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Sagittar SGT-LD-5-23 User Manual

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  • Page 1 SGT-LD-5-23 LD IP Radio Link User Manual...

  • Page 2: About This Manual

    About This Manual This user manual is intended to guide a professional installer to install the SGT-LD-5-23 and how to build the infrastructure around it. It includes procedures to assist you to avoid unforeseen problems.

  • Page 3: Federal Communication Commission Interference Statement

    Federal Communication Commission Interference Statement This equipment has been tested and found to comply 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.
  • Page 4 FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. To avoid the possibility of exceeding radio frequency exposure limits, you shall keep a distance of at least 100cm between you and the antenna of the installed equipment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

  • Page 5: Table Of Contents

    Content Chapter 1 Introduction ........................11 Introduction ............................11 Appearance ............................11 Key Features ............................ 12 Typical Applications .......................... 13 Telemedicine Wireless Broadband Application ................13 Education Wireless Broadband Application .................. 14 Chapter 2 Hardware Installation ....................... 15 Preparation before Installation ......................15 Professional Installation Required ....................
  • Page 6 Wireless Security Settings ........................ 42 Security Profile Configuration ....................... 42 Access Control ..........................44 RADIUS Settings ..........................45 Chapter 5 Management ........................47 View SGT-LD-5-23 Basic Information....................47 View Ethernet Statistics ........................48 View Wireless Statistics ........................49 Connection ............................50 Password ............................51 Remote Management ........................
  • Page 7 Appendix D. SSH Settings ......................... 73 Appendix E. GPL Declamation ......................78...
  • Page 8 FIGURE Figure 1 SGT-LD-5-23 ........................11 Figure 2 Telemedicine Wireless Broadband ..................13 Figure 3 Campus Wireless Broadband ....................14 Figure 4 Bracket Mounting – Step 1 ..................... 19 Figure 5 Bracket Mounting – Step 2 ..................... 19 Figure 6 Pole Mounting –Step 1 ......................20 Figure 7 Pole Mounting –...
  • Page 9 Figure 31 Access Control ........................44 Figure 32 RADIUS Settings ......................... 45 Figure 33 Basic Information ......................... 47 Figure 34 Ethernet Statistics ........................ 48 Figure 35 Wireless Statistics ........................ 49 Figure 36 Connection ........................... 50 Figure 37 Password ..........................51 Figure 38 Remote Management ......................
  • Page 10 TABLE Table 1 PIN Definition ........................... 21 Table 3 RSSI-Beep Frequency ......................40 Table 4 Channels in 5MHz Centre Frequency ..................66 Table 5 Channels in 10MHz Centre Frequency ................... 66 Table 6 Channels in 20MHz Centre Frequency ................... 67 Table 7 Channels in 40MHz Centre Frequency ...................

  • Page 11: Chapter 1 Introduction

    Designed for an outdoor environment application, the SGT-LD-5-23 is a high-performance outdoor-deployable wireless bridge that provides wireless connectivity among multiple network locations. The SGT-LD-5-23 has a built-in 23dBi flat panel antenna that can deliver data at distances in excess of 40km.

  • Page 12: Key Features

    Key Features Provide easy installation and high performance wireless connectivity of up to 50km IP67 waterproof housing endures almost any harsh environments Multiple operating modes including Base station, CPE, PTP and PTMP Support 64/128-bit WEP and 802.1X, WPA-PSK, WPA2-PSK and WPA-PSK&WPA2-PSK, etc. Supports WMM and Quality of Service (QoS) for enhanced performance Proprietary Antenna Alignment Tool helps identify the antenna orientation with the best signal strength...

  • Page 13: Typical Applications

    This section describes the typical applications of the SGT-LD-5-23. Telemedicine Wireless Broadband Application The SGT-LD-5-23 primary usage is as a relay or bridging technology that may be combined with a cost-effective solar power solution allowing for telemedicine application in remote and rural environments.

  • Page 14: Education Wireless Broadband Application

    Schools in remote or rural areas can be provided with broadband connectivity via local Internet service providers. The relay ability of the SGT-LD-5-23 allows for multiple hops to be made thus allowing the SGT-LD-5-23 to reach more remote LOS locations beyond 40km or to circumvent natural obstructions like mountains.

  • Page 15: Chapter 2 Hardware Installation

    If you are intended to use an external antenna with the SGT-LD-5-23, please contact your supplier/installer to ensure that your unit is set for you have fulfilled all the local regulatory requirements.

  • Page 16: Safety Precautions

    Installation Precautions To keep the SGT-LD-5-23 well while you are installing it, please read and follow these installation precautions. 1. Users MUST use a proper and well-installed surge arrestor and grounding kit with SGT-LD-5-23;...

  • Page 17: Product Package

    Product Package The product package you have received should contain the following items. If any of them are not included or damaged, please contact your local vendor for support. ×1 SGT-LD-5-23 LD with integrated 23dBi antenna ×1 Mounting Kit ×1 PoE Injector &...
  • Page 18 Waterproof RJ-45 Connector Kit ×1 1. Gland ×1 2. Sealing Nut ×1 3. Sealing Chapter 3 Basic Settings Page 18...

  • Page 19: Hardware Installation

    Assemble the Mounting Bracket Place the main bracket into the seating and use a spanner to fasten the bracket to the SGT-LD-5-23 with M5×16 screws ⑧ and M5 washers ⑨ provided in the hardware packets; Figure 4 Bracket Mounting – Step 1 Assemble the main bracket by placing articulation pole ②...
  • Page 20 Figure 7 Pole Mounting – Step 2 Adjust the antenna for appropriate tilt / vertical orientation. Figure 8 Pole Mounting – Step 3 Note: The horizontal and vertical beam width of SGT-LD-5-23 default antenna is about 10 degree respectively. Chapter 3 Basic Settings Page 20...

  • Page 21: Interface Definition

    To reset the device, short P7 (Hard Reset) to P8 (GND) for less than 1 second and the system will reset. If P7 (Hard Reset) is shorted to P8 (GND) for over 5 seconds, the SGT-LD-5-23 LD will be reset to the factory default settings.
  • Page 22 Vent The vent is designed to facilitate vapor and moisture egress out of the unit as well as to repel water, dust and dirt by using the specially designed membrane, thereby preventing the SGT-LD-5-23 from electric malfunctioning. Chapter 3 Basic Settings...

  • Page 23: Connect Up

    Before installing the Ethernet cable with a waterproof RJ-45 connector, it is recommended that the Cat-5 RJ-45 coaxial cable be used for the SGT-LD-5-23 to power PoE connector. To connect to the hole labelled PoE+Data, open the black cover in advance by using a coin or a slotted screwdriver and then screw in the body of the gland and tighten.

  • Page 24: Grounding

    Figure 16 Connect Up – Step 4 Grounding The SGT-LD-5-23 is shipped with a grounding wire. The unit must be properly grounded to protect against power surges. The grounding point can be found on the bottom of the unit. It is supplied with an appropriate grounding lug for attachment to the ODU.

  • Page 25: Power On

    After being powered on, the device will send out the beep sound lasting about 1.5 seconds, informing you that the SGT-LD-5-23 is powered up! Wait about 60 seconds - system will be initialized and start working. Figure 18 PoE Connection...
  • Page 26 Chapter 3 Basic Settings Page 26...

  • Page 27: Chapter 3 Basic Settings

    Chapter 3 Basic Settings Factory Default Settings We‟ll elaborate the SGT-LD-5-23 factory default settings. You can re-acquire these parameters by default. If necessary, please refer to the “Restore Factory Default Settings”. Table 2 SGT-LD-5-23 Factory Default Settings Features Factory Default Settings...

  • Page 28: System Requirements

    Configure the computer with a static IP address of 192.168.1.x, as the default IP address of SGT-LD-5-23 is 192.168.1.1, X cannot be 0, 1, nor 255; A Web browser on PC for configuration such as Microsoft Internet Explorer 6.0 or above or Firefox.

  • Page 29: How To Login The Web-Based Interface

    Enter the username (Default: admin) and password (Default: password) respectively and click “Login Now” to login to the main page of the SGT-LD-5-23. As you can see, this management interface provides four main options in the black bar above, which are System, Wireless, Status and Management.
  • Page 30 Figure 21 Main Page Note: The username and password are case-sensitive, and the password is no more than 19 characters! Chapter 3 Basic Settings Page 30...

  • Page 31: Basic System Setup

    If you select “Manual”, you have to specify a static IP address, subnet mask, default gateway and DNS server for your local area network which connects to the LAN port of the SGT-LD-5-23. Make sure the specified IP address is unique on your network in order to prevent IP conflict.

  • Page 32: Basic Wireless Settings

    Spanning Tree Protocol is a link management protocol for SGT-LD-5-23 bridges which provides path redundancy while preventing loops in a network. STP allows only one active path at a time between the SGT-LD-5-23 bridges but establish the redundant link as a backup if the initial link fails.
  • Page 33 Under this mode, only PTP is ‟s available and is suggested to use this mode when the distance between the two SGT-LD-5-23 greater than 20km. Base Station ID (SSID) For Base Station mode, it requires SSID for CPE clients to associate with.
  • Page 34 Super mode is an effective way to enhance performance. It can boost the transmission data rate up to 108Mbps. The SGT-LD-5-23 provides you with three kinds of Super mode, which are Fast Frame, Burst and Compression. To enable Super Mode, the remote SGT-LD-5-23 should also have this function enabled.

  • Page 35: Chapter 4 Advanced Settings

    Figure 24 Advanced Parameters RTS Threshold The SGT-LD-5-23 sends RTS (Request to Send) frames to certain receiving station and negotiates the sending of a data frame. After receiving an RTS, that STA responds with a CTS (Clear to Send) frame to acknowledge the right to start transmission. The setting range is 0 to 2346 in bytes.
  • Page 36 Specify the frequency interval to broadcast packets. Enter a value between 20 and 1000. Distance in Meters To decrease the chances of data retransmission at long distance, the SGT-LD-5-23 can auto adjust for proper ACK timeout value by specifying distance of the two nodes. Default distance is 10Km.

  • Page 37: Peer-To-Peer Links

    (CSMA) mode. Figure 25 Peer-to-Peer Links for CSMA To setup a Peer-to-Peer link, first login to the Web-based interface of the remote SGT-LD-5-23, open “About” in “System” and record its wireless MAC address. Then, login to the Web-based interface of the local SGT-LD-5-23 and open “Peer-to-Peer Setup”...
  • Page 38 The other way to establish PTMP connectivity is to setup the same group id under “Radio” in “Wireless”. This feature only available under Peer-to-Peer (TDMA) mode and only devices with the same Group ID can communicate. Figure 26 PTP/PTMP for TDMA Note: When establishing a PTMP network, make sure all the remote wireless devices are within the antenna beam width.

  • Page 39: Antenna Alignment Tool

    Antenna Alignment Tool Under Peer-to-Peer (CSMA) mode, the Antenna Alignment Tool is available. This function helps to point in the approximate direction of the remote SGT-LD-5-23 antenna and assists the user to easily align the local antenna to achieve maximum signal strength.

  • Page 40: Link Test

    Table 3 RSSI-Beep Frequency RSSI Beep Frequency >-50 100 /sec -50~-60 50 /sec -60~-70 5 /sec -70~-80 2 / sec -80~-90 1 /sec < -90 No beep sound Link Test Under Base Station, CPE or Peer-to-Peer (TDMA) mode, when the Antenna Alignment Tool is not available, Link Test provides another option to check the signal strength towards the connecting device.

  • Page 41: Super Mode

    Super Mode Super mode is an effective way to enhance the Wi-Fi performance; it can boost the transmission data rate. SGT-LD-5-23 provides you with three kinds of Super mode, which are Fast Frame, Burst and Compression. Open “Radio” in “Wireless”, Super Mode is in the red box as below:...

  • Page 42: Wireless Security Settings

    Hiding network name is necessary when you are in a wireless environment that may have potential risk. By using this function, the STA cannot scan and find SGT-LD-5-23, so that a malicious attack by some illegal STA can be avoided.
  • Page 43 Note: We strongly recommend you enable wireless security on your network! Only by setting the same Authentication, Data Encryption and Key in the SGT-LD-5-23 and other wireless devices that connect with it, can the communication be established. Chapter 5 Management...

  • Page 44: Access Control

    Figure 31 Access Control Available CPEs This table lists the CPEs currently connecting to the SGT-LD-5-23. Check the box before each MAC address, click “Add” to add one or more available CPE(s) into the “Trusted CPEs” and click “Apply” to save settings.

  • Page 45: Radius Settings

    IP Address: Enter the IP address of the Radius Server; Port Number: Enter the port number of the Radius Server; Shared Secret: This secret, which is composed of no more than 31 characters, is shared by the SGT-LD-5-23 and RADIUS during authentication. Chapter 5 Management Page 45...
  • Page 46 Advanced WPA/802.1X Parameters Re-authentication Time: Set the time interval between two authentications. Global-Key Update: Check this option and specify the time interval between two global-key updates. Chapter 5 Management Page 46...

  • Page 47: Chapter 5 Management

    Chapter 5 Management View SGT-LD-5-23 Basic Information Open “About” in “System” to check the basic information of the SGT-LD-5-23, which is read-only. Figure 33 Basic Information Chapter 5 Management Page 47...

  • Page 48: View Ethernet Statistics

    View Ethernet Statistics Open “Ethernet Status” in “Status” to check the data packets received and transmitted from the Ethernet port in LAN. Click “Refresh” to view current statistics. All are read-only. Figure 34 Ethernet Statistics Chapter 5 Management Page 48...

  • Page 49: View Wireless Statistics

    View Wireless Statistics Open “Wireless Status” in “Status” to check the data packets received and transmitted via the wireless network. Click “Refresh” to view current statistics. All are read-only. Figure 35 Wireless Statistics Chapter 5 Management Page 49...

  • Page 50: Connection

    Connection Open “Connection” in “Status” to check the information of remote CPE‟s connected to the bridge; these values also help determine if the antenna is aligned in an appropriate direction. The table will be updated every 30 seconds. All are read-only. Figure 36 Connection Chapter 5 Management Page 50...

  • Page 51: Password

    “Yes” and click “Apply” to default the password. Note: The password is case-sensitive and its length cannot exceed 19 characters! Remote Management The SGT-LD-5-23 provides you with two more options for device management, which are SSH (Secure Shell) and SNMP. Chapter 5 Management Page 51...

  • Page 52: Remote Console

    Open “Remote Management” in “Management” to configure the remote management of the SGT-LD-5-23. Figure 38 Remote Management Remote Console The SGT-LD-5-23 supports CLI management, which can be accessed by Secure Shell (SSH). It is recommended that PuTTY be used to login. Download it from http://www.putty.org/ for free. The minimum system requirement for using PuTTY is Windows 95, 98, ME, NT, 2000, XP and Vista on Intel x86.
  • Page 53 Figure 39 PuTTY Configuration 1 Chapter 5 Management Page 53...
  • Page 54 From “Connection” in the left menu bar, click “SSH”; select “2” as “Preferred SSH protocol version”; make “3DES” the top position in “Encryption cipher selection policy”; Figure 40 PuTTY Configuration 2 Click “Open”, a window as below will popup: Chapter 5 Management Page 54...

  • Page 55: Snmp

    Appendix C. SSH Settings for details. SNMP The SGT-LD-5-23 supports SNMP management. Set the SNMP parameters and obtain MIB file before remote management. From “Remote Management” in “Management”, set the parameters for SNMP: Enable SNMP by checking “Enable”; Specify the “Read Community Name”, “Write Community Name” and “IP Address to Receive Traps”...
  • Page 56 After successful login, enter command “get bridge.mib”, the information will as below and then bridge.mib file is obtained. Figure 42 Obtain MIB File Chapter 5 Management Page 56...

  • Page 57: Time Settings

    Time Settings Compliant with NTP, the SGT-LD-5-23 is capable of keeping its time in complete accord with Internet time. Make configuration in “Basic” from “System”: Figure 43 Time Settings Enter the time server IP address and port respectively in “Time Server” and “Time Server Port”...

  • Page 58: Upgrade Firmware

    Upgrade Firmware Open “Upgrade Firmware” in “Management” and follow the steps below to upgrade firmware locally or remotely through the SGT-LD-5-23‟s Web interface: Figure 44 Upgrade Firmware Chapter 5 Management Page 58...
  • Page 59 Click “Browse” to select the firmware file; Click “Upload” to load the file into the SGT-LD-5-23; Wait a moment, the system will reboot after successfully upgrade. Note: Do NOT cut the power off during the upgrade, otherwise the system may crash!

  • Page 60: Backup/Restore Settings

    Backup/Restore Settings It is strongly recommended to back up the configuration information in case of something unexpected. If an unforeseen problem hits your device, you may have access to restore the important files by the backup. All these can be done by the local or remote computer. Open “Backup/Restore Settings”...

  • Page 61: Restore Factory Default Settings

    Figure 46 Restore Settings Restore factory default settings via RS-232 If software in SGT-LD-5-23 has unexpectedly crashed and you can no longer reset the unit via the Web interface, you may do a hardware reset via RS-232. For detailed instructions please refer to Chapter 2 RS-232 section.

  • Page 62: Event Log

    Event Log The Event log is used for recording events occurring in the SGT-LD-5-23, including station connections, disconnections, system reboot and etc. Open “Event Log” in “Management” as below. Figure 47 Event Log Enable Log: Enable System log or not;...

  • Page 63: Reboot

    You can reboot your device from “Reboot” in “Management” as below: Figure 48 Reboot Check “Yes” and click “Apply” to reboot the SGT-LD-5-23. This takes a few minutes, during which the device will send out a buzzing sound, informing you that the system is rebooting.

  • Page 64: Chapter 6 Troubleshooting

    RJ-45 Jack of the unit. Green: The SGT-LD-5-23 is connecting to the backhaul network. Off: The SGT-LD-5-23 disconnects from the wired network; check if the power cord and Ethernet cables to the network and bridge are correctly connected.
  • Page 65  Check if the IP address of PC is correct (in the same network segment as the unit);  Log into the unit via other browsers such as Firefox.  Hardware reset the unit. Q 5. What if the signal quality is poor or not so good? ...

  • Page 66: Appendix A. Channel - Frequency Table

    Appendix A. Channel – Frequency Table The SGT-LD-5-23 can be operated in four different band widths, which are 5MHz, 10MHz, 20MHz and 40MHz. The following tables illustrate the channel with corresponding frequency in each bandwidth. Table 4 Channels in 5MHz Centre Frequency...
  • Page 67 Table 6 Channels in 20MHz Centre Frequency Channel Frequency 5.745 GHz 5.765 GHz 5.785 GHz 5.805 GHz 5.825 GHz Table 7 Channels in 40MHz Centre Frequency Channel Frequency 5.745GHz 5.785GHz 5.825GHz The availability of some specific channels and/or operational frequency bands are country dependent and are firmware programmed at the factory to match the intended destination.

  • Page 68: Appendix B. Channel - Country List Table

    Appendix B. Channel – Country List Table The SGT-LD-5-23 support country selection, there are different channel when select different country. The following tables list the channel with country code in each bandwidth. Table 8 Country of FCC Country Mode Channel list...
  • Page 69 Table 9 Country of European Union Country Mode Channel list 40Mhz 20Mhz 10Mhz 5Mhz 11bg (1-13) 1/2/3/4/5/6/78 1/2/3/4/5/6/7/8 1/2/3/4/5/6/7/8 Belgium *Ukraine /9/10/11/12/13 9/10/11/12/13 9/10/11/12/13 Bulgaria Excluded Croatia CH12-CH13 Cyprus Czech Republic Estonia Finland F.Y.R.O.Mac edonia France 100/108/116 100/104/108/112 100/102/104/106/ 100/101/102/103/ Germany (5470～5725) 116/136/140...
  • Page 70 Table 10 Other Countries Country Mode Channel list 40Mhz 20Mhz 10Mhz 5Mhz 11bg 1/2/3/4/5/6/7/8/9/ 1/2/3/4/5/6/7/8/9/10 1/2/3/4/5/6/7/8 10/11/12/13 /11/12/13 9/10/11/12/13 100/108/116/ 100/104/108/112/ 99/101/103/105 99/100/101/102 (5470～5725) 116/136/140 /107/109/111/113 /103/104/105/106 Excluded /115/117/119/133 /107/108/109/110 CH120~CH131 /135/137/139/141 /111/112/113/114 Meteorology /115/116/117/118 Radars /119/133/135/136 /137/138/139/140 /141 *Ireland Liechtenstein (5725~5875) 151/167...
  • Page 71 11bg 1/2/3/4/5/6/7/8/9/ 1/2/3/4/5/6/7/8 1/2/3/4/5/6/7/8 (1-13) 10/11/12/13 9/10/11/12/13 9/10/11/12/13 100/108/ 100/104/108/112/ 99/101/103/105 99/100/101/102 (5470～5725) 116/140 116/136/140 /107/109/111/113 /103/104/105/106 Excluded /115/117/119/133/ /107/108/109/110 CH120~CH131 135/137/139/141 /111/112/113/114 Meteorology /115/116/117/118 Radars /119/133/135/136 /137/138/139/140 /141 (5725~5850) 151/167 147/151/155/167 146/148/150/152 146/147/148/149/ Excluded /154/156/158/164 150/151/152/153/ 5795~5815 /166/168 154/155/156/157/ 158/162/163/164/ 165166/167/168/ Appendix B.

  • Page 72: Appendix C. Ascii

    Appendix C. ASCII WEP can be configured with a 64-bit or 128-bit Shared Key (hexadecimal number or ACSII). As defined, hexadecimal number is represented by 0-9, A-F or a-f; ACSII is represented by 0-9, A-F, a-f or punctuation. Each one consists of two-digit hexadecimal. Table 11 ACSII ASCII ASCII...
  • Page 73 Appendix D. SSH Settings Table 12 SSH Settings Keyword Descriptions √ √ time --time setting √ -now --current system time √ √ -zone --time zone √ √ -daylight saving -- daylight saving √ √ -server --time server setting --time server (domain name √...
  • Page 74 √ √ -ipaddr --radius IP address √ √ -port --radius port number √ √ -secret --radius secret string √ √ √ -wpa --wireless WPA setting --wireless re-auth √ √ -reauthtime period(in seconds) --enable wireless √ √ -keyupdate global update condition --wireless WPA global key √...
  • Page 75 √ √ -bandwidth --wireless bandwidth √ √ -cpe mode --use multicli or lan-to-lan -cpedownflowwi --wireless down flow width √ √ for CPE mode √ √ -OutputPower --wireless transmit power √ √ -VQoS/TDM --enable TDM mode or not √ √ -tdm timeslice --station‟s timeslice value -fragmentationt --wireless...
  • Page 76 mode -macaddre --remote AP mac address √ √ √ for pxp mode --down flow width for pxp √ √ -bandwidth mode --remote AP status or active √ -status for pxp mode √ -ipaddr --remote AP ipaddr √ -rssi --remote AP rssi remote AP for pxp √...
  • Page 77 √ -remoterssi --remote bs and rssi √ √ -wmm --wmm settngs √ √ -super_audio --Fast_Frame settings √ √ -super_video --super burst settings √ √ -super_picture --compression settings √ √ √ --<null> --network name this √ √ -ssid bs(1-32 chars) --bs ssid broadcast √...
  • Page 78 Appendix E. GPL Declamation PUBLIC SOFTWARE DECLAMATION In the software we delivered, there are may contain some public software, if it is, please read below carefully: 1. Definition “Public Software”, when applicable, shall mean that portion of the Licensed Software, in source code form, set forth in the below Table, and provided under the terms set forth in the Section 5, the indicated website, the complete license terms can be found .
  • Page 79 3. Limited Liability The supplier hereby express that the supplier shall have no liability for any costs, loss or damages resulting from Licensee‟s breach of the terms and conditions applicable to use, conversion or combination of the licensed software with or into Public Software. 4.
  • Page 80 ourceforg e/bridge/br idge-utils- 1.0.6.tar.gz dropbear Copyright http://matt. GNU GENERAL PUBLIC http://www.gnu.o 2002-2006 Matt ucc.asn.au LICENSE Version 2 rg/licenses/old-li Johnston /dropbear/ censes/gpl-2.0.ht Portions copyright (c) dropbear- 2004 Mihnea 0.51.tar.bz Stoenescu hostapd Copyright http://host GNU GENERAL PUBLIC http://www.gnu.o 2002-2006, Jouni ap.epitest. LICENSE Version 2 rg/licenses/old-li Malinen fi/releases/...
  • Page 81 g/users/ce censes/gpl-2.0.ht vans/vsftp d-1.1.2.tar. linux ftp://ftp.ker GNU GENERAL PUBLIC http://www.gnu.o nel.org/pu LICENSE Version 2 rg/licenses/old-li b/linux/ker censes/gpl-2.0.ht nel/v2.6/lin ux-2.6.20.3 .tar.bz2 Appendix E. GPL Declamation Page 81...

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