Trapeze Mobility Point MP-620 User manual

Trapeze Networks, Inc.
5753 W. Las Positas Blvd.
Pleasanton, CA 94588
Tel: [phone]
Fax: [phone]
Toll-Free: 877-FLY-TRPZ (877-359-8779) Part Number: 730-9502-0293 Rev. B
For the most current version of all documentation, go to
www.trapezenetworks.com
Outdoor Mobility Point Quick Start Guide v.7.1

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This guide provides basic hardware installation instructions for MP access point models MP-620,
MP-622, and MP-632. The MP-620, MP-622, and MP-632 are suitable for installation outdoors.
Warning! Installation must be performed by qualified service personnel only. Read and
follow all warning notices and instructions marked on the product or included in the
documentation. Before installing the product, read the rest of this document.
Waarschuwing! De installatie mag alleen worden uitgevoerd door bevoegd
onderhoudspersoneel. Het is essentieel dat u kennis neemt van alle waarschuwingen en
instructies aangebracht op het product zelf en/of opgenomen in de documentatie.
Voordat u het product installeert, dient u dit document in zijn geheel te hebben gelezen.
Warnung! Die Installation darf nur von qualifiziertem Servicepersonal vorgenommen
werden. Lesen und befolgen Sie alle Warnhinweise und -anleitungen auf dem Produkt
bzw. in der Dokumentation. Lesen Sie vor Installation des Produkts den restlichen Teil
dieses Dokuments.
Avertissement! L’installation ne peut être effectuée que par un personnel qualifié.
Lisez et suivez tous les messages d’avertissement et les instructions inscrits sur le
produit ou inclus dans la documentation. Avant d’installer le produit, lisez le reste de ce
document.
Attenzione! L’installazione deve essere effettuata unicamente da personale
qualificato. Leggere e rispettare tutte le segnalazioni di attenzione e le istruzioni
indicate sul prodotto o incluse nella documentazione. Prima d’installare il prodotto,
leggere tutto il documento.
¡Advertencia! La instalación debe realizarse exclusivamente por parte de personal de
servicio cualificado. Lea y siga todas las notas de advertencia e instrucciones en el
producto o la documentación. Antes de instalar el producto deberá leer la parte restante
del presente documento.

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¡Advertencia! A instalação dever ser realizada exclusivamente por pessoal de serviço
qualificado. Leia e siga todas as notas de advertência e instrucões no produto ou na
documentação. Antes de instalar o produto deverá ler a parte restante do presente
documento.
Varning! Installation får endast utföras av kvalificerad servicepersonal. Läs och följ
alla varningsmeddelanden och instruktioner markerade på produkten eller inkluderade
i dokumenteringen. Innan produkten installeras skall resten av dessa dokument läsas.
Advarsel! Installation må kun gennemføres af faglært servicepersonale. Læs, og følg
alle de advarselsmeddelelser og anvisninger, der er anført på produktet eller i
dokumentationen. Læs resten af dette dokument før installation af produktet.
Advarsel! Installasjon skal kun utføres av kvalifisert service personell. Les og følg alle
varsels meldinger og instrukssjons merkinger på produktet og i veiledningen. Les
resten av denne veiledningen før produktet installeres.
Varoitus! Installatie dient uitsluitend plaats te vinden door bevoegde monteurs. Lees
alle waarschuwingen en instructies die op het product zijn aangegeven of in de
documentatie zijn opgenomen, en volg deze op. Lees voordat u het product installeert
eerst de rest van dit document.
Viðvörun! Aðeins hæfir þjónustufulltrúar mega sinna uppsetningu tækjanna. Lesið og
fylgið öllum viðvörunum og leiðbeiningum í þessum gögnum. Lesið restina af þessum
gögnum fyrir uppsetningu.

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For more information about MP installation as well as safety and installation requirements, see the
following:
❑Outdoor Mobility Point Installation Guide v.7.1
❑For detailed compliance information see the Trapeze Regulatory Guide located at:
http://www.trapezenetworks.com/support/contact_support/. The guide can be downloaded
in PDF format.
MP-620
The MP-620 provides wireless access point services for clients in the local LAN area, and can provide
point-to-point or point-to-multipoint wireless bridge links between remote Ethernet LANs. The MP is
housed in a weatherproof enclosure for mounting outdoors and includes brackets for attaching to a
wall, pole, radio mast, or tower structure. The unit is powered through an Ethernet cable connection
from a power injector module installed indoors. The MP-620 provides a 54 Mbps half-duplex
connection for each active channel.
A wireless bridge system offers a solution for connectivity between remote Ethernet wired LANs, or to
provide Internet access to an isolated site where a wired link may be difficult or expensive to deploy.
The wireless bridge connection provides data rates of up to 108 Mbps.
Radio Characteristics – The IEEE 802.11a and 802.11g standards use a radio modulation
technique known as Orthogonal Frequency Division Multiplexing (OFDM), and a shared collision
domain (CSMA/CA). The 802.11a standard operates in the 5 GHz Unlicensed National Information
Infrastructure (UNII) band, and the 802.11g standard in the 2.4 GHz band.
IEEE 802.11g includes backward compatibility with the IEEE 802.11b standard. IEEE 802.11b also
operates at 2.4 GHz, but uses Direct Sequence Spread Spectrum (DSSS) and Complementary Code
Keying (CCK) modulation technology to achieve a communication rate of up to 11 Mbps.
MP-622
The MP-622 provides only external antenna options and is designed to operate as the “root bridge” in
point-to-multipoint configurations, supporting wireless bridge connections to as many as six units.
The MP is housed in a weatherproof enclosure for mounting outdoors and includes brackets for
attaching to a wall, pole, radio mast, or tower structure. The unit is powered through an Ethernet
cable connection from a power injector module installed indoors. The wireless bridge connection
provides data rates of up to 54 Mbps.
MP-632
The MP-632 is a 802.11a/b/g/n outdoor AP that is designed for pole-mounting and wall mounting. The
MP-632 supports 6 antenna ports, three for the 11a/n radio and three for the 11b/g/n radio. An MX
cannot be used to power the outdoor AP. An XPS-6201-OUT or XPS-6202-OUT outdoor power supply
that uses the IP67 multi-pin DIN connector is required. The MP-632 supports a new set of external
antennas that are commercially available. The MP-632 does not support internal antennas or PoE
The MP-632 must only be used with a Trapeze-approved XPS-6201-OUT or
XPS-6202-OUT outdoor power supply in order to prevent possible damage to the unit.

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Package Checklist
The MP-620 package includes:
❑One MP-620 Mobility Point (MP)
❑One Category 5 network cable, length 164 ft (50 m)
❑One power injector module and power cord
❑Outdoor pole-mounting bracket kit
❑Installation manual
❑Optional: Two N-type RF coaxial cables
❑Optional: Outdoor wall-mounting bracket kit
❑Optional: Lightning protector for outdoor antenna
The MP-622 package includes:
❑One MP-622 Mobility Point (MP)
❑XPS-6201-OUT or XPS-6202-OUT (packaged in a separate box)
❑Installation manual
❑Optional: Lightning protector for outdoor antenna
The MP-632 package includes:
❑One MP-632 Mobility Point (MP)
❑Mounting brackets and mounting hardware
❑Weather sealing caps for all 6 external antenna connectors
❑Installation manual
❑Separate package for XPS-6201-OUT or XPS-6202-OUT outdoor power supply (orderable option).
❑Circular DIN to RJ45 dongle cable and waterproof caps for RJ45 dongle
❑Two-hole tabular lug for AWG #8 ground cable
❑Antenna connector terminator. Any unused antenna connector on an active radio must be
terminated.
Contact Trapeze Networks if there are any incorrect, missing or damaged parts. If possible, retain
the carton, including the original packing materials. Use them again to repack the product in case
there is a need to return it.

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Installing and Connecting an Outdoor MP
Installation Requirements and Recommendations
For best results, follow these requirements and recommendations before installing an MP-620,
MP-622, or MP-632.
RingMaster Network Plan and Work Orders
If you are using RingMaster to plan your Trapeze Networks Mobility System installation, you might
want to create and verify a network plan for the entire Trapeze network installation and generate an
MP work order, before installing MP access points. A network plan and the MP work orders
generated from it provide the following information about MP access point installation and
configuration:
❑Number of MP access points required for adequate WLAN capacity in each coverage area
❑Detailed installation location for each MP access point
❑Settings for all MP access points in the WLAN
MX Appliance Recommendation
Trapeze Networks recommends that you install and configure the MX before installing an MP. If the
MX is already installed and configured for the MPs, you can immediately verify the cable
connection(s) when you plug the cable(s) into the MP.
Weather Conditions
When planning an MP-620, MP-622, or MP-632 installation, you must take into account any extreme
weather conditions that are known to affect your location. Consider the following factors:
Temperature
Operating an MP in temperatures outside of the supported range may cause the unit to fail.
❑The MP-620 is tested for normal operation in temperatures from -33°C to 55°C.
❑The MP-622 is tested for normal operation in temperatures from -30° to 55 °C (-22° to
131°F).
❑The MP-632 is tested for an ambient operating temperature range of -40°C to +55°C.
Before installing an MP access point, you might need to generate a network plan and
an MP work order with RingMaster. (See RingMaster Network Plan and Work
Orders below.)
MP models MP-620,MP-622 and MP-632 are designed to receive power only from a
Trapeze-provided power injector.

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Wind Velocity
You must consider the known maximum wind velocity and direction at the site and be sure that
any supporting structure, such as a pole, mast, or tower, is built to withstand this force.
❑The MP-620, MP-622, and MP-632 can operate in winds up to 90 MPH and survive higher
wind speeds up to 125 MPH.
Lightning
The MP-620, MP-622, and MP-632 both include built-in lightning protection. However, you should
make sure that the unit, any supporting structure, and cables are all properly grounded. Additional
protection using lightning rods, lightning arrestors, or surge suppressors may also be employed.
Rain
❑The MP-620 and MP-622 units are weatherproofed against rain. Also, prolonged heavy rain
has no significant effect on the radio signal. However, it is recommended to apply
weatherproof sealing tape around the Ethernet port and antenna connectors for extra
protection. If moisture enters a connector, it may cause a degradation in performance.
❑The MP-632 weatherproof enclosure is designed to protect against dust, rain, and water jets.
Snow and Ice
❑Falling snow, like rain, has no significant effect on the radio signal. However, a build up of
snow or ice on antennas may cause a degradation in performance. In this case, the snow or ice
has to be cleared from the antennas to restore proper operation of the unit.
Ethernet Cabling
When you have determined a suitable location for the MP-620, MP-622, or MP-632, you must plan a
cable route from the MP outdoors to the power injector module indoors. Consider these points:
❑The Ethernet cable length should never be longer than 328 ft (100 m) over CAT5, CAT5e, or CAT6
cable.
❑Determine a building entry point for the cable.
❑Determine if conduits, bracing, or other structures are required for safety or protection of the cable.
❑For lightning protection at the power injector end of the cable, consider using a lightning arrestor
immediately before the cable enters the building.
Grounding
MP-620, MP-622, and MP-632
❑It is important that the MP-620, MP-622 and MP-632 units, cables, lightning arrestors, and any
supporting structures are properly grounded. The MP-620 and MP-622 units include a grounding
screw for attaching a ground wire. Be sure that grounding is available and that it meets local and
national electrical codes. The MP-632 includes two grounding screws and a tubular lug for
attaching a crimped ground wire.
See the Outdoor Power Supply Installation Guide for details on installing the power
supply for the MP-620.

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MP Radio Safety Advisories
When you enable the MP radio(s) as part of MX configuration, the radios are able to receive and
transmit radio frequency energy as soon as you connect the MP to the MX, either directly or through
the network.
Radio Frequency Exposure
Federal Communications Commission (FCC) Docket 96-8 for Spread Spectrum Transmitters specifies
a safety standard for human exposure to radio frequency electromagnetic energy emitted by
FCC-certified equipment. When used with the proper antennas (shipped in the product), Trapeze
Networks MP access point products meet the uncontrolled environmental limits found in OET-65 and
ANSI C95.1-1991. Proper installation of the MP access point according to the instructions in this
manual will result in user exposure that is below the FCC recommended limits.
Additional Radio Safety Advisories
For additional radio safety warnings, the Regulatory Guide document.
Installing an MP-620
The MP-620 includes a bracket kit for mounting the unit to a 1.5 to 2 inch diameter steel pole or tube.
The pole-mounting bracket allows the unit to be mounted to part of a radio mast or tower structure.
The unit also has a wall-mounting bracket kit that enables it to be installed on a building wall or roof
when using external antennas.
Hardware installation of the MP-620 involves these steps:
1. Mount the unit on a wall, pole, mast, or tower using the mounting bracket.
2. Mount external antennas on the same supporting structure as the MP-620 and connect them to
the unit.
3. Connect the Ethernet cable and a grounding wire to the unit.
4. Connect the power injector to the Ethernet cable, a local LAN switch, and an AC power source.
5. For wireless bridge or Mesh Services installations, align antennas at the bridge or mesh link
endpoints.
Mounting the Unit
You can mount the MP-620 using either the pole-mounting bracket or the wall-mounting bracket. Use
one of the following procedures.
Using the Pole-Mounting Bracket
Perform the following steps to mount the unit to a 1.5 to 2 inch diameter steel pole or tube using the
mounting bracket:
1. Always attach the bracket to a pole with the open end of the mounting grooves facing up.
If you are installing the MP-620 as a Mesh AP in a WLAN Mesh or wireless bridge
configuration, and the MP will not have a wired link to an MX , you must configure
the MP connection using a wired link to an MX switch before deploying the MP-620
in a final location.
See the Mobility System Software Configuration Guide for information about
configuring WLAN Mesh Services and wireless bridging.

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2. Place the U-shaped part of the bracket around the pole and tighten the securing nut just enough
to hold the bracket to the pole. (The bracket may need to be rotated around the pole during the
alignment process.)
Figure 1–1. Attaching the Bracket to the Pole
3. Use the included nuts to tightly secure the MP-620 to the bracket.
Mounting on Larger Diameter Poles
In addition, there is a method for attaching the pole-mounting bracket to a pole that is 2 to 5 inches in
diameter using an adjustable steel band strap (not included in the kit). A steel band strap up to 0.5
inch (1.27 cm) wide can be threaded through the main part of the bracket to secure it to a larger
diameter pole without using the U-shaped part of the bracket. This method is illustrated in the
following figure.
Figure 1–2. Attaching the Bracket Using a Steel Band Strap
Using the Wall-Mounting Bracket
Perform the following steps to mount the unit to a wall using the wall-mounting bracket:
1. Always attach the bracket to a wall with the open end of the mounting grooves facing up (see
following figure).
A
ttach bracket to
pole with mounting
grooves facing up
Steel Band Clamp

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Figure 1–3. Wall-Mounting Bracket
2. Position the bracket in the intended location and mark the position of the three mounting screw
holes.
3. Drill three holes in the wall that match the screws and wall plugs included in the bracket kit, then
secure the bracket to the wall.
4. Use the included nuts to tightly secure the MP-620 to the bracket.
Connecting External Antennas
When deploying an MP-620, you must mount external antennas and connect them to the unit.
Typically, access point operation requires a 2.4 GHz antenna, and bridge link operation requires a
5 GHz antenna.
Perform these steps:
1. Mount the external antenna to the same supporting structure as the MP-620, within 10 ft (3 m)
distance, using the bracket supplied in the antenna package.
2. If you are installing the optional lightning arrestor for an outdoor antenna, perform the following
steps. Otherwise, skip to step 3.
a. Solder the ground wire to the ground-wire terminal lug supplied with the lightning arrestor.
Trapeze Networks recommends that you use 6-gauge cable for the ground wire. The ground
wire must be properly earthed in order to provide adequate protection.
b. Attach the ground-wire terminal lug, lock washer, and hex nut to the lightning arrestor, in the
order shown in Figure 1–4 below.
To meet regulatory requirements, you must ensure that the external antenna specified
with the set ap radio antennatype command exactly matches the external antenna
attached to the MP-620 external antenna port.
Mounting Grooves

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Figure 1–4. Attaching the Ground-Wire Terminal Lug, Lock Washer, and Hex Nut to the Lightning Arrestor
c. Connect one end of the short RF coaxial cable to the MP-620 N-type connector, and connect the
other end to the lightning arrestor.
d. Connect one end of the 3m RF coaxial cable to the lightning arrestor, and connect the other end
to the outdoor antenna. Continue with step 4.
3. Connect the antenna to the MP-620 N-type connector using the RF coaxial cable provided in the
antenna package.
4. Apply weatherproofing tape to the antenna connectors to help prevent water entering the
connectors.

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Figure 1–5. Connecting External Antennas to the MP-620
Connecting Cables to the Unit
1. Attach the Ethernet cable to the Ethernet port on the MP-620.
2. For extra protection against rain or moisture, apply weatherproofing tape (not included) around
the Ethernet connector.
3. Be sure to ground the unit with an appropriate grounding wire (not included) by attaching it to
the grounding screw on the unit.
The Ethernet cable included with the package is 30 m (100 ft) long. To wire a longer
cable (maximum 100 m, 325 ft), use the connector pinout information in Appendix B.
Be sure that grounding is available and that it meets local and national electrical
codes. For additional lightning protection, use lightning rods, lightning arrestors, or
surge suppressors.

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Figure 1–6. Attaching an Ethernet Cable to the MP-620
Connecting the Outdoor Power Supply
For instructions on connecting the outdoor power supply to the MP-620, refer to the Outdoor Power
Supply Installation Guide. Be sure to contact a fully qualified electrician to perform the installation.
Connecting an MP to an MX
You can connect an MP directly to an MX or indirectly to the MX through an intermediate Layer 2 or
Layer 3 network. If you are connecting the MP directly to an MX, use the following procedure to
insert the cable into the MX and verify the link.
You can use the CLI or RingMaster to configure an MP connection. If you are installing the MP-620
as a Mesh AP in a WLAN Mesh or wireless bridge configuration, you must configure the MP
connection before deploying the MP-620 in its final location. (See the Mobility System Software
Configuration Guide.)
Figure 1–7 shows how to insert a Cat 5 cable into 10/100 Ethernet port on an MX. Refer to this figure
as you perform the procedure.
Figure 1–7. 10/100 Cat 5 Cable Installation

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1. Insert a Cat 5 cable with a standard RJ-45 connector as shown in Figure 1–7. For connection to an
MP, use a straight-through cable.
2. When the link is activated, observe the MP LED for the port on the MX:
Aligning Antennas for Bridge or Mesh Links
If you are installing MP-620 units for wireless bridge or Mesh Services operation, after the units have
been mounted, connected, and the radios are operating, the antennas must be accurately aligned to
ensure optimum performance on the bridge or mesh links.
This alignment process is particularly important for long-range point-to-point links. In a
point-to-multipoint configuration, the Mesh Portal AP uses an omnidirectional or sector antenna,
which does not require alignment, but Mesh APs still need to be correctly aligned with the Mesh
Portal antennna.
❑Point-to-Point Configurations – In a point-to-point configuration, the alignment process
requires two people at each end of the link. The use of cell phones or two-way radio communication
may help with coordination. To start, you can just point the antennas at each other, using
binoculars or a compass to set the general direction. For accurate alignment, you must connect a
DC voltmeter or RSSI meter to the BNC connector on the MP-620 and monitor the voltage as the
antenna moves horizontally and vertically.
❑Point-to-Multipoint Configurations – In a point-to-multipoint configuration all Mesh APs must
be aligned with the Mesh Portal antenna. The alignment process is the same as for point-to-point
links, but only the Mesh AP end of the link requires the alignment.
The MP-620 BNC connector provides an output voltage between 0 and 3.28 VDC that is proportional
to the received radio signal strength. The higher the voltage reading, the stronger the signal. The
radio signal from the remote antenna can be seen to have a strong central main lobe and smaller side
lobes. The object of the alignment process is to set the antenna so that it is receiving the strongest
signal from the central main lobe.
MX Port LEDs for MP
Connections Meaning
Solid green For an MP access point active link, all the following are true:
❑MP has booted.
❑MP has received a valid configuration from the MX switch.
❑Management link with an MP is operational.
❑At least one radio is enabled or is in sentry mode.
For an MP secondary link, the link is present.
Alternating green and
amber
MP is booting with an image received from the MX switch. After the access
point boots and receives its configuration, this LED appearance persists
until a radio is enabled or is placed in sentry mode.
Solid amber PoE is on.
Blinking amber MP is unresponsive or there is a PoE problem.
Unlit PoE is off.
An MX switch 10/100 Ethernet ports are configured as wired network ports by
default. You must change the port type for an MX port directly connected to an MP to
activate the link. (See the Mobility Exchange Installation and Basic Configuration
Guide.)

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Figure 1–8. Aligning the MP-620 Antenna According to Signal Strength
To align the antennas in the link using the output voltage, start with one antenna fixed and then
perform the following procedure to align the other antenna:
1. Optionally configure the MP with the fixed antenna to send link calibration packets.
A link calibration packet is an unencrypted 802.11 management packet of type Action. When
enabled on an MP radio, link calibration packets are sent at a rate of 5 per second. When the
MP-620 receives a link calibration packet, it emits a voltage to the RSSI meter proportional to the
received signal strength of the packet. This can aid in positioning the MP-620 where it has a
strong signal to the MP sending out the packets.
To configure an MP radio to send out link calibration packets, use the following command on the
MX:
set ap num radio num link-calibration mode {enable | disable}
Only one radio on an MP can be configured to send link calibration packets. Link calibration
packets are intended to be used only during installation of MPs and not on a continual basis.
2. On the MP-620, remove the BNC connector cover and connect a DC voltmeter or RSSI meter using
a cable with a male BNC connector (not included).
Main Lobe
Maximum
Horizontal Scan
Vertical Scan
RSSI
Voltage Side Lobe
Maximum
RSSI Voltage
Remote
Antenna
Maximum Signal Strength Position
for Horizontal Alignment
Maximum Signal
Strength Position for
Vertical Alignment

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Figure 1–9. Connecting a Voltmeter to the MP-620
3. Pan the antenna horizontally back and forth while checking the RSSI voltage. If using the
pole-mounting bracket with the MP-620, you must rotate the mounting bracket around the pole.
Other external antenna brackets may require a different horizontal adjustment.
4. Find the point where the signal is strongest (highest voltage) and secure the horizontal
adjustment in that position.
5. Loosen the vertical adjustment on the mounting bracket and tilt the antenna slowly up and down
while checking the RSSI voltage.
6. Find the point where the signal is strongest and secure the vertical adjustment in that position.
7. Remove the voltmeter cable and replace the connector cover.
Sometimes there may not be a central lobe peak in the voltage because vertical
alignment is too far off and only two similar peaks for the side lobes are detected. In
this case, fix the antenna so that it is halfway between the two peaks.
Voltmeter
RSSI BNC
Connection

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Installing an MP-622
The MP-622 includes a bracket kit for mounting the unit to a 1.5 to 2 inch diameter steel pole or tube.
The pole-mounting bracket allows the unit to be mounted to part of a radio mast or tower structure.
The unit also has a wall-mounting bracket kit that enables it to be installed on a building wall or roof
when using external antennas.
Hardware installation of the MP-622 involves these steps:
1. Mount the unit on a wall, pole, mast, or tower using the mounting bracket.
2. Mount external antennas on the same supporting structure as the MP-622 and connect them to
the unit.
3. Connect the Ethernet cable and a grounding wire to the unit.
4. Connect the power injector to the Ethernet cable, a local LAN switch, and an AC power source.
5. For wireless bridge or Mesh Services installations, align antennas at the bridge or mesh link
endpoints.
Mounting the Unit
You can mount the MP-622 using either the pole-mounting bracket or the wall-mounting bracket. Use
one of the following procedures.
Using the Pole-Mounting Bracket
Perform the following steps to mount the unit to a 1.5 to 2 inch diameter steel pole or tube using the
mounting bracket:
If you are installing the MP-622 as a Mesh AP in a WLAN Mesh or wireless bridge
configuration, the MP does not have a wired link to an MX. You must configure the
MP connection using a wired link to an MX before deploying the MP-622 in a final
location.
See the Mobility System Software Configuration Guide for information about
configuring WLAN Mesh Services and wireless bridging.
Always attach the bracket to a pole with the open end of the mounting grooves facing
up.

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1. Place the V-shaped part of the bracket around the pole and tighten the securing nuts just enough
to hold the bracket to the pole. (The bracket may need to be rotated around the pole during the
alignment process.)
Figure 1–10. Attaching the Bracket to the Pole
2. Fit the edges of the V-shaped part into the slots in the rectangular plate, and use the included
nuts to tightly secure the MP-622 to the bracket.

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3. Attach the adjustable rectangular plate to the bridge with supplied screws.
4. Attach the bridge with bracket to the plate already fixed to the pole.
5. Use the included nuts to secure the wireless bridge to the pole bracket. Note that the wireless
bridge tilt angle may need to be adjusted during the antenna alignment process. Be sure to take
account of the antenna polarization direction. All antennas in a link must be mounted with the
same polarization.