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Upgrades

5-13

Figure 5-7

Disconnecting Power Supply Cables

Remove the power supply.

Remove the screw that fastens the power supply module to the bottom
of the chassis.

Figure 5-7 shows the location of the screw.

Slide the power supply module toward the front of the server and lift it
partially out.

The bottom of the power supply has two keyhole slots that fit over
standoffs located on the bottom of the chassis. You must slide the power
supply far enough forward to lift it off the standoffs.

Disconnect the cable that connects the power supply to the connector
on the motherboard, as shown in Figure 5-7.

Back panel

Power supply

Front panel Auxiliary processor board connector

Power wiring
harness
connector

Diskette drive

Motherboard
connector

16-port asynchronous modules

Screw

CS3000BookFile Page 13 Tuesday, October 15, 1996 5:12 PM

Содержание CS/3000-48

Страница 1: ...CS 3000 SERIES COMMUNICATIONS SERVER INSTALLATION GUIDE Part No 09 0389 001 Published March 1996 CS3000BookFile Page i Tuesday October 15 1996 5 12 PM...

Страница 2: ...e United States and may or may not be registered in other countries 3Com is a registered trademark of 3Com Corporation 3ComFacts and Ask3Com are service marks of 3Com Corporation CompuServe is a regis...

Страница 3: ...otice This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the interference causing equipment standard entitled Digital Apparatus ICES...

Страница 4: ...Communications Server Reference Guide If the information in the release notes shipped with your product differs from the information in this guide follow the release notes Audience This guide is inten...

Страница 5: ...0 IP NETaddr 0 0 0 0 This guide uses upper and lowercase letters to distinguish the full form of commands and command syntax from the abbreviated form You can enter a command in abbreviated form by ty...

Страница 6: ...ports in 16 port increments to a maximum of 48 serial ports Refer to Configurations for information on configurations available at purchase Support for parallel printers with Centronics interfaces Opt...

Страница 7: ...nal diskette drive Configurations CS 3000 series servers can be purchased in the following configurations Three 16 port asynchronous modules 48 ports No 16 port asynchronous modules The no module conf...

Страница 8: ...les and a single port AUI module installed but not cabled Figure 1 1 Front and Rear Views of Model CS 3100 The following sections describe the basic and optional components of the CS 3000 series serve...

Страница 9: ...errupt switch Figure 1 2 shows the location of these components in a Model CS 3100 with its cover removed Model CS 3000 is identical except that it does not have a diskette drive Figure 1 2 Model CS 3...

Страница 10: ...rmation used by the Ethernet controller This arrangement provides better performance than single memory based servers Parallel printer connector Provides the connection between the server and a parall...

Страница 11: ...ion on memory dumps refer to Memory Dump Procedures WARNING Use only a nonconductive object such as a plastic stylus to press the hardware interrupt switch Do not use the tip of a pencil Graphite part...

Страница 12: ...Indicators LED Name Normal State Function Power On On when server is on and the power supply generates voltage on its 5 V DC output Self Test Off On for approximately two minutes following power on or...

Страница 13: ...ollowing components Four slots Three for 16 port asynchronous modules One for an Ethernet interface module Console port Auxiliary port Parallel printer port Power supply module Figure 1 4 Back Panel o...

Страница 14: ...n on attaching a console refer to Attaching a Console The auxiliary port is reserved for internal 3Com use and is not operational The console and auxiliary ports are horizontally mounted male DB 9 RS...

Страница 15: ...RS 232 RS 423 signals Each serial connector contains 8 ports for a total of 16 ports per module or 48 ports for a com munications server with the full complement of three modules The ports are configu...

Страница 16: ...echanisms Figure 1 6 Strain Relief Mechanisms For information on installing the cable strain relief refer to Chapter 2 Installation Optional Ethernet Interface Modules The following optional Ethernet...

Страница 17: ...I Module Figure 1 7 also shows a connector mounted directly on the board This connector mates with a connector on the motherboard For information on installing and cabling the single port AUI module r...

Страница 18: ...ch is off ACTIVITY LINK POLARITY 10BaseT Board LEDs RJ45 port Connector Table 1 4 Single Port RJ 45 Module LEDs and Their Functions LED Name Normal State Function Activity On continuously or flashing...

Страница 19: ...rongs with chassis ground on the middle prong All servers are shipped with power cords If your power cord does not match your requirements contact your network supplier Optional Rack Mount Kit An opti...

Страница 20: ...ithout user switching Maximum current consumption 1 7 A at 115 V AC 0 83 A at 230 V AC Fuse 3 A 250 V fast blow 5 mm x 20 mm Output power 86 W Maximum power dissipation 105 W continued Maximum power c...

Страница 21: ...he 16 port asynchronous and Ethernet interface modules in their antistatic shielded bags until you are ready to install them Refer to step 7 for additional ESD guidelines Table 2 1 Installation Steps...

Страница 22: ...bel 6 Collect the tools you need You need a 1 and a 2 Phillips screwdriver and a small slotted screwdriver 7 Observe the following ESD guidelines when installing 16 port asynchronous modules and Ether...

Страница 23: ...steps WARNING Before removing the cover be sure the unit is turned off and the power cable is either unplugged from the unit or from the wall socket 1 Remove the cover a Using the 1 Phillips screwdriv...

Страница 24: ...s void if this occurs Loosen the two screws that secure the blanking plate and remove the plate 4 Fasten each 16 port asynchronous module to the upper portion of the back panel as shown in Figure 2 2...

Страница 25: ...e 16 port asynchronous modules to a host terminal modem or other serial equipment refer to Cabling 16 Port Asynchronous Modules Installing Ethernet Interface Modules This section describes the procedu...

Страница 26: ...a tabletop in a two or four pole 19 inch rack or vertically in a wall mount It is usually easier to mount the server before attaching cables Mounting on a Tabletop To mount your server on a tabletop...

Страница 27: ...e the two outer screws from the sides of the server with the 1 Phillips screwdriver Using the 4 40 screws provided fasten a bracket to each side of the server as shown in Figure 2 4 Tighten each screw...

Страница 28: ...in the vertical stand with the rear panel pointing to one side Be sure that the side with the exhaust openings points up When you view the front panel in this position the reset switch is closest to t...

Страница 29: ...verview Figure 2 6 Typical Cabling Applications 3Com supplies 3Com or customer supplies Customer supplies Extension cables Octopus hydra cables Patch panels 6 wire modular cables D type adapters CS 30...

Страница 30: ...DCE device such as a modem use a null modem cable For more information on 16 port asynchronous modules refer to 16 Port Asynchronous Modules You can connect an extension or octopus cable to the serial...

Страница 31: ...ble also known as a hydra cable that fans out the 50 pin Telco connector to eight RJ 12 connectors The other end of this cable terminates in a 50 pin bottom entry male connector Figure 2 8 shows the o...

Страница 32: ...rts through RJ 12 jacks The panel has three groups of eight ports as shown in Figure 2 9 and Figure 2 10 Each group of eight ports is called a harmonica box Three harmonica boxes compose one patch pan...

Страница 33: ...t number 3C6106 3Com also recommends the following vendors and part numbers 24 channel patch panel MOD TAP part number 27 6E 249 B002G 48 channel patch panel MOD TAP part number 27 6E 489 B002G Cablin...

Страница 34: ...to use to connect your hosts terminals modems or other serial equipment to each serial connector for example an extension cable octopus cable and D type adapter or an extension cable patch panel 6 wir...

Страница 35: ...s installation you need either an external transceiver a fanout box repeater or a hub and an AUI cable no longer than 150 ft 46 m You must provide your own transceiver fanout box or hub You can buy th...

Страница 36: ...536888 or equivalent and have connectors with metallic backshells Cable shields should be connected to backshells 3 Slide the latch on the AUI port into the closed position as shown 30 ft 9 m Standard...

Страница 37: ...VDE 0871 or CISPR22 EN55022 for Class A devices the twisted pair cable should be shielded and have connectors with metallic backshells Cable shields should be connected to backshells 3Com recommends t...

Страница 38: ...backshells Cable shields should be connected to backshells Attaching a Console You may need to attach a console to perform the following tasks Modify firmware parameters as described in Appendix C Mo...

Страница 39: ...To attach a console follow these steps 1 Attach one end of the cable to the console port on the back panel of the communications server and the other end to the modem port on the back of a terminal s...

Страница 40: ...r source The AC power source must meet the requirements outlined in Specifications The server must be connected to its AC power source with a grounded line cord to meet safety requirements Modifying t...

Страница 41: ...r For more information refer to Chapter 4 Configuration If you plan to use a console to access the server monitor make sure the console is configured correctly Refer to Attaching a Console Booting fro...

Страница 42: ...sceiver connect a transceiver cable between the server and transceiver Make sure the transceiver is connected to the network 3 Configure the RBCS server to support boot of the communications server 4...

Страница 43: ...opy the distribution diskette store it in a safe place and use only the copy as the working diskette If you are upgrading from earlier software you may be able to copy configuration information from y...

Страница 44: ...cause the boot source is not present it displays the following message Do you want to enter monitor Y N 5 Type Y at the prompt The following message appears 3Com Corporation CS 3000 Series Monitor You...

Страница 45: ...turn to continue 11 Remove the master diskette 12 Insert the formatted copy destination diskette the diskette you are copying to into the diskette drive and press the Return key A message similar to t...

Страница 46: ...ections and copied the software distribution diskette you are ready to boot your communications server 1 Insert the working diskette in the drive label side up 2 If the server is off turn it on by pre...

Страница 47: ...or card installed 128K ram installed Diagnostic Upload Completed Auxiliary Proccesor card diagnostics Passed Booting from Floppy The server s Ethernet address and firmware version are displayed along...

Страница 48: ...ion Guide and Multiprotocol Communications Server Software Reference Guide for information on this command 2 Disconnect all active sessions Refer to the Multiprotocol Communications Server Operation G...

Страница 49: ...ng and Formatting Diskettes Entering the Firmware Monitor To use the Firmware Configuration Utility you must place the communications server in monitor mode This mode suspends normal operation and all...

Страница 50: ...he server is in the boot database of an RBCS server refer to the Remote Boot and Configuration Services User s Guide 4 Turn on the unit or if it is already on press the reset switch on the front panel...

Страница 51: ...descriptions of each parameter follow this table Current Parameters Interface address 08000203A89A J1 baud rate 9600 J2 baud rate 9600 Continuous self test Disabled Auto reboot Reboot only Initial boo...

Страница 52: ...e 1 110 2 300 3 1200 4 2400 5 9600 6 19200 7 38400 2 J2 baud rate 1 110 2 300 3 1200 4 2400 5 9600 6 19200 7 38400 3 Continuous self test d Disable e Enable 4 Auto reboot m Boot monitor r Reboot only...

Страница 53: ...ting takes effect when errors or the software ReBoot command require the server to be rebooted Boot monitor puts the server into monitor mode so it can be rebooted by the user This setting prevents th...

Страница 54: ...fies the filename of the image to be downloaded from an RBCS or TFTP FTP server and executed This string can be up to 128 characters long The default is _cs30 without the quotation marks If your boot...

Страница 55: ...If you change the Boot Protocol parameter from TFTP to SLP and back to TFTP check the Change IP TFTP Parameters menu s Address Discovery Protocol field Changing from TFTP to SLP and back to TFTP resu...

Страница 56: ...ilename to download is obtained from the BOOTP server If RARP or Local Inform ation is used the server attempts a TFTP download of the file named in the Network Boot String parameter Table 4 2 lists A...

Страница 57: ...unications server boots from BOOTP requests are sent to this address If this address is not specified BOOTP requests are sent to the broadcast address Gateway IP address If the communications server b...

Страница 58: ...onmental requirements listed in Table 1 7 on page 1 15 Temperatures outside the recommended range can impair reliability and cause diskette access errors Keep the area around the server clean Avoid ac...

Страница 59: ...damage the heads Use only alcohol based solvents 2 Immediately insert the cleaning diskette in the drive 3 Press the reset switch and wait until the Boot State light and the activity light on the dis...

Страница 60: ...lear of the fuseholder cartridge pry the spent fuse from the fuse clip with the screwdriver 6 Replace the old fuse with a new fuse of the same type size and rating Use a 3 A 250 V fast blow fuse 5 mm...

Страница 61: ...not touch pins leads or solder connections on the board Handle the board by the edges only Observe proper grounding techniques including using a foot strap and grounded mat or wearing a grounded stat...

Страница 62: ...of the module and the chassis Gently pry the module out of the slot You may feel some resistance as the connectors on the module board pull free of the motherboard 5 Insert the Ethernet interface modu...

Страница 63: ...are aware of hazards they are exposed to and of methods to minimize the danger to themselves and others Follow the instructions in this section carefully If any problems occur contact 3Com or your aut...

Страница 64: ...been running communications server software For instructions on installing a 16 port asynchronous module in a server that has never been turned on refer to Installing 16 Port Asynchronous Modules Thi...

Страница 65: ...16 port asynchronous modules d Remove the screws holding the upper portion of the back panel Using the 2 Phillips screwdriver remove the two screws located toward the outer edges of the panel as shown...

Страница 66: ...panel using the two screws Figure 5 5 shows the correct placement of these screws Again be careful not to loosen the EMI clips Figure 5 5 Replacing or Adding an 16 Port Asynchronous Module b Position...

Страница 67: ...ribbon cable and power wiring harness from the connectors on the rear of the diskette drive Fold the cables so they are out of the way Figure 5 6 shows the location of the ribbon cable and power wiri...

Страница 68: ...ide the old drive out of the bracket c Slide the new drive into the bracket d Replace the four screws 7 Replace the bracket in the chassis a Slip the keyhole slots on the bottom of the bracket over th...

Страница 69: ...possible electrical shock the server s power cord must be disconnected from the power source before accessing its internal components You need a 1 and a 2 Phillips screwdriver Follow this procedure 1...

Страница 70: ...power supply has two keyhole slots that fit over standoffs located on the bottom of the chassis You must slide the power supply far enough forward to lift it off the standoffs c Disconnect the cable...

Страница 71: ...s Slide the power supply module toward the rear of the chassis d Fasten the module in place with the screw 6 Reconnect the power supply cable to the connector on the auxiliary processor board Make sur...

Страница 72: ...rom the front of the server 4 Remove a new memory chip from its antistatic foam shipping pad If the pins have been bent carefully straighten them Orient the chip with the beveled corner closest to the...

Страница 73: ...hips 7 Replace the cover as described in Replacing the Cover Replacing the EPROM To replace the EPROM on the motherboard follow this procedure 1 Make sure server power is off and the power cord is unp...

Страница 74: ...fit easily into the sockets Orient the new EPROM in the same way as the old EPROM CAUTION Failure to orient the EPROM correctly will destroy it when the server is powered on 6 Being careful to line up...

Страница 75: ...l three screws 4 Recable any connectors whose cables have been removed 5 Reinstall any strain reliefs that have been removed Figure 2 11 on page 2 15 shows how the strain relief mechanism is installed...

Страница 76: ...nel LEDs or by error messages on the console Symptom At initial power on or during a reset Power and Self Test LEDs fail to light Meaning There is no power to the server Action Turn off the server by...

Страница 77: ...minal to the console port Enter bt to boot from diskette Model CS 3100 only or bs to boot from the network Symptom Boot fails and the monitor prompt appears on the console Action Take the following ac...

Страница 78: ...h is located on the server s left side viewed from the front of the server close to the front as shown in Figure 1 1 on page 1 3 The switch is recessed to protect it from being pressed unintentionally...

Страница 79: ...from the network Action Take the following action 1 Reset the server by pressing the reset switch on the front panel 2 If resetting the server does not resolve the problem check the cable transceiver...

Страница 80: ...LED on the single port RJ 45 module fails to light Meaning There is no connection between the module s port and the workstation hub or repeater Action Take the following action 1 Make sure the cable...

Страница 81: ...the boot protocol to TFTP and establish a safepath on the RBCS server The default safepath is to the data DUMP directory If this directory is not already present on the RBCS server you must create it...

Страница 82: ...s 1 Enter monitor mode as explained in Entering the Firmware Monitor In some instances a crash may leave the disk drive unusable because some monitor parameters were overwritten In this case the serve...

Страница 83: ...ng with the diskettes The date and time at which the crash occurred and any information available about the network traffic load at that time The state of each front panel LED indicator at the time of...

Страница 84: ...step successfully The frequency of the problem You may also be asked to send a copy of the working diskette Model CS 3100 only or a copy of the communications server software loaded on the hard disk...

Страница 85: ...up to 48 serial ports depending on the number of 16 port asynchronous modules installed Each module provides two 50 pin serial connectors each connector provides eight ports You can install up to thr...

Страница 86: ...orts DCD and CTS share pin 28 on port 0 and also pins 31 34 37 40 43 46 and 49 on the other ports This hardware configuration is called single input In the default software configuration pin 1 functio...

Страница 87: ...ircuit assignments in Table A 2 still hold Table A 2 Serial Connector Pin Assignments Software Version 6 0 Port Pin Signal Direction Pin Signal Direction 0 1 DTR0 RTS0 In 26 TXD0 In 0 2 SG0 27 RXD0 Ou...

Страница 88: ...3 Serial Connector Pin Assignments Software Version 6 1 Port Pin Signal Direction Pin Signal Direction 0 1 RTS0 In 26 TXD0 In 0 2 SG0 27 RXD0 Out 0 3 DTR 28 DCD0 CTS0 Out 1 4 RTS1 In 29 TXD1 In 1 5 S...

Страница 89: ...e AUI port This connector is an industry standard derived from IEEE Standard 802 3 Table A 4 Telco to RJ 12 Pin Assignments Port Pin RJ 45 Pin Patch Panel RJ 12 Pin Hydra Cable Pin RJ 45 Pin Patch Pan...

Страница 90: ...n Assignments Pin Number Function Signal 1 Signal ground SG 2 Carrier detect plus DCD 3 Transmit plus TXD 4 Signal ground SG 5 Receive plus RXD 6 Signal ground SG 7 Control out plus CTL OUT 8 Signal g...

Страница 91: ...DCE use a modem cable Figure A 4 Console Port Pin Numbers Table A 6 RJ 45 Port Pin Assignments Pin Number Function Signal 1 Transmit data plus TXD 2 Transmit data minus TXD 3 Receive data plus RXD 4 5...

Страница 92: ...mber Printer Interface Signal Source Description 1 1 Strobe Server 2 2 Data1 Server Data Bit 0 3 3 Data2 Server Data Bit 1 4 4 Data3 Server Data Bit 2 5 5 Data4 Server Data Bit 3 6 6 Data5 Server Data...

Страница 93: ...modem Table A 11 shows pin assignments for the DTE adapters used for attachment to a terminal host or printer These pin assignments apply only when the adapters are used in conjunction with the follow...

Страница 94: ...hese adapters Behavior of the control output RJ 12 pin 1 is determined by the TERM FlowCtrlFrom and UseDCDout software parameters while interpretation of the control inputs RJ 12 pins 3 and 6 is deter...

Страница 95: ...al In Bidirectional Flow Control DCE Attachment DTE Attachment RJ 12 Pin CS Signal RS 232 Signal RS 232 Pin RJ 12 Pin CS Signal RS 232 Signal RS 232 Pin 1 CTS out RTS in 4 1 CTS out CTS in 5 2 RXD out...

Страница 96: ...y from 3Com or your network supplier 2 ft 0 6 m CS 1 to CS 3x000 conversion cable 3Com part number 3C6100 The conversion cable terminates in two 50 pin male connectors J1 and J2 Connect J2 to the CS 3...

Страница 97: ...RXD2 7 8 8 SG2 33 32 TXD2 9 Not used 34 34 DTR2 12 10 DCD3 35 36 RXD3 10 11 11 SG3 36 35 TXD3 12 Not used 37 37 DTR3 15 13 DCD4 38 39 RXD4 13 14 14 SG4 39 38 TXD4 15 Not used 40 40 DTR4 18 16 DCD5 41...

Страница 98: ...eport a failure on the console for example CPU failure If you receive an error message refer to Chapter 6 Troubleshooting If you still receive an error message contact 3Com or your network supplier Re...

Страница 99: ...tests have begun Diagnostic Upload Completed Meaning The auxiliary processor board s diagnostics have been copied to RAM and self tests are ready to begin Do you want to enter monitor Y N Meaning The...

Страница 100: ...ess 080002089BB5 Auxiliary Processor Board Installed 128K ram installed Diagnostic Upload Completed Aux Processor Board diagnostics Passed Booting from Network Motherboard Error Messages The following...

Страница 101: ...g executed at the time of failure PRVT private or SHRD shared test name identifies the test that failed wwwwwwww is the hexadecimal data pattern returned from the memory location being tested eeeeeeee...

Страница 102: ...cess Control Register Test Failed Expected xxxx Read yyyy Meaning The control register test failed xxxx is the hexadecimal data that was written to the register yyyy is the hexadecimal data that was r...

Страница 103: ...bit is not set Status Register Failed TIC Interrupt Bit Not Set Meaning The status register s TIC interrupt bit is not set TIC Interrupt Test Failed Meaning The TIC interrupt did not occur Timer x Tes...

Страница 104: ...operation of your server Procedures for displaying and modifying firmware parameters appear in greater detail in Chapter 4 Configuration After using the monitor you must reboot the communications ser...

Страница 105: ...twork boot source an RBCS or TFTP FTP server If a diskette is in the disk drive remove it If the communications server is configured to use a network boot source disconnect it from the network or make...

Страница 106: ...1 Set the Auto reboot parameter to Boot monitor For instructions on how to modify firmware parameters refer to Changing the Configuration 2 Reset the server by pressing the reset switch on the front...

Страница 107: ...soft reset which resets the monitor s stack and internal variables and the Ethernet and serial controllers At this point 3Com or your network supplier may ask you to perform a memory dump For informa...

Страница 108: ...from the source specified in the Network Boot String parameter BT Boots from a specified source overriding the source specified in Initial Boot Source parameter CO Copies the contents of one diskette...

Страница 109: ...tax CO Description Copies the contents of a diskette to one or more diskettes Model CS 3100 only For a description of the procedure refer to Copying and Formatting Diskettes DE Syntax DE filenumber De...

Страница 110: ...d their syntax Commands in the list that are not documented in this guide are for 3Com internal use only K Syntax K Description Resets the monitor s stack and internal variables called a soft reset It...

Страница 111: ...to the diagnostic commands menu which lists all available commands The undocumented commands in the diagnostic menu are for 3Com internal use only UP Syntax UP Description Dumps the server s memory t...

Страница 112: ...es This service is available via modem or ISDN seven days a week 24 hours a day Access by Modem To reach the service by modem set your modem to 8 data bits no parity and 1 stop bit Call the telephone...

Страница 113: ...mpuServe 3ComForum is a CompuServe based service containing patches software drivers and technical articles about all 3Com products as well as a messaging section for peer support To use 3ComForum you...

Страница 114: ...section on how to contact 3Com Support from 3Com If you are unable to receive support from your network supplier technical support contracts are available from 3Com In the U S and Canada call 800 876...

Страница 115: ...4 Singapore 65 538 9368 Denmark 800 17309 South Africa 27 11 803 7404 Finland 0800 113153 Spain 900 983125 France 05 917959 Sweden 020 795482 Germany 0130 821502 Taiwan 886 2 577 4352 Hong Kong 852 25...

Страница 116: ...y processor board description 1 5 error messages B 4 B back panel 1 8 baud rate auxiliary port 4 5 console port 2 19 4 2 4 5 blanking plates 1 9 2 4 Boot monitor setting 4 5 Boot Protocol parameter 4...

Страница 117: ...7 DE command C 6 deleting file from diskette C 6 DF command C 6 diagnostic messages B 1 diagnostics See troubleshooting dimensions 1 14 diskette backup copy 4 1 booting from 3 3 3 6 copying 3 3 C 6 d...

Страница 118: ...5 hydra cable 2 11 I Initial Boot Source parameter 4 5 installation 16 port asynchronous module 2 2 to 2 5 console 2 18 Ethernet interface module 2 5 to 2 6 extension cable 2 10 hydra cable 2 11 mount...

Страница 119: ...t Received LED 1 7 3 2 parallel printer port See printer port parameters firmware See Firmware Configuration Utility or parameter name patch panel cabling 2 13 description 2 12 physical dimensions 1 1...

Страница 120: ...ule cabling 2 15 description 1 12 pin assignments A 6 problems 6 4 to 6 5 replacing 5 4 single port RJ 45 module cabling 2 17 description 1 12 pin assignments A 6 problems 6 4 to 6 5 replacing 5 4 slo...

Страница 121: ...nd C 8 upgrades adding 16 port asynchronous module 5 7 removing cover 5 7 replacing 16 port asynchronous module 5 7 cover 5 17 diskette drive 5 10 EPROM 5 16 power supply module 5 11 private memory ch...

Страница 122: ...andard warranty service for software products may be obtained by telephoning 3Com s Corporate Service Center or an Authorized 3Com Service Center within the warranty period Products returned to 3Com s...

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