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Part No. DUA1740-0AAA03 Rev. 01
Published September 2004

SuperStack

3 Switch 3812, Switch 3824, and

Switch 3848
Getting Started Guide

3C17401
3C17400
3CR17402-91

dua1740-0aaa03.book Page 1 Thursday, December 23, 2004 9:23 PM

Содержание 3C17400

Страница 1: ... Part No DUA1740 0AAA03 Rev 01 Published September 2004 SuperStack 3 Switch 3812 Switch 3824 and Switch 3848 Getting Started Guide 3C17401 3C17400 3CR17402 91 dua1740 0aaa03 book Page 1 Thursday December 23 2004 9 23 PM ...

Страница 2: ... in or delivered to you in conjunction with this User Guide Unless otherwise indicated 3Com registered trademarks are registered in the United States and may or may not be registered in other countries 3Com the 3Com logo and SuperStack are registered trademarks of 3Com Corporation Intel and Pentium are registered trademarks of Intel Corporation Microsoft MS DOS Windows and Windows NT are registere...

Страница 3: ... T 100BASE TX 1000BASE T Ports 14 Dual Personality SFP Ports 14 Console Port 14 LEDs 15 Switch Rear View Detail 16 Power Socket 17 Redundant Power System Socket Switch 3848 only 17 Default Settings 17 2 INSTALLING THE SWITCH Package Contents 20 Choosing a Suitable Site 20 Rack mounting 21 Placing Units On Top of Each Other 22 The Power up Sequence 23 Powering up the Switch 23 Checking for Correct ...

Страница 4: ...Console Port 36 Methods of Managing a Switch 39 Command Line Interface Management 39 Web Interface Management 40 SNMP Management 40 Setting Up Command Line Interface Management 40 CLI Management via the Console Port 41 CLI Management over the Network 41 Setting Up Web Interface Management 42 Pre requisites 42 Web Management Over the Network 43 Setting Up SNMP Management 43 Pre requisites 43 Defaul...

Страница 5: ...able 61 RJ 45 Pin Assignments 61 C TECHNICAL SPECIFICATIONS Switch 3812 Switch 3824 and Switch 3848 63 D OBTAINING SUPPORT FOR YOUR PRODUCT Register Your Product to Gain Service Benefits 65 Purchase Value Added Services 65 Troubleshoot Online 65 Access Software Downloads 66 Contact Us 66 Telephone Technical Support and Repair 66 INDEX REGULATORY NOTICES dua1740 0aaa03 book Page 5 Thursday December...

Страница 6: ...dua1740 0aaa03 book Page 6 Thursday December 23 2004 9 23 PM ...

Страница 7: ...h gives you detailed information on how to use the web interface and command line interface to manage the Switch Other documentation relating to the 3Com SuperStack 3 Switch 3812 Switch 3824 or Switch 3848 3Com Network Supervisor a powerful network management tool for small to medium enterprise networks A number of other useful applications If the information in the release notes that are shipped ...

Страница 8: ...se the following syntax system password password In this example you must supply a password for password Commands The word command means that you must enter the command exactly as shown and then press Return or Enter Commands appear in bold Example To display port information enter the following command bridge port detail The words enter and type When you see the word enter in this guide you must ...

Страница 9: ...he CD ROM that accompanies the Switch Management Interface Reference Guide This guide provides detailed information about the web interface and command line interface that enable you to manage the Switch It is supplied in HTML format on the CD ROM that accompanies the Switch There are other publications you may find useful Documentation accompanying the SFP Transceivers Documentation accompanying ...

Страница 10: ...essed using the index htm file The PDF Implementation Guide is stored in the Docs implementation directory of the CD ROM 3Com recommends that you copy the Docs referenceguide directory as a whole to maintain the structure of the files Documentation Comments Your suggestions are very important to us They will help make our documentation more useful to you Please e mail comments about this document ...

Страница 11: ...tion about the Switch 3812 Switch 3824 and Switch 3848 and how they can be used in your network It covers summary information about the hardware and the following topics About the Switch Switch Front View Detail Switch Rear View Detail Default Settings dua1740 0aaa03 book Page 11 Thursday December 23 2004 9 23 PM ...

Страница 12: ...erence Guide on the CD ROM that accompanies the Switch Summary of Hardware Features Table 3 summarizes the hardware features that are supported by the Switch 3812 Switch 3824 and Switch 3848 Table 3 Hardware features Feature Switch 3812 Switch 3824 and Switch 3848 MAC Addresses Up to 16 000 supported Forwarding Modes Store and Forward Auto negotiation Supported on all ports Auto MDI MDIX Supported...

Страница 13: ...iew Figure 2 Switch 3824 front view RPS Support Connects to SuperStack 3 Advanced Redundant Power System ARPS Switch 3848 only Mounting 19 inch rack or stand alone mounting Feature Switch 3812 Switch 3824 and Switch 3848 dua1740 0aaa03 book Page 13 Thursday December 23 2004 9 23 PM ...

Страница 14: ... and flow control modes of a link are automatically detected to provide the highest available bandwidth with the link partner Alternatively auto negotiation can be disabled These ports can be manually configured to 10 Mbps half duplex 100 Mbps half duplex 10 Mbps full duplex or 100 Mbps full duplex It is not possible to manually configure a 1000 Mbps link as auto negotiation is mandatory in the 10...

Страница 15: ...e is set to autobaud up to a maximum of 19 200 baud 8 data bits no parity and 1 stop bit LEDs Table 4 lists LEDs visible on the front of the Switch and how to read their status according to color For information on using the LEDs for problem solving see Checking for Correct Operation of LEDs on page 23 Table 4 LED behavior LED Color Indicates Port Status Packet LEDs Green A high speed 1000 Mbps li...

Страница 16: ...dy for use Red A fault has occurred Red flashing An internal fan has failed Off The unit is booting up Power Self Test LED Switch 3848 only Green The Switch is powered up and operating normally Green flashing The Switch is either downloading software or is initializing which includes running a Power On Self Test Yellow The Switch is faulty Off The Switch is not receiving power or there is a fault ...

Страница 17: ...824 and Switch 3848 If you initialize one of the Switch units it is returned to these defaults Table 5 Default Settings Redundant Power System Socket Power Socket Feature Switch 3812 Switch 3824 or Switch 3848 Port Status Enabled Port Speed Auto negotiated Duplex Mode Auto negotiated Flow Control Disabled Broadcast Storm Control Enabled Threshold 3000 broadcast frames per second Virtual LANs VLANs...

Страница 18: ...by selecting System Control Initialize in the Web interface or by entering system control initialize in the Command Line Interface the following settings are retained to allow you to connect to and manage the Switch IP Address Subnet Mask Default Gateway dua1740 0aaa03 book Page 18 Thursday December 23 2004 9 23 PM ...

Страница 19: ... procedures you must read the safety information provided in Appendix A of this guide AVERTISSEMENT Consignes de sécurité Avant d installer ou d enlever tout composant de Switch ou d entamer une procédure de maintenance lisez les informations relatives à la sécurité qui se trouvent dans l Appendice A de ce guide VORSICHT Sicherheitsinformationen Bevor Sie Komponenten aus dem Schalter entfernen ode...

Страница 20: ... that have a high audible output while running at full speed The Switch is designed to reduce the fan speed shortly after power on if thermal conditions allow which will also reduce the fan noise generated When deciding where to position the Switch ensure that Cabling is located away from sources of electrical noise such as radios transmitters and broadband amplifiers power lines and fluorescent l...

Страница 21: ...p of one another if the units are free standing Rack mounting The Switch is 1U high and will fit in most standard 19 inch racks CAUTION Disconnect all cables from the Switch before continuing Remove all self adhesive pads from the underside of the Switch if they have been fitted CAUTION If you use a shelf or support ensure that it will not obstruct the air flow through the side panels of the Switc...

Страница 22: ...holes are not obstructed 6 Connect network cabling Placing Units On Top of Each Other If the Switch units are free standing up to four units can be placed one on top of the other If you are mixing a variety of Switch and Hub units the smaller units must be positioned at the top If you are placing Switch units one on top of the other you must use the self adhesive rubber pads supplied Apply the pad...

Страница 23: ...ctly Table 6 shows possible colors for the LED Table 6 Unit Status Colors If there is evidence of a problem see Solving Problems Indicated by LEDs on page 46 for a list of suggested solutions CAUTION The Switch has no ON OFF switch the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord Connecting a Redundant Power Supply Switch 3848 only You can...

Страница 24: ... over cable MDIX The Auto MDIX feature only operates when auto negotiation is enabled If auto negotiation is disabled all the Switch ports are configured as MDIX cross over If you want to make a connection to another MDIX port you need a cross over cable Many ports on workstations and servers are configured as MDI straight through If you want to make a connection to an MDI port you need to use a s...

Страница 25: ...ransceivers are hot insertable and hot swappable You can remove them from and insert them into any SFP port without having to power down the Switch Approved SFP Transceivers The following list of approved SFP transceivers is correct at the time of publication 3CSFP91 SFP SX 3CSFP92 SFP LX 3CSFP97 SFP LH70 To access the latest list of approved SFP transceivers for the Switch on the 3Com Corporation...

Страница 26: ...ed correctly It is not necessary to power down your Switch 2 Hold the transceiver so that the connector is toward you and the product label is visible Ensure the wire release lever is closed in the upright position 3 Gently slide the transceiver into the SFP port until it clicks If the transceiver does not click into place remove it turn it over and re insert 4 Remove the plastic protective cover ...

Страница 27: ...rmation Removing an SFP Transceiver If you wish to remove the transceiver it is not necessary to power down your Switch 1 Disconnect the cable from the transceiver 2 Move the wire release lever downwards until it is pointing toward you 3 Pull the wire release lever toward you to release the catch mechanism the transceiver will then easily slide out Product label Suitable port on host Switch dua174...

Страница 28: ...28 CHAPTER 2 INSTALLING THE SWITCH dua1740 0aaa03 book Page 28 Thursday December 23 2004 9 23 PM ...

Страница 29: ...to improve the efficiency of the Switch and therefore the overall performance of your network This chapter explains the initial set up of the Switch and the different methods of accessing the management software to manage a Switch It covers the following topics Setting Up Overview Manually Configuring IP Information Viewing Automatically Configured IP Information Methods of Managing a Switch Setti...

Страница 30: ...p the Switch IP Information is automatically configured See page 31 Do you want to manually configure the IP information Connect to a front panel port and use the Web Interface or Command Line Interface See page 32 How do you want to manage your Switch See page 39 SNMP See page 43 Command Line Interface Connect via the console port See page 41 Web Interface Connect over the network via Telnet See ...

Страница 31: ...u to allocate static IP addresses Static IP addresses are necessary to ensure that the Switch is always allocated the same IP information For most installations 3Com recommends that you configure the Switch IP information manually This makes management simpler and more reliable as it is not dependent on a DHCP server and eliminates the risk of the IP address changing If you wish to manually enter ...

Страница 32: ...nt Once your Switch s initial set up is complete you can set up your chosen management method as described in Methods of Managing a Switch on page 39 For detailed information about the specific web interface operations and command line interface commands and problem solving refer to the Management Interface Reference Guide on the CD ROM that is supplied with the Switch or on the 3Com Web site Manu...

Страница 33: ...u can find pin out diagrams for the cables in Appendix B on page 59 You need to have the following so that you can manually set up the Switch with IP information IP address subnet mask default gateway Connecting the Workstation to the Switch 1 Connect the workstation to the console port using a standard null modem cable Switch 3812 and Switch 3824 or an RJ 45 to DB9 converter cable and a standard ...

Страница 34: ...ult settings for the Switch which are 19 200 baud 8 data bits no parity 1 stop bit no hardware flow control Refer to the documentation that accompanies the terminal emulation software for more information Setting Up the Switch with IP Information You are now ready to manually set up the Switch with IP information using the command line interface 1 The command line interface login sequence begins a...

Страница 35: ...ateway IP address for the Switch The screen displays a summary of the information entered If using the gettingStarted command you will then be prompted to enter system information change passwords and then given the option to carry out advanced configuration The initial set up of your Switch is now complete and the Switch is ready for you to set up your chosen management method See Methods of Mana...

Страница 36: ...om Network Supervisor and run the Auto discovery wizard 3Com Network Supervisor will auto discover the new Switch and display the IP information that has been automatically allocated to the Switch Most DHCP servers allow static IP addresses to be configured so that you know what IP address the Switch will be given Refer to the documentation that accompanies your DHCP server If your network does no...

Страница 37: ...wn in Figure 11 Figure 11 Connecting a workstation to the Switch via the console port To connect the cable a Insert the RJ 45 end of the RJ 45 to DB9 converter cable into the console port b Connect the null modem cable to the DB9 end of the converter cable c Connect the other end of the null modem cable to one of the serial ports also known as a COM port on your workstation 2 Open your terminal em...

Страница 38: ...e 2 The command line interface login sequence begins as soon as the Switch detects a connection to its console port If the login prompt does not begin immediately press Return a few times until it starts 3 At the login and password prompts enter admin as your user name and press Return at the password prompt If you have logged on correctly the top level menu of the command line interface is displa...

Страница 39: ...llowing methods Command line interface management Web interface management SNMP management Command Line Interface Management Each Switch has a command line interface CLI that allows you to manage the Switch from a workstation either locally via a console port connection see Figure 13 or remotely over the network see Figure 14 Figure 13 CLI management via the console port Figure 14 CLI management o...

Страница 40: ...nagement Protocol SNMP as shown in Figure 16 For example you can use the 3Com Network Supervisor software that is provided on the CD ROM that accompanies your Switch Figure 16 SNMP management over the network Refer to Setting Up SNMP Management on page 43 Setting Up Command Line Interface Management This section describes how you can set up command line interface management using a local console p...

Страница 41: ...a ping command at the DOS prompt in the following format c ping xxx xxx xxx xxx where xxx xxx xxx xxx is the IP address of the Switch If you get an error message check that your IP information has been entered correctly and the Switch is powered up 4 To open a Telnet session via the DOS prompt enter the IP address of the Switch that you wish to manage in the following format telnet xxx xxx xxx xxx...

Страница 42: ...ctly JavaScript and Cascading Style Sheets must be enabled on your browser These features are enabled on a browser by default You will only need to enable them if you have changed your browser settings To enable style sheets in Netscape Navigator 4 76 on Solaris 2 6 open Netscape Navigator and select Edit Preferences Fonts Select the Use document specified fonts including Dynamic Fonts radio butto...

Страница 43: ... admin as your user name and press Return at the password prompt or the password of your choice if you have already modified the default passwords 5 Click on the Device View button to display the web management options Setting Up SNMP Management Any network management application running the Simple Network Management Protocol SNMP can manage a Switch if The correct Management Information Bases MIB...

Страница 44: ...ree default passwords as soon as possible even if you do not intend to actively manage your Switch Table 9 Default Users Use the admin default user name no password to login and carry out initial Switch setup Changing Default Passwords You can change the default passwords using either The gettingStarted command on the CLI or The security device user modify command on the CLI or The Security Device...

Страница 45: ...Indicated by LEDs Solving Hardware Problems Solving Communication Problems Solving Software Upgrade Problems If you experience a problem that is not listed here it may be included in the support section of the Switch Management Interface Reference Guide on the CD ROM that accompanies your Switch For Technical Support information see Appendix D dua1740 0aaa03 book Page 45 Thursday December 23 2004 ...

Страница 46: ...matically disabled You can verify this by checking that the Port Status LED is flashing Green Yellow fast This could be due to a loop back failure If a port fails the Switch passes its Power On Self Test and continues to operate normally An internal fan has malfunctioned If a fan has stopped spinning power off the unit and check the air vents for obstructions If this situation occurs the fault LED...

Страница 47: ... the lifetime of the Switch The monitoring system polls the fan status at periodic intervals while the unit is powered up Should one or more fans fail within the Switch a warning message will be generated in the following ways RMON Trap if configured an RMON trap is generated and sent to the management workstation Command Line Interface an indication of a general hardware failure is provided throu...

Страница 48: ...ix C 4 Power cycle the unit If a further thermal shutdown trap is received return the unit Unit fails or SNMP thermal shutdown trap is received 1 Power cycle the unit To do this remove and reconnect the AC mains supply 2 Check the command line interface system summary command to determine whether a thermal shutdown has occurred 3 If no return the unit If yes check that The air vents are not obstru...

Страница 49: ...lt gateway IP address within the Switch is the same as the IP address of the router The Switch s IP address has been entered correctly in your network management application for example 3Com Network Supervisor The following is an brief overview of IP addressing and how to obtain a registered IP address IP Addressing To be managed correctly each device on your network for example a Switch or Hub mu...

Страница 50: ...ing used by another device on your network 3Com suggests you use addresses in the range 192 168 0 0 to 192 168 255 255 with a subnet mask of 255 255 255 0 These suggested IP addresses are part of a group of IP addresses that have been set aside specially for use in house only Solving Software Upgrade Problems You can upgrade the management software of the Switch by using the System Control Softwar...

Страница 51: ... consignes suivantes de sécurité avant d installer ou de retirer l appareil VORSICHT Vorsicht enthalten Anweisungen die Sie zu Ihrer eigenen Sicherheit befolgen müssen Alle Anweisungen sind sorgfältig zu befolgen Sie müssen die folgenden Sicherheitsinformationen sorgfältig durchlesen bevor Sie das Gerät installieren oder ausbauen Alle Verfahren die in dieser Anleitung beschrieben werden gelten für...

Страница 52: ...d Canada The cord set must be UL approved and CSA certified The minimum specification for the flexible cord is No 18 AWG Type SV or SJ 3 conductor The cord set must have a rated current capacity of at least 10A The attachment plug must be an earth grounding type with a NEMA 5 15P 15A 125V or NEMA 6 15P 15A 250V configuration United Kingdom only The supply plug must comply with BS1363 3 pin 13 amp ...

Страница 53: ...cting a modem to the console port of the Switch only use a modem which is suitable for connection to the telecommunications system WARNING RJ 45 Ports These are shielded RJ 45 data sockets They cannot be used as standard traditional telephone sockets or to connect the unit to a traditional PBX or public telephone network Only connect RJ 45 data connectors network telephony systems or network telep...

Страница 54: ... un branchement sur une entrée d appareil EN60320 CEI 320 Etats Unis et Canada Le cordon doit avoir reçu l homologation des UL et un certificat de la CSA Le cordon souple doit respecter à titre minimum les spécifications suivantes calibre 18 AWG type SV ou SJ à 3 conducteurs Le cordon doit être en mesure d acheminer un courant nominal d au moins 10 A La prise femelle de branchement doit être du ty...

Страница 55: ...ortant l appellation Neutre et avec raccordement direct à la terre masse AVERTISSEMENT Points d accès RJ 45 Ceux ci sont protégés par des prises de données Ils ne peuvent pas être utilisés comme prises de téléphone conventionnelles standard ni pour la connection de l unité à un réseau téléphonique central privé ou public Raccorder seulement connecteurs de données RJ 45 systèmes de réseaux de télép...

Страница 56: ...endet werden soll VORSICHT Der Gerätestecker der Anschluß an das Gerät nicht der Wandsteckdosenstecker muß eine passende Konfiguration für einen Geräteeingang gemäß EN60320 IEC320 haben VORSICHT Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein Die Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen werden VORSICHT Eu...

Страница 57: ...ützte oder ungeschützte Buchsen dürfen an diese Datensteckdosen angeschlossen werden VORSICHT Faseroptikanschlüsse Optische Sicherheit Niemals ein Übertragungslaser betrachten während dieses eingeschaltet ist Niemals direkt auf die Faseransnchlüsse und auf die Faserkabelenden schauen während diese eingeschaltet sind VORSICHT Die Verwendung von Steuerelementen oder die Anpassung von Leistungen und ...

Страница 58: ...58 APPENDIX A SAFETY INFORMATION dua1740 0aaa03 book Page 58 Thursday December 23 2004 9 23 PM ...

Страница 59: ...B PIN OUTS Null Modem Cable Figure 17 9 pin to RS 232 25 pin Switch 3812 and Switch 3824 Figure 18 RJ 45 to RS 232 25 pin Switch 3848 dua1740 0aaa03 book Page 59 Thursday December 23 2004 9 23 PM ...

Страница 60: ...60 APPENDIX B PIN OUTS PC AT Serial Cable Figure 19 9 pin to 9 pin Switch 3812 and Switch 3824 Figure 20 RJ 45 to 9 pin Switch 3848 dua1740 0aaa03 book Page 60 Thursday December 23 2004 9 23 PM ...

Страница 61: ...ents Pin assignments are identical for 10 100 and 1000 RJ 45 connectors Table 10 Pin assignments Pin Number 10 100 1000 Ports configured as MDI 1 Transmit Data Bidirectional Data A 2 Transmit Data Bidirectional Data A 3 Receive Data Bidirectional Data B 4 Not assigned Bidirectional Data C dua1740 0aaa03 book Page 61 Thursday December 23 2004 9 23 PM ...

Страница 62: ...100 1000 Ports configured as MDIX 1 Receive Data Bidirectional Data B 2 Receive Data Bidirectional Data B 3 Transmit Data Bidirectional Data A 4 Not assigned Bidirectional Data D 5 Not assigned Bidirectional Data D 6 Transmit Data Bidirectional Data A 7 Not assigned Bidirectional Data C 8 Not assigned Bidirectional Data C Pin Number 10 100 1000 dua1740 0aaa03 book Page 62 Thursday December 23 2004...

Страница 63: ...dity non condensing Standards EN60068 to 3Com schedule package testing paras 2 1 2 2 2 30 and 2 32 Operational testing paras 2 1 2 2 2 30 and 2 13 Safety Agency Certifications UL 60950 EN60950 CSA 22 2 No 60950 IEC 60950 IEC825 1 EN60825 1 EMC Emissions CISPRR 22 Class A EN55022 Class A FCC Part 15 Subpart B Class A ICES 003 Class A VCCI Class A EN61000 3 2 EN61000 3 3 Immunity EN 55024 Power Cons...

Страница 64: ...TECHNICAL SPECIFICATIONS Input Voltage Options 100 240 VAC Current Rating 0 44 A maximum Switch 3812 0 69 A maximum Switch 3824 1 25 A maximum Switch 3848 dua1740 0aaa03 book Page 64 Thursday December 23 2004 9 23 PM ...

Страница 65: ...t software upgrades onsite assistance or advance hardware replacement Experienced engineers are available to manage your installation with minimal disruption to your network Expert assessment and implementation services are offered to fill resource gaps and ensure the success of your networking projects More information on 3Com Extended Warranty and Professional Services is available at http www 3...

Страница 66: ...sion included with your original product In order to access upgrades and related documentation you must first purchase a service contract from 3Com or your reseller Contact Us 3Com offers telephone e mail and internet access to technical support and repair services To access these services for your region use the appropriate telephone number URL or e mail address from the list below You will find ...

Страница 67: ... 801 777 0800 446 398 61 2 9937 5083 Philippines P R of China Singapore S Korea Taiwan Thailand 1235 61 266 2602 or 1800 1 888 9469 800 810 3033 800 6161 463 080 333 3308 00801 611 261 001 800 611 2000 You can also obtain support in this region using the following e mail apr_technical_support 3com com Or request a repair authorization number RMA by fax using this number 65 543 6348 Europe Middle E...

Страница 68: ...alvador Trinidad and Tobago Uruguay Venezuela Virgin Islands AT T 800 998 2112 57 1 657 0888 AT T 800 998 2112 1 800 998 2112 571 657 0888 01 800 849CARE AT T 800 998 2112 AT T 800 998 2112 54 11 4894 1888 AT T 800 998 2112 1 800 998 2112 AT T 800 998 2112 1 800 998 2112 AT T 800 998 2112 AT T 800 998 2112 57 1 657 0888 You can also obtain support in this region using the following Spanish speaker...

Страница 69: ... a default user 44 M management methods 39 preparing for 32 setting up 29 30 manual setup console port 32 MDI configuration 24 MDIX configuration 24 P passwords of default users 44 pin assignments modem cable 61 null modem cable 59 RJ45 61 serial cable 60 pin outs 59 ports 10 100 100 14 power socket 17 powering up the Switch 23 problem solving 45 communication problems 49 hardware problems 47 IP a...

Страница 70: ...on 24 Switch automatic setup 36 dimensions 63 features 12 installation 19 21 powering up 23 rack mounting 21 size 63 weight 63 system specifications 63 T troubleshooting 45 W web interface management 40 setting up 42 dua1740 0aaa03 book Page 70 Thursday December 23 2004 9 23 PM ...

Страница 71: ...d receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D...

Страница 72: ...dua1740 0aaa03 book Page 72 Thursday December 23 2004 9 23 PM ...

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