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Содержание NJ220 - IntelliJack Switch

Страница 1: ...3Com IntelliJack Switch NJ220 User Guide 3CNJ220 www 3Com com Part No 10016226 Rev AA Published June 2007 ...

Страница 2: ...chever is applicable You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in or delivered to you in conjunction with this User Guide Unless otherwise indicated 3Com registered trademarks are registered in the United States and may or may not be registered in other countries 3Com and the 3Com logo are registered trademarks of 3Com C...

Страница 3: ...chine 21 USING THE LOCAL CONFIGURATION MANAGER Initializing the NJ220 IntelliJack 25 Setting Location Information Setting the Group Name Setting the IP Address Setting Advanced Options 27 Changing the Password Configuring for SNMP USING THE CENTRAL CONFIGURATION MANAGER Discovering NJ220 Devices on Your Network 29 Viewing Device Properties 33 General 34 Network Identification Port Information Prod...

Страница 4: ...NMP Configuration 52 Advanced Configuration 53 Event Alerts Port Based Configuration Flow Control AutoMDI X Data Rate Control Restoring Default Values 55 Finding Computers Connected to IntelliJacks 59 Upgrading the NJ220 Firmware 60 Viewing Log Files 63 Viewing and Canceling Scheduled Firmware Upgrades 64 TROUBLESHOOTING THE NJ220 Troubleshooting Matrix 65 TECHNICAL SUPPORT Where To Go For Help 67...

Страница 5: ... an optional local power supply You can manage the NJ220 IntelliJack using the included Central Configuration Manager or Web Configuration Manager You can also use a supported SNMP management console as you would with any managed device on your network but greater management and control is available through the Configuration Manager software Management features include Device discovery Port status...

Страница 6: ...work that uses IEEE 802 3af compatible Power Over Ethernet An additional LED indicates when the port is forwarding power to a device connected to that port 2 Slot for adapter plate Can be fitted with an adapter plate which can be installed with up to two pass through ports 3 Adapter plate with installed pass through port connector Can be used for voice or other networking applications The port byp...

Страница 7: ...your network does not support Power Over Ethernet 1 Ethernet uplink port RJ 45 female Connects the IntelliJack to the network Make sure the port on the network switch to which the IntelliJack is connected is configured as a standard MDI X port 2 Slot for adapter plate Can be fitted with an adapter plate which can be installed with up to two pass through ports 3 Adapter plate with installed pass th...

Страница 8: ...Adapter plate screws 2 for mounting the adapter plate to the IntelliJack Obtaining Optional Components The IntelliJack works with the following optional components all of which are available from 3Com Order online at www 3com com or by calling 1 877 949 3266 NOTE The connectors for the adapter plates must be purchased from the manufacturer For a list of supported connectors go to the IntelliJack s...

Страница 9: ... single port or multi port power supply 8 Connect network devices to the IntelliJack page 13 Local power supply For locally powering a single IntelliJack required if your network does not support Power Over Ethernet 3CNJPSL VoIP telephone power cable For powering a VoIP telephone on a network that uses Capacitive Power Discovery Process compatible Power Over Ethernet 3CNJVOIPMOD NBX 3CNJVOIPMOD 20...

Страница 10: ...ia a 3Com local power supply Before you begin the installation determine which type of power supply the IntelliJack will use Using an Integrated Switch with Power Over Ethernet To use Power Over Ethernet you must have a switch on the network that has Power Over Ethernet integrated into it You must then determine if it is compatible with IEEE 802 3af Using a Multi port Ethernet Power Supply To use ...

Страница 11: ... Ethernet Power Supply To use a single port power supply connect the power supply to the network hub or switch and to the IntelliJack as shown in the following illustration See Obtaining Optional Components on page 4 for ordering information For complete installation instructions see the single port Ethernet power supply documentation Using the 3Com Local Power Supply To use the local power supply...

Страница 12: ...work cable s from the wiring closet to the location of the IntelliJack 2 Thread the network cable s through the empty slot on the IntelliJack 3 Terminate the end of the network cable s with the connector s you purchased separately Refer to the connector manufacturer s instructions for terminating the cable Be sure to test end to end system functionality and verify that it is working 4 Snap the con...

Страница 13: ...unctionality adhere to the following network cabling standards during installation n ANSI TIA EIA 568 Commercial Building Telecommunications Cabling Standard n ANSI TIA EIA 569 Commercial Building Standard for Telecommunications Pathways and Spaces NOTE Some cubicle openings have a depth of 1 2 inches In this case install the IntelliJack using the extension ring available for purchase separately s...

Страница 14: ...nnector Refer to the connector manufacturer s instructions for terminating the cable Be sure to test the connector and verify it is working Connecting the IntelliJack to the Network The method for connecting the IntelliJack to the network is determined by how your network cable is terminated as described in the previous section Setting up the Network Cabling at Your Site If the end of the cable is...

Страница 15: ...pening has a depth of fewer than 1 5 inches does not support the NEMA WD6 standard or does not have pre drilled screw holes mount the IntelliJack using the extension ring as shown below NOTE The extension rings are designed to stack on top of one another If you need more than 0 3 inches of clearance simply snap an additional extension ring to the back of the IntelliJack CAUTION Make sure the vents...

Страница 16: ...ly you must purchase a local power supply from 3Com see Obtaining Optional Components on page 4 To connect the local power supply to the IntelliJack please follow these steps 1 Route the power cable through the strain relief of the IntelliJack as shown in the diagram below 2 Securely mount the IntelliJack on a wall 3 Plug the power cable into the IntelliJack 4 Secure the local power supply and cab...

Страница 17: ... LED which lights when a device is connected Port 1 also has an amber LED which lights when the IntelliJack is forwarding power to a connected device WARNING Use the local power supply available from 3Com Failure to do so may result in damage to the IntelliJack or may result in a hazardous situation LED Description LAN n On The IntelliJack is connected to the network and a link has been establishe...

Страница 18: ...14 CHAPTER 1 INSTALLING THE NJ220 INTELLIJACK ...

Страница 19: ... with them or Windows Vista Installing the Local and Central Configuration Managers Run the following steps to install the Configuration Manager software 1 Insert the Configuration Manager software CD into your Windows 2000 Windows XP Pro Windows NT or Windows Vista computer NOTE You will use the Local Configuration Manager for initial configuration of the NJ220 on your network It s usually easies...

Страница 20: ...G THE CONFIGURATION MANAGERS 2 If your computer is configured to Auto Play CDs the installation will start automatically If not double click the setup exe icon on the CD and you will see this window 3 Click Next to continue ...

Страница 21: ... Carefully read the license agreement If you agree click Yes I accept and Next to continue 5 The installation will present Readme Information This is also found in the Readme txt file on the installation CD Please read the information and click Next to continue ...

Страница 22: ...6 Enter your user and organization names You can also specify whether you want the management programs to be available to just you or to anyone that may use the computer you re installing these applications on Select the option you prefer and click Next ...

Страница 23: ...uration Managers 19 7 The program files will be installed in the directory C Program Files 3Com IntelliJack If you want to change the location of the installation click Change Otherwise click Next to accept the default location and continue ...

Страница 24: ...d click Next The Typical installation will install both the Local Configuration Manager and the Central Configuration Manager on your system The Custom installation option lets you install just one of the programs if you wish 9 Review the settings you selected and click the Install button ...

Страница 25: ...discovered and managed through a standard web browser The Web Configuration Manager lets you access and control IntelliJacks from any Web enabled computer on your network In order to enable the Web Configuration Manager you will need the following A servlet compliant web server or stand alone servlet engine Internet Explorer 6 0 or later Netscape 7 0 or later web browser NJ220 Installation CD The ...

Страница 26: ...vironment Variables Under System Variables section on the Advanced tab click New In the dialog box that appears enter JAVA_HOME in the variable home field and the directory path to the JDK in the variable value field Click OK 4 Copy the CB DLL file from the NJ220 Installation CD into the Windows system directory C WINNT SYSTEM32 5 Copy the buildDirs bat file from the NJ220 Installation CD to the r...

Страница 27: ...go to the bin subdirectory under the Tomcat installation directory type startup and hit Enter A new command window will open At this point your server should be configured and running Now that your server is configured you can use the Web Configuration Manager from any Web enabled machine To do so 10 Open up your Internet Explorer or Netscape browser and point it to the following URL http Your_Ser...

Страница 28: ...24 CHAPTER 2 INSTALLING THE CONFIGURATION MANAGERS ...

Страница 29: ...e four personal area network PAN ports on the front of the NJ220 2 Click on the desktop shortcut icon labeled IJ NJ Local Config Mgr to start the program When it launches you will see a window like this 3 The MAC address Serial Number and Firmware Version of the currently connected NJ220 will appear at the top of the window If you connect to another NJ220 you must click the Query button to refresh...

Страница 30: ...in the appropriate fields 8 If you wish check the box next to Lock IP Address Selecting this option will ensure that the IntelliJack will always use a particular address 9 Click the Configure button and the Local Configuration Manager will ask you to enter the password for the device If you haven t changed the password you should enter the default password which is password without the quotes Your...

Страница 31: ...ombination of letters and numbers between 8 and 32 characters 3 To configure the NJ220 for management with an SNMP console select the SNMP Configuration box Enter the GET Community string and SET Community string in the appropriate fields Each field lets you enter any combination of letters and numbers up to 32 characters 4 Click the Configure button and the Local Configuration Manager will ask yo...

Страница 32: ...28 CHAPTER 3 USING THE LOCAL CONFIGURATION MANAGER ...

Страница 33: ...ur network We recommend that you keep the Central Configuration Manager CCM running on your machine Information such as traps and alerts are sent tot he CCM on a periodic basis If you shut off the machine or close the configuration manager you will not be able to receive this information Discovering NJ220 Devices on Your Network In order to manage the NJ220 IntelliJacks on your network the Central...

Страница 34: ...ouble clicking on the IJ NJ Cent Config Mgr desktop icon When it launches you will see a window similar to this one 2 Select Discovery from the Devices menu or click the Discover button on the toolbar The following window will appear NOTE The default subnets are the ones your machine is connected to ...

Страница 35: ...scovers If unchecked the discovery process will add newly discovered devices to the current database 5 Click OK to start the discovery process The device discovery tool will return the following information from the NJ220 IntelliJacks on your network IP address MAC address Subnet address Group name Location information Firmware version You can sort this information in ascending or descending order...

Страница 36: ...t of IP subnets to choose from Selecting Network will show all of the discovered devices in the database If you select a particular subnet only the devices in that subnet will be displayed When Firmware Ver is selected you will see a list of the different firmware versions loaded on the devices This view is particularly useful if you want to select only the devices with an old firmware version so ...

Страница 37: ...ime see Changing Device Configuration on page 43 To get more detailed information about a device you should check its properties The process for configuring one or more IntelliJacks is the same You choose the changes or configurations you wish to make by selecting them from the various tabs in Device Properties for changes to a single IntelliJack or Configure for single or multiple IntelliJacks Wh...

Страница 38: ...c IP address or gets its address from a DHCP server You can also view and edit the IntelliJack s Group Name and Location 4 Click Apply to save any changes you make to the fields in this window Port Information 5 In the middle of this window you ll see information about each of the four PAN ports on the front of the IntelliJack You can check to see if the port is Enabled or Disabled if there is a n...

Страница 39: ...o find out more information or configure that particular port Click OK to save your changes or Cancel to discard them Product Information 6 Under the Product Information box you can see the current firmware version of the IntelliJack the Product Name and the Serial Number ...

Страница 40: ...ists Priority Schedule Policy LAN Port Egress Mode LAN Port Ingress Mode Max Frame Size Counter Mode and Power Forwarding 8 Simply select the value you wish to change from the drop down list of options NOTE For help determining the best configuration options for your system see the Changing Device Configuration section NOTE You can click Apply at any time to save the changes you have made But be s...

Страница 41: ...and an aging time is 304 seconds for each entry The NJ220 IntelliJack lets you manage its ATU table You may want to know which MAC addresses have been plugged into a particular IntelliJack You may want to associate a MAC address with selected ports so the unselected ports will not receive frames from this MAC address You may want to set a certain priority level to the frames associated with the MA...

Страница 42: ...IDs or add to it You can edit existing VLAN settings tagging schemes and port associations by clicking the Edit button The VLAN table is a record of the VLAN settings which have been configured for a particular IntelliJack You may want to know which ports have been assigned a VLAN ID VID whether packets are tagged or untagged and whether the ports are associated with one another All of these confi...

Страница 43: ...ach of the four PAN ports on the IntelliJack RMON counters are extensions to the Simple Network Management Protocol SNMP that provide comprehensive network monitoring capabilities see appendix C page 71 for detailed information 12 To load the counter information from the IntelliJack click the Read button This window lets you monitor the traffic through your network by displaying statistics for man...

Страница 44: ... tab to see the following window 14 You can view and edit the SNMP Community String settings and Trap settings for this particular NJ220 NOTE The device log records information regarding watch dog timer errors or other abnormalities If for example the IntelliJack has unexpectedly rebooted the event will be recorded in the device log 3Com Customer Support can use information in the device log to he...

Страница 45: ...d Settings 16 Click on the Advanced Settings tab to see the following window 17 You can view the Event Alert Level and 802 1X Settings configured for this particular NJ220 802 1X is a security protocol for LANs that relies on the Extensible Authentication Protocol EAP to pass messages to RADIUS authentication servers NOTE For help configuring SNMP and 802 1X settings for your system see the Changi...

Страница 46: ...e box will be grayed out on the CCMs of all other machines 18 Click Apply to save any changes you make and a configuration summary dialog box will appear Verify the information and click OK 19 Click Exit to close the Device Property window Alert Level Notifying Event Level 0 Disable all alert messages None Level 1 Allow critical alerts Device Power Failure Reboot Abnormal Reboot IP Address Change ...

Страница 47: ... and select Configuration from the pop up menu NOTE It is possible to configure multiple IntelliJacks at the same time NOTE To make configuration changes to a IntelliJack from the Central Configuration Manager the NJ220 must be part of the device database See the section on Discovering NJ220 Devices on Your Network for information about including new devices in the database You must also be able t...

Страница 48: ...ecking the box next to the characteristic you want to modify Then select a value from the drop list Forwarding Enable is the default setting for the Port State The other option is Blocking Disable Forwarding Enable allows traffic to pass through the individual ports By setting the Port State to Blocking Disable you can block any traffic from passing You may want to set the Port State to Blocking D...

Страница 49: ...plugged into Port 1 of the NJ220 The default setting of the NJ220 is auto detect We recommend that you keep this setting as part of your configuration to ensure that power will only be forwarded to devices capable of receiving it The IEEE802 3af standard requires a powered device to present a signature to the power sourcing equipment The power sourcing equipment will check this signature and will ...

Страница 50: ...st Both the Use IEEE 802 1p Traffic Class Field and Use IP TOS DiffServ fields look up schemes examine Ethernet packets to determine their prioritization The former looks at one portion of the packet effectively making it a Layer 2 tool The latter looks at a different part of the packet effectively making it a Layer 3 tool The Look up Scheme is part of the prioritization of Ethernet packets Priori...

Страница 51: ... ports 16 To change the VLAN mode setting click the box and select an option from the drop list You can choose to Disable the VLAN In this mode ingress frames are forwarded through default switching rules You can also choose Enable unrestricted VLAN In this mode the port is associated with the current VLAN ID you have set Frames ingressed into this port without a VLAN tag or with the same VLAN ID ...

Страница 52: ... different VLANs 19 You can also change the Incoming from LAN tag scheme By default all frames are received unmodified By receiving frames unmodified you will not risk losing communication between upstream switches and the devices connected to the IntelliJack due to misaligned VIDs If an upstream switch is sending a tagged packet but the device connected to one of the IntelliJack ports does not ne...

Страница 53: ... the changes by clicking the box and selecting an option from the drop list The default setting for Port Authorize Mode is Disable 802 1X 802 1X is a standard for port based network access control Typical 802 1X implementations in an Ethernet switch usually include the authenticator as well as NOTE You should change the password to ensure that no one else can re configure your system Make sure you...

Страница 54: ...ed unless their MAC addresses are listed in the ATU 802 1X with IP Phone is a special case of 802 1X secure mode In this mode when a 3Com IP phone is connected to the IntelliJack the phone s MAC address will be locked into the ATU automatically Therefore packets sent from the phone can pass through by default without further authentication If 802 1X control is not required an IP phone can connect ...

Страница 55: ...the settings for RADIUS servers The supplicant settings let you configure the IntelliJack as a supplicant to an 802 1X enabled upstream switch To enable this option select the box next to Supplicant When you do the other fields on the screen will become active You can enter a Supplicant User Name and Password as well as an EAP Type setting MD5 is the only EAP type that the IntelliJack currently su...

Страница 56: ...s the ability to send traps notifications to a trap destination such as an SNMP server when one or more conditions have been met Traps are network packets that contain data relating to a component of the system sending the trap When the condition for the trap has been met the SNMP agent forms an SNMP packet and sends it to the administration application A Cold Start Trap signals the administration...

Страница 57: ...via a Management Information Database MIB browser 32 Set the Trap Community String in the final field of this window Advanced Configuration 33 Select the Advanced Configuration tab for this window Event Alert Levels 34 At the top of this window is a setting to specify the Event Alert Level The NJ220 can alert you when specific events occur While this lets you monitor and respond to network events ...

Страница 58: ...ce it s plugged into are straight through cables not cross over cables If you use cross over cables to connect devices to your network you would need to set this option to Manual MDIX Configuration so that network traffic can pass between the device and the PAN port of the IntelliJack 38 You may want change the Data Rate Control options The default settings allow all types of traffic to pass throu...

Страница 59: ...twork uses larger frames you can select the 1535 byte option Restoring Default Values 40 At the bottom of this window is an option to restore some of the configuration settings to their default values If you check this box the following settings will be restored Priority Option 0 2 4 6 Multiplier 1 2 4 8 Rate limiting option 128 Kbps 128 Kbps 256 Kbps 512 Kbps 1 Mb 256 Kbps 256 Kbps 512 Kbps 1 Mb ...

Страница 60: ...ion IP Address Subnet Mask Gateway Device Log stored in EEPROM Management Port VID 802 1X Supplicant Status Disabled 802 1X Supplicant User Name and Password Blank Port Setting Default Value State Forwarding Link Auto negotiation Flow Control Off MDI X Force MDI Multicast Limit 3 Priority Lookup Tag IPV4 Port Priority 0 or 1 VLAN ID 1 802 1Q VLAN Mode Disable VLANs Data Rate Limit All frames Maxim...

Страница 61: ...ou may want to provide network access between the hours of 7 00 a m and 10 00 p m You can use the schedule function to automatically turn off the ports at 10 00 p m You can even use this feature to automatically repeat the operation on a regular basis From the file menu you can use the features Backup and Restore The Backup operation lets you save a snapshot of the configuration of one or more Int...

Страница 62: ...G THE CENTRAL CONFIGURATION MANAGER The Restore operation lets you recover configurations you saved with Backup When you initiate a Restore you will be asked for the Secret Key you established with the Backup operation ...

Страница 63: ...uter or networked device you can use the Central Configuration Manager to find the right IntelliJack 1 Select Find Location from the Tools menu You will see a window like this 2 Enter the IP address or the MAC address of the network device you wish to find 3 Click the Find button When the search is complete the Search Results field will display the IP address of the NJ220 that the network device i...

Страница 64: ...re IntelliJacks you want to upgrade You can select groups of IntelliJacks using one of the grouping options available to you in the drop down list at the top left corner of the main window 2 Select Upgrade from the devices menu A window like this will appear 3 Select Yes to continue the upgrade operation A window like this will appear 4 Select a valid firmware image by typing the path to the file ...

Страница 65: ...or select a specific time and date to send the file You may for example want to perform an upgrade during off hours such as a weekend 6 Click Next and a window like this will appear 7 Review the list of IntelliJacks you want to upgrade If you want to modify this list click Cancel and restart the firmware upgrade procedure ...

Страница 66: ...62 CHAPTER 4 USING THE CENTRAL CONFIGURATION MANAGER 8 Type your password in the Password field then click Finish The Upgrade Progress dialog box will appear ...

Страница 67: ... Configurator Log subdirectory under the directory where you installed the IntelliJack configuration software You can the log by selecting Log History from the View menu A window like this will appear To view the details of a particular log select it and click Detail If an upgrade or configuration operation fails for some reason a message will appear in the log file Consult the troubleshooting gui...

Страница 68: ...age to the IntelliJacks in your network To view and make changes to the firmware upgrades you have scheduled follow these steps 1 Select Manage Schedule from the Tools menu A window like this will appear 2 To view the details of a scheduled upgrade select it from the list and click Show Devices To cancel a scheduled upgrade select it from the list and click Delete ...

Страница 69: ...ctions for terminating the cable Be sure to test the connector and verify it is working Has a valid connection to the network Adheres to proper length and cabling specifications for your network The IntelliJack is configured for manual MDI Be sure to use a straight through cable If you want to use a cross connect cable you must change settings in the Configuration Manager software Troubleshooting ...

Страница 70: ...evice does not exceed 7 watts The IntelliJack can only forward up to 7 watts Power LED is blinking continuously Unit has detected a problem Traffic can pass through but management will not work Contact 3Com Technical Support Authentication Failure Wrong password has been entered Confirm correct password and re type Timeout Device did not respond within a specified period of time Refresh the screen...

Страница 71: ...s Online 3Com offers the following support tool 3Com Knowledgebase Helps you to troubleshoot 3Com products This query based interactive tool is located at http knowledgebase 3com com It contains thousands of technical solutions written by 3Com support engineers Purchase Extended Warranty and Professional Services To enhance response times or extend your warranty benefits you can purchase value add...

Страница 72: ...iginally purchased 3Com recommends that you buy an Express or Guardian contract a Software Upgrades contract or an equivalent support contract from 3Com or your reseller Support contracts that include software upgrades cover feature enhancements incremental functionality and bug fixes but they do not include software that is released by 3Com as a separately ordered product Separately orderable sof...

Страница 73: ...Number Country Telephone Number Asia Pacific Rim Telephone Technical Support and Repair Australia Hong Kong India Indonesia Japan Malaysia New Zealand 1800 075 316 2907 0456 000 800 440 1193 001 803 852 9825 03 3507 5984 1800 812 612 0800 450 454 Philippines PR of China Singapore South Korea Taiwan Thailand 1800 144 10220 or 029003078 800 810 0504 800 616 1463 080 698 0880 00801 444 318 001 800 44...

Страница 74: ...Costa Rica Curacao Ecuador Dominican Republic 1 800 988 2112 0 810 444 3COM 1 800 998 2112 1 800 998 2112 1 800 998 2112 52 5 201 0010 1 800 998 2112 1 800 998 2112 0800 13 3COM 1 800 998 2112 AT T 800 998 2112 AT T 800 998 2112 AT T 800 998 2112 1 800 998 2112 AT T 800 998 2112 AT T 800 998 2112 Guatemala Haiti Honduras Jamaica Martinique Mexico Nicaragua Panama Paraguay Peru Puerto Rico Salvador...

Страница 75: ...network 100 Mbps Ethernet 100BASE TX Ethernet IEEE 802 3u industry standard for a 100 Mbps baseband CSMA CD local area network Performance Auto negotiation Communication speed 10 Mbps or 100 Mbps and duplex mode full or half can be determined through auto negotiation with the attached devices The IntelliJack attempts to negotiate the fastest connection possible 100 Mbps full duplex The communicati...

Страница 76: ...ment Operating temperature 32 to 104 F 0 to 40 C Storage temperature 22 to 194 F 30 to 90 C Operating humidity 10 90 noncondensing Storage humidity 10 90 noncondensing Operating Altitude 8 000 ft max Storage Altitude 20 000 ft max Standards Conformance IEEE802 3 10BASE T 100BASE TX and auto negotiation Power Over Ethernet Capacitive Power Discovery Process and IEEE 802 3af Power forwarding IEEE802...

Страница 77: ...he count includes the FCS but not the preamble InBadOctets Total data octets received in frames with an invalid FCS fragments and jabbers are included The count includes the FCS but not the preamble Undersize Total frames received with a length of less than 64 octets but a valid FCS Fragments Total frames received with a length of less than 64 octets and an invalid FCS In64Octets Total frames rece...

Страница 78: ...in OutBroadcasts or OutPause OutFCSErr Total frames transmitted with a valid length and an invalid FCS OutGoodOctets Total data octets transmitted The count includes the FCS but not the preamble Out64Octets Total frames transmitted with a length of exactly 64 octets including those with errors Out127Octets Total frames transmitted with a length of between 65 and 127 octets inclusive including thos...

Страница 79: ...Total number of successfully transmitted frames that experienced exactly one collision Deferred Total number of successfully transmitted frames that are delayed because the medium is busy during the first attempt ...

Страница 80: ...Product Specifications 76 ...

Страница 81: ... frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at the user s own expense Changes or modifications not expressly approved by 3Com could void the user s...

Страница 82: ... based upon the standard of the Voluntary Control Council for Interference by Information Technology Equipment VCCI If this equipment is used in a domestic environment radio disturbance may occur in which case the user may be required to take corrective actions ...

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