EnGenius ESR1221N2 Bedienungsanleitung

300N Wireless Router ESR1221 N2 300N Wireless R outer V1.0[...]

1 1. Introduction .......... ........... ................ ............ ............ ............ ............ ............... ............ ............ ............ ................ ........ 7 1.1. Package Contents .......... ............ ................ ............ ............ ............ ........... ................ ............ ............ [...]

2 5.6. Monitor ...... ........... ............ ............ ................ ............ ............ ............ ........... ................ ............ ............ .......... 46 5.7. Language ... ............... ............ ............ ............ ............ ............... ............ ............ ............ ............ ...........[...]

3 8.4. Denial of Service (DoS) .......... ............ ............ ................ ........... ............ ............ ............ ................ ............ ...... 78 8.5. MAC Filter ............. ............ ............ ................ ............ ........... ............ ............ ................ ............ ............ .......[...]

4 10.7. Firmware ................ ............ ................ ............ ............ ........... ................ ............ ............ ............ ............ ...... 98 10.8. Back-up ................. ............ ............ ................ ............ ........... ............ ............ ................ ............ ............ [...]

5 Revision Histor y Version Date Notes 1.0 2010/12/09 First Release[...]

6[...]

7 1. Intr oduction 1.1. Package Conten ts • EnGenius 11N WIRELESS ROUTER • AC Adapter • RJ-45 Ethernet LAN Cable • CD-ROM with User Manual and Setup Utility • Quick Guide 1.2. System Require ments • RJ-45 Ethernet Based Internet (ADSL or Cable Modem) • Computer with Wireless Network function • Windows, Mac OS or Linux based operatin[...]

8 1.3. Introduction ESR1221N2 is a palm size 11N WIRELESS ROUTER. It allows users to create a wireless network and share the Internet among multiple users. The ESR1221N2 can be connected to the Internet through a DSL/Cable modem at any available location. It can even share the connection in your hotel’s room if a RJ-45 network cab le is used. ESR[...]

9 1.4. LED Overview LED Lights Icon Description Wireless LAN Color – Blue Lights when Wireless s ignal is activated . Blinks when Wireless dat a transfer. Internet Color – Blue Blinks when WPS handsh ake is initial ized. LAN Color – Blue Lights when wired network de vice is connec ted to RJ-4 5 port. Blinks when data transfer o ccurs on RJ-4 [...]

10 1.5. Before you Begin This section will guide you through the installatio n process. Placement of the ESR1221N2 is very important to avoid poor signal reception and performance . Avoid placing th e device in enclosed spaces such as a closet, cabinet or wardrobe. 1.6. Considerations f or Wireless Installati on The operating distance of all wirele[...]

11 2. Configure PC/La ptop Network I nterface 2.1. Windows XP/Vista     Click Start button and open Control Pane l. Windows XP Windows Vista[...]

12     Windows XP, click [Network Connection]     Right click on [Local Area Connection] and select [Properties].     Wi ndo ws Vista, click [View Network Status and Ta sks] then [Manage Network Connections][...]

13     Check “ Client for Microsoft Networks ”, “ File and Printer Sharing ”, and Internet Protocol (TCP/IP) is ticked. If not, please install them.     Select Obtain an IP Address automa tically and Obtain DNS server address automatica lly     Click OK when done     Select “ Internet Protoc[...]

14 2.2. Windows 7     In the Start menu search box, type: ncpa.cpl     The Network Connections List appears.     Right-click the Local Area Connection icon and click Properties .[...]

15     In the Networking tab of the Local Area Conne ction Properties dialog box, click either Inte rnet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 ( TCP/IPv6) , and then click Properties .     Select Obtain an IP Addre ss automatically and Obtain DNS server address a utomatically     Click OK w[...]

16 2.3. Apple MacOS     Go to Sys tem Preferences > Network     Under Network setting, select Using DHCP .     Click Apply when done.[...]

17 3. Set up your Router[...]

18[...]

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20 4. M anually enter Setup Wi zard 1. Open a web browser (Internet Explorer/Firefox/Safari) and ent er the IP Address http://19 2.168.0.1 Note: If you have changed the default LAN IP Address of the WIRELESS ROU TER, ensure you ent er the correct I P Address . 2. The default username and password are admin . Once you have entered the correct userna[...]

21 3. You will see the following webpage if login success ful.[...]

22 4. Click Wizard to enter the Setup Wizard. Then click Next to begin the wizard.[...]

23 5. Select the Operation Mode. Please ensure you have the proper cables connected as described in the Hardware Installation section.[...]

24 AP Router M ode a) The device will now automatically search for the correct Internet settings. b) The most appropriate WAN type will be determined and selected automatically. If it is incorrect, please select Others to set up the WAN settings manuall y.[...]

25 c) There are many WAN serv ice types available. Please obtain the correct settings from your Internet Service Provider (ISP). Static IP Address If your ISP Pr ovider has assigned you a fixed IP address, enter the ass igned IP address, Subn et mask, Default Gateway IP address , and Primar y DNS and Secondary DNS (if available) of your ISP provide[...]

26 Dynamic IP Address The IP Address is allocated aut omatically. Ho wever some ISP’s will also re cognize the M AC address a nd will reject connections if the MAC address does not match. If your ISP has recorded the MAC addres s of your computer ’s Ethernet LAN card, please connect o nly the computer with the authorized MA C address, and click[...]

27 PPP over Ethernet ISP requires an account use rname and pass word. PPP over Etherne t Username: Username assign ed to you by the ISP Password: Password for this username . Service: You can ass ign a name fo r this service. (Optional) MTU: The maximum size of pa ckets. Do not change u nless mentioned by the ISP.[...]

28 Point-to-Point Tunneling Protocol (PPTP) PPTP is used by some ISPs.[...]

29 PPTP WAN Interface Sett ings WAN Interface Type: Select whether the ISP is set to Static IP or Dynamic IP addresses. Hostname: This is option al. Only req uired if specified by ISP MAC: The MA C Address that is used to conne ct to the ISP . PPTP Settings Login: Username assign ed to you by the ISP Password: Password for this username . Service I[...]

30 d) Setup the level of wireless security to be used. EnGenius recommends the Highest level of security to be used. Note: 802.11n wireless speeds may n ot be achievabl e if the security i s setup to Lowest and Low l evel. SSID: Enter the name of your wireless networ k. Key: Enter the se curity key for your wireless network.[...]

31 e) Check the settings are correct, and then click Re boot to apply the settings.[...]

32 5. Sy stem 5.1. Status This page allows you to monitor the status of the device . Status Model: Description of this dev ice. Mode: The devi ce is currently in which mode . Uptime: The duration about the d evice has been op erating without power ing down or reb oot. Current Date /Time: The devi ce’s system time. If this is incor rect, please se[...]

33 WAN Settin gs Attain IP Pr otocol: Method used to connect to the Internet IP address: The WAN IP Address of th e device. Subnet Mask The WAN Subnet Mask o f the devi ce. MAC address The MA C address of the device’s WAN Interface. Primary and Sec ondary DNS: Primary and Secondary D NS servers ass igned to th e WAN connection.[...]

34 LAN Settings IP address: The LAN IP Address of the device. Subnet Mask The LAN Subn et Mask of the device . DHCP Server Whether the DHCP serv er is En abled or Disabled .[...]

35 WLAN Settin gs Channel: The wire less channel in use. ESSID: The SSID (Network Nam e) of the wireless networ k. (up to 4 SSI D’s are suppo rted) Security: Wireless encr yption is enabled for this SS ID. BSSID: The MA C address of this SSID. Associated C lients: The numbe r of wire less clients connecte d to this SSID.[...]

36 5.2. LAN This page allows you to modify the device’s LAN settings.[...]

37 LAN IP IP address: The LAN IP Address of this device. IP Subnet Mask: The LAN Subn et Mask of this device. 802.1d Spann ing Tree: When Enab led, the Span ning Tree pr otocol wi ll prevent net work loops in your LAN netw ork.[...]

38 DHCP Server DHCP Server: The DH CP Server automa tically allocates IP addres ses to your LAN devices. Lease Time: The duration of the D HCP server allocates each IP address to a LAN device. Start / End I P: The range of IP addresse s of the DHCP server will allocate to LAN devices. Domain name: The domain name for this LAN network .[...]

39 Two DNS servers can be assigned for use by your LAN device s. There are four modes available. DNS Servers From ISP: The DNS server IP addres s is assigned from your ISP. User-Define d: The DNS server IP addre ss is assigned manual ly. DNS Relay: LAN clients are assigned the device’s IP address as the DNS server. DNS requests are relayed to the[...]

40 5.3. DHCP This page shows the status of the DHCP server and also allows you to control how the IP address es are allocated.[...]

41 The DHCP Client Table shows the LAN clients that have been allocated an IP address from the DHCP Server . DHCP Client Ta ble IP address: The LAN IP address of the client. MAC address: The M AC address of the client’s LA N interface . Expiration T ime: The time that the allocat ed IP address will expire . Refresh: Click this button to upda te t[...]

42 You can also manually specify the IP address that will be al located to a LA N client by associati ng the IP address with its MAC address. Type the IP address you would like to manually ass ign to a specific MAC address and click Add to add the condition to the Static DHCP Table.[...]

43 5.4. Schedule This page allows you to schedule times that the Firewal l and Power Saving features will be activated / deactivated. Click Add to create a Schedule entry.[...]

44 Schedule Schedule Descr iption: Assign a n ame to the sch edule. Service: The service p rovides for the schedu le. Days: Define the Days to activat e or deactivate the schedu le. Time of day: Define the Time of day to activate or deactivated the schedule . Please use 24-hour c lock format.[...]

45 5.5. Log This page displays the system log of the device. When powered down or rebooted, the log will be cleared. Log Save: Save the log to a file. Clear: Clears the log. Refresh: Updates the log.[...]

46 5.6. Monitor This page shows a histogram of the WAN and Wireles s LAN traffic. The information is automatical ly up dated every five sec onds.[...]

47 5.7. Language This page allows you to change the Language of the User Interfa ce.[...]

48 6. Internet The Internet section allows you to manually set the WAN type connec tion and its related settings. 6.1. Status This page shows the current status of the dev ice’s WAN connection.[...]

49 6.2. Dynamic IP Address The IP Address is allocate d automatically. However some ISP’s will also recognize the MAC address and will rejec t connections if the MAC address does not match. If your ISP has recorded the MAC address of y our co m puter’s Ethernet LAN card, please connect only the compu ter with the authorized MAC address, and cli[...]

50 Dynamic IP Ad dress Hostname: This is option al. Only req uired if specified by ISP MAC address: The MA C Address that is used to conne ct to the ISP . DNS Servers Two DNS servers can be assigned for use b y your LAN devices . There are two modes avai lable. From ISP: LAN devices are assigne d the DNS se rver IP addr ess of your I SP. User-Defin[...]

51 6.3. Static IP Address If y our ISP Provi der has assigned you a fixed IP address , enter the assigned IP address , Subnet mask, Default Gateway I P address, a nd Primary DNS and Secondary DNS (if available) of yo ur ISP provider. Static IP Addre ss IP address: Assign an IP address Manuall y. IP Subnet Mask: Specify an IP address’s su bnet mas[...]

52 6.4. PPP over Ethernet ISP requires an account use rname and pass word.[...]

53 PPP over Ether net (PPPoE) Username: Username assigned to y ou by the ISP Passw ord: Password for this usern ame. Service: You can assign a nam e for this servi ce. (Optional) MTU: The ma ximum si ze of packets. Do not change unl ess mentioned by th e ISP. Authentic ation type Select whether the ISP us es PAP or CHA P methods for auth entication[...]

54 6.5. Point-to-Point Tunneling Protocol (PPT P) PPTP is used by some ISPs.[...]

55 Point-to-Po int Tunneling Protocol (PPTP) WAN Interface Type: Select whether the ISP is set to Static IP or will a llocate Dyna mic IP addresses. Hostname: This is option al. Only req uired if specified by ISP MAC address: The MA C Address that is used to conne ct to the ISP . Login: Username assign ed to you by the ISP Password: Password for th[...]

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57 7. Wir eless The Wireless section allows you to configure the Wirele ss settings. 7.1. Status This page shows the current status of the dev ice’s Wireless settings.[...]

58 Basic Radio: Enable or D isable the dev ice’s wireless signa l. Mode: S elect between Access Po int or Wireless Distribution System (WDS) modes. Band: Select the types of wireless c lients that the device will a ccept. eg: 2.4 GHz (B+G +N) Only 802.11b an d 11g clien ts will be al lowed. Enable SSID#: Select the number of SSID’s (Wireless Ne[...]

59 Wireless Distribution System (WDS ) Using WDS to connect Access Point wireless ly, and in doin g so extend a wired infrastructure to locations where cablin g is not possible or inefficient to implement. Note that compatibility between different brands and models is not guaranteed. It is recommended that the WDS network be created using the same [...]

60 7.2. Advanced This page allows you to configure wireless adva nce settings. It is recommended the default settings are used unless the user has experience with these functions.[...]

61 Advanced Fragment Threshold: Specifies the size of the p acket per fragment. This funct ion can reduce the chance of packet co llision. However when this value is set too low, there will be in creased overheads resu lting in po or performan ce. RTS Threshold : When the packet size is sma ller than the R TS Threshold , then the pa cket will be se[...]

62 7.3. Security This page allows you to set the wireless sec urity settings. Security SSID Select ion: Select the SSID that the secur ity settings wi ll apply to. Broadcast SS ID: If Disabled, then the device wil l not be broadc astin g the SSID. There fore it w ill be invisib le to wireless clients. WMM: Wi-Fi Multi-Me dia is a Q uality of Servic[...]

63 Note that in certain situa tions, WMM needs to be en abled to achieve 11n t ransfer speeds . Encryption: The encrypti on method to be applied. You can choose from WE P, WPA pre-sh ared key or WPA RADI US. • Disabled - no data encryp tion is used. • WEP - data is encrypted using the WEP standard . • WPA-PSK - dat a is encryp ted using the W[...]

64 802.1x Authen tication RADIUS Se rver IP Address: The IP Address of the RA DIUS Server RADIUS Se rver port: The port nu mber of the RADI US Server. RADIUS Se rver passwor d: The RADIUS Server’s pas sword.[...]

65 WEP Encryption: WEP Encry ption Authentication Type: Please ensur e that your wireless clients use the same authenticat ion type. Key type ASCII: regular text (recom mended) HEX: for advan ced users Key Length: Select the desired option, and en sure the wireless clients use the same sett ing. • 64 Bit - dat a is encrypted , using the defau lt [...]

66 Encryption Key #: Enter the key value or va lues you wish to use. Only the Key sele cted as Defau lt is required. The o thers are op tional. WPA Pre-Shared Key Encryption: WPA Pre-Share d Key En cryption Authentication Type: Please ensure tha t your wireless clients use the same aut hentication type. WPA type: Select the WP A encryption you woul[...]

67 WPA RADIUS Encryption: WPA RAD IUS Encryption WPA type: Select the WP A encryption you would like . Please ensure tha t your wireless clients use the same se ttings. RADIUS Se rver IP address: Enter the IP address of the RA DIUS Server RADIUS Se rver Port: Enter the port numb er used for connectio ns to the R ADIUS server . RADIUS Se rver passwo[...]

68 7.4. Filter This page allows you to create filters to control which wireless clients can connect to this dev ice by on ly allowing the MAC addresses entered into the Filtering Table .[...]

69 Wireless Filter Enable Wirel ess Access Contr ol: Tick the box to Enable Wireless Access Control . When Enabled , only wireless clients on the Filterin g Table will be allowed. Description: Enter a name or description for th is entry . MAC address: Enter the MAC addre ss of the wire less client that you wish to allow connection. Add: Click th is[...]

70 7.5. Wi-Fi Protected Setup (WPS) WPS feature is following the Wi-Fi Alliance WPS standard and it eases the set up of security-enable d Wi-Fi networks in the home and small office environment. It reduces the user steps required to configure a network and suppo rts two methods that are fami liar to most c onsume rs to configure a network and enabl[...]

71 Wi-Fi Protecte d Setup (WPS) WPS: Tick to Enable the WPS feature . WPS Button: Tick to Enable the WPS push button. Wi-Fi Protecte d Setup I nformation WPS Curren t Status: Shows whether the WPS function is Configured o r Un-configured . Configured means that W PS has been used to au thorize connect ion between the dev ice and w ireless clients. [...]

72 1. Pin Code Method Note the Pin code of your WIRELESS ROUTER d evi ce. Please use this Pin code to initialize the WPS process from the wireless client configuration u tility. This process will be different for each brand or model. Please consult the user manual of the wirele ss client for more information.[...]

73 7.6. Client List This page shows the wireless clients that are connected to the WIREL ESS ROUTER device.[...]

74 7.7. Policy This page allows you to configure the access policies for each SSID (wireless network). Policy WAN Connecti on: Allow wireless clients on this SSID to acce ss the WAN p ort which typ ically is an Intern et connection. Communicat ion between Wireless clients: Whether ea ch wireless cl ient can commun icate w ith each other in this SSI[...]

75 8. Fir ewall The Internet section allows you to set the access control and Firewa ll settings. 8.1. Enable This page allows you to Enable / Disa ble the Firewall features. When Enabled, Denial of Service (DoS) and SPI (Stateful Packet Inspection) features are also be enabled.[...]

76 8.2. Advanced You can choose whether to allow VPN (Virtual Private Network) packe ts to pass through the Firewall.[...]

77 8.3. DMZ If enabled this feature, all ows the DMZ computer on your LAN to be exposed to all users on the Internet. • This allows almost any application to be used on the server. • The “DMZ PC” will receive all Unknown connections and data . • If the DMZ feature is enabled, please enter the IP address of the PC to be used as the “DMZ [...]

78 8.4. Denial of Service (DoS) Denial of Service (Denial of Service) is a type of Internet attac k that sends a high amount of data to you with the intent to overload your Internet connection. Enable the DoS firewall feature to automatically detect and block these DoS attacks .[...]

79 8.5. MAC Filter You can choose whether to Deny or only Allow those computers listed in the MAC Filtering table to access the Internet. MAC Filter Enable MAC f iltering: Tick this box to Enable the MAC filtering featu re. Deny all clien ts with M AC addresse s listed bel ow to access t he network: When selected , the comput ers listed in the MAC [...]

80 8.6. IP Filter You can choose whether to Deny or only Allow, computer with those IP Addresses from acce ssing certain Ports. This can be used to control which Internet applicati ons the computers can access. You may need to have certain knowled ge of what In ternet ports the a pplications use. IP Filter Enable IP fi ltering: Tick this box to Ena[...]

81 8.7. URL Filter You can deny access to certain websites by blocking keywords in the URL web address. For example, “abc123” has been added to the URL Blocking Table . Any web address that includes “abc123” will be blocked.[...]

82 9. A dvanced The Internet section allows you to configure the Advance d settings of th e router. 9.1. Network Address Translation (NAT) This page allows you to Enable / Disa ble the Network Addr ess Trans lation (NAT) feature. The NAT is required to share one Internet account with multiple LAN users. It also is required for certain Firewall feat[...]

83 9.2. Port Mapping Port Mapping all ows you to redirect a particula r range of ports to a computer on your LAN network. This helps you host servers behind the NAT and Firewall. In the example below, there is a Ma il Server th at requires ports 22 to 23. When there is a connection from the Internet on those ports, it will be redirected to the Mail[...]

84 9.3. Port Forwarding Port Forwarding allows you to redirect a particula r public port to a computer on your LAN network. This helps you host servers behind the NAT and Firewall. In the example below, there is a FTP Server running on port 21 on the LAN. For security reasons, the Administrator would like to provide this server to Internet connecti[...]

85 9.4. Port Trigger If you use Internet applications which use non-sta ndard connections or port numbers, you may find that they do not function correctly because they are blocked by the Wireles s Router's firewall. Port Trigger will be required for these applications to work. Port Trigger Enable Port Forwardin g Tick this box to Enable the P[...]

86 9.5. Application Layer G ateway (ALG) Certain applications may require the use of ALG feature to function correctly. If you use any of the a pplications listed, please tick and select it to enable this feature.[...]

87 9.6. Universal Plug and Play (UPnP) The UPnP function allows automatic discove ry and con figuration of UPnP enabled devices on your network. It a lso provides automatic port forwarding for supported applica tions to seamlessly bypass the Firewall. Universal Plu g and Play (UPnP) Enable the UPnP Feature: Tick this box to Enable the UPnP feature [...]

88 9.7. Quality of Service (Qo S) QoS allows you to control the priority that the data is transmitted over the Internet, or to reserve a specific amount of Internet bandwidth. This is to ensure that applications get enough Internet bandwidth for a pleasant user experience. If not, then the performance and user experience of time sensitive transmiss[...]

89 Priority Queue Method Bandwidth priority is set to either High or Low. The transmissions in the High queue will be process ed first. Unlimited Priority Que ue Local IP Addre ss: The computer with this IP Add ress will not be bound by the QoS rules. High / Lo w Priority Queu e Protocol: The type of network protocol. High / Lo w Priority Sets the [...]

90 Bandwidth Allocation Method You can set the maximum am ount of bandwidth a certain protocol will use at one time. Or you can set a minimum amount of bandwidth that will be guaranteed to a certain protocol. Bandwi dth Allocation Type: Set whether the QoS rule s apply to tran smission th at are Downlo ad, Uploa d or Both dire ctions. Local IP ran [...]

91 9.8. Routing If your WIRELESS ROUTER device is connected a network with different subnets, then this feature will allow the different subnets to communicate with each other. Note: NAT func tion needs to be disabled f or the Routi ng feature to be enabled. Static Rout ing Enable Stat ic Routing: Tick this box to Enable the Static Route r feature.[...]

92 Destinatio n S ubnet Mask Ga teway Hop I nterface 192.168.1.0 255.255.255.0 19 2.168.123.216 1 LAN 192.168.0.0 255.255.255.0 19 2.168.123.103 1 LAN So if, for example, Client3 wants to send an IP da ta packet to 192.168.0.2 (Client 2), it would use the above tabl e to determine that it had to go via 192.168.123.103 (Router 2) And if it sends Pac[...]

93 10. Tools This section allows you to configure some device sys tem settings. 10.1. Admin This page allows you to change the system password and to configure remote management. Change Passw ord Old Passw ord: Enter the current password. New Passwor d: Enter your ne w password. Repeat New Password: Ent er your ne w password again for verificat ion[...]

94 10.2. Time This page allows you to set the system time. Time Time Setup: Select the method you w ant to set the t ime. Time Zone: Select the tim e zone for your current locat ion. NTP Time Serv er: Enter the addres s of the Network Time P rotocol (NTP ) Server to automatically s ynchronize with a server on the Internet. Daylight Sav ings: Check [...]

95 10.3. Dynamic DN S (DDNS) This free service is very useful when combined with the Virtual Server feature. It allows Intern et users to connect to your Virtual Servers using a URL, rather than an IP Address. This also solves the problem of having a dynam ic IP address. With a dynamic IP address , your I P addres s may change whenever you connect,[...]

96 10.5. Power This page allows you to Enable or Disable the wireless LAN power saving features.[...]

97 10.6. Diagnosis This page allows you determine if the WIRELESS ROUTER device has an active Internet connection. Diagnosis Address to P ing: E nter the IP address you like to see if a successful connection can be made. Ping Result: The results of the Ping test.[...]

98 10.7. Firmwa re The firmware (softwa re) in the WIRELESS ROUTER devi ce can be upgraded using your Web Browser. To perform the Firmware U pgrade: 1. Click the B rowse button and nav igate to the loca tion of the upgrade file. 2. S elect the upgrade file. Its name will app ear in th e Upgrad e File field. 3. Click the Apply b utton to commence th[...]

99 10.8. Back-up Back-up Restore to fact ory default: Restores the dev ice to factor y default sett ings. Backup Sett ings: Save the current co nfiguration settings to a f ile. Restore Sett ings: Restores a previo usly sav ed configurati on file. Click Browse to se lect th e file. Then U pload to load the settings.[...]

100 10.9. Reset In some circumstances it may be required to force the device to reboot.[...]

101 Appendix A – FCC Interfere nce State ment Federal Communication Commission Interference S tateme nt This equipment has been t ested and found to comply with the l imits f or a Class B digital device, pursuant t o Part 15 of the FCC Rules. T hese limits are designed to provide reasonable protection against harmful interference in a residential[...]

102 FCC Caution: A ny changes or m odifications not ex pressly approved by the party responsible for compliance could void the user's authority t o operate this equipment. IMPORTANT NOTE: FCC Radiati on Exposure Sta tement: This equipment complies with FCC radiation ex posure limits set f orth for an uncontrolled environment. This equipment sh[...]

103 Appendix B – IC Inte rference Stateme nt Industry Canada statement: This device complies with RSS-210 of the Industry Canada Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference r eceived, including interference that may cause undesire[...]