Cabletron Systems 3Com manual Simple Network Management Protocol Snmp

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24CHAPTER 1: OVERVIEW OF DIGITAL WIRELESS NETWORKING

them to the wireless client and the wireless client goes back to sleep. A DTIM field, also called a countdown field, informs wireless clients of the next window for listening to broadcast and multicast messages. The AP sends the messages following the nth beacon where n is the DTIM interval defined in the AP. When the AP has buffered broadcast or multicast messages for associated wireless clients, it sends the next DTIM with a DTIM Interval value. This value decreases by '1' with each successive beacon. The AP sends broadcast and multicast messages immediately following the beacon where the DTIM value is '0.' To prevent a PSP-mode wireless client from sleeping through a DTIM notification, select a PSP mode value less than or equal to the DTIM value. PSP-mode wireless clients hear the beacons and awaken to receive the broadcast and multicast messages.

A TIM is a compressed virtual bitmap identifying the AP associated wireless clients in PSP mode that have buffered directed messages. wireless clients issue a poll request when APs issue a TIM. A beacon with the broadcast-indicator bit set causes the wireless client to note DTIM Count field value. The value informs the wireless client of the beacons remaining before next DTIM. This ensures the wireless client turns on the receiver for the DTIM and the following BC/MC packet transmissions.

HTTP, HTML Web Server Hypertext Transfer Protocol (HTTP) is the native language of the World Wide Web. Support The HTTP protocol makes requests from browsers to servers and responses from

servers to browsers. This function provides the user with a Web-based format for configuration and firmware download.

Web pages are written in Hypertext Markup Language (HTML). HTML allows the user to create Web pages containing text, graphics, and pointers or links to other Web pages or elsewhere on the page or document. Pointers are known as Uniform Resource Locators (URLs). A URL is essentially the name of the Web page. The URL consists of three parts:

1Protocol (or Scheme)

2Fully Qualified Domain Name (FQDN), the machine where the page is located

3Local name that identifies the page (usually the HTML file name).

The HTML language describes how to format the document, indication which fonts to use, much like a copy editor describes which fonts to use, such as the location, color, header size and text.

Management Options Managing AirConnect includes viewing network statistics and setting configuration options. Statistics track the network activity of associated wireless clients and data transfers on the AP interfaces. Configuration involves, among other things, setting system operating parameters and filters used in bridging.

The AP requires one of the following to perform a custom installation or maintain the AirConnect network:

■Simple Network Management Protocol (SNMP).

■Wired or wireless LAN workstation with a telnet client.

■Terminal or PC with RS-232 connection and access to ANSI emulation.

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Contents AirConnect 11 Mbps Wireless LAN Access Point User Guide Version3Com Corporation Bayfront Plaza SantaClara, California 95052-8145Contents Installing Access Point Hardware Monitoring Wireless Clients Access Point Installation Configuring the AP Access Point Specifications Technical Support Page Overview of Digital Wireless Networking IntroductionAirConnect Network TopologiesOverview of Digital Wireless Networking AirConnect Network Topologies AirConnect Access Wireless clientsPoint To the Ethernet LANAirConnect Access Point PowerBASE-T Wireless clients and APsRadio Basics Results in the original digital dataRadio Basics Wireless LAN Service Area 802.1d Spanning Tree SupportSite Surveys Filtering and Access Control Network Control Protocol NCP as described PPP Connection Data Rate Requirement Overview of Digital Wireless Networking Theory of Operation Simple Network Management Protocol Snmp Using Snmp Programmable Snmp Trap SupportManagement protocol MIB Increased MIB SupportUsing the User Interface Method DescriptionInstalling Access Point Hardware PrecautionsPackage Contents RequirementsPower Options Standard power supply 115/230VAC, 50/60Hz, 24V/14Remote power distribution system, Part Number AP-PS-11 US line cord Part NumberMounting the AP BelowWall Mount To mount an AP on a wall Ceiling Mount To mount an AP on a ceiling Mounting the AP Using PowerBASE-TPowerBASE-T can be used to power the AP LED Indicators Off Blinking Power No power Power on During boot sequenceCondition, and other activity Troubleshooting 3Com Support CenterVerify AP Operation Electrical Management System EMS operating outletVerify Network Wiring Topology Network connection verificationPage Monitoring Statistics System PropertiesInterface Statistics Forwarding CountsEthernet Statistics Radio FrequencyStatistics Miscellaneous Statistics window, select Main Menu→Misc StatisticsPress Esc or Previous F4 to exit Type Name DefinitionClearing Statistics Known APsSelect Clear All Statistics Gaining Access to the User Interface UI Using a Web Browser Gaining access to the User Interface UIHelp File Access Setup Network Web Server Help File AccessAccessing the Web Browser UI Select Virtual DirectorySelect Close/Exit Select System ConfigurationSelect Special Functions Select Reset AP Select Save F1 to save the configurationUnder Configuration, select Security Select System Password Type the case sensitive AP nameSelect Easy Setup--Easy Setup Select Easy Setup--Easy Setup Click Add/Delete GatewaysParameter Description Adding Allowed Wireless Clients Adding or Deleting a Range of Allowed Wireless ClientsAdding or Deleting Disallowed Wireless Clients For the Short RF Preamble setting, click Disabled ConsiderationsEnabling or Disabling Encryption Select Configuration--SecurityEnable or disable interfaces on the AP Interface Description Default ConditionFrequency No. of Channels Country Enter the Multicast Mask data and voice values Select Enabled or Disable All for All Snmp Traps Snmp Trap Description Default ValueConfiguring the Originating Modem Configuring the Answering Modem Filtering to Forward PacketsFiltering to Discard Packets Removing Filtered Packet Types Networking Protocols Click Delete FilterDisabling Type Filtering Under Configuration, select FirmwareActive. Clear the wireless client association table for Special Function DescriptionMonitoring Wireless Clients Wireless ClientsSelect Regular at the Wireless Clients prompt Indicates a 3Com voice-enabled device Ascii Interface Latest version. Refer to Manually Updating AP Firmware onVersions Enable serial port Configure the AP for the followingArrow/Function Key Control Character To exit from submenus, press Esc Prompt DescriptionSelect Telnet Logins Press Tab to select System PasswordTo enable and configure the serial port connection on the AP Configuring The Serial PortSetting Description Configuring the Dial-Up SystemHanging Up Select Modem HangupInstallation WindowConfiguring the AP That can associate with this AP. The default is Disabled Wsaid PPP Direct Establishing a ConnectionPPP with Modems Set the Connect Mode to Answer Originating APAnswering AP From the answering APs UIFor automatic dial-out, reset the AP Range of Wireless Clients Press up/down arrows to toggle between range and individualRemoving Allowed Wireless Clients Enable/Disable the ACLRemoving All Allowed Wireless Clients Load ACL from Wireless Client List Adding Disallowed Wireless ClientsRemoving Disallowed Wireless Clients Address FilteringClearing Wireless Setting LoggingClients from the AP OptionsManually Updating AP FirmwarePrevious version of AP firmware Remainder of this procedure uses Windows 98 as an example Select Alter Filenames/HELP URL/TFTP and press EnterType the firmware file name in the Download Filename field Open the Special Functions window Select Transfer from the emulation program menu barSelect Send File Download is complete when the UI displays Select Alter Filenames/HELP URL/TFTP Server and press EnterUsing MD5 AuthenticationPerforming Pings Extended RoamingWireless client and the access point EncryptionHex-digit sequence Press the Tab key to highlight .Short RF Preamble Enabled Restoring ConfigurationsSelect Restore Factory Configuration Access Point Specifications Physical CharacteristicsRadio Characteristics Frequency No. of Channels Country Output CharacteristicsNetwork Characteristics Services Technical SupportOnline Technical World Wide Web SiteLatin America North AmericaTo obtain an RMA number, call or fax Page Index AsciiSnmp agent 3Com Corporation Limited Warranty 3Com AirConnect Access PointObtaining Warranty Regulatory Compliance Information Radio Frequency Interference Requirements CanadaImportant Read Before Using This Product 3Com End User Software License Agreement
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