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PC Configuration

Figure 22 - Windows NT4.0 - Add Gateway

2. The DNS should be set to the address provided by your ISP, as follows:

Click the DNS tab.

On the DNS screen, shown below, click the

Add

button (under

DNS Service

Search Order

), and enter the DNS provided by your ISP.

Figure 23: Windows NT4.0 - DNS

Содержание ADSL 2/2+ VPN Firewall Router ADE-4300A/B

Страница 1: ...ADSL 2 2 VPN Firewall Router ADE 4300A B ADW 4300A B User s Manual...

Страница 2: ...ntial 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 interfer ence to radio commu...

Страница 3: ...h Station Equipment As of April 8 2000 Safety This equipment is designed with the utmost care for the safety of those who install and use it However special attention must be paid to the dangers of el...

Страница 4: ......

Страница 5: ...ts 26 Macintosh Clients 37 Linux Clients 37 Other Unix Systems 37 Wireless Station Configuration ADW 4300 only 38 Wireless Configuration on Windows XP ADW 4300 only 38 CHAPTER 5 OPERATION AND STATUS 4...

Страница 6: ...111 Overview 111 General Problems 111 Internet Access 111 Wireless Access ADW 4300 only 112 APPENDIX B ABOUT WIRELESS LANS ADW 4300 ONLY 114 Modes 114 BSS ESS 114 Channels 115 WEP 115 WPA PSK 115 Wire...

Страница 7: ...et 4 Port Switching Hub for 10BaseT or 100BaseT connections Figure 1 ADE 4300 ADW 4300 ADE 4300 ADW 4300 Features The ADE 4300 ADW 4300 incorporates many advanced features carefully designed to provid...

Страница 8: ...irable Web sites by LAN users Logs Define what data is recorded in the Logs and optionally send log data to a Syslog Server Log data can also be E mailed to you Access Control Allows administrators to...

Страница 9: ...es a 4 port 10 100BaseT switching hub making it easy to create or extend your LAN DHCP Server Support Dynamic Host Configuration Protocol provides a dynamic IP address to PCs and other devices upon re...

Страница 10: ...ed and all incoming server re quests are filtered thus protecting your network from malicious attacks from external sources Protection against DoS attacks DoS Denial of Service attacks can flood your...

Страница 11: ...following items should be included If any of these items are damaged or missing please contact your dealer immediately The ADE 4300 ADW 4300 Unit Quick Installation Guide User s Manual CD Power Adapt...

Страница 12: ...s using 100BaseT and Blinking if data is being transferred via the cor responding LAN port 10 LNK ACT This will be ON if the LAN connection is using 10BaseT and Blinking if data is being transferred v...

Страница 13: ...then release the Reset Button and wait the ADE 4300 ADW 4300 to restart using the factory default values POWER port Connect the supplied power adapter here 10 100BaseT LAN connec tions Use standard L...

Страница 14: ...ccess Point all Wireless devices must be compliant with the IEEE 802 11g or IEEE 802 11b specifications ADW 4300 only Procedure Figure 6 Installation Diagram Antenna for ADW 4300 only 1 Choose an Inst...

Страница 15: ...minator provided by your phone com pany 4 Power Up Connect the supplied power adapter to the ADE 4300 ADW 4300 Use only the power adapter provided Using a different one may cause hardware damage Power...

Страница 16: ...00 ADW 4300 you wish to use Use the table below to locate detailed instructions for the required functions To Do this Refer to Configure PCs on your LAN Chapter 4 PC Configuration Check ADE 4300 ADW 4...

Страница 17: ...same LAN segment The ADE 4300 ADW 4300 must be installed and powered ON If the ADE 4300 ADW 4300 s default IP Address 192 168 0 1 is already used by another device the other device must be turned OFF...

Страница 18: ...uration for details on checking your PC s TCP IP settings Ensure that your PC and the ADE 4300 ADW 4300 are on the same network segment If you don t have a router this must be the case Ensure you are...

Страница 19: ...y b IP Address allocated to you and related information such as Network Mask Gateway IP address and DNS address PPPoE PPPoA You connect to the ISP only when required The IP address is usually allocate...

Страница 20: ...n menu also contains two 2 buttons Log Out When finished you should click this button to logout Restart Use this if you wish to restart the ADE 4300 ADW 4300 Note that re starting the Router will brea...

Страница 21: ...HCP Server If Enabled the ADE 4300 ADW 4300 will allocate IP Ad dresses to PCs DHCP clients on your LAN when they start up The default and recommended value is Enabled If you are already using a DHCP...

Страница 22: ...n the LAN screen On this screen you can Enable or Disable the ADE 4300 ADW 4300 s DHCP Server function Set the range of IP Addresses allocated to PCs by the DHCP Server function You can assign Fixed I...

Страница 23: ...low Figure 9 Wireless Screen Data Wireless Screen Identification Region Select the correct domain for your location It is your responsibil ity to ensure That the ADW 4300 is only used in domains for w...

Страница 24: ...shown by lost connections and or slow data transfers you may need to experiment with different channels to see which is the best If using multiple Access Points adjacent Access Points should use diffe...

Страница 25: ...d Wireless stations only Only wireless stations you designate as Trusted can use the Access Point even if they have the correct SSID and security settings This feature uses the MAC address to identify...

Страница 26: ...ption and ensure the Wireless Stations use the same setting 64 Bit data is encrypted using the default key before being transmitted You must enter at least the default key For 64 Bit Encryption the ke...

Страница 27: ...K Data WPA PSK Screen Security System WPA PSK Like WEP data is encrypted before transmission WPA is more secure than WEP and should be used if possible WPA PSK is the version of WPA which does NOT req...

Страница 28: ...Trusted Other Wireless Stations This list any Wireless Stations detected by the Access Point which you have not designated as Trusted Name The name assigned to the Trusted Wireless Station Use this wh...

Страница 29: ...field and the Add button will change to Update 3 Edit the address MAC or physical address as required 4 Click Update to save your changes Add Update To add a Trusted Station which is not in the Other...

Страница 30: ...ter the existing password in this field New password Enter the new password here Verify pass word Re enter the new password here You will be prompted for the password when you connect as shown below F...

Страница 31: ...Server on your LAN to provide IP addresses to the Wireless clients using this Access Point ADW 4300 All traffic received on either the Wireless ADW 4300 or LAN interface will be sent over the ADSL con...

Страница 32: ...lled and configured on each PC TCP IP Settings Overview If using the default ADE 4300 ADW 4300 s settings and the default Win dows TCP IP settings no changes need to be made By default the ADE 4300 AD...

Страница 33: ...Figure 17 IP Address Win 95 Ensure your TCP IP settings are correct as follows Using DHCP To use DHCP select the radio button Obtain an IP Address automatically This is the default Windows setting Us...

Страница 34: ...r LAN administrator can advise you of the IP Address they assigned to the ADE 4300 ADW 4300 Figure 18 Gateway Tab Win 95 98 On the DNS Configuration tab ensure Enable DNS is selected If the DNS Server...

Страница 35: ...ng TCP IP Settings Windows NT4 0 1 Select Control Panel Network and on the Protocols tab select the TCP IP protocol as shown below Figure 20 Windows NT4 0 TCP IP 2 Click the Properties button to see a...

Страница 36: ...rver Restart your PC to ensure it obtains an IP Address from the ADE 4300 ADW 4300 Specify an IP Address If your PC is already configured check with your network administrator before making the follow...

Страница 37: ...Gateway 2 The DNS should be set to the address provided by your ISP as follows Click the DNS tab On the DNS screen shown below click the Add button under DNS Service Search Order and enter the DNS pr...

Страница 38: ...n 2 Right click the Local Area Connection icon and select Properties You should see a screen like the following Figure 24 Network Configuration Win 2000 3 Select the TCP IP protocol for your network c...

Страница 39: ...ddress from the ADE 4300 ADW 4300 Using a fixed IP Address Use the following IP Address If your PC is already configured check with your network administrator before making the following changes Enter...

Страница 40: ...ork Connection 2 Right click the Local Area Connection and choose Properties You should see a screen like the following Figure 26 Network Configuration Windows XP 3 Select the TCP IP protocol for your...

Страница 41: ...ns an IP Address from the ADE 4300 ADW 4300 Using a fixed IP Address Use the following IP Address If your PC is already configured check with your network administrator before making the following cha...

Страница 42: ...and Internet Connections 2 Select Set up or change your Internet Connection 3 Select the Connection tab and click the Setup button 4 Cancel the pop up Location Information screen 5 Click Next on the...

Страница 43: ...hanges Fixed IP Address By default most Unix installations use a fixed IP Address If you wish to continue using a fixed IP Address make the following changes to your configuration Set your Default Gat...

Страница 44: ...urity By default Wireless security on the ADW 4300 is disabled If Wireless security remains disabled on the ADW 4300 all stations must have wireless security disabled If Wireless security is enabled o...

Страница 45: ...ing section If the SSID is not listed for details of dealing with this situation 4 The next step depends on whether or not Wireless security has been enabled on the ADW 4300 If Wireless Security is Di...

Страница 46: ...using WEP Data Encryption If WEP data encryption has been enabled on the ADW 4300 Windows will detect this and show a screen like the following Figure 31 WEP Windows XP To connect Enter the WEP key as...

Страница 47: ...and click Configure to see a screen like the fol lowing Figure 33 Wireless Network Properties WEP Configure this screen as follows Set Network Authentication to match theADW 4300 If the setting on th...

Страница 48: ...must match the default key index on the ADW 4300 The default value is 1 Ensure the options The key is provided for me automatically and This is a com puter to computer ad hoc network are unchecked Cl...

Страница 49: ...it does not matter which network is selected on the screen below Just click the Advanced button Figure 35 Wireless Networks Windows XP You will then see a screen like the example below Figure 36 Adva...

Страница 50: ...on to WPA PSK For Data Encryption select TKIP For the Network key and Confirm network key enter the network key PSK used on the ADW 4300 Ensure the option This is a computer to computer ad hoc network...

Страница 51: ...d If the Broadcast SSID setting on the ADW 4300 has been disabled its SSID will NOT be listed on the screen below Figure 39 Wireless Networks Windows XP In this situation you need to obtain the SSID f...

Страница 52: ...e a screen like the example below Figure 41 Add Wireless Network 3 Configure this screen as follows Enter the correct SSID as used on the ADW 4300 Remember the SSID is case sensitive so be sure to mat...

Страница 53: ...ails of WEP and WPA PSK Uncheck the options The key is provided for me automatically and This is a com puter to computer ad hoc network Click OK to save and exit 4 This wireless network will then be l...

Страница 54: ...m mode see Chapter 8 Modem Mode Operation Router Mode Once both the ADE 4300 ADW 4300 and the PCs are configured operation is automatic However there are some situations where additional Internet conf...

Страница 55: ...indicates the status of the ADSL modem component DownStream Connection Speed Displays the speed for the DownStream Connection UpStream Connection Speed If connected displays the speed for the Up Stre...

Страница 56: ...to open a sub window and view a detailed description of the current connection Depending on the type of connection a log may also be available LAN IP Address The IP Address of the ADE 4300 ADW 4300 N...

Страница 57: ...howing all LAN and Wireless devices currently on the network VPN Status View details of each current VPN Tunnel is a sub window You also have the option of viewing the VPN Log For further details abou...

Страница 58: ...s currently established If the connection does not exist the Connect button can be used to establish a connection If the connection currently exists the Disconnect button can be used to break the conn...

Страница 59: ...mote Gateway or Router associated with the IP Address above DHCP Server The IP address of your ISP s DHCP Server DNS Server The IP address of the Domain Name Server which is currently used Lease Obtai...

Страница 60: ...tion Details Fixed Dynamic IP Address Data Fixed IP address Screen Internet IP Address The IP Address of this device as seen by Internet users This address is allocated by your ISP Internet Service Pr...

Страница 61: ...DMZ Special Applications URL filter Dynamic DNS Firewall Rules Firewall Services Schedule Virtual Servers VPN SNMP Access Control The Access Control feature allows administrators to restrict the Inte...

Страница 62: ...Default Schedule to apply the blocking only during scheduled times If access is not blocked no Scheduling is possible and this setting has no effect None Schedule is disabled Default Use the schedule...

Страница 63: ...ove from the Other PCs list Select an entry or entries in the Other PCs list and click the button Delete a Trusted PC from the list move to the Other PCs list Select an entry or entries in the Trusted...

Страница 64: ...DMZ feature when required Special Applications If you use Internet applications which use non standard connections or port numbers you may find that they do not function correctly because they are blo...

Страница 65: ...r for data you receive If the application uses a single port number enter it in both the Start and Finish fields Finish Enter the end of the range of port numbers used by the application server for da...

Страница 66: ...e time independent of the Schedule page Allow Trusted PCs to Visit Blocked Sites Enable this to allow specified com puter s to have unrestricted access to the Internet For this these PC s the URL filt...

Страница 67: ...trings The list contains the current list of items to block To add to the list use the Add option below To delete an entry select it and click Delete button To delete all entries click the Delete All...

Страница 68: ...desired Domain name 3 Enter your DDNS data on the ADE 4300 ADW 4300 s DDNS screen and enable the DDNS feature 4 The ADE 4300 ADW 4300 will then automatically ensure that your current IP Address is re...

Страница 69: ...dress Password Enter your current password for the DDNS Service TZO com calls this a key Domain Name Enter the domain name allocated to you by the DDNS Service If you have more than one name enter the...

Страница 70: ...Firewall Screen Data Firewall Rules Incoming Rules For the default rule this will display Default For rules which you create this will display a radio button which allows you to select the rule Enable...

Страница 71: ...the rule is currently enabled For rules you have added this column will contain a checkbox allowing you to easily enable or disable the rule Click Save after making any changes Service Name The Servic...

Страница 72: ...ock BLOCK always BLOCK by schedule otherwise Allow Note Any inbound traffic which is not allowed by rules you create will be blocked by the Default rule BLOCK rules are only useful if the traffic is a...

Страница 73: ...matches this rule The action is determined by this rule Not Match Log traffic which is considered by this rule but does not match The action is NOT determined by this rule Outgoing Rules Outbound Serv...

Страница 74: ...er on your LAN which will be covered by this rule WAN Users These settings determine which packets are covered by the rule based on their source WAN IP address Select the desired option Any All IP add...

Страница 75: ...creen Data Firewall Services Services Existing Ser vices This lists any Services you have defined If you have not de fined any Services this list will be empty Once you define some services they will...

Страница 76: ...Service Data Add Edit Service Services Name If editing this shows the current name of the Service If adding a new service this will be blank and you should enter a suitable name Type Select the protoc...

Страница 77: ...Disabling this option provides a slight increase in security MTU Size Enter a value between 1 and 1500 Note MTU Maximum Transmission Unit size should only be changed if advised to do so by Technical...

Страница 78: ...ession 2 can be left blank if not required Start Time Enter the start using a 24 hr clock Finish Time Enter the finish time using a 24 hr clock Local Time Time Zone In order to display your local time...

Страница 79: ...as the primary NTP server check the checkbox Use this NTP Server and enter the Server s IP address in the fields provided If this setting is not enabled the default NTP Servers are used Current Time T...

Страница 80: ...t protocols To Internet users all virtual Servers on your LAN have the same IP Address This IP Address is allocated by your ISP This address should be static rather than dynamic to make it easier for...

Страница 81: ...PC Server Select the PC for this Server The PC must be running the appropriate Server software For each entry the PC must be running the appropri ate Server software If the desired Server type is not...

Страница 82: ...ADE 4300 ADW 4300 User Guide 76 From the Internet ALL Virtual Servers have the IP Address allocated by your ISP...

Страница 83: ...to create one policy for each site you wish to connect to The remote VPN Gateway or client needs to have matching configuration Traffic covered by an enabled policy will automatically be sent via a VP...

Страница 84: ...AN IP address or subnet on your local LAN Traffic must be from or to these addresses to be cov ered by this policy Remote LAN IP address or subnet on the remote LAN Traffic must be to or from these ad...

Страница 85: ...Poli cies screen or when you edit an existing Auto Policy It allows you to define or edit an Auto VPN policy An Auto VPN policy uses the IKE Internet Key Protocol to exchange and negotiate parameters...

Страница 86: ...as follows Single address Enter an IP address in the IP address field Typically this setting is used when you wish to make a single Server on your LAN available to remote users Subnet address Enter an...

Страница 87: ...esired option to match the Local Identity Type setting on the remote VPN endpoint IP Address The Internet IP address of the remote VPN endpoint Fully Qualified Domain Name the Domain name of the remot...

Страница 88: ...Also even if one key is broken subsequent keys are no easier to break Each key has no relationship to the previous key This setting applies to both IKE and IPSec SAs When con figuring the remote endp...

Страница 89: ...s no negotiation between the 2 VPN endpoints Figure 62 VPN Manual Policy Screen Data VPN Manual Policy Screen General Policy Name Enter a unique name to identify this policy This name is not supplied...

Страница 90: ...subnet Select this option if there is no LAN only a single PC at the remote endpoint If this option is selected no additional data is required Single address Enter an IP address in the IP address fie...

Страница 91: ...Authentication Select the desired Authentication Algorithm and enter the key in the field provided For MD5 the key should be 16 ASCII characters 32 Hex characters For SHA 1 the key should be 20 ASCII...

Страница 92: ...mber to identify the incom ing connection For Auto policies the SPI is automatically generated For Manual policies the SPI must be entered when the policy is configured SPI Out This is a unique index...

Страница 93: ...ed on the main menu then SNMP to see a screen like the following Figure 64 SNMP Screen Data SNMP Screen SNMP Service Enable SNMP support Enable or disable the SNMP feature as required SNMP Data Commun...

Страница 94: ...when you select the DMZ PC or a Virtual Server This database is maintained automati cally but you can add and delete entries for PCs which use a Fixed Static IP Address Config File Backup or restore t...

Страница 95: ...Database screen is shown below Figure 65 PC Database PCs which are DHCP Clients are automatically added to the database and updated as required By default non Server versions of Windows act as DHCP Cl...

Страница 96: ...or not powered On you will not be able to add it Buttons Add This will add the new PC to the list The PC will be sent a ping to determine its hardware address If the PC is not available not connected...

Страница 97: ...is matches the PC s hostname IP Address Select the appropriate option Automatic The PC is set to be a DHCP client Windows Obtain an IP address automatically The ADE 4300 ADW 4300 will allocate an IP a...

Страница 98: ...of this the MAC address can NOT be left blank Buttons Add as New Entry Add a new PC to the list using the data in the Properties box If Automatic discovery for MAC address is selected the PC will be...

Страница 99: ...igure 67 Config File Screen Data Config File Screen Backup Config Use this to download a copy of the current configuration and store the file on your PC Click Download to start the download Restore Co...

Страница 100: ...ADW 4300 log data can also be E mailed to your PC Use the E mail screen to configure this feature Figure 68 Logging Screen Data Logging Screen Logs Current Time The current time on the ADE 4300 ADW 43...

Страница 101: ...will log connections TO this Router rather than through this Router to the Internet Router operation If checked other Router operations not covered by the selections above will be logged Known DoS at...

Страница 102: ...ddress Outgoing SMTP Mail Server Enter the address or IP address of the SMTP Simple Mail Transport Protocol Server you use for outgoing E mail My SMTP Mail Server requires authentication To stop spann...

Страница 103: ...ired option for sending the log by E mail Never default This feature is disabled Logs are not sent When log is full The time is not fixed The log will be sent when the log is full which will depend on...

Страница 104: ...at case wait a few seconds and try again Ping Button After entering the IP address click this button to start the Ping procedure The results will be displayed in the Ping Results pane DNS Lookup Inter...

Страница 105: ...ber Enter a port number between 1 and 65535 The default for HTTP Web connections is port 80 but using port 80 will prevent the use of a Web Virtual Server on your LAN So using a different port number...

Страница 106: ...r HTTP followed by the Internet IP Address of the ADE 4300 ADW 4300 If the port number is not 80 the port number is also re quired After the IP Address enter followed by the port number e g HTTP 123 1...

Страница 107: ...300 and ensure the following Windows 2000 settings are correct Open Routing and Remote Access In the console tree select Routing and Remote Access server name IP Rout ing RIP In the Details pane right...

Страница 108: ...ed in the list is ignored and has no effect Edit Update the current Static Routing Table entry using the data shown in the table area on screen Delete Delete the current Static Routing Table entry Sav...

Страница 109: ...with the exception of the Gateway IP Address For a router with a direct connection to the ADE 4300 ADW 4300 s local Router the Gateway IP Address is the address of the ADE 4300 ADW 4300 s local router...

Страница 110: ...rd Class C Gateway IP Address 192 168 0 100 Metric 3 For Router A s Default Route Destination IP Address 0 0 0 0 Network Mask 0 0 0 0 Gateway IP Address 192 168 0 1 ADE 4300 ADW 4300 s IP Address For...

Страница 111: ...llowing Figure 74 Router Upgrade Screen To perform the Firmware Upgrade 1 Click the Browse button and navigate to the location of the upgrade file 2 Select the upgrade file Its name will appear in the...

Страница 112: ...de the IP address does not change but the DHCP server is disabled However your PC will usually retain the IP address provided by the DHCP Server so the connection will be automatically re established...

Страница 113: ...change back to Router mode if desired LAN set IP address mask and gateway This is the same as in Router mode except that the DHCP server is not available while in Modem mode Wireless ADW 4300 only thi...

Страница 114: ...nsparent it does not perform any operations or make any changes to the network traffic passing through it You need to have a DHCP Server on your LAN to provide IP addresses to the Wireless cli ents us...

Страница 115: ...name of the Router This name is also the hostname for users with an Home type connection Firmware Version The version of the current firmware installed ADSL Modem Status This indicates the status of...

Страница 116: ...nded Service Set with multiple access points this ID is called an ESSID Extended Service Set Identifier Region The current region as set on the Wireless screen Channel This shows the Channel currently...

Страница 117: ...that it is using an IP Address within the range 192 168 0 2 to 192 168 0 254 and thus compatible with the ADE 4300 ADW 4300 s default IP Ad dress of 192 168 0 1 Also the Network Mask should be set to...

Страница 118: ...less station should also have WEP disabled If WEP is enabled on the ADW 4300 your PC must have WEP enabled and the key must match If the ADW 4300 s Wireless screen is set to Allow Trusted PCs only the...

Страница 119: ...Appendix A Troubleshooting 113 wireless stations This will mean high access speed is only possi ble when close to the ADW 4300...

Страница 120: ...mmunicate only with Wireless Stations which are set to Infrastructure mode BSS ESS BSS A group of Wireless Stations and a single Access Point all using the same ID SSID form a Basic Service Set BSS Us...

Страница 121: ...om receiving any data which is transmitted by your Wireless Stations But if the data is encrypted then it is meaningless unless the receiver can decrypt it If WEP is used the Wireless Stations and the...

Страница 122: ...o connect to Alternatively the SSID can be set to any or null blank to allow connection to any Access Point Wireless Security The Wireless Stations and the Access Point must use the same settings for...

Страница 123: ...nection There are two security modes possible with IPSec Transport Mode the payload data part of the packet is encapsulated through encryption but the IP header remains in the clear unchanged The ADE...

Страница 124: ...o have multiple Policies for the same remote site However you should only Enable one 1 policy at a time VPN Configuration The general rule is that each endpoint must have matching Policies as follows...

Страница 125: ...ion since it is not acting as a VPN endpoint Client PC to VPN Gateway Figure 79 Client PC to VPN Server In this situation the PC must run appropriate VPN client software in order to connect via the In...

Страница 126: ...when a VPN tunnel will be established and what systems on the remote LAN can be accessed once the VPN connection is established It is possible to have simultaneous VPN connections to many remote sites...

Страница 127: ...Appendix C VPNs 121 Configuration Settings Gateway A Gateway A should be configured as shown below Figure 82 Gateway A Configuration...

Страница 128: ...ration Settings Gateway B Gateway B should be configured as shown below Figure 83 Gateway B Configuration Settings Setting LAN A Gateway LAN B Gateway Notes Policy Name Example Example Name does not a...

Страница 129: ...n Mode Main Mode Must match DH Group Group 2 1024 bit Group 2 1024 bit Must match Local Identity IP address IP address IP address is the most common ID method Remote Identity WAN IP address WAN IP add...

Страница 130: ...P over ATM LLC VCMUX AAL and ATM Support Integrated ATM AAL5 support 255 VPI plus 65535 VCI address range LAN 4 10Base T 100Base TX Auto Negotiation Auto MDI MDI X Wire less ADW 4300 only 1 x 802 11g...

Страница 131: ...face ADW 4300 only Standards IEEE802 11b IEEE802 11g WLAN 802 11G plus Texas Instruments proprietary enhanced mode Frequency 2 4 to 2 4835GHz Industrial Scientific Medical Band Channels Maximum 14 Cha...

Страница 132: ...radio TV technician for help To assure continued compliance any changes or modifications not expressly ap proved by the party responsible for compliance could void the user s authority to operate thi...

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