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Troubleshooting a Power Supply

35

Troubleshooting a 
Power Supply

If a power supply failure occurs under any condition, a message or 

trap

 is sent to 

the SNMP management application. If you see this trap, or experience any other 
problems with the power supplies, please refer to the following sections and 
contact technical support personnel.

Diagnosing Switch

Indicators

If the AC LED on the power supply (see Figure 12 on page 33) does not light up 
when the power cord is plugged in, you may have a defective power outlet, power 
cord, or power supply. Check the power outlet by plugging in another device that 
is functioning properly. Check the power cord with another device. 

If the AC LED lights up but the DC LED does not light up when the power cord is 
plugged in, you have a defective power supply. 

If you need further assistance, contact your technical support provider or 3Com 
for assistance.

Intermittent Operation

If the chassis powers off after running for a period of time, check for loose power 
connections, power losses or surges at the power outlet, and verify that the fans 
on the back of the chassis are unobstructed and operating prior to shutdown. If 
you still cannot isolate the problem, then the power supply may be defective. In 
this case, contact your technical support provider or 3Com for assistance.

Power Supply Failure

There are no user-serviceable parts on a power supply. Do not disassemble a 
power supply and attempt to fix it. If a power supply fails, simply remove it as 
described in this chapter and return the components to your supplier or 3Com. 
Consult your purchase records so that you can determine if the incident occurred 
during the warranty period. 

Содержание 4005

Страница 1: ...http www 3com com 3Com Switch 4005 Installation and Maintenance Guide Part No 150568 102 R02 Published November 2001 ...

Страница 2: ...please contact 3Com and a copy will be provided to you UNITED STATES GOVERNMENT LEGEND If you are a United States government agency then this documentation and the software described herein are provided to you subject to the following All technical data and computer software are commercial in nature and developed solely at private expense Software is delivered as Commercial Computer Software as de...

Страница 3: ...Module Slots in the Chassis 12 Building a System 13 Servicing a System 13 Switch Backplane Architecture 14 3 SITE REQUIREMENTS AND PRODUCT SPECIFICATIONS Physical Specifications 15 Environmental Specifications 16 Ventilation Requirements 16 Location Requirements 16 Precautionary Guidelines 17 Power Requirements 18 Power Cords 18 Safety Information 18 Laser Warning 19 FDA Class 1 Laser Device 19 LE...

Страница 4: ...ating Requirements 30 Power Supply Slot Covers 30 AC and DC LEDs 31 No ON OFF Switch 31 Power Cords 31 Autosensing Capability 31 How Two Supplies Operate 31 Maintenance 31 If Failure Occurs 31 Hot Swap 31 Installing a Power Supply 32 Removing a Power Supply 34 Troubleshooting a Power Supply 35 Diagnosing Switch Indicators 35 Intermittent Operation 35 Power Supply Failure 35 6 SWITCH 4005 FAN TRAYS...

Страница 5: ...00BASE FX Fast Ethernet Module 50 Gigabit Ethernet Interface Modules 53 1000BASE SX Gigabit Ethernet Modules 53 1000BASE T Gigabit Ethernet Modules 53 GBIC Gigabit Ethernet Modules 54 Installing a Module 57 Safety Precautions 57 ESD Safety Information 58 Handling Precautions 58 Installation Prerequisites 58 Slot Restrictions 58 Installation and Removal Consequences 59 Module Installation Procedure...

Страница 6: ...PPORT Online Technical Services 67 World Wide Web Site 67 3Com Knowledgebase Web Services 67 3Com FTP Site 67 Support from Your Network Supplier 68 Support from 3Com 68 Returning Products for Repair 69 GLOSSARY INDEX ...

Страница 7: ... area network LAN operations but it does not assume prior knowledge of Switch 4005 high performance networking equipment Furthermore this guide assumes that the network administrator has obtained the appropriate technical training and experience to perform tasks in service access areas of network equipment to be aware of electrical hazards or other hazards that exist in performing these tasks and ...

Страница 8: ...y Information Guide Switch 4005 Software Configuration Guide Switch 4005 Release Notes To read a brief description of each document to understand how each document is distributed or to learn how to order additional paper copies or download electronic copies see the Switch 4005 Key Information Guide which is included in the shipping box of every item in the Switch 4005 product set ...

Страница 9: ...nstalling a preconfigured starter kit and do not require additional interface modules you can skip this step If you need to install additional modules see Chapter 7 for the information about their physical attributes and module installation procedure All chassis ship from the manufacturing center with a Switch Fabric Management Module SFMM preinstalled thus you do not have to install one However y...

Страница 10: ... DC LEDs on each installed power supply are lighted The Power LED on the SFMM module is Green The Diagnostic LED on all modules is Green The Port Link and Mode LEDs on all interface modules remain off until you attach cabling and functioning network links are created If a Module Diagnostic LED is off after the diagnostics run that module has failed If you observe error conditions with the followin...

Страница 11: ...00 Watt AC power supplies Only one power supply is required for normal operation If installed a second power supply provides load sharing and redundancy Two Switch Fabric Management Modules SFMMs Only one SFMM is required for normal operation If the SFMM is removed from a powered up chassis that is functioning in a network chassis operations will cease However if a backup SFMM is installed in the ...

Страница 12: ...cond power supply bay if a second power supply is not installed Module Slots in the Chassis You insert modules vertically into the chassis slots so that the slot number shows through a hole in the module faceplate As shown in Figure 1 the slots for interface modules are numbered from left to right starting with number 1 and continuing to 12 The two center slots are numbered M1 and M2 because they ...

Страница 13: ...upply one SFMM and a variety of preinstalled Fast Ethernet or Gigabit Ethernet Interface Modules to which you can add additional interface modules of your choice Starter kits are designed to reduce installation time For details on the available starter kit configurations see your 3Com network supplier Servicing a System For service spares purposes all component items such as fan trays power suppli...

Страница 14: ...o all the services from the Switch 4005 backplane a data channel for network traffic between the SFMM and interface modules a control channel that passes signals for module detection module diagnostics LED operation between the SFMM and interface modules a Serial Communication Interface SCI communications channel that operates between two SFMMs if installed to keep their configurations synchronize...

Страница 15: ...itch 4005 chassis are shown in Table 1 Table 1 Chassis Physical Specifications Height 22 23 cm 8 75 inches 5 Rack Units Width 48 3 cm 43 94 cm 19 inches including rack mount flanges 17 3 inches not including rack mount flanges Depth 43 68 cm 17 2 inches Weight 12 42 kg 20 62 kg 27 38 pounds chassis backplane power supply fans 45 46 pounds fully loaded Mounting Tabletop shelf or standard 19 inch ra...

Страница 16: ...our fans running If one fan in a fan tray fails replace the fan tray as soon as possible Location Requirements Install the Switch 4005 in an area that meets the following location requirements The surface on which you want to place the Switch 4005 chassis is level The power source is within approximately 2 meters 6 6 feet of the location where you plan to install the Switch 4005 Each of the power ...

Страница 17: ... is three times the weight of a fully loaded Switch 4005 chassis To reduce the possibility of personal injury or serious damage to the chassis use at least two people to install the chassis This is especially important for rack installations because you must hold the chassis in place while you secure it to the rack If you are installing the Switch 4005 in a rack first ensure that the rack is insta...

Страница 18: ...ea network LAN operations Furthermore this guide assumes that the network administrator has obtained appropriate technical training and experience to perform tasks in service access areas of network equipment to be aware of electrical hazards that exist in performing these tasks and to take steps that minimize the danger to themselves or other persons If you have questions on installation tasks co...

Страница 19: ...o Class 1 Laser Devices FDA Class 1 Laser Device This product complies with U S Department of Health and Human Services Rules 21 CFR Subchapter J applicable at date of manufacture LED Warning The following warning is required when you install fiber optic communication modules into the Switch 4005 WARNING To ensure optical safety when you install a fiber optic interface module comply with the follo...

Страница 20: ...pliance on the Declaration of Conformity This equipment was tested and found to conform to the Council Directive 72 23 EEC for safety of electrical equipment Conformity with this directive is based upon compliance with the safety standard EMC Directive Emissions EMC EN55022 EN61000 3 2 Immunity EN50082 1 EMC Directive Compliance This equipment was tested and found to conform to the Council Directi...

Страница 21: ...nstallation only Attach the cable management device which is included in the chassis shipping box to the rack WARNING The Switch 4005 chassis and its components must be installed maintained or replaced only by trained service personnel This guide assumes that the network administrator has a working knowledge of local area network LAN operations Furthermore this guide assumes that the network admin...

Страница 22: ... Mount Flange Pin and Rack Slots WARNING When the Switch 4005 chassis is fully loaded with modules fans and power supplies the chassis weighs approximately 20 6 kg 45 5 lb To reduce the weight that you have to lift or support you may consider installing your chassis before you install additional modules or power supplies WARNING Safety regulations state that the selected table rack or shelf must b...

Страница 23: ... on page 17 Review the section Safety Information on page 18 Review the section Safety Precautions on page 22 Before you attempt to mount the chassis in a rack select a rack that can support at least 61 8 kg 136 5 lb which is three times the weight of a fully loaded chassis If you install more than one chassis in a rack install the bottom chassis first Chassis PreInstallation Guidelines Before you...

Страница 24: ...stallation Using at least two people follow these steps to mount the chassis in a rack Some steps in the next procedure mention clip nuts All racks do not require the use of clip nuts Consult your rack documentation Note Clip nuts are not provided in the Switch 4005 hardware kit 1 Read the previous section in this chapter titled Preinstallation Guidelines as well as the all sections that discuss s...

Страница 25: ...icable a Install one screw in the bottom part of each flange b Install one screw in the top part of each flange WARNING Continue to support the chassis until you have securely installed all four screws two screws per flange If you release the weight of the chassis on fewer than four fully inserted screws the chassis may drop off the rack Personal injury or serious damage to the chassis may result ...

Страница 26: ... feet from the hardware kit 4 Position the chassis on its side so that you can access the bottom of the chassis 5 Remove the protective covering from the adhesive on the rubber feet and attach one foot at each corner within the scribed squares See Figure 7 Figure 7 Attaching Rubber Feet to the Switch 4005 Chassis 6 Position the chassis so that it rests upright and level on its rubber feet 7 Ensure...

Страница 27: ...s all sections titled Safety Information 2 Place the cable management device flush up against the top or bottom of the chassis as shown in Figure 8 Figure 8 Position of the Cable Management Device 3 Using a Phillips screwdriver secure the cable management device to the rack with two screws and with clip nuts if you are using these a If you use clip nuts consider attaching nylon flat washers to the...

Страница 28: ...28 CHAPTER 4 SWITCH 4005 CHASSIS ...

Страница 29: ...eatures The Switch 4005 can contain two 300 Watt modular AC power supplies Model Number 3C16822 but only one is required for normal operation of a fully loaded chassis The power supplies provide power to the management modules interface modules fans and backplane Power supplies are installed from the rear of the Switch 4005 chassis as shown in Figure 9 Figure 9 Switch 4005 with Minimum Rear Config...

Страница 30: ... help to maintain high availability of your network 3Com recommends that you install a second power supply in the chassis and connect it to a dedicated power source All Switch 4005 chassis have one power supply preinstalled at the manufacturing center If you want to configure your chassis for high availability order a second power supply and install it at your site Save the blank faceplate that yo...

Страница 31: ...wer supplies are installed they operate in a load sharing manner This means that each power supply provides an equal amount of the load current This is done so that if one power supply fails the other power supply can immediately provide all required power and network activity is not disrupted Maintenance Ensure that the immediate area around the Switch 4005 is free from dust or small debris and t...

Страница 32: ...ower cord serves as the mains disconnect Do not attach a power cord to a mains outlet until the power supply is fully installed in the chassis WARNING To ensure compliance with international safety standards only use the power cord that is supplied with the unit AVERTISSEMENT Pour garantir le respect des normes internationales de sécurité utilisez uniquement l adaptateur électrique remis avec cet ...

Страница 33: ...a slight resistance as the connectors engage CAUTION If the resistance is too great the power supply connectors and the backplane connectors may not be aligned properly Do not force the power supply into the slot or you can damage the connectors If necessary remove and reinsert the power supply ensuring that the connectors are aligned 6 To secure the power supply to the chassis tighten the two ret...

Страница 34: ...ING Before you attempt to remove a power supply from the chassis be sure to disconnect the power cord from the electrical outlet and then from the Switch 4005 power supply to avoid hazardous energy levels Before you begin have ready a flathead screwdriver To remove a power supply follow these steps 1 Remove the power cord from the electrical outlet 2 Remove the power cord from the AC input socket ...

Страница 35: ... power cord is plugged in you have a defective power supply If you need further assistance contact your technical support provider or 3Com for assistance Intermittent Operation If the chassis powers off after running for a period of time check for loose power connections power losses or surges at the power outlet and verify that the fans on the back of the chassis are unobstructed and operating pr...

Страница 36: ...36 CHAPTER 5 SWITCH 4005 POWER SUPPLIES ...

Страница 37: ...05 is operating To cool the chassis the fan trays pull in cooler ambient air from vents in the module faceplates and then expel the hot air through vents in the rear of the fan trays The power supplies also contain small fans Their fans pull air from side vents in the chassis and expel hot air through vents in the rear of the power supplies Fan tray failure or ambient air that is too hot will even...

Страница 38: ...ironment for the Switch remains within the specifications in Chapter 3 In addition ensure that the immediate area around the Switch 4005 is free from dust or small debris and that the module and fan vents are unobstructed There are no user serviceable parts on a fan tray If Failure Occurs If one or both of the fans in a fan tray fails or operates intermittently remove and reinsert the fan tray as ...

Страница 39: ...r 3Com technical support See Appendix A for contact information Before you begin have ready a flathead screwdriver 1 Face the back of the chassis and using a flathead screwdriver loosen the two retaining screws that attach the fan tray to the chassis Figure 15 2 Grasp the fan tray around the edges with both hands and begin to pull the fan tray towards you CAUTION If the chassis is powered on one o...

Страница 40: ... to take steps that minimize the danger to themselves or other persons If you have questions on installation tasks contact your network supplier or 3Com technical support See Appendix A for contact information Before you begin have ready a flathead screwdriver 1 Facing the back of the chassis grasp the front panel of the fan tray around the edges 2 Slide the fan tray into the chassis using the gui...

Страница 41: ...crews with a flathead screwdriver Tighten the screws to a Torque Specification of 1 5 kg cm 1 3 in lb NOTE The fans begin rotating when you power on the chassis or when the connector on a newly inserted fan tray makes contact with the backplane connector in a powered on chassis 6 Visually inspect all installed fans to verify that each is turning continuously when the chassis is powered up If one o...

Страница 42: ...s described in this chapter From this you can determine if the problem was simply due to a loose connection or fan tray that was not secured to the chassis If problems continue remove and replace the fan tray with a new one There are no user serviceable parts in a fan tray Do not attempt to fix a faulty fan tray Return the faulty fan tray to your supplier or to 3Com Consult your purchase records s...

Страница 43: ...or remove them The major sections of this chapter are as follows Switch Fabric Management Module Overview Interface Module Overview Fast Ethernet Interface Modules Gigabit Ethernet Interface Modules Installing a Module Removing a Module GBIC Transceivers Attaching and Removing GBIC Transceivers Troubleshooting Modules For information about the software features and the default software configurati...

Страница 44: ...ll it For information about the default settings on the software features or how to modify them see the Switch 4005 Software Configuration Guide Management Functions The Switch Fabric Management Module exchanges information with all modules through the management bus The module uses the management bus to send commands to interface modules and to collect information from interface modules The Switc...

Страница 45: ...n this chapter Retaining screws You use these screws to secure the module in the chassis after you have closed the ejector handles Do not use these screws to seat the module or you may damage the connectors on the rear of the module or inside the chassis Release button and LED You use this button and its LED as part of the module removal procedure See Removing a Module later in this chapter Slot w...

Страница 46: ...tics Flashing green Green Self diagnostic process or software download is occurring System has passed diagnostics or completed software download Power Off Green Module is not receiving power Module is receiving power Primary Off Blue Module is in Standby mode Module is in Primary mode and is functioning as the central backplane aggregator and management entity for the Switch 4005 Release Flashing ...

Страница 47: ... mechanism reboots the system there is no loss of configuration data Table 7 Console Port Pinouts Pin Signal Name 1 Not Used 2 Receive Data RD 3 Transmit Data TD 4 Not Used 5 Signal Ground GND 6 Not Used 7 Request to Send RTS 8 Clear to Send CTS 9 reserved Table 8 RS 232 9 Pin to 9 Pin Cable Connection Pin Assignments Signal SFMM Pin DTE Pin Signal CD 1 N A Not Used RX 2 3 TX TX 3 2 RX DTR 4 6 Not...

Страница 48: ...ason the secondary SFMM immediately takes over all primary functions The Failover Process If you remove deinstall the primary SFMM or if the module fails in some way the following process occurs automatically 1 The system initiates the fail over mechanism after for example the primary module fails or is removed 2 The system reboots and the secondary SFMM becomes the primary SFMM Because it learned...

Страница 49: ...ary Switch Fabric Management Module which switches or routes the packet to the proper module or floods it Hot Swap All Fast Ethernet and Gigabit Ethernet Interface Modules support hot swapping which means that you can remove modules and install modules while the chassis is powered up and operating Hot swapping does not interfere with the general operation of the Switch However see the caveats and ...

Страница 50: ...plex connection Module and Port LEDs See Table 11 on page 52 for definitions Front faceplate See Figure 19 on page 51 for details Cabling requirements 62 5 125 micron Multimode fiber MT RJ male patch cables are required The MT RJ connector conforms to ISO IEC 11801 and ANSI EIA TIA Draft Detail Specification for optical connectors Maximum Segment Length is 2 km 1 243 miles Pin MDI Signal Name MDI ...

Страница 51: ...ibes the purpose of the LEDs on each module Figure 19 Front Faceplates of Switch 4005 Fast Ethernet Interface Modules Port Link LED Ejector handle RJ 45 ports Release button Port Mode LED Ejector handle Port Link LED MT RJ ports Model number Diagnostic LED Retaining screw Slot number window Port Mode LED Release LED ...

Страница 52: ...ing Amber Port is set to disabled Off Cable is not connected or link is down Mode If this LED is Amber and FC LED on SFMM is Green Flow control is enabled on the port If this LED is Off and FC LED on SFMM is Green Flow control is disabled on the port If this LED is Amber and FDX LED on SFMM is Green Port is operating at full duplex If this LED is Off and FDX LED on SFMM is Green Port is operating ...

Страница 53: ...r 3 switching Physical features Release button and LED are used to remove the module 1000BASE T RJ 45 ports provide auto negotiation for connection speed 10 100 1000 duplex mode and flow control Module and Port LEDs See Table 13 on page 56 for definitions Front faceplate See Figure 20 on page 55 for details Cabling requirements Category 5 UTP or STP works for 1000BASE T as long as all four pairs a...

Страница 54: ...cept a 1000BASE LX single mode fiber transceiver or 70 km long haul single mode fiber transceiver The GBIC module should only be used with the transceivers approved by 3Com See the GBIC Transceivers section later in this chapter Module and Port LEDs See Table 13 on page 56 for definitions Front faceplate See Figure 20 on page 55 for details Use either of the following transceivers Cabling requirem...

Страница 55: ...able Gigabit Ethernet Interface Modules Figure 20 Front Faceplates of Gigabit Ethernet Interface Modules 4 4 4 GBIC transceiver slot Model number Diagnostic LED Port Link LED Port Mode LED Slot number window RJ 45 port SC type port Ejector handle Release button Ejector handle Retaining screw Release LED MT RJ port ...

Страница 56: ...bled Off Cable is not connected or link is down Mode2 If this LED is Amber and FC LED on SFMM is Green Flow control is enabled If this LED is Off and FC LED on SFMM is Green Flow control is disabled If this LED is Amber and FDX LED on SFMM is Green Port is operating at full duplex If this LED is Off and FDX LED on SFMM is Green Port is operating at half duplex3 If this LED is Amber and Act LED on ...

Страница 57: ...or a finger with jewelry into open module slots Do not touch any connections within the chassis with your hands or fingers WARNING To maintain proper cooling in the chassis and to maintain safety compliance make certain that a blank faceplate covers any empty module slot WARNING RJ 45 Ports These are shielded RJ 45 data sockets They cannot be used as standard traditional telephone sockets or to co...

Страница 58: ... slowly and carefully slide the module into the chassis Keep the module in its antistatic bag until you are ready to install it Installation Prerequisites Before you install a module make the following preparations Verify that the chassis is properly installed in a rack on a table or on a shelf according to the instructions in Chapter 4 Have a flat blade torque screwdriver available to secure the ...

Страница 59: ...on to this module You will have to manually configure the parameters for the new module s ports However if you immediately re installed the original module in that slot or in a different slot the chassis would remember the module and retain its configuration parameters If a module fails and you need to replace it with another one of the same type you must configure the new module manually At this ...

Страница 60: ...ple modules 3Com recommends that you remove only one faceplate at a time so that there are either modules or blank faceplates adjacent to the slot that you have selected Having these items on either side helps you to install a module correctly WARNING To ensure adequate cooling air flow and continued product safety agency compliance install blank faceplates over all empty slots 4 Remove the module...

Страница 61: ...cess begins CAUTION If there is too much resistance when you try to close the ejector handles the module and backplane connectors may not be aligned Forcing the module into place can damage both connectors If necessary remove and reinsert the module ensuring that the connectors are properly aligned Do not tighten the spring loaded screws to seat the module 8 To secure the module in the chassis tig...

Страница 62: ...ore it halts operation Wait until this LED stops flashing before you remove the module 2 Loosen the spring loaded screws at each end of the front panel using a flathead screwdriver 3 Grasp the top ejector handle with the thumb and forefinger of one hand and the bottom ejector handle with the other hand Simultaneously pull the ejector handles until each handle is perpendicular to the front panel Yo...

Страница 63: ...m other vendors that comply with these standards should function properly when attached to the module However 3Com has only tested the 1000BASE LX GBIC Transceiver Model Number 3CGBIC92 and the 70 km Long Haul GBIC Transceiver Model Number 3CGBIC97 1000BASE LX GBIC Transceiver The 1000BASE LX GBIC transceiver Model Number 3CGBIC92 supports a direct connection to single mode fiber optic cable or co...

Страница 64: ...the GBIC port on the module To remove a GBIC transceiver use one hand to compress the side tabs on the transceiver and gently pull it out of the port To attach a GBIC transceiver follow these steps 1 Orient the transceiver so that the SC connector is facing toward you Figure 23 Figure 23 Inserting the GBIC Transceiver 2 Gently slide the transceiver into the GBIC port until the side tabs click into...

Страница 65: ...ing correctly Verify that all connectors on modules and all attached devices are correctly engaged with the proper cabling If you are using a fiber optic cable clean the terminators by wiping them gently with a clean tissue or cotton bud that is moistened with a little ethanol Dirty fiber terminators impair the quality of the light that is transmitted through the cable If a port is not operating m...

Страница 66: ...erence If the Diagnostic LED still does not light the software on the SFMM may be corrupted If you can reach the CLI try downloading a new copy of the software from a TFTP server to the Switch For a procedure see the applicable version of the Switch 4005 Release Notes If you cannot bring up a console connection verify the port pinouts See Table 7 on page 47 ...

Страница 67: ...t information such as technical documentation and software as well as support options that range from technical education to maintenance and professional services 3Com Knowledgebase Web Services This interactive tool contains technical product information compiled by 3Com expert technical engineers around the globe Located on the World Wide Web at http knowledgebase 3com com this service gives all...

Страница 68: ...ephone support phone number at the location nearest you When you contact 3Com for assistance have the following information ready Product model name part number and serial number A list of system hardware and software including revision levels Diagnostic error messages Details about recent configuration changes if applicable Here is a list of worldwide technical telephone support numbers These num...

Страница 69: ...0800 995014 900 983125 020 795482 0800 55 3072 0800 966197 Latin America Brazil Mexico 0800 13 3266 01 800 849CARE Puerto Rico Central and South America 800 666 5065 AT T 800 998 2112 North America 1 800 NET 3Com 1 800 638 3266 Enterprise Customers 1 800 876 3266 Country Telephone Number Country Telephone Number Country Telephone Number Fax Number Asia Pacific Rim 65 543 6500 65 543 6348 Europe So...

Страница 70: ...800 1821502 00800 12813 1800553117 1800 9453794 1678 79489 0800 0227788 Norway Poland Portugal South Africa Spain Sweden Switzerland U K 800 11376 00800 3111206 0800 831416 0800 995014 900 983125 020 795482 0800 55 3072 0800 966197 U S A and Canada 1 800 NET 3Com 1 800 638 3266 Enterprise Customers 1 800 876 3266 1 408 326 7120 not toll free Country Telephone Number Fax Number ...

Страница 71: ...t 1000 Mbps bridge Equipment that connects different LANs allowing communication between devices that reside on separate LAN segments or collision domains Bridges are protocol independent but hardware specific with communication limited to the data link layer Layer 1 and physical layer Layer 2 of the OSI reference model bus topology A network architecture that has all of its nodes connected to a s...

Страница 72: ...e an extra link in a network that is inactive until the primary link fails or reaches capacity Gigabit Ethernet A 1000 Mbps local area data network technology that was developed a few years after Fast Ethernet It is compatible with existing 10 100 Ethernet standards The IEEE with the help of the Gigabit Ethernet Alliance defines the standard for full duplex over fiber optic cable and short haul co...

Страница 73: ...twork to the device MIB Management Information Base A database of network management information that describes specific aspects of individual network components MMF Multimode fiber An optical fiber with a core diameter of from 50 to 100 microns It is the most commonly used optical fiber for short distances Light can enter the core at different angles making it easier to connect the light source H...

Страница 74: ... 3 switch RS 232 serial port A port that changes the parallel arrangement of data within computers to the serial one after the other form used on data transmission links This type of port can be used for local management access of a network device SC connector A fiber optic cable connector that uses a push pull latching mechanism similar to common audio and video cables For bi directional transmis...

Страница 75: ... against interference Each wire is insulated and the pair is usually covered by an overall casing This type of wiring is often used in Ethernet network infrastructures sometimes called cable plants UTP Unshielded Twisted Pair Common phone grade twisted pair wiring that is not provided with a protective shielding against outside interference Contrasts with STP or shielded twisted pair WAN Wide Area...

Страница 76: ...76 GLOSSARY ...

Страница 77: ...rnet 53 L laser and LED warnings 19 LEDs Fast Ethernet Interface Modules 52 Gigabit Ethernet Interface Modules 56 Switch Fabric Mgmt Module 46 M MIBs 67 Minimum requirements for normal operation 12 modules 11 troubleshooting 65 O online technical services 67 P pinouts 10BASE T MDI port 50 53 console cable 47 console port 47 power cords 31 requirements 18 Power supplies 9 power supply installing an...

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