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46

version 1.0

TCP and IP settings

How do computers communicate in a network

A.2.1

IP address

An IP address consists of two parts. The table below describes these 
two parts.

The division between network portion and node portion is not obvious 
from what the IP address looks like. The division isn’t in a fixed place 
either. This is because not all subnets have the same size. Subnets can 
be small (16 computers) or very large (16 million computers). 

To indicate which part of an IP address is the subnet, and which is the 
computer identification, IP uses a 

Subnet mask

. 

A.2.2

Subnet mask

The subnet mask defines which IP addresses are ‘local’ (i.e. are part of 
your subnet) and which are not local (but have to be reached via the 
internet). Compare this to calling someone via telephone: you can reach 
‘local’ numbers by just entering the subscriber’s number, but for numbers 
that aren’t local you need the area code plus the subscriber’s number. 

The subnet mask looks like an 

IP address

. When you translate the 

subnet mask to a binary number, it breaks down into two sections: first a 
series of 1s and then a series of zeroes (e.g. a subnet mask of 
255.255.255.0 translates to 11111111.11111111.11111111.00000000). The 
1s identify the network portion, the zeroes identify the node portion of the 
address. The subnet mask in this example has 8 bits available for local 
addresses (i.e. 256 different local addresses can be used). 

An example: on a computer, the network settings are defined with an IP 
address of 192.168.201.173 and a subnet mask of 255.255.255.224. 
These would be represented in binary like this:

Table A-2 Sections of the IP address

Part

Identifies

Description

First part

All addresses on 
the subnet share 
this part of the IP 
address. 

subnet (local 
network) to which 
the computer is 
attached

This part of the address is 
also known as the ‘network 
portion’. It is similar to the 
area code of a telephone 
number. 

Second part

the individual 
device

This part of the address is 
also known as the ‘node 
portion’. It is like the 
subscriber number in a 
telephone number. 

Содержание TMW1003

Страница 1: ...11 Mbps Wireless LAN Access Point Document version 1 0 Document number 555004 doc TMW1003 User Manual ...

Страница 2: ...user is encouraged to try to correct the interference by one or more of the following measures A Where it can be done safely reorient the radio or TV receiving antenna B To the extent possible relocate the television radio or other receiver with respect to telephone equipment C If your telephone product runs on AC power plug your product into an AC outlet that s not on the same circuit as the one ...

Страница 3: ...ter 11 2 Installing the Access Point 13 2 1 Introduction 13 2 2 Access Point environment 13 2 3 Physical installation of the Access Point 13 2 4 Desktop installation 14 2 5 Wall mount installation 15 2 6 Connecting the Access Point 16 2 6 1 Power adapter 17 2 6 2 UTP port 17 2 7 LEDs 18 2 8 Unlocking the Access Point 18 2 8 1 Unlocking the Access Point to reconfigure 18 2 8 2 Resetting to the defa...

Страница 4: ...rity against eavesdropping 29 3 6 7 Change WEP settings 29 3 6 8 Security against unauthorized configuration 30 3 6 9 Identity 31 3 6 10 IP Settings 31 4 Troubleshooting 33 4 1 If KickStart does not find the Access Point you are looking for 33 4 2 Browser starts but window stays empty 34 5 Technical specifications 11 Mbps WLAN Access Point 35 5 1 General Specifications 35 5 2 Radio specifications ...

Страница 5: ...2 5 Gateway 47 A 2 6 MAC address 48 A 3 IP configuration 48 A 3 1 DHCP 48 A 3 2 Auto IP 48 A 4 Setting up a home network and connecting it to the internet 49 B Wireless LAN 51 B 1 Introduction 51 B 2 Wireless LAN 51 B 3 The Access Point 52 B 4 Service Set ID SSID 52 B 5 Physics of an Access Point 52 B 5 1 Range 52 B 5 2 Data rates 52 B 5 3 Regulatory Domain 53 B 5 4 Radio Channels 53 B 6 Security ...

Страница 6: ...6 version 1 0 Contents ...

Страница 7: ...e and this manual 1 2 Contents of this manual Table 1 1 gives an overview of the contents of this manual Figure 1 1 11 Mbps WLAN Access Point Table 1 1 Contents of this manual Chapter When to read This chapter Getting started Read this chapter on how to implement a Wireless LAN in your network environment Chapter 2 Installing the Access Point on page 13 Read this for information on how to install ...

Страница 8: ...nnect an Access Point depends entirely on your specific network environment In this section some guidelines on how to add Access Points to your environment are given Chapter 3 Configuring the Access Point on page 21 Read this chapter when you want to adjust the settings of an Access Point This chapter will also explain when to adjust the settings Chapter 4 Troubleshooting on page 33 Read this chap...

Страница 9: ...up a wireless network see Figure 1 2 When you install a new wireless network follow these steps 1 Prepare one client install wireless network card and software 2 Select the IP settings of this client 3 Install the Access Point You can now use the wireless network 4 Optionally configure the Access Point from the already configured client using KickStart and the Web Interface see chapter 3 Configuri...

Страница 10: ...s completely functional to exclude existing problems See Figure 1 3 Follow these steps 1 Install the Access Point and connect it to your wired network You can now use the wireless network 2 Optionally configure the Access Point from an existing computer in the network using KickStart and the Web Interface see chapter 3 Configuring the Access Point on page 21 3 Install the wireless client s Figure ...

Страница 11: ...the computer you want to connect the Access Point to 2 Select the IP settings of this client 3 Install the Access Point n Note for this connection you need to use a crosswired cable You can now use the wireless network 4 Optionally configure the Access Point from your computer using KickStart and the Web Interface see chapter 3 Configuring the Access Point on page 21 5 Install the wireless client ...

Страница 12: ...12 version 1 0 Getting started Adding Access Points to your network environment ...

Страница 13: ...ee chapter 5 Technical specifications 11 Mbps WLAN Access Point on page 35 Range of device see chapter 5 Technical specifications 11 Mbps WLAN Access Point on page 35 2 3 Physical installation of the Access Point n For best performance install the antennas on the Access Point in a vertical position Table 2 1 Overview of this chapter Section Describes 2 2 Considerations about the physical environme...

Страница 14: ...ge contains screws and plugs to fasten the Access Point to a wall 2 4 Desktop installation See chapter 5 Technical specifications 11 Mbps WLAN Access Point on page 35 for regulations on the required free space around the Access Point Determine where you want to place the Access Point Make sure you have a clear area on a desktop Figure 2 1 The Access Point ト ...

Страница 15: ... Point for desktop use on page 15 2 5 Wall mount installation See chapter 5 Technical specifications 11 Mbps WLAN Access Point on page 35 for regulations on the required free space around the Access Point w w w w Before you start drilling holes into a wall make sure that part of the wall is clear of electricity and water pipes Figure 2 2 Access Point for desktop use ト ...

Страница 16: ...t the back of the Access Point 2 Drill holes in the wall at the location of the dots 3 Insert the plugs into the holes 4 Fasten the screws into the plugs and leave about 3 mm of space between wall and screw head 5 Attach the Access Point to the screws 2 6 Connecting the Access Point Your Access Point is now ready to be connected to the electricity net and to your network See 1 4 Adding Access Poin...

Страница 17: ...ired connection see section 1 4 2 Extending a wired network with one or more Access Points on page 10 and section 1 4 3 Connecting an Access Point directly to a computer on page 11 attach the UTP Ethernet cable to the Access Point and connect the cable on the other end to either a hub in the network or a computer If you want to connect to an Access Point via a wired connection it must be connected...

Страница 18: ...ettings 2 8 1 Unlocking the Access Point to reconfigure From the Web Interface you can lock the Access Point prohibiting configuration changes to it see section 3 6 8 Security against unauthorized configuration on page 30 Table 2 2 LEDs LED Function Power The power LED burns when the Access Point is connected to the electricity net See also section 2 6 Connecting the Access Point on page 16 Radio ...

Страница 19: ...ain 2 8 2 Resetting to the default factory setting If you press the reset button longer more than 5 seconds the Access Point will be reset to the default factory settings 1 Insert one end of a paperclip into the hole for the reset button and keep it pressed down The radio LED will first burn constantly 2 Release the reset button when the LED has stopped burning All settings are deleted 3 Use KickS...

Страница 20: ...20 version 1 0 Installing the Access Point Unlocking the Access Point ...

Страница 21: ...b Interface Table 3 1 describes the contents of this chapter 3 2 When to configure the Access Point Configuring the Access Point means installing settings with respect to the use of radio channels security identification etc You only need to configure the Access Point when you want to change these settings n Not configuring your Access Point will make your network accessible to anyone 3 3 Starting...

Страница 22: ...Launch KickStart via the Start menu The application starts up When you click Next KickStart will search for all Access Points within range whether they have been configured properly or not 3 4 3 Select wireless ethernet device In the Select wireless ethernet device dialog select the Access Point you want to configure from the list Once you have selected an Access Point click Next to continue If th...

Страница 23: ...the Select Wireless Device Ethernet dialog Column Description Name The name of the Access Point This is identical to the SSID MAC address Every Ethernet device has a unique address that is permanently linked to that device It cannot be changed See section A 2 6 MAC address on page 48 IP address In order to access a TCP IP network a device must have an IP address in addition to its MAC address See ...

Страница 24: ...can click Suggest to let the system find suitable IP settings Click Next to continue to the next screen The screen Set Gateway of Wireless Device appears see section 3 4 7 Set Gateway address on page 24 3 4 7 Set Gateway address In the Set Gateway of Wireless Device dialog you can set the Gateway address of the wireless device Setting a gateway address is optional A gateway is used for example to ...

Страница 25: ...un dialog browse to the directory that contains KickStart exe and select KickStart exe 4 Click Open You will return to the Run dialog 5 Edit the path after KickStart exe append a Example C Program Files KickStart KickStart exe a This will force KickStart to display the Change IP settings dialog 3 4 10 Web Interface is launched Once the KickStart application has finished and the Access Point is ava...

Страница 26: ...ings Modify the wireless settings radio channel SSID Security against unauthorized network access Allow or deny client access to the network via this Access Point Security against eavesdropping Modify security settings to prevent eavesdropping on the connection to the Access Point Security against unauthorized configuration Modify the Write Community String for the Access Point and lock management...

Страница 27: ...page 29 Table 3 4 Web Interface page Settings Summary Setting How to change the setting Table 3 5 Web Interface page Wireless Settings Option Description SSID This is the Service Set ID Only Access Points and clients that share the same SSID are able to communicate with each other See section B 4 Service Set ID SSID on page 52 Radio Channel This is the channel that the Access Point uses to transmi...

Страница 28: ...e applicable to the option Allow access to all clients accepted clients when the exceptions are applicable to the option Deny access to all clients 3 6 4 To add a client to the exception list Follow these steps to add a client to the exception list see section 3 6 3 Security against unauthorized network access on page 27 1 Click on the button Add client a new dialog opens 2 In the field MAC Addres...

Страница 29: ...ed in the Security against eavesdropping page To display the Security against eavesdropping page click Table 3 7 describes the options 3 6 7 Change WEP settings When you select the WEP radio button or click the Change Settings link the Enter the WEP Settings dialog appears To change the settings 1 Select the WEP mode 40 bit or 104 bit This is the length of the key you ll need to enter For WEP 40 b...

Страница 30: ... itself to unlock it This increases security only people who can physically access the Access Point will be able to change its configuration To display the Security against unauthorized configuration page click 1 Change Password Click on the button Change Password and a window opens in which you can enter the WCS twice Click OK The change is applied and a dialog asking for a user name and password...

Страница 31: ...the following IP settings are displayed IP Address Subnet mask Table 3 8 Web Interface page Identity of the Access Point Option Description Location This is a text field in which you can enter where the Access Point is installed Room 412 You can put any text into this field The text has no influence on how the Access Point works Contact This is a text field in which you can enter the name of the s...

Страница 32: ...ce Gateway It is not possible to change these addresses from within the Web Interface If you want to change the IP settings of an Access Point that already has proper IP settings you need to use KickStart and change them manually see section 3 4 Using KickStart on page 22 ...

Страница 33: ...sible problems with respect to range Is there a network connection Check the network LED The Access Point may take up to a minute to find an IP address it can use if Auto IP is used to assign an IP address Client cannot make connection A wireless client is not yet connected to the Access Point Refer to the manual of the wireless client on how to connect Has the proper network cable been used If th...

Страница 34: ...t window stays empty Possible cause Your browser uses a proxy server to connect to the Web Interface Solution Reconfigure the proxy settings in your browser To do this in Internet Explorer 1 Go to Tools Internet Options Connections LAN Settings 2 Enable Bypass Proxy Server for local address ...

Страница 35: ... IP IPX Environmental specifications Operating temperature ambient 0 C to 40 C 32 F to 104 F Humidity 95 Power specifications DC power supply In 110 230 VAC 50 Hz 150 mA Out 5 VDC 1 A 11 Mbps WLAN Access Point In 5 VDC 1 A Supported bit rates 11 Mbps 5 5 Mbps 2 Mbps IEEE 802 11 DSSS compliant devices using ASBF 1 Mbps IEEE 802 11 DSSS compliant devices using ASBF Connectivity to wired networks Con...

Страница 36: ...t or more Per cell outdoors up to 300 meters 1000 ft Transmit power 18 dBm Frequency range 2 4 2 4835 GHz direct sequence spread spectrum Number of Channels Europe 13 3 non overlapping US 11 3 non overlapping France 4 1 non overlapping Antenna system Dual antenna diversity system 2dB gain Data encryption IEEE security protocol Key Management WEP 40 bit or 104 bit keys Utility Software Web Interfac...

Страница 37: ...555004 doc 37 Technical specifications 11 Mbps WLAN Access Point Other specifications Physical Dimensions Height 109 mm with antennas extended 189 mm Width 105 mm Depth 31 mm ...

Страница 38: ...38 version 1 0 Technical specifications 11 Mbps WLAN Access Point Other specifications ...

Страница 39: ...Regulatory Information disclaimers Installation and use of this Wireless LAN device must be in strict accordance with the instructions included in the user documentation provided with the product Any changes or modifications made to this device that are not expressly approved by the manufacturer may void the user s authority to operate the equipment The Manufacturer is not responsible for any radi...

Страница 40: ... limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy If not installed and used in accordance with the instructions it may cause harmful interference to radio communications However there is no...

Страница 41: ...2 incl A1 1993 A2 1993 A3 1995 and A4 1997 Safety of information technology equipment including electrical business equipment ETSI EN 300 328 Part 1 V1 2 2 2000 07 Part 2 V1 1 1 2000 07 Electromagnetic compatibility and Radio spectrum Matters ERM Wideband Transmission systems data transmission equipment operating in the 2 4 GHz ISM band and using spread spectrum modulation techniques Part 1 Techni...

Страница 42: ... veuillez contacter l IBPT Belgisch Instituut voor Post en Telecommunicatie Germany Deutschland Outdoor use allowed only with a license Please contact Regulierungsbehörde für Telekommunikation und Post REGTP for authorization registration and licensing Im Freiengebrauch ließ nur mit einer Lizenz Bitte kontaktes Regulierungsbehörde für Telekommunikation und Post REGTP für Ermächtigung Ausrichtung u...

Страница 43: ...Per ottenere l autorizzazione la registrazione e la licenza contattate l Ministero delle Comunicazioni Direzione Generale Pianificazione e Gestione Frequenze DGPF Netherlands Nederland Indoor operation allowed in frequency band 2400 2483 5MHz Outdoor operation is limited to 2451 2471 MHz and is required to have a license Please contact Rijks Dienst Radio communicatie RDR for authorization registra...

Страница 44: ...44 version 1 0 Regulatory notes and statements Restricted Wireless LAN device use in EU ...

Страница 45: ...vices that are connected to the internet is TCP IP Transmission Control Protocol Internet Protocol This is also the main protocol in many other computer networks The internet resembles the telephone network to some extent Like a phone number that uniquely identifies one telephone connection IP addresses are used to determine to which computer the data must be sent An IP address looks like this 192...

Страница 46: ...s number The subnet mask looks like an IP address When you translate the subnet mask to a binary number it breaks down into two sections first a series of 1s and then a series of zeroes e g a subnet mask of 255 255 255 0 translates to 11111111 11111111 11111111 00000000 The 1s identify the network portion the zeroes identify the node portion of the address The subnet mask in this example has 8 bit...

Страница 47: ... computers in your network These addresses have special functions The first address in a range is also known as the network address the last address is the broadcast address Subnet masks are sometimes written down as 192 168 201 160 27 where 192 168 201 160 is the first address or network address in the range and 27 is the number of 1s in the binary representation of the subnet mask this subnet ma...

Страница 48: ...s somewhat complicated because every host in the subnet has to have the same subnet number but a unique node number Also the correct Subnet mask will have to be entered Not doing this properly will result in errors To simplify managing an IP network several automated methods have been introduced The two most important ones are DHCP and Auto IP A 3 1 DHCP When a network uses DHCP Dynamic Host Confi...

Страница 49: ... network You cannot use this method if you want to connect to other networks or the internet When a host joins a network will look for a DHCP server first If none is available it will use Auto IP instead A 4 Setting up a home network and connecting it to the internet A typical scenario is that a user has a few computers and wants to network the computers connect to the internet from each computer ...

Страница 50: ...50 version 1 0 TCP and IP settings Setting up a home network and connecting it to the internet ...

Страница 51: ...in A network administrators can install or expand networks without installing or moving wires A wireless LAN is transparent applications function just like they would on a wired LAN Most importantly to use a wireless LAN you do not need to be an expert All you have to do is to find an Access Point in the range of your laptop and connect Table B 1 Contents of Appendix B Wireless LANs Section Descri...

Страница 52: ... waves Radio Frequency to transmit and receive data The range of the propagated power depends on the device and the environment Indoor environments contain objects such as walls metal objects and even people that can effect the propagation of the radiated power Although RF energy can penetrate through most indoor walls and other obstacles these obstacles may influence the quality of the signal of ...

Страница 53: ...l i e an area in which the radio signal of an Access Point is sufficient to join the network The radio channels that you are allowed to use depend on both the capabilities of the PC cards you are deploying as well as the regulations in your area see section B 5 3 Regulatory Domain on page 53 For a single Access Point you can choose any of the available channels However when there are more Access P...

Страница 54: ...devices that share the same WEP key are allowed to communicate with each other Features of WEP are Data encryption using a 40 bit shared key key is 10 hexadecimal characters or 104 bit shared key key is 26 hexadecimal characters No key distribution mechanism The shared key password must be distributed manually to all personnel and either be remembered or stored somewhere on the hard disk Simple au...

Страница 55: ... settings 31 K KickStart 22 L Location 23 31 Lock Access Point 30 M MAC address 23 31 48 N Network address 47 Network LED 18 Network portion 46 Node portion 46 O Open Systems 29 P Power LED 18 R Radio channel 27 36 53 Radio LED 18 Radio specifications 36 Range 36 52 Regulatory domain 27 53 Reset Access Point 19 S Security 53 SSID 23 27 Static IP settings 24 Subnet 46 Subnet mask 46 T TCP IP 23 U U...

Страница 56: ...56 version 1 0 Index ...

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