Dell PowerConnect W-AP175 Bedienungsanleitung

Dell PowerConnect W-AP175 Outdoor Access Point

Installation Guide

0511047-01 | January 2012 1

The Dell PowerConnect W-AP175 is a resilient, environmentally hardened, outdoor rated, dual-radio, dual-band

IEEE 802.11 a/b/g/n wireless access point. This outdoor access point is part of Dell’s comprehensive wireless

network solution. The W-AP175 works only in conjunction with an Dell PowerConnect W-Series controller and

each AP can be centrally managed, configured, and upgraded through the controller.

There are three versions of the W-AP175, which mainly differ in the way they receive power.

W-AP175P: PoE+ powered (802.3at)

W-AP175AC: AC powered (100-240 V AC)

W-AP175DC: DC powered (12-48 V DC)

Guide Overview

“W-AP175 Hardware Overview” on page3provides a detailed hardware overview of the three W-AP175

models.

“Outdoor Planning and Deployment Considerations” on page7provides key questions to ask and items to

consider when deploying an outdoor wireless network.

“Installing Antennas” on page11 describes how to installing antennas.

“Weatherproofing Connections” on page12 provides instructions on weatherproofing the AP’s connectors.

“Installing the W-AP175” on page20 describes the multi-step process for a successful installation and

deployment of an W-AP175.

“Safety and Regulatory Compliance” on page30 provides an overview of safety and regulatory compliance

information.

W-AP175 Operations

Wireless access point (IEEE 802.11 a/b/g/n)

Wireless air monitor (IEEE 802.11 a/b/g/n)

Enterprise mesh point

Enterprise mesh portal

Protocol-independent networking functionality

W-AP175P: IEEE 802.3at Power over Ethernet+ (PoE+) compatible

W-AP175AC and W-AP175DC: IEEE 802.3af Power Sourcing Equipment (PSE) device

NOTE: The W-AP175P requires ArubaOS 5.0.2.1 or later. The W-AP175AC and W-AP175DC require ArubaOS 6.1.2.3 or later.

NOTE: The W-AP175AC/DC can function as a Power Sourcing Equipment (PSE) device by providing power through its ethernet

port in compliance with the IEEE 802.3af standard.

2Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide

Package Contents

W-AP175 Access Point

W-AP175 Mounting Bracket

Solar Shield

Pole Anchors x 2

M4 x 16 bolts, flat washers, and spring washers x4 (These bolts are attached to the solar shield)

M6 x 30 bolts, flat washers, and spring washers x2

M4 x 12 bolt, external-tooth washer, and OT copper lug x1

M8 x 110 bolt, flat washers, spring washers, and nuts x4

Metal Weatherproof Caps x2 for use on unused antenna interfaces

RJ-45 Connector Kit with plastic RJ-45 connector (W-AP175P only)

RJ-45 Connector Kit with metal RJ-45 connector (W-AP175AC/DC only)

USB Console Cable

Installation Guide

NOTE: Inform your supplier if there are any incorrect, missing, or damaged parts. If possible, retain the carton, including the

original packing materials. Use these materials to repack and return the unit to the supplier if needed.

Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide 3

W-AP175 Hardware Overview

The following section describes the hardware features of the W-AP175.

Figure 1

W-AP175 Overview (W-AP175P shown)

Antenna Interface

The W-AP175 requires the use of detachable outdoor-rated antennas. Select the correct antenna type to support

the required frequency band (2.4 or 5 GHz) and the desired coverage pattern.

The W-AP175 is equipped with four, female N-type antenna interfaces; two on the top of the AP and two on the

bottom. The interfaces are grouped into diversity pairs, one pair is marked R0 (Radio 0) and the other pair

marked as R1 (Radio 1). R0 supports the 5 GHz frequency band and R1 supports the 2.4 GHz radio band.

1 Antenna Interface (Radio 1) 5 Antenna Interface (Radio 0)

2 USB Console Interface 6 Antenna Interface (Radio 1)

3 Reserved (W-AP175P) or

Power Interface (W-AP175AC and W-AP175DC)

7 Ethernet Interface (PoE)

4 Antenna Interface (Radio 0) 8 Grounding Point

4Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide

USB Console Interface

A USB serial console port is provided for connection to a terminal, allowing direct local management. Use the

included USB console cable to connect to the AP. You can download the necessary driver for USB-UART adapter

from download.dell-pcw.com under Tools & Resources.

Use the following setting to access the terminal:

Power Interface

The type of power interface on your W-AP175 depends on which model you have purchased.

W-AP175P: This version does not include a power interface since it is only powered by PoE+ (802.3at).

W-AP175AC: 1x AC power connector

W-AP175DC: 1x DC power connector

Ethernet Interface

The W-AP175 is equipped with a 10/100/1000Base-T Gigabit Ethernet port for wired network connectivity. On

the W-AP175P, this port also supports IEEE 802.3at Power over Ethernet (PoE), accepting 48 VDC as a

standards-defined powered device (PD) from a power sourcing equipment (PSE) device, such as a PoE midspan

injector. Inversely, the W-AP175AC and W-AP175DC can act as a PSE device to provide IEEE802.3af PoE

power to devices connected to the ethernet port.

Grounding Point

Always remember to protect your W-AP175 by installing grounding lines. The ground connection must be

complete before connecting power to the W-AP175 enclosure. Ensure that the resistance is less than 5 ohm

between the ground termination point and the grounding tier.

Table 1

Console Settings

Baud Rate Data Bits Parity Stop Bits Flow Control

9600 8 None 1 None

CAUTION: Do not connect a DC power cable to an W-AP175AC or an AC power cable to a W-AP175DC.

CAUTION:

For the W-AP175AC, only use the AC power cord with model number CBL-AC-INTL.

For the W-AP175DC, only use DC power cord with model number CBL-DC-WW.

Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide 5

W-AP175P LED Status Indicators

The W-AP175 include visual indicators for power, link, and radio status. Additionally, each radio has a four-LED

array that indicates received signal strength (RSSI).

Figure 2

LED Layout

Table 2 lists the meanings of the LEDs on the W-AP175P outdoor access point.

NOTE: The RSSI LED indicators represent varying degrees in the RSSI level. The absence of a signal is indicated by no LED

response, and full signal strength is indicated when all four LEDs are active and lit.

Table 2

W-AP175P LED Status Indicators

LED Function Indicator Status

P/S AP Power/Ready

Status Off No power to AP

Blinking Device booting, not ready

On Device ready

POE N/A N/A Not currently used

ENT LAN/Network Link

Status Off Ethernet link unavailable

On (Amber) 10/100 Mbs ethernet link negotiated

On (Green) 1000 Mbs ethernet link negotiated

Blinking Traffic on ethernet link

R0 Radio 0 Status Off Radio 0 disabled

On (Amber) Radio 0 enabled in WLAN mode

Blinking Air Monitor (AM) mode

R1 Radio 1 Status Off Radio 1disabled

On (Blue) Radio 1 enabled in WLAN mode

Blinking Air Monitor (AM) mode

RSSI (Radio 0) RSSI Level for Radio 0 Off RSSI disabled/no signal

4 Step Progressive Bars

(Red)

25/50/75/100%

Each bar represents a progressive increase in

signal strength, with 4 bars representing

maximum signal strength (100%).

Minimum data rate: One lit LEDs

Maximum data rate: Four lit LEDs

P/S ENT

POE

RSSI for Radio 1

RSSI for Radio 0

6Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide

W-AP175AC/DC LED Status Indicators

The W-AP175 include visual indicators for power, link, heat and radio status. Additionally, each radio has a four-

LED array that indicates received signal strength (RSSI).

Figure 3

LED Layout

Table 3 lists the meanings of the LEDs on the W-AP175AC/DC outdoor access points.

RSSI (Radio 1) RSSI Level for Radio 1 Off RSSI disabled/no signal

4 Step Progressive Bars

(Blue)

25/50/75/100%

Each bar represents a progressive increase in

signal strength, with 4 bars representing

maximum signal strength (100%).

Minimum data rate: One lit LEDs

Maximum data rate: Four lit LEDs

Table 2

W-AP175P LED Status Indicators (Continued)

LED Function Indicator Status

NOTE: The RSSI LED indicators represent varying degrees in the RSSI level. The absence of a signal is indicated by no LED

response, and full signal strength is indicated when all four LEDs are active and lit.

Table 3

W-AP175AC/DC LED Status Indicators

LED Function Indicator Status

P/S AP Power/Ready

Status Off No power to AP

Blinking Device booting, not ready

On Device ready

POE Displays PSE power

output status Off Non-powered device (0Ω<Rport<200Ω) or Port

open (Rport>1MΩ)

Green Port on (25kΩ)

1 Flash: Low signature resistance

(300Ω<Rport<15kΩ)

2 Flashes: High signature resistance

(33kΩ<Rport<500kΩ)

5 Flashes: Port overload fault

9 Flashes: Power management allocation

exceeded

Heat Displays the heating

status of low

temperature

Off Unit is not in heating status

Blinking (Blue) Unit is pre-heating

P/S ENT

POE HEAT

RSSI for Radio 1

RSSI for Radio 0

Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide 7

Outdoor Planning and Deployment Considerations

Prior to deploying an outdoor wireless network, the environment must be evaluated to plan for a successful Dell

WLAN deployment. Successfully evaluating the environment enables the proper selection of Dell APs and

antennas and assists in the determination of their placement for optimal RF coverage. This process is considered

WLAN or RF planning.

Scale Requirements

The potentially immense scale of outdoor deployments requires consideration of factors that may not be as

important in a typical indoor deployment:

Range (distance): Range or distance between APs must be taken into account during the planning phase.

Available AP mounting locations are often far less flexible in an outdoor environment. Regardless of these

outdoor restrictions, the desired goal is to achieve results similar to an indoor deployment: a “dense” RF

deployment that supports advanced Aruba features, such as ARM, efficient client roaming, and failover.

Elevation: Proper consideration and planning for elevation differences between APs (AP to AP) and AP to

Client can be critical to success. To plan for these differences in elevation, it is important to understand the

3D coverage pattern provided by the antennas that will be deployed in the environment.

Non-Fixed Considerations: The RF environment might change on a day to day basis. Keep non-fixed items,

such as shipping containers, vehicles, and future building construction, in mind when planning for an outdoor

deployment.

ENT LAN/Network Link

Status Off Ethernet link unavailable

On (Amber) 10/100 Mbs ethernet link negotiated

On (Green) 1000 Mbs ethernet link negotiated

Blinking Traffic on ethernet link

R0 Radio 0 Status Off Radio 0 disabled

On (Amber) Radio 0 enabled in WLAN mode

Blinking Air Monitor (AM) mode

R1 Radio 1 Status Off Radio 1disabled

On (Blue) Radio 1 enabled in WLAN mode

Blinking Air Monitor (AM) mode

RSSI (Radio 0) RSSI Level for Radio 0 Off RSSI disabled/no signal

4 Step Progressive Bars

(Red)

25/50/75/100%

Each bar represents a progressive increase in

signal strength, with 4 bars representing maximum

signal strength (100%).

Minimum data rate: One lit LEDs

Maximum data rate: Four lit LEDs

RSSI (Radio 1) RSSI Level for Radio 1 Off RSSI disabled/no signal

4 Step Progressive Bars

(Blue)

25/50/75/100%

Each bar represents a progressive increase in

signal strength, with 4 bars representing maximum

signal strength (100%).

Minimum data rate: One lit LEDs

Maximum data rate: Four lit LEDs

Table 3

W-AP175AC/DC LED Status Indicators (Continued)

LED Function Indicator Status

8Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide

Identifying Known RF Absorbers/Reflectors/Interferences Sources

Identifying known RF absorbers/reflectors/interference sources while out in the field during the installation phase

is critical. Even though outdoor environments consist of fewer RF absorbers/reflectors/interference sources

compared to indoor environments, ensure that these sources are identified and taken into consideration when

installing and mounting an AP to its fixed outdoor location.

RF Absorbers

Cement/Concrete

Natural Items: Trees/vegetation

Brick

RF Reflectors

Metal Objects: Roof-installed air-conditioning equipment, chain link fences (depending on aperture size),

other wire fences, or water pipes

RF Interference Sources

Other 802.11a/b/g/n or broadband access equipment operating nearby

Industrial RF welding equipment or other Industrial, Scientific and Medical (ISM) equipment that utilizes

RF to heat or alter the physical properties of materials

Military, Commercial Aviation or Weather Radar Systems

Line of Sight (Radio Path Planning)

A wireless bridge or mesh link requires a “radio line of sight” between the two antennas for optimum

performance. The concept of radio line of sight involves the area along a link through which the bulk of the radio

signal power travels. This area is known as the first Fresnel Zone of the radio link. For a radio link, no object

(including the ground) must intrude within 60% of the first Fresnel Zone.

Figure 4 illustrates the concept of a good radio line of sight.

Figure 4

Line of Sight

If there are obstacles in the radio path, there may still be a radio link but the quality and strength of the signal will

be affected. Calculating the maximum clearance from objects on a path is important as it directly affects the

decision on antenna placement and height. It is especially critical for long-distance links, where the radio signal

could easily be lost.

When planning the radio path for a wireless bridge or mesh link, consider these factors:

Avoid any partial line of sight between the antennas

Be cautious of trees or other foliage that may be near the path, or may grow and obstruct the path.

Radio Line of Sight

Visual Line of Sight

Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide 9

Be sure there is enough clearance from buildings and that no building construction may eventually block the

path.

For very long distance links, the curvature of the earth (20 cm per km) may need to be considered in the

calculation of relative heights.

Check the topology of the land between the antennas using topographical maps, aerial photos, or even

satellite image data (software packages are available that may include this information for your area)

Avoid a path that may incur temporary blockage due to the movement of cars, trains, or aircraft.

Antenna Height

A reliable wireless bridge or mesh link is usually best achieved by mounting the antennas at each end high enough

for a clear radio line of sight between them. The minimum height required depends on the distance of the link,

obstacles that may be in the path, topology of the terrain, and the curvature of the earth (for links over 3 miles).

For long-distance links, the AP may have to be mounted on masts or poles that are tall enough to attain the

minimum required clearance. Use the following table to estimate the required minimum clearance above the

ground or path obstruction (for 5 GHz bridge links).

Table 4

Antenna Minimum Height and Clearance Requirements

Total Link Distance Max Clearance for

60% of First Fresnel

Zone at 5.8 GHz

Approximate Clearance

for Earth Curvature

Total Clearance

Required at

Mid-point of Link

0.25 mile (0.402 km) 4.6 ft (1.4 m) 0.007 ft (0.002 m) 4.6 ft (1.4 m)

0.5 mile (0.805 km) 6.2 ft (1.9 m) 0.03 ft (0.010 m) 6.2 ft (1.9 m)

1 mile (1.6 km) 8.9 ft (2.7 m) 0.13 ft (0.04 m) 8.9 ft (2.7 m)

2 miles (3.2 km) 12.5 ft (3.8 m) 0.5 ft (0.15 m) 13.1 ft (4.0 m)

3 miles (4.8 km) 15.4 ft (4.7 m) 1.0 ft (0.3 m) 16.4 ft (5.0 m)

4 miles (6.4 km) 17.7 ft (5.4 m) 2.0 ft (0.6 m) 19.7 ft (6.0 m)

5 miles (8 km) 20 ft (6.1 m) 3.0 ft (0.9 m) 23 ft (7.0 m)

7 miles (11.3 km) 23.6 ft (7.2 m) 6.2 ft (1.9 m) 30 ft (9.1 m)

9 miles (14.5 km) 27 ft (8.2 m) 10.2 ft (3.1 m) 37 ft (11.3 m)

12 miles (19.3 km) 30.8 ft (9.4 m) 18.0 ft (5.5 m) 49 ft (14.9 m)

15 miles (24.1 km) 34.4 ft (10.5 m) 28.0 ft (8.5 m) 62.7 ft (19.1 m)

NOTE: To avoid any obstruction along the path, the height of the object must be added to the minimum clearance required for a

clear radio line of sight. Consider the following simple example, illustrated in Figure 5.

10 Dell PowerConnect W-AP175 Outdoor Access Point | Installation Guide

Figure 5

Antenna Height and Line of Sight

A wireless bridge or mesh link is deployed to connect building A to building B, which is located three miles (4.8

km) away. Mid-way between the two buildings is a small tree-covered hill. From the above table it can be seen

that for a three-mile link, the object clearance required at the mid-point is 5.3 m (17.4 ft). The tree tops on the

hill are at an elevation of 17 m (56 ft), so the antennas at each end of the link need to be at least 22.3 m (73 ft)

high. Building A is six stories high, or 20 m (66 ft), so a 2.3 m (7.5 ft) mast or pole must be constructed on its roof

to achieve the required antenna height. Building B is only three stories high, or 9 m (30 ft), but is located at an

elevation that is 12 m (39 ft) higher than building A. To mount an antenna at the required height on building B,

a mast or pole of 1.3 m (4.3 ft) is needed.

Antenna Position and Orientation

Once the required antenna height has been determined, other factors affecting the precise position of the wireless

bridge or mesh link must be considered:

Be sure there are no other radio antennas within 2 m (6 ft) of the wireless bridge or mesh link. These include

other WiFi radio antennas.

Place the wireless bridge or mesh link away from power and telephone lines.

Avoid placing the wireless bridge or mesh link too close to any metallic reflective surfaces, such as roof-

installed air-conditioning equipment, tinted windows, wire fences, or water pipes. Ensure that there is at least

5 feet clearance from such objects.

The wireless bridge or mesh link antennas at both ends of the link must be positioned with the same

polarization direction, either horizontal or vertical. Proper alignment helps to maximize throughput.

Radio Interference

The avoidance of radio interference is an important part of wireless link planning. Interference is caused by other

radio transmissions using the same or an adjacent channel frequency. You should first scan your proposed site

using a spectrum analyzer to determine if there are any strong radio signals using the 802.11a/b/g channel

frequencies. Always use a channel frequency that is furthest away from another signal.

If radio interference is still a problem with your wireless bridge or mesh link, changing the antenna direction may

improve the situation.

3 miles (4.8 km)

5.4 m

17 m

20 m

2.4 m

12 m

1.4 m

Radio Line of Sight

Visual Line of Sight

CAUTION: Never construct a radio mast, pole, or tower near overhead power lines.

NOTE: Local regulations may limit or prevent construction of a high radio mast or tower. If your wireless bridge or mesh link

requires a high radio mast or tower, consult a professional contractor for advice.

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