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D-Link DSL-520B ADSL2+ Modem User Manual

Section 10 - Diagnostics

Diagnostics

The diagnostics screen allows you to run diagnostic tests to check your DSL connection. The results will show test results of two connections:

• Connection to your local network
• Connection to your DSL service provider

Click

Run Diagnostic Tests

to begin.

Summary of Contents for DSL-520B

Page 1: ......

Page 2: ... 21 LAN 21 WAN 21 ATM 22 ADSL 23 Route 24 ARP 25 DHCP 26 Advanced Setup 27 WAN 27 ATM PVC Configuration 28 Connection Type 29 PPP over Ethernet PPPoE 30 Network Address Translation Settings PPPoE 31 WAN Setup Summary PPPoE 32 DHCP 33 Network Address Translation Settings MER DHCP 34 WAN Setup Summary MER DHCP 35 Bridging 36 WAN Setup Summary Bridging 37 LAN 38 NAT 39 Port Triggering 43 DMZ Host 44 ...

Page 3: ...7 Settings 67 Backup 67 Update 68 Restore Default 69 System Log 70 System Log Configuration 71 TR 069 Client 72 Internet Time 73 Access Control Services 74 Access Control IP Address 75 Access Control Passwords 76 Update Software 77 Save and Reboot 78 Troubleshooting 79 Networking Basics 81 Check your IP address 81 Check your MAC address 81 Statically Assign an IP address 82 Contacting Technical Su...

Page 4: ...tant Safety Instructions Place your modem on a flat surface close to the cables in a location with sufficient ventilation To prevent overheating do not obstruct the ventilation openings of this equipment Plug this equipment into a surge protector to reduce the risk of damage from power surges and lightning strikes Operate this equipment only from an electrical outlet with the correct power source ...

Page 5: ...ring data transmission 3 DSL LED A solid light indicates the DSL is synchronized A flashing LED indicates the modem is attempting to synchronize with the DSL provider 4 Internet LED A solid green light indicates that the modem has an IP address and is connected to the Internet AredlightindicatesthatthemodemdoesnothaveanIPaddressorauthentication has failed No light indicates that an ADSL connection...

Page 6: ...J 11 2 LAN Port Connect Ethernet devices such as computers switches and hubs 3 Reset Pressing the Reset button for 5 seconds restores the modem to its original factory default settings 4 ON OFF Press this button to turn the unit ON or OFF 5 Power Receptor Receptor for the supplied power adapter Rear Panel View 1 2 3 4 5 ...

Page 7: ... cable from the computer directly to the modem Connect one end of the Ethernet cable to the port labeled LAN on the back of the modem and attach the other end to the Ethernet port of your computer If your LAN has more than one computer you can attach one end of an Ethernet cable to a hub or a switch and the other to the Ethernet port labeled LAN on the modem Note that either a crossover or straigh...

Page 8: ...apter Complete the process by connecting the supplied 12V 500mA power adapter to the POWER connector on the back of the device and plug the adapter into a wall outlet or power strip Then turn on and boot up your PC and any LAN devices such as hubs or switches and any computers connected to them ...

Page 9: ...9 D Link DSL 520B ADSL2 Modem User Manual Section 3 Installation Diagram Installation Diagram 5V 3A LAN LAN RESET ON OFF DSL 520B Modem Desktop Computer ...

Page 10: ...ing Your Computer Windows XP 1 In the Windows taskbar click on the Start button then go to Control Panel and then click Network Connections 2 In the Network Connections window right click on the Local Area Connection icon and click on Properties 3 Listed in the Local Area Connection window are the installed network components Make sure the box for Internet Protocol TCP IP is checked and then click...

Page 11: ...g system 1 In the Mac OS X Dock click on the System Preferences icon 2 Under Internet Network click Network In the Show menu select Built in Ethernet or Ethernet Depending on your Mac OS version 3 Click the TCP IP tab 4 In the Configure menu select Using DHCP 5 Click Apply Now and Save if your computer prompts you to save changes ...

Page 12: ...ess bar and press Enter A login screen like the one below will be displayed after you connect to the user interface 3 Enter your user name and password and then click OK to display the user interface Note Use admin admin as a default for username and password The admin account can perform all functions username password admin admin Note Passwords can be changed at any time Note This manual has bee...

Page 13: ...uter Verify the box is checked next to DSL Auto connect Please prepare your account information provided by your Internet Service Provider ISP Click Next to begin setup Note Quick Setup will allow you to configure a PPPoE connection For more information on PPPoE and other connection types please see the Advanced Setup section in this user manual ...

Page 14: ... 6 Quick Setup The router will automatically perform a PVC scan in order to detect your DSL connection If the scan is unsuccessful you must manually enter account settings For these settings please refer to your account information provided by your ISP ...

Page 15: ...User Manual Section 6 Quick Setup When the PVC scan is complete you will be prompted to enter your username and password as provided by your ISP Advanced users can configure optional settings on this page Click Next to continue setup ...

Page 16: ...16 D Link DSL 520B ADSL2 Modem User Manual Section 6 Quick Setup The router will automatically verify your username and password ...

Page 17: ...17 D Link DSL 520B ADSL2 Modem User Manual Section 6 Quick Setup This page allows you to adjust the Local Area Network settings No changes are required on this page Click Next to continue ...

Page 18: ...SL 520B ADSL2 Modem User Manual Section 6 Quick Setup Verify your settings are correct and click Save Reboot The router will save your settings and reboot itself Please do not unplug any cables during this process ...

Page 19: ...mary of your device s information is provided in this section The information will reflect your DSL s connection status The Device Info page shows details of the modem such as the version of the software bootloader LAN IP address etc It also displays the current status of your DSL connection ...

Page 20: ...r Manual Section 7 Device Info WAN TheWAN Info screen displaysWAN connections previously set up in the Home section There is an extra Status column used for connection status information displaying either ADSL Link Down or ADSL Link Up ...

Page 21: ...sectionshowsreceivedandtransmittedpacketinformation for the WAN connections that you have set up Click on Reset Statistics to renew the information The LAN section shows received and transmitted packet information for the Ethernet interface Click on Reset Statistics to renew the information ...

Page 22: ...ink DSL 520B ADSL2 Modem User Manual Section 7 Device Info ATM The ATM section displays statistical values for your ATM interface as well as for AAL5 and AAL5 VCC Click on Reset Statistics to reset the values ...

Page 23: ...23 D Link DSL 520B ADSL2 Modem User Manual Section 7 Device Info ADSL Information contained in the ADSL screen is useful for troubleshooting and diagnosing connection problems ...

Page 24: ...SL 520B ADSL2 Modem User Manual Section 7 Device Info Route The Route Info section displays route information showing the IP addresses of the destination gateway and subnet mask as well as other route information ...

Page 25: ...25 D Link DSL 520B ADSL2 Modem User Manual Section 7 Device Info ARP This section allows you to query the MAC and IP address information of the equipment attached to the modem ...

Page 26: ...pply IP settings to computers configured to automatically obtain IP settings that are connected to the router though the Ethernet port When the router is used for DHCP it becomes the default gateway for DHCP client connected to it Keep in mind that if you change the IP address of the router you must change the range of IP addresses in the pool used for DHCP on the LAN ...

Page 27: ...o proceed to the ATM PVC Configuration screen on the following page The ATM PVC Configuration screen allows you to configure an ATM PVC identifier VPI and VCI and select a service category This section of the setup is an advanced version of the quick setup If you want to make specific configurations to your modem such as creating a SNMP etc consider going through this advanced setup for a more com...

Page 28: ...equired for all DSL connection types and are provided by your ISP Service Category Use the default setting unless otherwise instructed by your ISP Enable QoS Use the default setting unless otherwise instructed by your ISP For more information about QoS see the Quality of Service section in this user manual Click Next ...

Page 29: ...over ATM IPoA Bridging PPPoE MER also referred to as DHCP and Bridging are the most common connection types in North America To set up a PPPoE MER or Bridging connection follow the instructions on the following pages of this user manual PPPoA and IPoA are more widely utilized in other regions Setup for PPPoA and IPoA are similar to PPPoE and MER respectively Encapsulation Mode Use the default sett...

Page 30: ...xtension Used by some ISPs Check with your ISP to see if it is required Use Static IP Address Select if your ISP has provided youwithastatic IPaddress Ifselected youwillbeasked to enter the static IP address Retry PPP password on authentication error Select if you want the router to automatically retry your PPP username and password when there is an authentication error on your DSL line EnablePPPD...

Page 31: ... computers Enable Firewall Select if you would like to utilize the firewall to help protect you from unwanted internet threats Enable IGMP Multicast Use the default setting unless otherwise instructed by your ISP Enable WAN Service This option is Enabled by default Deselecting this option will cause your DSL connection to be disabled Service Name Enter any name that will help you identify your con...

Page 32: ...up WAN Setup Summary PPPoE Confirm the settings on this page match the settings provided by your ISP To make any changes click Back If your settings are correct click Save Note After clicking Save you will have to reboot the modem in order to activate your connection ...

Page 33: ...ded Obtaindefaultgatewayautomatically This is the default option If your ISP has provided you with a static default gateway select Use the following default gateway Select Use IP Address and enter the default gateway that your ISP has provided Alternately you may choose to select Use WAN Interface Obtain DNS server addresses automatically This is the default option If your ISP has provided you wit...

Page 34: ...iple computers Enable Firewall Select if you would like to utilize the firewall to help protect you from unwanted Internet threats Enable IGMP Multicast Use default setting unless otherwise instructed by your ISP Enable WAN Service This option is Enabled by default Deselecting this option will cause your DSL connection to be disabled Service Name Enter any name that will help you identify your con...

Page 35: ... WAN Setup Summary MER DHCP Confirm the settings on this page match the settings provided by your ISP To make any changes click Back If your settings are correct click Save Note After clicking Save you will have to reboot the modem in order to activate your connection ...

Page 36: ...Setup Bridging Enable WAN Service This option is Enabled by default Deselecting this option will cause your DSL connection to be disabled Service Name Enter any name that will help you identify your connection This field will not affect your connection Click Next ...

Page 37: ... WAN Setup Summary Bridging Confirm the settings on this page match the settings provided by your ISP To make any changes click Back If your settings are correct click Save Note After clicking Save you will have to reboot the modem in order to activate your connection ...

Page 38: ...iguretheDSLModemIPaddressandSubnet Mask for the LAN interface The Save button only saves the LAN configuration data but does not apply the configurations Select the Save Reboot button to save the LAN configuration data then reboot the modem and apply the new configuration LAN ...

Page 39: ...wall without any problems For example if you request Internet pages or send and receive e mails the request for data from the Internet comes from a PC in the local network and so the router allows the data to pass through The router opens one specific port for the application A port in this context is an internal PC address via which the data is exchanged between the Internet and a client on a PC ...

Page 40: ...ort then it opens the assigned public ports and notes the IP address of the PC that sent the data If data comes back from the Internet via one of these public ports the router allows it to pass through and directs it to the appropriate PC A trigger event always comes from a PC within the local network If a trigger port is addressed from outside the router simply ignores it Note An application that...

Page 41: ...f your PCs you would simply select FTP from the list and enter the local IP address or host name of the designated computer All FTP related data arriving at DSL router from the Internet henceforth is forwarded to the specific computer Similarly you can grant Internet users access to servers inside your home network by identifying each service and the PC that provide it This is useful for example i...

Page 42: ... that the port is not used by another application which may stop functioning A common example is when using SIP signaling in Voice over IP the port used by the gateway VoIP application 5060 is the same port on which port forwarding is set for LAN SIP agents Note Some applications such as FTP TFTP PPTP and H323 require the support of special specific application level gateway ALG modulesinordertowo...

Page 43: ... triggering for a certain application you must determine a so called trigger port and the protocol TCP or UDP that this port uses You then assign the public ports that are to be opened for the application to this trigger port You can select known Internet services or manually assign ports or port blocks ...

Page 44: ... at risk Hence when designating a DMZ host you must consider the security implications and and take the appropriate precautions You can set up a client in your local network as a DMZ host Your device then forwards all incoming data traffic from the Internet to this client You can for example operate your ownWeb server on one of the clients in your local network and make it accessible to Internet u...

Page 45: ...ransmissions between the Internet and your PC It serves as a security gate and permits only authorized traffic to be sent to the LAN Note If the modem is configured to bridge mode only IP filtering is disabled and the IP filtering interface does not appear If the modem does not configure a PVC of Bridge mode MAC filtering is disabled and the MAC Filtering interface does not appear Security IP Filt...

Page 46: ...owed but some IP traffic can be blocked by setting up filters Click Add and the page for defining the IP filtering rule appears In this page you can create a filter rule to identify outgoing IP traffic by specifying a new filter name and at least one condition All specified conditions in the filtering rule must comply with the rule to take effect Click Save Apply to save and activate the filter ...

Page 47: ...some IP traffic can be accepted by setting up filters Click Add the following page appears In this page you can create a filter rule to identify incoming IP traffic by specifying a new filter name and at least one condition All specified conditions in this filter rule must comply with the rule Click Save Apply to save and activate the filter You should select at least one WAN interface to apply th...

Page 48: ...arded except those matching any of the specified rules in the following table Blocked means that all MAC layer frames are blocked except those matching with any of the specified rules in the following table ClickChangePolicyandthefollowingpagewillappear ThenyoucanchangetheMACFilteringGlobalPolicyfromFORWARDED to BLOCKED Readthewarninginformation ClickYestochangetheMACfilteringglobalpolicyfromForwa...

Page 49: ... add time of day restriction to a particular LAN device connected to the Router The Browser s MAC Address automatically displays the MAC address of the LAN device where the browser is running To restrict other LAN device click Other MAC Address and enter the MAC address of the another LAN device To obtain the MAC address of a Windows based PC enter ipconfig all in the DoS window ...

Page 50: ... set of standards and mechanisms for ensuring high quality performance for critical applications By using QoS mechanisms network administrators can use existing resources efficiently and ensure the required level of service without reactively expanding or over provisioning their networks Traditionally the concept of quality in networks meant that all network traffic was treated equally The result ...

Page 51: ...mentconfiguration Bydefault thesystemenablesQoSandsetsadefaultDSCPmarktoautomatically mark incoming traffic without reference to particular classifier Select Advanced Setup Quality of Service and the following page will appear Select Enable QoS to enable QoS and set the default DSCP mark Click Save Apply to activate QoS ...

Page 52: ...e A maximum of 16 entries can be configured QoS Queue Configuration can allocate four queues Each of the queues can be configured for a precedence value Lower integer values for precedence imply higher priority for this queue relative to others The queue entry configured is used by the classifier to place ingress packets appropriately Note Lower integer values for precedence imply higher priority ...

Page 53: ...ectanintegervalue thequeue entry appropriately places to ingress packets Lower integer values for precedence imply higher priority for this queue relative to others Step 2 Add a QoS queue entry and assign it to a specific network interface PVC 0 0 35 and set integer values for queue precedence to 1 See the following figure Step 3 After proper modifications click Save Apply and the following page w...

Page 54: ...tream traffic Assign queue which defines the precedence and the interface and optionally overwrite the IP header DSCP byte After QoS classification QoS divides capacity between different applications and provides undelayed continuous data transfer where data packet with higher priority is given preference Click QoS Classification and the following page will appear In this page you can configure ne...

Page 55: ...ice that modifies the original packet IP headerifallrulesdefinedwithintheclassificationclassare matched CS MarkIPPrecedence AF AssuredForwarding EF Expedited Forwarding Mark802 1pif802 1qisEnabled Selectan802 1ppriority number that serves as the 802 1p value There are two sets of classification rules Set 1 is based on different fields withinTCP UDP IP layer plus physical LAN port Set 2 is based on...

Page 56: ...ource Port Destination IP Address Destination Subnet Mask UPD TCP Destination Port or a Range of Ports Source Mac Address Source Mac Mask Destination Mac Address Destination Mac Mask Set 2 Rules contain the following 802 1p Priority the 802 1p header includes a 3 bit prioritization field which allows packets to be grouped into eight levels of priority 0 7 where level 7 is the highest one ...

Page 57: ...e specifically marked allowing network nodes to provide different levels of service via priority queuing or bandwidth allocation or by choosing dedicated routes for specific traffic flows As displayed in following diagram the IPV4 packet has a TOS field Diffserv defines TOS field in IP packet headers referred to as DSCP Hosts or routes that pass traffic to a Diffserv enabled network typically mark...

Page 58: ...y thisroutercanacceptthefirstreceived default gateway assignment from one of the PPPoA PPPoE or MER DHCP enabled PVC s If the check box is not selected you must enter the static default gateway and or a WAN interface Then click Save Apply Note IftheAutomaticAssignedDefaultGatewaycheck box is changed from deselected to selected you must reboot the router to obtain the automatic assigned default gat...

Page 59: ...static route information Destination The IP address to which packets are transmitted Subnet Mask The subnet mask of the destination IP address Gateway The gateway that the packets pass by during transmission Interface The interface that the packets pass through on the modem Click Add and the following page will appear Enter the destinationnetworkaddress subnetmask gatewayAND OR availableWAN interf...

Page 60: ...he Enabled radio button for Global RIP Mode To configure an individual interface select the desired RIP version and operation followed by placing a check in the Enabled checkbox for the interface Click the Save Apply button to save the configuration and to start or stop RIP based on the Global RIP mode selected ...

Page 61: ...ted this router accepts the first received DNS assignment from one of the PPPoA PPPoE or MER DHCP enabled PVC s during the connection establishment If the checkbox is not selected enter the primary and secondary optional DNS server IP addresses The interface is as follows Click Save to save the new configuration Note You must reboot the router to make the new configuration take effect ...

Page 62: ...odify the Dynamic DNS settings The Dynamic DNS service allows you to alias a dynamic IP address to a static hostname in any of the many domains allowing your DSL router to be more easily accessed from various locations on the Internet Click Add to add Dynamic DNS Enter your information in the spaces provided and click Save ...

Page 63: ...n 9 Advanced Setup DSL The DSL settings page contains modulation and capability settings Consult your ISP to determine the correct settings Click Apply if you are finished or click on Advanced Settings if you want to configure other advanced settings ...

Page 64: ...es as if 256 separate modems were running in parallel The tone range is from 0 to 31 for upstream and from 32 to 255 for downstream Do not change these settings unless directed by your ISP The test mode can be selected from the ADSL Advanced Settings page Test modes include normal reverb medley no retrain and L3 After you make your selection click on Apply to save these settings first before you g...

Page 65: ...0B ADSL2 Modem User Manual Section 9 Advanced Setup MAC Clone This page allosw you to clone the MAC address on your router This is needed when adding a router to your network in order to share your internet connection ...

Page 66: ...cs Diagnostics The diagnostics screen allows you to run diagnostic tests to check your DSL connection The results will show test results of two connections Connection to your local network Connection to your DSL service provider Click Run Diagnostic Tests to begin ...

Page 67: ...ion to a file on your computer so that it may be accessed again later This feature is useful if you have changed the configuration on the router but would like to revert to a previous configuration To save your current configuration click the Backup Settings button The following pop up screen will appear with a prompt to open or save the file to your computer ...

Page 68: ...ction 11 Management Update To load a previously saved configuration file onto your router click Browse select the file on your computer and then click on Update Settings The router will restore settings and reboot to activate the restored settings ...

Page 69: ...store Default Settings will delete all current settings and restore the router to factory default settings Click on the Restore Default Settings button to proceed The following confirmation dialog will appear confirming your decision to restore default settings Click on OK to continue ...

Page 70: ...interface You can enable or disable the system log and then select the Log Level Display Level and Mode and click Apply to end your configurations Both the log level and display level have eight choices The default log level is Debugging and the default display level is Error The mode options are Local Remote and Both The default is Local If you select Remote or Both all events are transmitted to ...

Page 71: ...evel Display Level and Mode If the selected mode is Remote or Both events will be sent to a specified IP address and UDP port of a remote system log server If the selected mode is Local or Both events will be recorded and viewed locally Select the desired values and click Apply to save the system log options System Log Configuration ...

Page 72: ...ows a Auto Configuration Server ACS to perform auto configuration provision collection and diagnostics to this device If you wish to enable this protocol then select enable Contact your ISP to determine the ACS URL ACS User Name and ACS Password You must click on the Save Reboot button for the change to take place ...

Page 73: ...hronize your time with a time server on the Internet To set the modem s time click on the automatically synchronize with Internet time servers checkbox Additional time settings will appear below the checkbox Select from the list of NTP Network Time Protocol time servers Then select the time zone that you are in and click Apply to save ...

Page 74: ... are FTP HTTP ICMP SNMP Telnet and TFTP FTP HTTP ICMP Telnet TFTP File Transfer Protocol Used for file transfer HyperTextTransfer Protocol A communications protocol that enables Web browsing Internet Control Message Protocol supports packets containing error control and informational messages AstandardInternetprotocolforaccessingremote systems Trivial File Transfer Protocol A very simple form of t...

Page 75: ...dd button then select Enabled to enable Access Control Mode Enter the IP address of the management station permitted to access the local configuration and click Apply This will return you to the previous screen where you can enable access control IfAccessControlModeisdisabled anyworkstationconnected locally to your modem can access the web interface provided the correct username and password is su...

Page 76: ...User Admin has unrestricted access to change and view configuration Support is used to allowed an ISP technician to access your DSL router for maintenance and to run diagnostics For User the user name can access the DSL router to view configuration settings statistics and update router s software To change or create passwords use the fields below and enter up to 16 characters ...

Page 77: ...DSL 520B ADSL2 Modem User Manual Section 11 Management Update Software You can update your software through this screen Follow the screen s steps Select Browse to search for your software file and Update Software ...

Page 78: ...anual Section 11 Management Save and Reboot When clicking the Save Reboot button it will save all configuration changes made on the modem and restart the device All new configuration settings will take effect when the modem starts up again ...

Page 79: ...t The device has the utility built in to a ROM chip in the device itself Your computer must be on the same IP subnet to connect to the web based utility Make sure you have an updated Java enabled web browser We recommend the following Internet Explorer 6 0 or higher Firefox 3 0 or higher Verify physical connectivity by checking for solid link lights on the device If you do not get a solid link lig...

Page 80: ...r D Link modem in the address bar This should open the login page for your the web management If you still cannot access the configuration unplug the power to the modem for 10 seconds and plug back in Wait about 30 seconds and try accessing the configuration If you have multiple computers try connecting using a different computer 2 What can I do if I forgot my password If you forgot your password ...

Page 81: ... gateway of your adapter Iftheaddressis0 0 0 0 checkyourdeviceinstallation securitysettings and the settings on your modem Some firewall software programs may block a DHCP request on newly installed device If you are connecting to a wireless network at a hotspot e g hotel coffee shop airport please contact an employee or administrator to verify their wireless network settings Check your MAC addres...

Page 82: ...erties Step 3 Highlight Internet Protocol TCP IP and click Properties Step 4 Click Use the following IP address and enter an IP address that is on the same subnet as your network or the LAN IP address on your modem Example If the modem s LAN IP address is 192 168 1 1 make your IP address 192 168 1 X where X is a number between 2 and 99 Make sure that the number you choose is not in use on the netw...

Page 83: ...e g DSL 520B Hardware Revision located on the label on the bottom of the modem e g rev T1 Serial Number s n number located on the label on the bottom of the modem You can find software updates and user documentation on the D Link website as well as frequently asked questions and answers to technical issues For customers within the United States Phone Support 877 453 5465 Internet Support http supp...

Page 84: ...etermines is substantially equivalent or superior in all material respects to the defective Hardware Repaired or replacement hardware will be warranted for the remainder of the originalWarranty Period or ninety 90 days whichever is longer and is subject to the same limitations and exclusions If a material defect is incapable of correction or if D Link determines that it is not practical to repair ...

Page 85: ...D Link as outlined below The customer must submit with the product as part of the claim a written description of the Hardware defect or Software nonconformance in sufficient detail to allow D Link to confirm the same along with proof of purchase of the product such as a copy of the dated purchase invoice for the product if the product is not registered ThecustomermustobtainaCaseIDNumberfromD LinkT...

Page 86: ...OEVER INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT IF ANY IMPLIED WARRANTY CANNOT BE DISCLAIMED IN ANY TERRITORY WHERE A PRODUCT IS SOLD THE DURATION OF SUCH IMPLIEDWARRANTY SHALL BE LIMITEDTOTHE DURATION OFTHE APPLICABLEWARRANTY PERIOD SET FORTH ABOVE EXCEPT AS EXPRESSLY COVERED UNDERTHE LIMITEDWARRANTY PROVIDED HEREIN THE ENTI...

Page 87: ...omply with the 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 and if not installed and used in accordance with the instructions may cause harmful interference to radio communication Howev...

Page 88: ...520B ADSL2 Modem User Manual Appendix D Registration Version 1 0 July 29 2010 Product registration is entirely voluntary and failure to complete or return this form will not diminish your warranty rights Registration ...

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