3Com 3CR17500-91 Getting Started Manual Download

Page: 26 / 70

HAPTER

2: I

NSTALLING

THE

WITCH

■

1000BASE-SX or 1000BASE-LX media type:

■

1000BASE-SX SFP transceiver

Use this transceiver to connect the Switch directly to a multimode
fiber-optic cable.

■

1000BASE-LX SFP transceiver

Use this transceiver to connect the Switch directly to a single-mode
fiber-optic cable or to multimode fiber using a conditioned launch
cable.

■

Fiber LC connector

If the SFP transceiver is faulty, it will not operate within the Switch. See
“Solving Hardware Problems” on page 47.

Use of non-3Com SFPs is not recommended. If the SFP transceiver is
invalid it will not be recognized by the Switch.

Use the following sequence of steps to activate the SFP ports:

Hold the transceiver so that the fiber connector is toward you and the
product label is visible, as shown in Figure 6. Ensure the wire release lever
is closed (in the upright position).

Gently slide the transceiver into the SFP port until it clicks into place.

CAUTION:

SFP transceivers are keyed and can be properly inserted only

one way. If the transceiver does not click when you insert it, remove it,
turn it over, and reinsert it.

Remove the plastic protective cover if fitted.

Connect the fiber cable.

DUA1750-0AAA01.book Page 26 Friday, December 5, 2003 10:24 AM

Summary of Contents for 3CR17500-91

Page 1: ... www 3com com Part No DUA1750 0AAA01 Published December 2003 SuperStack 3 Switch 3226 and Switch 3250 Getting Started Guide 3CR17500 91 3CR17501 91 DUA1750 0AAA01 book Page 1 Friday December 5 2003 10 24 AM ...

Page 2: ...e Unless otherwise indicated 3Com registered trademarks are registered in the United States and may or may not be registered in other countries 3Com SuperStack and the 3Com logo are registered trademarks of 3Com Corporation IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers Inc Intel and Pentium are registered trademarks of Intel Corporation Microsoft M...

Page 3: ...h 12 Summary of Hardware Features 12 Switch Front View Detail 13 10BASE T 100BASE TX Ports 13 10BASE T 100BASE TX 1000BASE T Ports 14 SFP Ports 14 LEDs 14 Console Port Switch 3226 15 Switch Rear View Detail 16 Power Socket 16 Redundant Power System Socket 16 Console Port Switch 3250 16 Default Settings 17 2 INSTALLING THE SWITCH Package Contents 20 Choosing a Suitable Site 20 DUA1750 0AAA01 book P...

Page 4: ...ation 33 Connecting to the Console Port 33 Viewing Automatically Configured IP Information 36 Using 3Com Network Supervisor 36 Connecting to the Console Port 36 Methods of Managing a Switch 39 Command Line Interface Management 39 Web Interface Management 39 SNMP Management 40 Setting Up Command Line Interface Management 40 CLI Management via the Console Port 40 CLI Management over the Network 41 S...

Page 5: ...cherheitsinformationen 56 B PIN OUTS Null Modem Cable 59 PC AT Serial Cable 59 RJ 45 Pin Assignments 60 C TECHNICAL SPECIFICATIONS SuperStack 3 Switch 3226 and Switch 3250 61 D OBTAINING SUPPORT FOR YOUR PRODUCT Register Your Product to Gain Service Benefits 63 Purchase Value Added Services 63 Troubleshoot Online 63 Access Software Downloads 64 Contact Us 64 Telephone Technical Support and Repair ...

Page 6: ...DUA1750 0AAA01 book Page 6 Friday December 5 2003 10 24 AM ...

Page 7: ...nd setting up network equipment consequently it assumes a basic working knowledge of LANs Local Area Networks Before You Start This section contains information about the CD ROM that accompanies your Switch About Your CD ROM The CD ROM also contains the following Online documentation for the Switch refer to Related Documentation on page 9 for details 3Com Network Supervisor a powerful and easy to ...

Page 8: ...use 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...

Page 9: ...e Switch It is supplied in HTML format on the CD ROM that accompanies the Switch Release Notes These notes provide information about the current software release including new features modifications and known problems There are other publications you may find useful such as Documentation accompanying 3Com Network Supervisor This is supplied on the CD ROM that accompanies the Switch Accessing Onlin...

Page 10: ...cumentation more useful to you Please e mail comments about this document to 3Com at pddtechpubs_comments 3com com Please include the following information when commenting Document title Document part number on the title page Page number if appropriate Example Superstack 3 Switch 3226 and Switch 3250 Getting Started Guide Part Number DUA1750 0AAA01 Page 21 Please note that we can only respond to c...

Page 11: ... about the Switch 3226 and Switch 3250 and how they can be used in your network It covers summaries of hardware and software features and also the following topics About the Switch Switch Front View Detail Switch Rear View Detail Default Settings DUA1750 0AAA01 book Page 11 Friday December 5 2003 10 24 AM ...

Page 12: ...eatures that are supported by the Switch Table 3 Hardware features Feature Switch MAC Addresses Up to 8000 supported Up to 200 static entries Auto negotiation Supported on all ports Auto MDI MDI X Supported on all ports Forwarding Modes Store and Forward Duplex Modes Half and full duplex on all ports Traffic Prioritization Supported using the IEEE Std 802 ID 1998 Edition 4 queues per port Ethernet...

Page 13: ...shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets 10BASE T 100BASE TX Ports The Switch has 24 or 48 auto negotiating 10BASE T 100BASE TX ports configured as Auto MDI MDI X These ports automatically provide the appropriate connection The default state for 10 100 Mbps ports is auto negotiation enabled where the speed duplex and flow control m...

Page 14: ...rity over the 10 100 1000 port of the same number 25 26 on the Switch 3226 49 50 on the Switch 3250 The corresponding 10 100 1000 port is disabled when an SFP module is present SFP Ports The two SFP Small Form Factor Pluggable ports support fiber Gigabit Ethernet short wave SX and long wave LX SFP Transceivers in any combination This offers you the flexibility of using SFP transceivers to provide ...

Page 15: ... is present and has a link The corresponding 10 100 1000 Mbps port is disabled Off No SFP Module has been inserted The corresponding 10 100 1000 port can be used Combo Port Status LEDs Green A 1000 Mbps link is present Yellow A 10 100 Mbps link is present Green Flashing There is 1000 Mbps activity on the port Yellow Flashing There is 10 100 Mbps activity on the port Yellow to Green flashing A link...

Page 16: ... use this socket to connect the Switch to a SuperStack 3 Advanced Redundant Power System See Connecting a Redundant Power System on page 24 Console Port Switch 3250 The console port allows you to connect a terminal and perform remote or local out of band management The console port uses a standard null modem cable and is set to auto baud 8 data bits no parity and 1 stop bit Power Socket Redundant ...

Page 17: ... ports are auto negotiated Flow Control Disabled in half duplex 10 100 ports Auto negotiated in full duplex 10 100 ports Disabled for 10 100 1000 ports Broadcast Storm Control Enabled Virtual LANs VLANs All ports belong to the untagged Default VLAN VLAN 1 with IEEE Std 802 1Q 1998 learning operational Link Aggregation Control Protocol LACP Disabled per port Multicast Filtering IGMP Filtering enabl...

Page 18: ...18 CHAPTER 1 INTRODUCING THE SUPERSTACK 3 SWITCH 3226 AND SWITCH 3250 DUA1750 0AAA01 book Page 18 Friday December 5 2003 10 24 AM ...

Page 19: ...fety information provided in Appendix A of this guide AVERTISSEMENT Consignes de sécurité Avant d installer ou d enlever tout composant du Switch ou d entamer une procédure de maintenance lisez les informations relatives à la sécurité qui se trouvent dans l Appendice A Appendix A de ce guide VORSICHT Sicherheitsinformationen Bevor Sie Komponenten aus dem Switch entfernen oder dem Switch hinzufuege...

Page 20: ...AUTION Ensure that the ventilation holes are not obstructed 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 lighting fixtures The Switch is accessible and cables can be connected easily Water or moisture cannot enter the case of the Switch Air flow is not...

Page 21: ...ate high levels of AC noise for example air conditioning units and laser printers 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 To rack mount your Switch 1 Place the Switch the right way up on a hard flat surface w...

Page 22: ...witch into the 19 inch rack and secure with suitable screws not provided Ensure that ventilation holes are not obstructed 6 Connect network cabling 7 Finally place a unit information label on the unit in an easily accessible position The unit information label shows the following The 3Com product name of the Switch The 3Com 3C number of the Switch The unique MAC address Ethernet address of the Swi...

Page 23: ...er outlet 3 The Power Self Test LED will flash green for approximately 60 seconds 4 When the unit is ready the Power Self Test LED lights green The Switch powers up and runs through its Power On Self Test POST which takes approximately 60 seconds Checking for Correct Operation of LEDs During the Power On Self Test all ports on the Switch are disabled When the POST has completed check the Power and...

Page 24: ... The Switch has no ON OFF switch the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord Choosing the Correct Cables All of the ports on the Switch are Auto MDIX that is they have a cross over capability The port can automatically detect whether it needs to operate in MDI or MDIX mode Therefore you can make a connection to a port with a straight ...

Page 25: ... The following section describes the use of SFP transceivers in your Switch SFP transceivers 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 To access the latest list of ...

Page 26: ...not recommended If the SFP transceiver is invalid it will not be recognized by the Switch Use the following sequence of steps to activate the SFP ports 1 Hold the transceiver so that the fiber connector is toward you and the product label is visible as shown in Figure 6 Ensure the wire release lever is closed in the upright position 2 Gently slide the transceiver into the SFP port until it clicks ...

Page 27: ...rrectly Refer to LEDs on page 14 for more information Removing an SFP Transceiver If you wish to remove a 3Com 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 ...

Page 28: ...28 CHAPTER 2 INSTALLING THE SWITCH DUA1750 0AAA01 book Page 28 Friday December 5 2003 10 24 AM ...

Page 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 Sett...

Page 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 network port and use the Web Interface or Command Line Interface See page 33 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 40 Web Interface Connect over the network via Telnet Se...

Page 31: ... 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 I...

Page 32: ...self with an appropriate IP address instead of you having to manually reconfigure the Switch If you use the automatic IP configuration method you need to discover the automatically allocated IP information before you can begin management Work through the Viewing Automatically Configured IP Information section on page 36 Preparing for Management Once your Switch s initial set up is complete you can...

Page 33: ...his whilst the Switch is offline that is before you connect the Switch to a network or whilst the Switch is online that is connected to a network Pre requisites A workstation with terminal emulation software installed such as Microsoft Hyperterminal This software allows you to communicate with the Switch via the console port directly Documentation supplied with the terminal emulation software A su...

Page 34: ...M port settings to which you have connected the cable The settings should be set to match the default 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...

Page 35: ...rompt enter manual The screen prompts you to enter IP information 4 Enter the IP address subnet mask and gateway 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 i...

Page 36: ...ion provided on the CD ROM that accompanies your Switch to discover the automatically allocated IP information 1 Connect your Switch to the network 2 Power up the Switch and wait for two minutes 3 Launch 3Com 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 Swit...

Page 37: ...Attach the female connector on the cable to the male connector on the console port of the Switch b Tighten the retaining screws on the cable to prevent it from being loosened c Connect the other end of the cable to one of the serial ports also known as a COM port on your workstation 2 Open your terminal emulation software and configure the COM port settings to which you have connected the cable Th...

Page 38: ...rrectly the top level menu of the command line interface is displayed as shown in the example in Figure 11 Figure 11 Example top level command line interface menu 4 At the Select menu option prompt enter the protocol ip interface summary command A summary of the automatically allocated IP information is displayed Make a note of the Network IP Address The initial set up of your Switch is now comple...

Page 39: ...nt 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 12 or remotely over the network see Figure 13 Figure 12 CLI management via the console port Figure 13 CLI management over the network Refer to Setting Up Command Line Interface Management on page 40 Web Interface Management Each Switch has ...

Page 40: ...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 port connection or over the network CLI Management via the Console Port To manage a Switch using the command line interface via the local console port connection 1 Ensure you have connected your worksta...

Page 41: ...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 where xxx xxx xxx xxx is the IP address of the Switch If opening a Telnet session via third party software you will need to enter the IP address in the format suitable for ...

Page 42: ...ed 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 Web Management Over the Network To manage a Switch using the web interface over an IP network 1 Check that you have the IP protocol correctly installed on your management workstation You can check this by trying to browse the World Wide Web If you can br...

Page 43: ...e 3Com Network Supervisor application that is provided on the CD ROM that accompanies your Switch to provide SNMP management for your Switch If you use 3Com Network Supervisor it automatically loads the correct MIBs and necessary files onto your workstation Pre requisites Documentation supplied with the SNMP network management application software To manage your Switch using an SNMP network manage...

Page 44: ...the default passwords using either The gettingStarted command on the CLI or The Security Device User Modify operation on the web interface For more information about default users and passwords refer to the Switch Management Interface Reference Guide on the Switch CD ROM User Name Default Password Access Level monitor monitor monitor the user can view all manageable parameters but cannot change an...

Page 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 DUA1750 0AAA01 book Page 45 Friday December 5 2003 10...

Page 46: ...omatically disabled You can verify this by checking that the Port Status LED is flashing Green Yellow This could be due to 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 The internal PSU has failed and power is bei...

Page 47: ...fixed end and not at the auto negotiation end Solving Hardware Problems In the rare event of your Switch unit experiencing a hardware failure refer to the list of suggested solutions below A fan failure warning message is received Your Switch has a fan monitoring system that will generate fan failure warning messages Fan failure could potentially reduce the lifetime of the Switch The monitoring sy...

Page 48: ...teway 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 such as 3Com Network Supervisor The following is a 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 must have a ...

Page 49: ...s the Internet you may use any arbitrary IP address as long as it is not being 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 upgrad...

Page 50: ...50 CHAPTER 4 PROBLEM SOLVING DUA1750 0AAA01 book Page 50 Friday December 5 2003 10 24 AM ...

Page 51: ...ents présentent des consignes que vous devez respecter pour garantir votre sécurité personnelle Vous devez respecter attentivement toutes les consignes Nous vous demandons de lire attentivement les consignes suivantes de sécurité avant d installer ou de retirer l appareil VORSICHT Warnhinweise enthalten Anweisungen die Sie zu Ihrer eigenen Sicherheit befolgen müssen Alle Anweisungen sind sorgfälti...

Page 52: ...t U S A and 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 p...

Page 53: ...le 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 telephones to these sockets Either shielded or unshielded data cables with shielded o...

Page 54: ...ui permet 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 ê...

Page 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...

Page 56: ...osenstecker 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 Europe Das Netzkabel muß vom Typ HO3VVF3GO 75 Mindestanforderung sein und die Aufschrift HAR ...

Page 57: ...n 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 Verfahren in anderer als der hierin genannten Weise kann zu gefährlichen Laseremiss...

Page 58: ...58 APPENDIX A SAFETY INFORMATION DUA1750 0AAA01 book Page 58 Friday December 5 2003 10 24 AM ...

Page 59: ...B PIN OUTS Null Modem Cable 9 pin to RS 232 25 pin PC AT Serial Cable 9 pin to 9 pin DUA1750 0AAA01 book Page 59 Friday December 5 2003 10 24 AM ...

Page 60: ...onal Data C 5 Not assigned Bidirectional Data C 6 Receive Data Bidirectional Data B 7 Not assigned Bidirectional Data D 8 Not assigned Bidirectional Data D Pin Number 10BASE T 100BASE TX 1000BASE T 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 Dat...

Page 61: ...e humidity 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 UL60950 EN60950 CSA 22 2 No 60950 IEC 60950 EMC Emissions CISPRR 22 Class A EN55022 Class A FCC Part 15 Subpart B Class A ICES 003 Class A AS NZS 3548 Class A EN61000 3 2 EN61000 3 3 Immunity EN 55024 Heat Dissipation ...

Page 62: ...RFC 1213 Bridge MIB RFC 1493 RMON MIB II RFC 2021 Remote Monitoring MIB RFC 1757 MAU MIB RFC 2239 Terminal Emulation Telnet RFC 854 Protocols Used for Administration UDP RFC 768 IP RFC 791 ICMP RFC 792 TCP RFC 793 ARP RFC 826 TFTP RFC 783 DHCP RFC 2131 RFC 2132 RFC 1534 DUA1750 0AAA01 book Page 62 Friday December 5 2003 10 24 AM ...

Page 63: ...ineers 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 3com com Contact your authorized 3Com reseller or 3Com for additional product and supp...

Page 64: ... 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 a current directory of support telephone numbers posted on the 3Com web site at http csoweb4 3com com contactus Telephone Technical Support and Repair To obtain telephone support as part ...

Page 65: ...1 888 9469 10800 61 00137 or 021 6350 1590 or 00800 0638 3266 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 East and Africa Telephone Technical Support and Repair From anywhere in these region...

Page 66: ...Salvador 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 speake...

Page 67: ...features 12 I installing the Switch 19 prerequisites 20 IP addressing registered 49 IP configuration 31 L LEDs 14 logging in as a default user 43 M MAC address of the Switch 22 management methods 39 preparing for 32 setting up 29 30 manual setup console port 33 MDI configuration 24 MDIX configuration 24 P passwords of default users 43 pin assignments null modem cable 59 RJ45 60 serial cable 59 pin...

Page 68: ... number 22 automatic setup 36 console port 15 16 dimensions 61 Ethernet address 22 features 12 installation 19 20 MAC address 22 power socket 16 powering up 23 product name 22 rack mounting 21 serial number 22 size 61 unit information label 22 weight 61 system specifications 61 T troubleshooting 45 U unit information label 22 W Web browsers choosing 42 web interface choosing a browser 42 web inter...

Page 69: ...nd 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 ...

Page 70: ...DUA1750 0AAA01 book Page 70 Friday December 5 2003 10 24 AM ...

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