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Zte ZXDSL-531B User Manual

Zte ZXDSL-531B User Manual

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ZXDSL-531B ADSL Router
User's Manual
Rev:01
2003/05/27

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Summary of Contents for Zte ZXDSL-531B

  • Page 1 ZXDSL-531B ADSL Router User’s Manual Rev:01 2003/05/27...
  • Page 2 No part of this publication may be reproduced in any form by any means without the prior written permission. Other trademarks or brand names mentioned herein are trademarks or registered trademarks of their respective companies. 2003/05/27 Rev:01 000300ies-rta...
  • Page 3 ADSL Router User Manual Safety Notes For Installation Use only the type of power source indicated on the marking labels. Use only the power adapter supplied with the product. Do not overload wall outlet or extension cords as this may increase the risk of electric shock or file. If the power cord is frayed, replace it with a new one.

  • Page 4: Table Of Contents

    Contents Contents Before You Use ....................vi Features....................vi System Requirements ................vii Unpacking ....................vii Subscription for ADSL Service ..............viii Chapter 1: Overview ..................1 Physical Outlook ..................1 Front Panel..................1 Rear Panel..................2 Chapter 2: Installation..................3 Choosing a place for the ADSL Router ............3 Connecting the ADSL Router ...............3 Chapter 3: Connection Mode ................
  • Page 5 Contents Using Web-Based Manager ............... 32 Outline of Web Manager..............32 To Have the New Settings Take Effect..........33 Quick start....................33 System ....................34 Device Information................. 34 Administration ................34 Backup Configuration..............36 Save Configuration ................. 36 Upgrade Software ................36 Reset Router .................

  • Page 6: Before You Use

    Before You Use Thank you for choosing the Asymmetric Digital Subscriber Line (ADSL) Router. With the asymmetric technology, this device runs over standard copper phone lines and provides a downstream rate at up to 8 Mbps and upstream rate at up to 1 Mbps. In addition, ADSL allows you to have both voice and data services in use simultaneously all over one phone line.

  • Page 7: Security Features

    Before You Use ARP Proxy Security Features PAP (RFC1334), CHAP (RFC1994) for PPP session Firewall support IP packets filtering based on IP address/Port number/Protocol type and TCP code field flags Intrusion Detection provides protection from a number of attacks (such as SYN/FIN/RST Flood, Smurf, WinNuke, Echo Scan, Xmas Tree Scan, etc) WEP (Wired Equivalent Privacy) encryption uses RC4 with 64/128 bit key length (for wireless ADSL router only) Wireless LAN Features...

  • Page 8: Subscription For Adsl Service

    ADSL Router User Manual Power Adapter and Cord RJ-11 ADSL Line Cable RJ-45 Ethernet Cable Quick Start Guide Depending on the service type your vendor offers, you may be provide with the devices below: Splitter (for G.dmt version) Micro filter (for G.lite version) Subscription for ADSL Service To use the ADSL Router, you have to subscribe for ADSL service from your broadband service provider.

  • Page 9: Chapter 1: Overview

    Chapter 1: Overiew Physical Outlook The following illustration shows the front panel of the ADSL Router: LED Indicators The ADSL Router is equipped with LEDs on the front panel as described in the table below (from left to right): Color Status Description Green...

  • Page 10: Rear Panel

    ADSL Router User Manual The following figure illustrates the rear panel of your ADSL Router. DSL: RJ-11 connector LAN: Ethernet 10/100 Base-T auto-sensing Reset: Reset to factory settings Console: Console connector Power switch 12VDC: Power connector Note: The Router incorporates a four-port switch for connection to your local Ethernet network.

  • Page 11: Chapter 2: Installation

    Chapter 2: Installation Choosing a place for the ADSL Router Place the ADSL Router close to ADSL wall outlet and power outlet for the cable to reach it easily. Avoid placing the device in places where people may walk on the cables. Also keep it away from direct sunshine or heat sources.
  • Page 12 ADSL Router User Manual 10/100BaseT Ethernet Hub Connect the supplied power adapter to the PWR port of your ADSL Router, and plug the other end to a power outlet. Turn on the power switch. Note: For Full Rate (G.dmt) standard, a POTS Splitter is necessary on subscriber’s premise to keep the telephone and ADSL signals separated, giving them the capability to provide simultaneous Internet access and telephone service on the same line.

  • Page 13: Chapter 3: Connection Mode

    Chapter 3: Connection Mode Prior to configuring the ADSL Router, you must decide whether to configure the ADSL Router as a bridge or as a router. This chapter presents some deployment examples for your reference. Each mode includes its general configure procedures.

  • Page 14: Bridge Mode

    ADSL Router User Manual Bridge Mode Default Private IP PC(s) 192.168.100.100 Bridge Mode STM-1 Loop PPPoE Client S/W ADSL BRAS Router DSLAM Public IP assigned by BRAS RADIUS Server PPP over Ethernet BRAS Broadband Remote Access Server Description: In this example, the ADSL Router acts as a bridge which bridging PC IP address from LAN to WAN. PC IP address can be a static public address that is pre-assigned by ISP or a dynamic public address that is assigned by ISP DHCP server, or can be got from PPPoE software.

  • Page 15: Router Mode

    Chapter 3: Connection Mode Router Mode Default Private IP 192.168.100.100 for Management ADSL Router STM-1 Loop BRAS DSLAM Public IP(s) Pre-assigned PC(s) by ISP (+ NAT) RADIUS Server IP over ATM BRAS Broadband Remote Access Server Description: In this deployment environment, we make up a private IP network of 192.168.100.100. NAT function is enabled (on ADSL Router or use another NAT box connected to hub) to support multiple clients to access the Router and some public servers (WWW, FTP).
  • Page 16 ADSL Router User Manual Then you have set the web configuration successfully. And you can surf on the Internet. Note: If you have multiple PCs on the LAN, you may enable DHCP function on the private or public IP address. The ADSL Router implements a built-in DHCP server, which assigns IP addresses to the clients PCs on the LAN.

  • Page 17: Mer Mode

    Chapter 3: Connection Mode MER Mode Default Private IP PC(s) 192.168.100.100 Mode STM-1 Loop ADSL BRAS Router DSLAM Public IP assigned by BRAS RADIUS Server BRAS: Broadband Remote Access Server Description: In this deployment environment, we make up a private IP network of 192.168.100.100. NAT function is enabled to support multiple clients to access Internet.

  • Page 18: Pppoa + Nat Mode

    ADSL Router User Manual PPPoA + NAT Mode Default Private IP Dynamic Public IP 92.168.100.3 192.168.100.100 assigned by BRAS ADSL Router STM-1 Loop Ethernet PPP + NAT + BRAS DHCP on DSLAM Private LAN PC(s) 192.168.100.2 RADIUS Server PPP over ATM BRAS: Broadband Remote Access Server Description: In this deployment environment, the PPPoA session is between the ADSL WAN interface and BRAS.

  • Page 19: Pppoe + Nat Mode

    Chapter 3: Connection Mode PPPoE + NAT Mode Default Private IP 192.168.100.3 192.168.100.100 ADSL Router STM-1 Loop Ethernet PPPoE + NAT + BRAS DSLAM DHCP on Private LAN PC(s) 192.168.100.2 RADIUS Server PPP over Ethernet BRAS: Broadband Remote Access Server Description: In this deployment environment, the PPPoE session is between the ADSL WAN interface and BRAS.

  • Page 20: Pppoe Relay

    ADSL Router User Manual PPPoE Relay Default Private IP PC(s) 192.168.100.100 Bridge Mode STM-1 Loop PPPoE Client S/W ADSL BRAS Router DSLAM RADIUS Server PPP over Ethernet BRAS: Broadband Remote Access Server Description: In this example, the ADSL Router acts as a bridge which bridging PC IP address from LAN to WAN. Client PCs on the LAN should be equipped with PPPoE software to get public IP address from BRAS.

  • Page 21: Multiple Pvcs Mode

    Chapter 3: Connection Mode Multiple PVCs Mode 128.12.0.0 Service ADSL PVC2b Aggregator (PPPoE) Router PVC2 Loop STM-1 PVC1a PVC1 (IPoA) DSLAM 140.196.0.0 PC(s) Public IP(s) Pre-assigned by ISPs RADIUS Server Description: As this ADSL Router supports multiple PVCs in the ADSL loop, you are allowed to configure several logical channels in one physical loop.
  • Page 22 ADSL Router User Manual...

  • Page 23: Chapter 4: Configuration

    Chapter 4:Configuration In order to access the Internet through the router, each host on your network must install/setup TCP/IP. Please follow the steps below for select a network adapter. Setting TCP/IP on Client PC To access the ADSL Router via Ethernet, the host computer must meet the following requirements: With Ethernet network interface.
  • Page 24 ADSL Router User Manual The Network window appears. On the Configuration tab, check out the list of installed network components. Option 1: If you have no TCP/IP protocol, click Add. Option 2: If you have TCP/IP protocol, go to Step 6. Your network interface card.
  • Page 25 Chapter 4:Configuration On the left side of the windows, highlight Microsoft and then select TCP/IP on the right side. Then click OK. When returning to Network window, highlight TCP/IP protocol for your NIC and click Properties. On IP Address tab: Enable Specify an IP address option.

  • Page 26: For Windows Me

    ADSL Router User Manual Wait for Windows copying files. 10. When prompted with System Settings Change dialog box, click Yes to restart your computer. Click on the Start menu, point to Settings and click on Control Panel. Double-click the Network icon. The Network window appears.
  • Page 27 Chapter 4:Configuration On the IP Address tab, select Specify an IP address. Enter the IP address: 192.168.100.x (x is between 2 and 254), Subnet Mask: 255.255.255.0 and Default gateway: 192.168.100.100. Then click OK. While returning to the Network window, click OK. Wait for Windows copying files.

  • Page 28: For Windows Nt

    ADSL Router User Manual Click Start, point to Settings, and then click Control Panel. Double-click the Network icon. The Network window appears. On the Protocols tab, check out the list of installed network components. Option 1: If you have no TCP/IP Protocol, click Add. Option 2: If you have TCP/IP Protocol installed, go to Step 7.
  • Page 29 Chapter 4:Configuration Click Yes to use DHCP. Insert the Windows NT CD into your CD-ROM drive and type the location of the CD. Then click Continue. Returning to the Network window, you will find the TCP/IP Protocol among the list. Select TCP/IP Protocol and click Properties.
  • Page 30 ADSL Router User Manual Enable Specify an IP address option. Enter the IP Address: 192.168.100.x (x is between 2 and 254) and Subnet Mask: 255.255.255.0 and Default Gateway: 192.168.100.100 as in figure below. When returning to Network window, click Close. 10.

  • Page 31: For Windows 2000

    Chapter 4:Configuration From the Start menu, point to Settings and then click Network and Dial-up Connections. Right-click the Local Area Connection icon and then click Properties. On the General tab, check out the list of installed network components. Option 1: If you have no TCP/IP Protocol, click Install. Option 2: If you have TCP/IP Protocol, go to Step 6.
  • Page 32 ADSL Router User Manual Click Internet Protocol(TCP/IP) and then click OK. When returning to Local Area Connection Properties window, highlight Internet Protocol (TCP/IP) and then click Properties. Under the General tab, enable Use the following IP Address. Enter the IP address: 192.168.100.x (x is between 2 and 254), Subnet Mask: 255.255.255.0 and Default gateway: 192.168.100.100.

  • Page 33: For Windows Xp

    Chapter 4:Configuration From the Start menu, point to Control Panel and then click Network and Internet Connections. Click Network Connection and then click Properties. On the General tab, check out the list of installed network components. Option 1: If you have no TCP/IP Protocol, click Install. Option 2: If you have TCP/IP Protocol, go to Step 6.

  • Page 34: Configure Pc To Get Ip Address From Dhcp

    ADSL Router User Manual Configure PC to get IP address from DHCP If your ADSL Router operates as a DHCP server for the client PCs on the LAN, you should configure the client PCs to obtain a dynamic IP address. Please follow the previous section to install TCP/IP component. Only that you do not need to specify an IP address when configuring TCP/IP properties.

  • Page 35: For Windows Me

    Chapter 4:Configuration On the IP Address tab, select Obtain an IP address automatically. Then click OK. On the IP Address tab, click on the drop-down arrow of Adapter to select required adapter. Enable Obtain an IP address from a DHCP server and then click OK. When prompted with the message below, click Yes to continue.

  • Page 36: For Windows Xp

    ADSL Router User Manual On the IP Address tab, select Obtain an IP address automatically. Then click OK.

  • Page 37: Renew Ip Address On Client Pc

    Chapter 4:Configuration Renew IP Address on Client PC There is a chance that your PC does not renew its IP address after the ADSL Router is on line and the PC can not access the Internet. Please follow the procedures below to renew PC’s IP address. Select Run from the Start menu.

  • Page 38: For Windows Nt

    ADSL Router User Manual Select Run from the Start menu. Type cmd in the dialog box and the click OK. Type ipconfig at prompt. Then you will see the IP information from DHCP server. If you want to get a new IP address, type ipconfig /release to release the previous IP address and then type ipconfig /renew to get a new one.
  • Page 39 Chapter 4:Configuration...

  • Page 40: Chapter 5: Web Configuration

    Chapter 5: Web Configuration Using Web-Based Manager Once your host PC is properly configured, please proceed as follows: Start your web browser and type the private IP address of the ADSL Router in the URL field: 192.168.100.100. After connecting to the device, you will be prompted to enter username and password. By default, the username is admin and the password is admin.

  • Page 41: To Have The New Settings Take Effect

    Chapter 5: Web Configuration Status: Displays the current status of the ADSL Router, including DSL Connection, WAN Connection, Traffic Counter, Routing Table, DHCP Table and Wireless Clent. Configuration: It displays the configuration categories of the ADSL Router, including DSL, LAN, WLAN, WAN, IP Route, DNS, Security, Virtual Server, IGMP Proxy and UPnP settings.

  • Page 42: System

    ADSL Router User Manual User Name: The name put here is the one that you set on the WAN Configuration web page. Password: The password put here is the one that you set on the WAN Configuration web page. Connect and Save: Please click this button to make the PPP connection enabled.
  • Page 43 Chapter 5: Web Configuration To save the new settings to flash memory and take effect next time your reboot the ADSL Router, after clicking Apply, you should perform the task of Save Configuration. Remote Management This function allows remote client to access this router from WAN side. You can set the lease time and click Enable to enable this setting.

  • Page 44: Backup Configuration

    ADSL Router User Manual This web page allows you to backup the configuration settings to your computer for retrieving next time. Click on Backup button to backup your configuration to your hard disk. In addition, to retrieve the saved configuration and use again, use Browse to locate the backup configuration file. After selecting the desired file, please click Restore to use it for current web page.

  • Page 45: Reset Router

    Chapter 5: Web Configuration After upgrading, the original configuration will still exist and not reset to the factory defaults. This page allows you to restart your router for invoking new configuration. After restarting, you should wait for several seconds to let the system come up. When restarting the system, your brower session will be disconnected. Please wait until the device finish restarting.

  • Page 46: Status

    ADSL Router User Manual Status This page shows the DSL line connection status as below: Line Mode: The ADSL Router supports multi-mode standard. DS (Downstream)/US (Upstream) Speed: The downstream/upstream speed of the DSL line. DS/US Latency: Displays whether a fast or interleaved latency path is specified. Trellis coding: Indicates trellis coding is enabled or disabled.

  • Page 47: Traffic Counter

    Chapter 5: Web Configuration This page shows the records of data going through the LAN and WAN interface. For each interface, cumulative totals are displayed for Sent/Received Packets and Sent/Received Bytes. By clicking Refresh, all the records will be reset. This page shows all the routing rules of data packets going through your ADSL Router if it runs in routing mode.

  • Page 48: Configuration

    ADSL Router User Manual Configuration DSL Line Mode: The ADSL Router supports multi-mode standard: Auto, G.lite, G.dmt and ANSI T1.413. Choose an appropriate line mode according to the setting of DSLAM in central office and then click Apply. The DSL line mode you specify will be applied to the entire ADSL Router unit. All ATM PVC profiles created will use the same line mode.

  • Page 49: Dhcp Server

    Chapter 5: Web Configuration Primary IP Address: Private IP address is used for the purpose of system management. When it is assigned, PC on the LAN is able to use the specified address to access this ADSL Router through Ethernet. By default, the IP address and subnet mask is 192.168.100.100 and 255.255.255.0 respectively.
  • Page 50 ADSL Router User Manual Interface: Select the interface for the connection of DHCP server. The default one is Primary LAN. Start IP Address: Decides the start point of the IP range for this connection. End IP Address: Decides the end point of the IP range for this connection. DHCP lease time: Type in the time that a network device can lease a private IP address before the ADSL Router reassigning the IP address.
  • Page 51 Chapter 5: Web Configuration...

  • Page 52: Wlan Configuration

    ADSL Router User Manual This setting is available for wireless router only. This section shows you how to configure the wireless LAN setting. To types are provided here, Basic Setup and Association Control. Basic Setup Wireless SSID (Service Set Identity): A name that uniquely identifies a wireless domain. All wireless clients that want to communicate with the ADSL Router must have the same SSID as it.

  • Page 53: Association Control

    Chapter 5: Web Configuration Wired Equivalent Privacy Mechanism The privacy security function can enhance wireless media security by encryption technology. All wireless clients must set the same encryption key to maintain the tightened communication with the ADSL Router properly. The Authenticate Algorithm options are: When the wired Equivalent Privacy Mechanism is Turns off.

  • Page 54: Wan Configuration

    ADSL Router User Manual The ADSL Router supports for Asynchronous Transfer Mode (ATM) over ADSL. To set up connections over the WAN, you have to define ATM PVC interface for each remote connection. On this page, you can create, modify and delete PVC interface.
  • Page 55 Chapter 5: Web Configuration Unless your ATM PVC is set on RFC1483 Bridged mode, you can check NAT box to enable NAT function. If you are using PPP configuration mode, you need to fill in the user name and password and you can set the PPP session to Dial on demand or Always on mode.

  • Page 56: Ip Route

    ADSL Router User Manual Dial On Demand: If checked, under disconnected status, if any client PC sends out request for connection, the ADSL Router will dial the ISP automatically. In this case, if the system administrator wants to disconnect the PPP session, just click the Disconnect button at Quick Start page. Always On: Enabling this feature will send echo request to ISP.

  • Page 57: Dns

    Chapter 5: Web Configuration Dynamic Routing Routing Information Protocol (RIP) is utilized as a means of exchanging routing information between routers. It helps the routers to determine optimal routes. This page allows you to enable/disable this function. By default, RIP is disabled with Disabled selected. You are allowed to enable RIP over the primary LAN interface. Upon each interface, you can customize the RIP on Receive Mode and Transmit Mode respectively.

  • Page 58: Dns Server

    ADSL Router User Manual does not need to type in the DNS server address. Simply click Enabled item on DNS Relay settings and leave the address entry lines blank. Finally, click Apply. DNS Relay will be invoked. If you have been setting before, the page will show all the DNS Relay status. To disable DNS relay, just select the Disabled option then click Configure.

  • Page 59: Security

    Chapter 5: Web Configuration DNS Server: Select Enabled or Disabled to enable/disable the DNS server and then click Apply. The DNS hostname table shows all the current DNS clients, whether created by DHCP client or manually created. If it created by manual client, you can delete the hostname entry on the table.
  • Page 60 ADSL Router User Manual Click on The table of default policies for various security levels to see the traffic blocked status for each setting. The higher the security level is, the more traffic blocked for the service is. When the firewall is disabled, it will be OK for accessing in/out Internet, and the router will support PPTP packet and IP Sec Packet for passing through.
  • Page 61 Chapter 5: Web Configuration To have a user define firewall setting, please select Advanced (User Define) firewall and click Apply. There are two selections for packet filtering rules appeared to ask you choosing one. Please choose the one you want and click Configure.

  • Page 62: Intrusion Detection

    ADSL Router User Manual Protocol Type: Select the type that you want for the filtering rule. Local Side: Type in the source IP address and subnet mask. Remote Side: Type in the destination IP address and subnet mask. Port Range: Enter the start and end point number.
  • Page 63 Chapter 5: Web Configuration DOS Attack Block Duration: It defines the duration that the suspicious host will be blocked once DOS activity is detected. The unit is defined in second. Scan Attack Block Duration: It defines the duration that the suspicious host will be blocked once Scan activity is detected.

  • Page 64: Virtual Server

    ADSL Router User Manual The Router implements NAT to let your entire local network appear as a single machine to the Internet. The typical situation is that you have local servers for different services and you want to make them publicly accessible. With NAT applied, it will translate the internal IP addresses of these servers to a single IP address that is unique on the Internet.

  • Page 65: Setting Up Dmz Host

    Chapter 5: Web Configuration ATM PVC Name: Select the ATM PVC name from the drop down list. Currently only ppp-0 interface is provided. Protocol: Select a protocol type used by the service that will be forwarded. TCP/IP Port: The Router supports port mapping function that translates a standard port number to a non-standard number.

  • Page 66: Igmp Proxy

    ADSL Router User Manual Select the ATM PVC interface. Enter the IP address of the internal server in the IP Address filed. Click Apply to commit the setting. The Internet Group Management Protocol (IGMP) is an Internet protocol that provides a way for an Internet computer to report its multicast group membership to adjacent routers.

  • Page 67: Upnp (Optional)

    Chapter 5: Web Configuration Universal plug and play (UPnP) is an architecture for pervasive peer to peer network connectivity of intelligent appliances and PCs of all form factors. It is designed to bring easy-to-use, flexible, standards-based connectivity to ad-hoc or unmanaged networks whether in the home, in a small business, public spaces, or attached to the Internet. To enable UPnP function, just check the Enable UPnP Function box and then click Apply to activate the function.
  • Page 68 ADSL Router User Manual 3. Select Network Services and click Details. Click the Universal Plug and Play check box. Click Ok. The system will install UPnP components automatically. After finishing the installation, go to My Network Places. You will find an icon (ex: ZXDSL 531B) for UPnP function.
  • Page 69 Chapter 5: Web Configuration 192.168.100.2 192.168.100.2...

  • Page 70: Chapter 6: Troubleshooting

    Chapter 6:Troubleshooting If the suggested solutions in this section do not resolve your issue, contact your system administrator or Internet service provider. Problems with LAN PCs on the LAN can not get IP addresses from the ADSL Router. The chances are that the interface used as DHCP server is modified and the client PCs do not renew IP addresses. If your DHCP server is enabled on Private IP Address previously and you modify the interface to Public IP Address, the client PCs should renew IP addresses.

  • Page 71: Problems With Upgrading

    Chapter 6:Troubleshooting If you get a failed ping with the response of: Request time out Then the DNS is not reachable. Check your DNS setting on the ADSL Router. Problems with Upgrading The following lists the error messages that you may see during upgrading and the action to take. Error: All the ADSL LEDs light up and cannot light off as usual.
  • Page 72 ADSL Router User Manual Error Message: transfer time out Possible cause: The transfer session is interrupted. Action: a. Make sure the TFTP server is on the same subnet with the ADSL Router. b. Make sure you the IP address of the TFTP server you specify is correct and that your TFTP server is started. c.
  • Page 73 Chapter 6:Troubleshooting...

  • Page 74: Chapter 7: Glossary

    Chapter 7: Glossary ARP (Address Resolution Protocol ) ARP is a TCP/IP protocol for mapping an IP address to a physical machine address that is recognized in the local network, such as an Ethernet address. A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network.

  • Page 75: Private Ip Address

    Glossary Private IP Address Private IP addresses are also LAN IP addresses, but are considered “illegal” IP addresses to the Internet. They are private to an enterprise while still permitting full network layer connectivity between all hosts inside an enterprise as well as all public hosts of different enterprises.

  • Page 76: Appendix: Specifications

    Appendix: Specifications ADSL Compliance For Annex A ADSL Router ANSI T1.413 Issue 2 ITU G.992.1 Annex A (G.dmt) ITU G.992.2 Annex A (G.lite) ITU G.994.1 (G.hs) For Annex B ADSL Router ITU G.992.1 Annex B (G.dmt) ITU G.994.1 (G.hs)) ATM Features Compliant to ATM Forum UNI 3.1 / 4.0 Permanent Virtual Circuits (PVCs) Support up to 8 AAL5 Virtual Circuit Channels (VCCs) for UBR, CBR, VBR-rt, and VBR-nrt with traffic shaping...

  • Page 77: Hardware

    Appendix: Specification Intrusion Detection provides protection from a number of attacks (such as SYN/FIN/RST Flood, Smurf, WinNuke, Echo Scan, Xmas Tree Scan, etc) WEP (Wired Equivalent Privacy) encryption uses RC4 with 64/128 bit key length (for wireless ADSL router only) Wireless LAN Features Fully compatible to IEEE 802.11b standard and allow operating range up to 300 meters (open space) and 100 meters (indoor).

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