HP ProCurve Wireless 170wl Manuale utente

HP ProCurve Wireless 170wl

Radio Card External Antenna

User’s Guide

Hewlett-Packard Company

8000 Foothills Boulevard, m/s 5552

Roseville, California 95747-5552

http://www.hp.com/go/hpprocurve

L.P. The information contained herein is subject to change

without notice.

This document contains proprietary information, which is

protected by copyright. No part of this document may be

photocopied, reproduced, or translated into another

language without the prior written consent of

Hewlett-Packard.

Publication Number

5990-6069

May 2004

Applicable Products

HP ProCurve 5 dBi indoor/outdoor omnidirctional

antenna (J8441A)

HP ProCurve 7 dBi indoor/outdoor directional

antenna (J8443A)

HP ProCurve 8 dBi outdoor omnidirctional

antenna (J8444A)

HP ProCurve 11 dBi indoor/outdoor wide angle

directional antenna (J8446A)

HP ProCurve MC-Card to R-SMA cable (J8447A)

HP ProCurve 14 dBi yagi antenna (J8448A)

HP ProCurve Wireless AP 520wl (J8133A)

HP ProCurve 802.11g 170wl Card (J8430A)

HP ProCurve 802.11g 170wl Card (J8431A)

HP ProCurve 802.11g 170wl Card (J8432A)

Disclaimer

HEWLETT-PACKARD COMPANY MAKES NO WARRANTY

OF ANY KIND WITH REGARD TO THIS MATERIAL,

INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not

be liable for errors contained herein or for incidental or

consequential damages in connection with the furnishing,

performance, or use of this material.

The only warranties for HP products and services are set

forth in the express warranty statements accompanying

such products and services. Nothing herein should be

construed as constituting an additional warranty. HP shall

not be liable for technical or editorial errors or omissions

contained herein.

Hewlett-Packard assumes no responsibility for the use or

reliability of its software on equipment that is not furnished

by Hewlett-Packard.

Warranty

See the Customer Support/Warranty booklet included with

the product.

A copy of the specific warranty terms applicable to your

Hewlett-Packard products and replacement parts can be

obtained from your HP Sales and Service Office or

authorized dealer.

Using an External Antenna with the 170wl

Radio Card

HP provides a variety of external antenna options for extending the radio

range and shaping the coverge area of your access point by connecting

antennas to your HP ProCurve 802.11g 170wl radio card . These antennas offer

a number of different mounting locations, including indoor or outdoor, wall,

ceiling, or radio mast.

This guide shows you how to install an external antenna for your 170wl radio

card.

Professional

Installation

Required

Only the HP antennas listed in this guide are permitted to be connected to the

170wl radio card. You must use the appropriate antennas, cables, and where

applicable, surge arrestors, for your given region. You are responsible for

verifying local regulations or legislation that may impose restrictions on the

use of specific antenna and cable combinations. For this reason, HP recom-

mends that you consult with a professional installer who is trained in RF

installation and knowledgeable in the local regulations prior to connecting an

external antenna to your wireless radio product. It is the responsibility of the

end user to ensure the antenna installation complies with the local radio

regulations.

Using an External Antenna with the 170wl Radio Card

External Antenna Options

The 170wl radio card external antenna options are outlined in the following

table:

Table 1. Summary of External Antennas to Use With the 170wl radio card

Antenna Type Part Number Mounting Horizontal

Beamwidth (3dB)

Vertical

Beamwidth (3dB)

5 dBi indoor/outdoor

omnidirectional

J8441A Ceiling or mast 360 Degrees 31 Degrees

7 dBi indoor/outdoor directional J8443A Flush wall mount

withintegrated

articulating feature

65 Degrees 50 Degrees

8 dBi outdoor omnidirectional J8444A* Mast 360 Degrees 12 Degrees

11 dBi indoor/outdoor wideangle

directional

J8446A* Flush wall mount, tilt

mount for mast

120 Degrees 13 Degrees

MC-Card to R-SMA cable

Thiscable must be used with all the

above antennas

J8447A n/a n/a n/a

14 dBi yagi

Comes with it’s own adapter cable

J8448A* Articulating wall or

mast

34 Degrees 30 Degrees

* These antennas are not permitted for use in North America.

Using an External Antenna with the 170wl Radio Card

Pre-Installation Considerations

Planning the Installation

To determine the best location of your wireless access points and antennas,

we recommend conducting a site survey before placing the devices in their

final locations. For information on how to conduct a site survey, contact your

local reseller.

WARNING Never install an antenna or construct a radio mast near overhead

powerlines.

Caution Never mount the access point outdoors to be near an external antenna. The

access point must always be installed indoors.

■Installation Location - Plan the antenna’s position and orientation.

Consider these points:

• Use the antenna’s mounting bracket or other hardware, if included.

• For optimum performance, mount antennas as high as possible above

any obstructions, and away from any signal absorbing or reflecting

structures (such as those containing metal).

• Be sure there are no other radio antennas mounted within 2 m (6 ft).

• Consider the antenna’s radio coverage pattern so that it can properly

cover the intended service area and not interfere with other radios

and antennas.

• Because most antenna pigtail cables are a relatively short length, be

sure to find a suitable mounting position for the antenna that is not

too far from the access point. Alternatively, you may need to relocate

the access point to achieve the desired coverage area for the antenna.

Use an extension cable to span excessive distance between the

antenna and the access point.

■Omnidirectional Antennas - Consider these factors when selecting a

location for these antennas:

• Always mount the antenna in a vertical orientation so that the radio

coverage pattern fills the intended horizontal space.

Using an External Antenna with the 170wl Radio Card

Pre-Installation Considerations

• For optimum coverage, mount the antenna at the center of the area

with a line-of-sight path to all points within the area.

• Avoid mounting next to or near building support columns or other

obstructions that may cause reduced signal or null zones in parts of

the coverage area.

• When mounting outdoors using a mast, make sure the antenna

extends beyond the top of the mast.

■Directional Antennas - Consider these factors when selecting a location

for these antennas:

• For optimum coverage, mount the antenna above any obstructions,

directed at the center of the coverage area sector.

• High-gain directional antennas provide a flattened radio coverage

pattern in the horizontal plane. Use the tilting or articulated mounts

to point the antennas towards the coverage area.

■Outdoor Installation - When installing an antenna outdoors, be sure to

consider these additional factors:

• Always place the antenna away from power and telephone lines.

• Ensure the antenna, any supporting structure, and cables are all

properly grounded.

• For lightning protection, it is highly recommended to use a lightning

arrestor immediately before the cable enters the building.

Using an External Antenna with the 170wl Radio Card

Installation Procedure

1. Mount the Antenna

Install the antenna in its planned location using the mounting hardware

included with the antenna.

Refer to documentation included with the antenna for specific information

and installation instructions.

2. Connect to the Radio Card

1. Disable the access point radio using the web browser interface, CLI, or

SNMP.

2. Remove power to the access point.

3. Connect the antenna pigtail cable to one of the following:

• Adapter cable. This cable connects the antenna pigtail cable to the

radio card.

• Appropriate extension cable. This cable connects to the antenna

pigtail cable, for an extension of length and/or for a required insertion

loss (table 2), then the extension cable connects to the adapter cable,

which connects to the radio card. Insertion loss is made up of added

cable, connectors, and lightening arrestors.

Radio Card

Adapter Cable

Atenna

Pigtail

Access

Point 520wl

Using an External Antenna with the 170wl Radio Card

Installation Procedure

4. Remove the rubber tab from the end of the radio card.

5. Connect the adapter cable to the radio card.

6. Reconnect power to the access point.

Note Before enabling the radio with an external antenna attached, be sure to first

configure the access point’s antenna mode and transmit power settings.

Adapter Cable

Radio Card

Extension Cable

(Variable Length)

Antenna

Pigtail

Access

Point 520wl

Using an External Antenna with the 170wl Radio Card

Installation Procedure

3. Configure the Radio Transmit Power Control Levels

The access point must be configured for the type of radio card and transmit

(TX) power must be limited to conform to local regulations. Use the regional

settings for each antenna as provided in the TX Power Control table below.

For more information on access point configuration, refer to "Configuring the

AP using CLI Commands" section, ofAppendix C, of the HP ProCurve Wireless

Access Point 520wl User’s Guide, which is on the Documentation CD-ROM

that came with your access point.

Caution An improper combination of transmit power and antenna gain may result in

an EIRP (equivalent isotropically radiated power) power level in excess of the

legally imposed limit. The transmit power reduction required for each antenna

is listed in the following table. Failure to adhere to these guidelines may violate

the radio laws for your region. For additional information on setting radio

transmit power, refer to "Configuring the AP using CLI Commands" section,

of Appendix C, of the HP ProCurve Wireless Access Point 520wl User’s Guide.

Table 2. TX Power Control Setting and Required Insertin Loss.

Antenna Type

European Union

Power Level Setting (%) Required Insertion Loss (dB)

5 dBi Indoor/Outdoor Omni, J8441A 100%

50%

0.7

none

7 dBi Indoor/Outdoor Directional, J8443A 100%

50%

none

8 dBi Outdoor Omni, J8444A 100%

50%

3.7

0.7

11 dBi Indoor/Outdoor wide angle directional,

J8446A

100%

50%

6.7

3.7

14 dBi yagi, J8448A 100%

50%

10.1

7.1

Using an External Antenna with the 170wl Radio Card

Installation Procedure

TX Power Control Limits

Note TX Power Control is only supported on the HP ProCurve Wireless 802.11g AP

Card 170wl. Do not use the 12.5% and 25% options. Although you can select

them, they are not valid for the 170wl.

The TX Power Control feature lets the user configure the transmit power level

of the radio card in the access point at one of four levels:

■100% of the maximum transmit power level of the radio card.

■50%

■25%

■12.5 %

Configuring TX Power Limits Using the Web Inteface

1. Open the Web browser on a network computer.

Note The HTTP interface supports the following Web brouser:

• Microsoft Internet Explorer 6 with Service Pack 1 or later

• Netscape 6.1 or later

2. If necessary, disable the Internet proxy settings. For Internet Explorer

users, follow these steps:

•SelectTools > Internet Options....

•ClicktheConnections tab.

• Click LAN Settings....

• If necessary, remove the check mark from the Use a proxy server

box.

• Click OK twice to save your changes and return to Internet Explorer.

3. Enter the Access Point’s IP address in the browser’s Address field and

press Enter. The Enter Network Password screen appears.

4. Enter the HTTP password in the Password field and click OK. Leave the

User Name field blank. (By default, the HTTP password is "public"). The

System Status screen appears.

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