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13. What is Spread Spectrum

？

Spread Spectrum technology is a wideband radio frequency technique developed by the military

for use in reliable, secure, mission-critical communication systems. It is designed to trade off

bandwidth efficiency for reliability, integrity, and security. In other words, more bandwidth is

consumed than in the case of narrowband transmission, but the trade off produces a signal that

is, in effect, louder and thus easier to detect, provided that the receiver knows the parameters of

the spread-spectrum signal being broadcast. If a receiver is not tuned to the right frequency, a

spread –spectrum signal looks like background noise. There are two main alternatives, Direct

Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

Содержание 802.11g Wireless PCI Adapter WL-8315

Страница 1: ...802 11g Wireless PCI Adapter WL 8315 User s Manual ...

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Страница 3: ... turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures 1 Reorient or relocate the receiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 4 Consult the dealer or an experienced radio technicia...

Страница 4: ...tates Iceland Liechtenstein Norway and Switzerland WEEE regulation To avoid the potential effects on the environment and human health as a result of the presence of hazardous substances in electrical and electronic equipment end users of electrical and electronic equipment should understand the meaning of the crossed out wheeled bin symbol Do not dispose of WEEE as unsorted municipal waste and hav...

Страница 5: ...Y 6 3 1 Site Survey 7 3 2 Profile 7 3 2 1 Configure the Profile 9 3 2 1 1 Configuration 9 3 2 1 2 Authentication and Security 11 3 2 1 3 802 1x Setting Certification 13 3 2 1 4 802 1x Setting CA Server 15 3 3 Link Status 17 3 4 Statistics 18 3 5 Advance 19 3 6 About 22 3 7 WMM Function 22 3 8 Advanced Settings 25 4 TROUBLESHOOTING 26 ...

Страница 6: ...ower consumption of the card is also very low This card provides several levels of power saving modes allowing user customizes the way of saving the power from his her portable or handheld devices 1 1 Features z 2 4GHz ISM band unlicensed operation z A fast Wireless connection without the hassles and cost of running cables z IEEE 802 11b g standard compliant z Support Turbo mode to enhance the dat...

Страница 7: ...ty Operating 10 to 90 Non Condensing Storage 5 to 95 Non Condensing Dimensions 134 5 x 121 x 21mm L x W x H Weight 54g Certifications FCC CE 1 3 Package Contents Before you begin the installation please check the items of your package The package should include the following items 1 x WL 8315 1 x Dipole Antenna 1 x Driver and User s manual CD 1 x Quick Installation Guide If any of the above items ...

Страница 8: ...rd appears click Cancel 7 Insert the bundled CD into the CD ROM drive to launch the autorun program Once completed a menu screen will appear 8 Click the Configuration Utility hyperlink in the WL 8315 field to initiate the installation procedure Note If the menu screen does not appear click Start at the taskbar Then select Run and type E Utility WL 8315 setup exe where the E is your CD ROM drive 9 ...

Страница 9: ...he installation progress in this screen 13 The system will automatically detect the card and display the Hardware Installation screen Click Continue Anyway to proceed 14 Click Finish to complete PLANET WL 8315 Setup 4 ...

Страница 10: ...5 ...

Страница 11: ...ion Utility appears as an icon on the system tray of Windows while the card is running You can open the utility by double click on the icon Right click the icon there are some items for you to operate the configuration utility z Lauch PLANET WL 8315 Utilities Select Lauch PLANET WL 8315 Utilities to open the Configuration Utility tool z Use Zero Configuration as Configuration Utility Select Use Ze...

Страница 12: ...s networks within range of your card It also displays the information of the networks including the SSID BSSID Signal Strength Channel Encryption Authentication and Network Type If you want to connect to any networks on the list double click the item on the list and the card will automatically connect to the selected network Rescan Button Click Rescan button to collect the new information of all t...

Страница 13: ...tc This sign indicates the activated profile is been connecting This sign indicates the activated profile is not been connecting Add Delete Edit Button Click these buttons to add delete edit the selected profiles Activate Button Click Activate to connect to the selected profile When a profile is activated the card will be initially connected to the profile 8 ...

Страница 14: ...d then only the device with the same SSID can interconnect to the card If you want to add the network nearby to the profile list pull down the menu all the networks will be listed for you to add one of them to the profile list PSM Power Saving Mode The power saving function is only available when the network type is in Infrastructure CAM Constantly Awake Mode The card will always set in active mod...

Страница 15: ... default setting 802 11 G only This card can be compatible with both 802 11g and 802 11b wireless stations If there are only 802 11g wireless stations in the network you can set the card to this mode Preamble The preamble defines the length of the CRC block for communication among wireless devices This option is only active in the Ad Hoc network There are two modes including Auto and Long Preamble...

Страница 16: ...ion is needed among the wireless network Shared Only wireless devices using a shared key WEP Key identified are allowed to connecting each other Authentication Type LEAP LEAP is a pre EAP Cisco proprietary protocol with many of the features of EAP protocols Cisco controls the ability of other vendors to implement this protocol so it should be selected for use only when limited vendor choice for cl...

Страница 17: ...A2 supports IEEE 802 1x EAP authentication or PSK technology It also includes a new advanced encryption mechanism using the Advanced Encryption Standard AES AES is required to the corporate user or government users The difference between WPA and WPA2 is that WPA2 provides data encryption via the AES In contrast WPA uses Temporal Key Integrity Protocol TKIP WPA2 PSK WPA2 PSK is also for home and sm...

Страница 18: ...t1 128 bit Input 26 digit Hex values in the A F a f and 0 9 range or 13 digit ASCII characters including a z and 0 9 as the encryption keys For example 01234567890123456789abcdef or administrator 3 2 1 3 802 1x Setting Certification The IEEE 802 1X specification describes a protocol that can be used for authenticating both clients and servers on a network The authentication algorithms and methods ...

Страница 19: ... authentication protocols this card has supported are included as follows This setting has to be consistent with the wireless APs or Routers that the card intends to connect PEAP TTLS PEAP and TTLS are similar and easier than TLS in that they specify a stand alone authentication protocol be used within an encrypted tunnel TTLS supports any protocol within its tunnel including CHAP MS CHAP MS CHAPv...

Страница 20: ...ty Enter the name as the identity for the server Password Enter the password as the identity for the server Use Client Certificate A client certificate is required for TLS and is optional for TTLS and PEAP This forces a client certificate to be selected from the appropriate Windows Certificate Store and made available to the RADIUS server for certification Tunneled Authentication Protocol When the...

Страница 21: ...lacing the issuer s self signed certificate which contains the issuer s public key into the trusted root certification authority certificate store of the host computer Intermediate or subordinate certification authorities are trusted only if they have a valid certification path from a trusted root certification authority Server Name Enter the authentication server name Server name must match exact...

Страница 22: ...the card is connecting to Extra Info Display the link status Channel Display the number of the radio channel and the frequency used for the networking Link Speed Mbps Display the transmission and reception rate of the network The maximum transmission rate is 54Mbps Throughput Kbits sec Display the speed of data transmitted and received Link Quality This bar indicates the quality of the link The hi...

Страница 23: ...r the more radio signal been received by the card This indicator helps to find the proper position of the wireless device for quality network operation Noise Level Display the noise level in the wireless environment 3 4 Statistics This option enables you to view the statistic information of the connection including transmit statistics and receive statistics You may reset the counters by clicking R...

Страница 24: ...here are only 802 11b wireless stations in the network you can set the card to this mode 802 11 G only This card can be compatible with both 802 11g and 802 11b wireless stations If there are only 802 11g wireless stations in the network you can set the card to this mode Select Your Country Region Code The available channel differs from different countries For example USA FCC is channel 1 11 Europ...

Страница 25: ...1 B only the maximum data rate is 11Mbps 11b so that there are only Auto 1 2 5 5 11Mbps options you can select Tx BURST Tx Burst enables the card to deliver the better throughput in the same period and environment This feature only takes effect when the connected AP also supports Tx Burst Enable TCP Window Size The TCP Window is the amount of data a sender can send on a particular connection befor...

Страница 26: ...oint configured to provide Wireless Domain Services WDS takes the place of the RADIUS server and authenticates the client so quickly that there is no perceptible delay in voice or other time sensitive applications Enable Radio Measurement When this parameter is enabled the Cisco AP can run the radio monitoring through the associated CCX compliant clients to continuously monitor the WLAN radio envi...

Страница 27: ...ice over Internet Protocol VoIP phones televisions VCRs and MP3 players IEEE 802 11e Quality of Service QoS The Wi Fi Alliance defined WMM as a profile of the IEEE 802 11e extensions for 802 11 networks will help to define the priorities of the data traffics by the data categories to provide enhanced multimedia support When the WL 8315 is connected to the AP or Router with WMM function you can ena...

Страница 28: ...B Right Click the Wireless Network Connection and select Properties C Click Configure 23 ...

Страница 29: ...D Select Advanced page enable the WMM Capable 24 ...

Страница 30: ...ion when B mode station and G mode station exist concurrently CAM when AC power When use AC power it doesn t enter into sleep mode Country Region 11A Not applicable on WL 8315 Country Region 11G Supporting 11G Channel for different country Frame Threshold To enhance throughput when traffic is high Frame Aggregation To ehhance throughput when traffic is low IEEE 802 11h Not applicable on WL 8315 Lo...

Страница 31: ...des the modulation schemes found in 802 11b including CCK for 11 and 5 5 Mbps and Barker code modulation for 2 and 1 Mbps B A protection mechanism called RTS CTS that governs how 802 11g devices and 802 11b devices interoperate 2 What is the IEEE 802 11b standard The IEEE 802 11b Wireless LAN standard subcommittee which formulates the standard for the industry The objective is to enable wireless L...

Страница 32: ...th Netware Windows 2000 or other LAN operating systems to support printer or file sharing 11 Would the information be intercepted while transmitting on air WLAN features two fold protection in security On the hardware side as with Direct Sequence Spread Spectrum technology it has the inherent security feature of scrambling On the software side WLAN series offer the encryption function WEP to enhan...

Страница 33: ...ther words more bandwidth is consumed than in the case of narrowband transmission but the trade off produces a signal that is in effect louder and thus easier to detect provided that the receiver knows the parameters of the spread spectrum signal being broadcast If a receiver is not tuned to the right frequency a spread spectrum signal looks like background noise There are two main alternatives Di...

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