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681872.bok : 681872ix.doc    113  Mon Apr 20 15:35:05 1998

113

Index

Products covered

......................................

x

Protocols supported

...............................

79

Purpose

Intel Device View

............................

60

switch

..................................................

2

VLAN

...............................................

56

Q

Quick Start description

...........................

ix

R

Rack power supply

................................

13

Read before starting

.................................

7

Rear panel

connections

.........................................

5

description

..........................................

5

Received packets

monitor the total activity

.................

62

Recover from start-up failure

................

18

Redundant power supply, connector

......

5

Remove a media module

.......................

10

Rename

a port

.................................................

49

Report Manager

.....................................

25

Report Manager, Intel Device View

....

69

Requirements

for the rack

..........................................

7

installation

........................................

22

Reset

.........................................................

5

RJ-45 port

.................................................

4

RMON

Manager

............................................

25

Manager with Intel Device View

....

69

RMON probe, find

.................................

70

RMONMGR

...........................................

72

RPS

.........................................................

16

Rubber feet

...............................................

7

S

Security, improving

...............................

36

Set date and clock to local time

............

46

SNMP

in troubleshooting

............................

82

restrictions defined by default

........

14

Software

default configuration

.......................

16

replacing

...........................................

16

Software features

.....................................

3

Spanning Tree

.......................................

14

change priority

.................................

42

port specific

......................................

52

Specifications

........................................

75

Start-up

failure recovery

................................

18

Start-up problems

in NMC

.............................................

84

troubleshooting

................................

83

Start-up procedure

.................................

13

Startup, command line, RMON

...........

72

State of the ports, change

......................

43

Statistics

alarms, RMON

.................................

71

counters, RMON

..............................

71

history, RMON

................................

71

interface, RMON

.............................

70

Status LED

.............................................

15

Storage temperature

..............................

77

STP

change cost of the path

....................

53

change priority of the port

..............

53

change state of a port

.......................

52

monitor spanning tree statistics

......

62

warning when using VLANs

..........

56

Supported protocols

..............................

79

Switch

connect devices

................................

10

hardware features

..............................

2

in a standard rack

...............................

8

indentity

............................................

37

physical features

................................

2

position

...............................................

7

purpose

...............................................

2

security

.............................................

36

software features

................................

3

Содержание Express 510T

Страница 1: ...Intel Express 510T Switch User Guide 681886 002...

Страница 2: ...ombination with said product properly exchanges date data with it Copyright 1998 Intel Corporation All rights reserved Intel Corporation 5200 NE Elam Young Parkway Hillsboro OR 97124 6497 Intel Corpor...

Страница 3: ...stallation and Uninstallation 22 Installation Under LANDesk Network Manager 22 Installation Under Windows NT 4 0 and Windows 95 23 Installation Under Windows NT 3 51 23 Uninstallation of Intel Device...

Страница 4: ...er Specifications 78 Performance Specifications 78 Module Specifications 80 7 Troubleshooting 81 Troubleshooting Tools 82 Troubleshooting Procedure 82 Isolating the Problem 82 Further Evaluation of th...

Страница 5: ...9 Ritorno di un prodotto difettoso codice RMA 99 LIMITAZIONE DI RESPONSABILT E RIMEDI 99 AVVISO FCC 100 Dichiarazione del fabbricante 100 AVVERTENZA 100 AVVERTENZA 100 Beschr nkte Hardware Garantie 10...

Страница 6: ...viii Contents...

Страница 7: ...the memory Access Local Management And the legal declarations and warnings User Guide description this guide A printed guide containing full instructions on how to install the switch and operate the s...

Страница 8: ...rk manager or per son who is qualified and authorized to install electrical equipment and who is aware of the hazards to which he she is exposed This per son must have an advanced technical background...

Страница 9: ...t AUI Attachment Unit Interface BPDU Bridge Protocol Data Unit CRC Cyclic Redundancy Check DHCP Dynamic Host Configuration Protocol ICMP Internet Control Message Protocol IEEE Institute of Electrical...

Страница 10: ...xii...

Страница 11: ...apter 1 Express 510T Switch In this chapter This chapter covers the following topics Introduction to the product Front Panel Rear Panel Installation Restoring the Software Recovering from Start up Fai...

Страница 12: ...ility Physical features This switch offers the following features Plug and play no need to configure the module to use the basic operations Provides 24 x 10 100Mbps connections Two option slots for Me...

Страница 13: ...panel shows the state of the ports so you should position the switch with the front panel facing you You can also see which ports the cables are connected to on the switch View of the front panel The...

Страница 14: ...ment pro gram 24x 10 100Base TX ports RJ 45 To connect devices using Unshielded Twisted Pair UTP cabling complying to EIA 568A Category 5 or ISO IEC 11801 Category 5 level D Product Name Intel Order C...

Страница 15: ...llowing parts Button name Function Port Status To show the operational status of each port Reset Reset or enter Maintenance Mode 970707 Awaiting drawing from EBZ 1591 230 Input 100 120V 2A 200 240V 1A...

Страница 16: ...arts are dam aged contact your dealer immediately Keep all the packaging materials in case you need to repack the switch Check all labels Read all labels and rating plates on the switch If there is an...

Страница 17: ...mm 4 inches free space on both the sides and back of the of the switch Do not allow the inlet or outlet grills to become blocked On a desktop To install the switch in a desktop environment 1 Find the...

Страница 18: ...vided because the required sizes may vary from rack to rack In an equipment rack To mount the switch in a standard equipment rack proceed as fol lows 1 Attach the mounting bracket marked Left to the l...

Страница 19: ...ion You must power off the switch before attempting to install a mod ule Static free working area The module s printed circuit board is an Electrostatic Sensitive De vice and should only be handled in...

Страница 20: ...k into position refer to the Intel Support Web Page http support intel com for full instructions on how to install the module success fully Removing the module To remove a module 1 If the switch is al...

Страница 21: ...ast access device such as a server to the switch s RJ 45 ports using UTP cable Category 5 1 Ensure that the device has a 100Mbps 100Base FX or 10 100Base TX network interface card installed If not use...

Страница 22: ...If this is not the case contact your dealer immediately and ask for the correct power cable Power cable wiring color code The wires in the power cable provided with this equipment are col ored in acco...

Страница 23: ...the female end of the power cable into the mains socket in the rear panel and plug the other end into the power supply outlet 3 Press the mains switch on the rear panel to on 4 Check that the Power LE...

Страница 24: ...than 15 minutes are purged from the switch s address table the MAC Address Age ing time No access restrictions to Local Management No SNMP restrictions No permanent MAC address entries defined A perm...

Страница 25: ...in parameters to suit your own require ments Follow the instructions in chapter 2 to change the configuration while the switch is operating Other LEDs on the front panel Introduction There are three o...

Страница 26: ...If the software in the switch s Flash Memory is corrupted you can then restore the software in the switch using the backup copy Temperature Green Normal operating temperature Orange Temperature is hig...

Страница 27: ...ctory listing to confirm the names of the files present in the switch Report log and filter files and a parameter file with the exten sion p or nvp appear in the directory listing 4 Type get filename...

Страница 28: ...he switch s MAC address The boot server contains a bootptab file with an entry for the switch which is defined by the MAC address 2 If a boot server which holds the software for the switch receives th...

Страница 29: ...resort the reason being that the software and configuration already resident in the Flash Memory is overwritten and lost Important considerations There are certain points which need to be considered w...

Страница 30: ...p file con taining the configuration from a TFTP server to the switch Command Use TFTP filename ownIP tftpIP gwIP To load software using the TFTP protocol filename the name of the file containing the...

Страница 31: ...r 2 Intel Device View In this chapter This chapter covers the following topics Installation and Uninstallation Using Intel Device View Device View Main Display Explorer Trap Window System Window Error...

Страница 32: ...s 95 A Windows NT 4 0 English language version workstation is recommended The Microsoft TCP IP protocol must be installed and configured before installation of Intel Device View Two or three button Wi...

Страница 33: ...installation required After installation reboot your PC to make changes to your system files operational Intel Device View menu items Following successful installation of Intel Device View for Window...

Страница 34: ...ndows NT 4 0 or Windows 95 To uninstall Intel Device View under Windows NT 4 0 or Windows 95 proceed as follows 1 Make sure that you have exited from all Intel Device View pro grams 2 From within the...

Страница 35: ...this display you can show activity sta tistics for the switch and individual ports Facilities Intel Device View contains the following facilities Switch Manager Displays an interactive picture of the...

Страница 36: ...switch in a new Intel Device View window 4 Click the OK Adding new switches To add additional new switches which have not been assigned an IP address to Intel Device View select the New Device icon o...

Страница 37: ...View contacts the switch Device View shows the front interface side of the switch From this display you can fully manage the switch Mouse moves The use of the mouse will make IDV easier to use and sav...

Страница 38: ...ardware details such as memory size for the RAM and Flash Memory to soft ware status information such as how long time the switch has been active since last reboot also called System up time A compreh...

Страница 39: ...ully exploit directly from Intel Device View Setting the Preferences Setting the polling intervals The polling intervals determine how often Intel Device View contacts the switch and updates the statu...

Страница 40: ...played To change the polling parameters 1 Select Monitoring Preferences 2 Click Timeout 3 Change the values 4 Click OK Setting the community for SNMP polling The community for SNMP polling determines...

Страница 41: ...o be opened by pressing the Open Device icon Close Closes Intel Device View for the switch Save Saves the software in the switch with its current file name Save As Saves the software in the switch to...

Страница 42: ...ormation for the switch and the switch links Tools menu The Tools menu gives access to the following facilities for managing the switch a report manager for uploading reports logs and the parameter bl...

Страница 43: ...ws you to display man agement information for example VLANs on the switch If a switch is disabled or not operational it is displayed with a red cross through it General management information for the...

Страница 44: ...The System window is a log of all the major switch events with date and times for example return to factory default filter entry settings modules inserted in slots Errors Window Errors window The Erro...

Страница 45: ...ange the setup of the switch In this chapter you will find all the instructions you need to change setups that affect the switch and the ports Changing the Setup of the Switch Changing the Setup of th...

Страница 46: ...o Local Management via the Console port and or Telnet Specify a time of no input after which the connection with Local Management is terminated Change the password for moving files with TFTP Specify u...

Страница 47: ...ing the switch To assist with switch identification and administration you can change certain switch details name location and contact person 1 Select Configuration Device Setup 2 Click System 3 Chang...

Страница 48: ...the required number of minutes 5 Click OK Changing the flow control Flow control prevents the loss of frames during busy periods To change the default flow mechanism on all ports 1 Select Configurati...

Страница 49: ...are the most likely parameters to cause the switching mode to change they are not the only ones Changing the time to measure errors The sample time should be the shortest time needed to detect errors...

Страница 50: ...ic error types To change the number of upper and lower limits 1 Select Configuration Device Setup 2 Click Switching 3 Click Advanced 4 Click the required parameter 5 Type the number of errors or runts...

Страница 51: ...ve two switches To the left we see the two switches connected and the ports are grouped in two VLANs A and B On the right we have enabled STP STP blocks the path be tween X and Z to avoid looping and...

Страница 52: ...ng the message age expiry time To change the maximum time between protocol information being re ceived and discarded 1 Select Configuration Device Setup 2 Click Spanning Tree 3 Click Message Age Timer...

Страница 53: ...onfiguration Device Setup 2 Click Spanning Tree 3 Click Enable All Ports The ports are able to resolve problematic network loops using STP 4 Click OK Authentication Purpose SNMP is a fully defined int...

Страница 54: ...ed to carry out SNMP management on the switch 1 Select Configuration Device Setup 2 Click Authentications 3 Click Send trap when authentication violation A message will be sent to the Traps window if...

Страница 55: ...e changes that occur in the SNMP agent system The traps list shows where SNMP traps generated by the switch are sent You can Add a new entry to the list Delete an entry Edit existing entries Adding a...

Страница 56: ...ur local time 1 Select Configuration Device Setup 2 Click Date Time 3 Click Insert Current PC Date Time to show the present settings If this is satisfactory click OK Note The clock displays the time t...

Страница 57: ...nauthorized personnel changing configurations 1 Select Configuration Device Setup 2 Click Local Management 3 Select the password you want to change 4 Type the old password 5 Type the new password 6 Ag...

Страница 58: ...lect OK Changing the Setup of the Port Purpose You can configure the port to operate in different ways according to your network s requirements Change the port state Select the auto negotiation mode C...

Страница 59: ...2 Select Configuration Port Setup 3 Click General 4 Click in the Description field 5 Type the new name 6 Click OK Location for a port To specify the location for example an office number or depart men...

Страница 60: ...ses are defined as permanent entries they are not purged To disable the port 1 Click the port you want to disable 2 Select Configuration Port Setup 3 Click Port Mode 4 Click Enable Port If there is a...

Страница 61: ...k Half Duplex or Full Duplex Half allows either transmission or receipt of the data and Full allows both transmission and receipt of the data 5 Click OK Changing the port speed To change the speed at...

Страница 62: ...tup 3 Click Port Mode 4 Click Flow Control 5 Click the flow control you want Default is the same flow control as specified in Configura tion Device Setup 6 Click OK Port Specific Spanning Tree Purpose...

Страница 63: ...rt a low cost if it is connected to a faster network segment To change the overall cost of the path between a port and the root port 1 Click the port you want to change 2 Select Configuration Port Set...

Страница 64: ...Standard Configuration Changing the Setup of the Port 54 3 5 Type the required value If there are two ports with the same value the port with the lowest port number will be chosen 6 Click OK...

Страница 65: ...chapter covers VLANs Virtual LANs Create logical network groups Virtual LANs by segmenting the switch for example according to the subnetting scheme within your network Each VLAN is an isolated group...

Страница 66: ...ecify which ports can receive messages Warning When using the Spanning Tree facility only use one VLAN If you do use two or more VLANs this may cause unexpected changes in your network topology Policy...

Страница 67: ...LAN 1 Select Configuration VLAN Setup 2 Click the name of the VLAN you want to delete Note you cannot delete this VLAN if it is the Designated Manage ment VLAN To do this click another VLAN click Prop...

Страница 68: ...u have ports on which you only have IP traffic then you can use the IP rules You must specify this Port and MAC learning will still be used Within the VLAN there are some ports that you want to use IP...

Страница 69: ...59 Chapter 5 Managing the Switch In this chapter This chapter covers the following topics Monitoring the Switch s Performance Monitoring the Port s Performance Tools for the Switch...

Страница 70: ...Configure system switching IP spanning tree authentica tion and trap parameters for the switch Configure port related parameters View traps logs traces and reports generated by the switch Monitor port...

Страница 71: ...vity level 2 Right click a port and select Common Scaling Freeze Y axis Stop collection Print or Change Colors from the popup menu Monitoring the total activity of transmitted packets To view the tota...

Страница 72: ...reeze Y axis Stop collection Print or Change Colors from the popup menu Monitoring the total number of errors To view the total error activity of the packets on all the ports 1 Select Monitoring Devic...

Страница 73: ...63 Overview of all the ports To view the setups of all the ports on the switch 1 Select Monitoring Port Overview 2 Double click a port to get the specific details on port perfor mance faults packet di...

Страница 74: ...Explorer by right clicking the VLAN name and selecting Monitor 2 Click the name of the VLAN then click Details to view details of that VLAN Click on either of the tabs to view more details Tab Name S...

Страница 75: ...dicate the different states of activity Select Help Dis play Legend for further information on LED states Monitoring the performance of a port To monitor the performance of a specific port 1 Click the...

Страница 76: ...s discards and observa tions transmitted and received 3 To change the display from numerical to graphical click on one or more of the numbers and select Tools Graph 4 Select Options Reset Counters to...

Страница 77: ...he port 2 Select Monitoring Port Activity RX Packets 3 Select View Stop Collection followed by File Print to print the graph Monitoring the packets transmitted from a port To monitor the transmitted p...

Страница 78: ...vailable The switch has various tools to help with management Tab Name Shows the VLAN s Double click a row to show the VLAN Table in which this port is contained MAC addresses learned on this port in...

Страница 79: ...eport Manager 2 Double click IP Address and type the correct IP address for the device you want to receive the directory 3 Select a directory from the Directory list box and click View RMON Manager Wh...

Страница 80: ...iew with the interfaces shown as icons A trap view showing SNMP traps received from the probe Supported functions The following RMON functions are supported Interface statistics incl Vital Statistics...

Страница 81: ...a graph from the History Graph Setup window and press OK Alarms Alarm is a useful feature in the RMON Manager it enables you to set your own thresholds for when the network activity requires some at...

Страница 82: ...switch with the community name production the IP address 101 102 103 104 and the switch name Production_switch then the command entered in the command line is as follows RMONMGR IP 101 102 103 104 CO...

Страница 83: ...m log Normal traffic throughput Number of errors discards observations and collisions for the switch An overview of port specific errors discards observations and collisions Spanning Tree Protocol for...

Страница 84: ...ment application Instructions on how to access the application have been mentioned earlier Access from the CONSOLE port Details are in Quick Start Access using Telnet Select Tools Local Management Fin...

Страница 85: ...75 Chapter 6 Technical Specifications In this chapter This chapter covers the following topics Physical Specifications Power Specifications Performance Specifications Module Specifications...

Страница 86: ...y UL 1950 CSA C22 2 No 950 IEC 950 EN 60950 Emission FCC 47 CFR part 15 Class A EN 55022 Class A CISPR 22 Class A VCCI Class 1 ITE C Tick Mark Susceptibility EN 50082 1 IEC 1000 4 2 IEC 1000 4 3 IEC 1...

Страница 87: ...s Connections The switch has the following number of connections Operating temperature 41 F to 104 F 5 C to 40 C Storage temperature 13 F to 158 F 25 C to 70 C Humidity Less than 85 non condensing Alt...

Страница 88: ...sses Throughput Internal switching bandwidth 2 1Gbps CPU IDT 79R3041 16 MHz Nominal power supply voltages 100 to 120 V AC 2 5 A 200 to 240 V AC 1 5 A Class 1 protective ground Voltage range 90 to 135...

Страница 89: ...uffer RAM Mbytes 4 CPU RAM Mbytes 1 Subject Document Reference Bridge Spanning Tree IEEE 802 1D Ethernet IEEE 802 3 Fast Ethernet IEEE 802 3U Auto negotiation IEEE 802 3X UDP RFCs 768 950 and 1071 TFT...

Страница 90: ...and LEDs Ether like MIB RFC 1643 RIP version 2 RFC 1723 RMON RFC 1757 Subject Document Reference Media Module Name Intel Order Code 10 100TX Module for 500 Series Switches ES500MTX 100FX Module for 5...

Страница 91: ...Chapter 7 Troubleshooting In this chapter This chapter covers the following topics Troubleshooting Tools Troubleshooting Procedure Typical Problems and Causes Reporting Problems to Intel Customer Supp...

Страница 92: ...d loca tions thus allowing the possibility of performing limited trouble shooting from an SNMP Management Center Troubleshooting Procedure Isolating the Problem To isolate the problem If the switch ha...

Страница 93: ...rts and the traffic patterns on each port The general facilities available within the Monitor are described in the following subsections The use of these facilities depends on the problem and on any r...

Страница 94: ...corrupted somehow it issues BOOTP requests on the network to look for a boot server to provide the necessary software This request contains the switch s MAC address and any BOOTP server that has an e...

Страница 95: ...n the network and Spanning Tree is not enabled Action Either enable STP on all the ports using Device Setup or specific ports using Port Setup Communication Problems The most common problems are cable...

Страница 96: ...s that you can do to enable us to begin solving your problem quickly Intel Device View makes the gathering of such information easy and presents it in an easy to interpret format Things to do prior to...

Страница 97: ...might have affected the switch The information in this report can be of great help to us in finding a solution to the problem as quickly as possible Further information on Customer Support For informa...

Страница 98: ...Troubleshooting Reporting the Problem to Intel Customer Support 88 7...

Страница 99: ...ace or repair the product with either new or remanufactured product or parts and the returned product be comes Intel s property Intel warrants the repaired or replaced product to be free from defects...

Страница 100: ...charge except as set forth below provided that you deliver the product along with a return material authorization RMA number either to the company from whom you purchased it or to Intel If you ship th...

Страница 101: ...may not apply to you Software provided with the hardware product is not covered under the hardware warranty described above See the applicable soft ware license agreement which shipped with the hardw...

Страница 102: ...ified to meet CISPR 22 Class A requirements and are registered with VCCI Class 1 products WARNING This is a Class A product In a domestic environment this product may cause radio interference in which...

Страница 103: ...tgelieferte Netzkabel zu ndern oder zu verwenden wenn es sich nicht um genau den erforderlichen Typ handelt Das System darf weder an eine Stromquelle angeschlossen sein noch eine Verbindung mit einer...

Страница 104: ...revoltage y desconectar el m dem de las l neas de telecomunicaci n durante las tormentas Previsto de una toma de tierra correctamente instalada No intente modificar ni usar el cable de alimentaci n de...

Страница 105: ...re 3 Copy the Software in whole or in part except as provided in this Agreement TRANSFER You may transfer the Software to another party if the receiving party agrees to the terms of this Agreement and...

Страница 106: ...s terms and conditions Upon termination you will immediately destroy the Software or return all copies of the Software and documentation to Intel U S GOVERNMENT RESTRICTED RIGHTS The Software and docu...

Страница 107: ...voy Intel devient sa propri t Intel garantit que le produit remplac ou r par est exempt de d fauts mat riels ou d assemblage Cette garantie porte sur une p riode ne d passant pas i quatre vingt dix 90...

Страница 108: ...accord pr alable du fabricant peut annuler son droit d utiliser ledit quipement Avis du fabricant Intel certifie que Intel Express 500 Series Switches se conforme la norme europ enne 89 33 EEC et sui...

Страница 109: ...o di i novanta 90 giorni dalla data di spedizione di ritorno oppure ii per il periodo di tempo rimanente della garanzia originale di tre 3 anni secondo quale periodo risulti essere il pi lungo Questa...

Страница 110: ...disfa o supera inoltre i requisiti EN 60950 TUV Questo prodotto stato sottoposto a prova e verificato secondo i requisiti CISPR 22 Classe A AVVERTENZA Questo un prodotto di Classe A In un ambiente res...

Страница 111: ...zen oder reparieren und zwar durch ein neues oder aufger stetes Produkt oder neue oder aufger stete Komponenten und das zur ckgegebene Produkt geht wieder in das Eigentum von Intel ber F r das reparie...

Страница 112: ...er ohne Geneh migung des Herstellers nderungen und Modifizierungen am Ger t vornimmt Erkl rung des Herstellers Wir best tigen hiermit da der Intel Express 500 Series Switches die Anforderungen der EU...

Страница 113: ...ualquiera de los siguientes per odos que sea mayor I noventa 90 d as despu s de la fecha de despacho de la devoluci n o ii el per odo de tiempo restante de la garant a original por tres 3 a os Esta ga...

Страница 114: ...icante podr an anular la autori dad del usuario para funcionar este equipo Declaraci n del fabricante Se certifica que el Concentrador apilable Intel Express 500 Series Switches la Directiva EU 89 33...

Страница 115: ...Garant a limitada del hardware Limited Hardware Warranty 105...

Страница 116: ...Limited Hardware Warranty Garant a limitada del hardware 106 A...

Страница 117: ...Garant a limitada del hardware Limited Hardware Warranty 107...

Страница 118: ...Limited Hardware Warranty Garant a limitada del hardware 108 A...

Страница 119: ...tiation disable 50 B Bootload using maintenance mode 19 Button functions 5 C Cable for the Console Port 11 for the LAN Ports 11 shielded 10 wiring color code 12 Change default forwarding mode 38 duple...

Страница 120: ...er 5 Conventions in this manual x Cooling fan 5 Counters interface statistics RMON 71 CPU type 78 D Date set 46 Default configuration 16 forwarding mode change 38 settings after start up 14 Delete a V...

Страница 121: ...ace statistics 70 RMON Manager 69 statistics counters 71 switch performance 61 65 troubleshooting traps 71 Interface card for workstation 11 Interface statistics RMON 70 IP change details 40 command l...

Страница 122: ...ontents 6 Parts rear panel 5 Password change 47 loss 83 Performance problems troubleshooting 85 Physical features 2 Policy based VLANs 56 Port 10 100Base TX 4 CONSOLE 4 DB 9 4 disable 50 disabled and...

Страница 123: ...nd clock to local time 46 SNMP in troubleshooting 82 restrictions defined by default 14 Software default configuration 16 replacing 16 Software features 3 Spanning Tree 14 change priority 42 port spec...

Страница 124: ...ation problems 85 configuration changes are lost 84 contacting technical support 86 isolating a problem 82 lost password 83 NMC start up problems 84 performance problems 85 Spanning Tree topology chan...

Страница 125: ...115 Index...

Страница 126: ...tel has technical support centers worldwide Many of the centers are staffed by technicians worldwide who speak the local languages For a list of all Intel support centers the telephone numbers and the...

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