 104 °F (0 °C to 40 °C)
• Storage and Transportation Temperature: -4 °F to 158 °F (-20
°C to 70 °C)
• Humidity: 5 to 95% non-condensing
Physical Security
• Two security screw options (included) (10 mm long and 2.5 mm
diameter and 4.7 mm head)
• Kensington lock hard point
• Concealed mount plate with anti-tamper cable bay
Product View and Physical Features
Your Meraki MR42 has the following features:
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The mount cradle has the following features:
Security Features
The MR42 features multiple options for physically securing the access point after installation:
1. Security screw – The accessory kit includes screws that can be used to secure the access point to the mount
cradle. Engaging the security screw prevents accidental dislodging and theft.
2. Kensington lock – The access point contains a hard point that allows it to be secured to any nearby permanent
structure using a standard Kensington lock.
Ethernet Ports
The MR42 features a Gigabit Ethernet RJ45 port that accepts 802.3at and 802.3af power (labeled “Eth0, PoE”). This
port should be used for uplink to your WAN connection.
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The port labeled “PoE” accepts 802.3at and 802.3af power and should be used as the primary uplink to your LAN/
WAN.
Power Source Options
The MR42 access point can be powered using either the Meraki AC Adapter, PoE njector (both sold separately), or a
third-party PoE switch.
The MR42 will function in low power mode when powered by a 802.3af power source. While in low power mode, the
MR42 will disable its Air Marshal radio as well as two out of three transmit streams on the 2.4 Ghz band. Despite being
in low power mode, the device can still supply full 802.11ac capabilities.
Factory Reset Button
f the button is pressed and held for at least five seconds and then released, the MR42 will reboot and be restored to its
original factory settings by deleting all configuration information stored on the unit.
LED ndicators and Run Dark Mode
Your MR42 is equipped with a multi-color LED light on the front of the unit to convey information about system
functionality and performance:
• Orange - AP is booting (permanent Orange suggests hardware issue)
• Rainbow - AP is initializing/scanning
• Blinking Blue - AP is upgrading
• Green - AP in Gateway mode with no clients
• Blue - AP in Gateway mode with clients
• Blinking Orange - AP can't find uplink
NOTE: Blinking Green LED indicates that the device is in site survey mode. Please see the Conducting Site Surveys
with MR Access Points for more details.
The MR42 may be operated in “Run Dark” mode for additional security and to reduce the visibility of the access point. n
this mode, the LED will not be illuminated. This mode may be enabled through Meraki dashboard.
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Package Contents
The MR42 package contains the following:
• MR42 Cloud-Managed Access Point
• Mount cradle including built-in level tool
• Drop ceiling mount kit
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• Wall screws, wall screw anchors, and security screws
• Spare hardware
Safety and Warnings
These operations are to be taken with respect to all local laws. Please take the following into consideration for safe
operation:
• Power off the unit before you begin. Read the installation instructions before connecting the system to the power
source.
• Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with
standard practices for preventing accidents.
• Read the wall-mounting instructions carefully before beginning installation. Failure to use the correct hardware or to
follow the correct procedures could result in a hazardous situation to people and damage to the system.
• This product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that the protective
device is rated not greater than: 15 A, 125 Vac, or 10A, 240 Vac.
• Please only power the device with the provided power cables or standard PoE to ensure regulatory compliance.
Pre- nstall Preparation
You should complete the following steps before going on-site to perform an installation.
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Configure Your Network in Dashboard
The following is a brief overview only of the steps required to add an MR42 to your network. For detailed instructions
about creating, configuring and managing Meraki wireless networks, refer to the online documentation
(documentation.meraki.com).
1. Login to http://dashboard.meraki.com. f this is your first time, create a new account.
2. Find the network to which you plan to add your APs or create a new network.
3. Add your APs to your network. You will need your Meraki order number (found on your invoice) or the serial
number of each AP, which looks like Qxxx-xxxx-xxxx, and is found on the bottom of the unit. You will also need
your Enterprise license key, which you should have received via email.
4. Go to the map / floor plan view and place each AP on the map by clicking and dragging it to the location where you
plan to mount it.
Check and Upgrade Firmware
To ensure your MR42 performs optimally immediately following installation, it is recommended that you facilitate a
firmware upgrade prior to mounting your MR42.
1. Attach your MR42 to power and a wired nternet connection. See the "Power the MR42" section for details.
2. The MR42 will turn on and the LED will glow solid orange. f the unit does not require a firmware upgrade, the LED
will turn either green (no clients associated) or blue (clients associated) within thirty seconds.
* f the unit requires an upgrade, the LED will begin blinking orange until the upgrade is complete, at which point the LED
will turn solid green or blue. You should allow at least a few minutes for the firmware upgrade to complete, depending on
the speed of your internet connection.
Check and Configure Firewall Settings
f a firewall is in place, it must allow outgoing connections on particular ports to particular P addresses. The most
current list of outbound ports and P addresses for your particular organization can be found here.
Assigning P Addresses to MR42s
All gateway MR42s (MR42s with Ethernet connections to the LAN) must be assigned routable P addresses. These P
addresses can be dynamically assigned via DHCP or statically assigned.
Dynamic Assignment
When using DHCP, the DHCP server should be configured to assign a static P address for each MAC address
belonging to a Meraki AP. Other features of the wireless network, such as 802.1X authentication, may rely on the
property that the APs have static P addresses.
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Static Assignment
Static Ps are assigned using the local web server on each AP. The following procedure describes how to set the
static P:
1. Using a client machine (e.g., a laptop), connect to the AP wirelessly (by associating to any SS D
broadcast by the AP).
2. Using a web browser on the client machine, access the AP’s built-in web server by browsing
to http://my.meraki.com. Alternatively, browse to http://10.128.128.128.
3. Click on the “Uplink Configuration” tab. Log in. The default login is the serial number (e.g. Qxxx-xxxx-
xxxx), with no password (e.g., Q2DD-551C-ZYW3).
4. Configure the static P address, net mask, gateway P address and DNS servers that this AP will use on
its wired connection.
5. f necessary, reconnect the AP to the LAN.
Static IP via DHCP Reservations
nstead of associating to each Meraki AP individually to configure static P addresses, an administrator can
assign static P addresses on the upstream DHCP server. Through “DHCP reservations,” P addresses are
“reserved” for the MAC addresses of the Meraki APs. Please consult the documentation for the DHCP server to
configure DHCP reservations.
Collect Tools
You will need the following tools to perform an installation:
Collect Additional Hardware for nstallation
You will need the following hardware to perform an installation:
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nstallation nstructions
Choose Your Mounting Location
A good mounting location is important to getting the best performance out of your MR42 access point. Keep the
following in mind:
1. The device should have unobstructed line of sight to most coverage areas. For example, if installing in an office
filled with workspaces divided by mid-height cubicle walls, installing on the ceiling or high on a wall would be ideal.
2. Power over Ethernet supports a maximum cable length of 300 ft (100 m).
3. f being used in a mesh deployment, the MR42 should have line of sight to at least two other Meraki devices. A
Cisco Partner can help ensure that your AP placement is ideal.
nstall the MR42
For most mounting scenarios, the MR42 mount cradle provides a quick, simple, and flexible means of mounting your
device. The installation should be done in two steps. First, install the mount cradle to your selected location. Then,
attach the MR42 to the mount cradle.
Attach the mount cradle
The MR42 mount cradle can be used to install your access point in a wide range of scenarios: wall or solid ceiling, below
a drop ceiling, on various electrical junction boxes.
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The mount cradle contains a variety of hole patterns that are customized for each installation scenario. The mounting
template (included inbox with mount cradle) should be used to drill holes for wall mounts and also to identify the correct
hole patterns in the mount cradle that should be used for each type of mount. The included mount cradle
template shows the hole patterns that should be used for each type of mount.
Wall or Solid Ceiling Mount Using mount cradle
Using included wall anchors and screws, attach the mount cradle to your mounting wall or ceiling. t is
recommended that the MR42 be mounted to a wall or solid ceiling using the mount cradle for physical security
reasons.
Drop ceiling mount using mount cradle
To mount your MR42 on a drop ceiling T-rail, use the included drop ceiling mounting accessory kit. The
accessory kit can be used to mount to most 9/16”, 15/16” or 1 ½” T-rails. The kit contains:
• Drop ceiling mounting clips with set screws
• 6-32x4 mm screws
• 6-32x7 mm screws only used for recessed rail mount (uncommon)
• 2 rubber spacers
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