Manuale d’uso / di manutenzione del prodotto SuperStack 3 3C17204 del fabbricante 3Com
Vai alla pagina of 100
http://www.3com.com/ Part No. DUA1720-3AAA 09 Published July 2005 SuperStack ® 3 Switch 4400 Family Getting Started Guide Switch 4400 (3C17203 ) Switch 4400 (3C17204 ) Switch 4400 PWR (3 C17205) Switch 4400 SE (3C17206) Switch 4400 FX (3C17210 ) DUA1720-3AAA09.
3Com Corporati on 350 Campus Drive Marlborough, MA 01752-3064 Copyright © 2001, 2002, 2003 , 2004, 2005 3Com Co rporation. All rights r eserved. No part of this documentation may be r epr oduced in a.
C ONTENTS A BOUT T HIS G UIDE Before Y ou Start 7 Release Notes 7 About Y o ur CD-ROM 8 Conventions 8 Related Documen tation 9 Accessing Online Documentation 10 Documentation Comments 10 1 I NTR ODUCI.
Rules For Stacking Units 28 The Power -up Seque nce 30 Powering-up th e Switch 4400 30 Checking for Correc t Operation of LEDs 30 Connecting a Redundant Powe r System 30 Using Power over Ethernet 31 C.
4 P RO B LE M S OLVING Solving Pr oblems Indicated by LEDs 58 Solving Hardwar e Pr oblems 59 Solving Communication Problems 61 Solving Software Upgrade Pr oblems 63 A S AFETY I NFORMATION Power Cord S.
I NDEX R EGULATORY N OTICES DUA1720-3AAA09.book Page 6 Wednesday , July 6, 2005 4:33 PM.
A BOUT T HIS G UIDE This guide provides all the information you need to install and use the following switches in their default state: ■ SuperStack ® 3 Switch 4400 (3C17203) ■ SuperStack ® 3 Swi.
8 A BOUT T HIS G UIDE About Y our CD-ROM The CD-ROM contains the followin g: ■ Online documentation for the Sw itch 4400 — refer to Related Documentation on page 9 for details.
Related Documentation 9 Related Documentation In addition to this guide, each Switch documentation set includes the following: ■ SuperStack 3 Switch Implementation Guide This guide contains information o n the features supported by your Switch and how they can be used to optimize your netw ork.
10 A BOUT T HIS G UIDE ■ Release No tes These notes p rovide information about the current software r elease, including new features, modifications, and known problems. The Release No tes are supplied in PDF format on the CD-ROM that accompanies the Switch.
Documentation Comments 11 Please include the following information when commenting: ■ Document ti tle ■ Document part number (on the title page) ■ Page number (if appropriate) Exampl e: Part Num.
12 A BOUT T HIS G UIDE DUA1720-3AAA09.book Page 12 Wednes day, July 6, 2005 4:33 PM.
1 I NTR ODUCING THE S UPER S TACK 3 S WITCH 4400 This chapter co ntains introductory information about t he Switch 4400 and how it can be used in your network.
14 C HAPTER 1: I NTRODUCING THE S UPER S TACK 3 S WITCH 4400 About the Switch 4400 The Switch 4400 is a stackable 10/100 Mbps Ether net switch and provides high-performance workgr o ups with a backbone to server connection.
Switch 4400 — Front View Detai l 15 Switch 4400 — Front View Detail Figure 1 Switch 4400 FX — fr ont view Figure 2 Switch 4400 (24-port) / Switch 4400 SE — fr ont view Figure 3 Switch 4400 PWR.
16 C HAPTER 1: I NTRODUCING THE S UPER S TACK 3 S WITCH 4400 Figure 4 Switch 4400 (48-port) — fr ont view WA RN I N G : RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot be used as standard tradition al telephone sockets, or to connect the unit to a traditional PBX or public telephone netw ork.
Switch 4400 — Front View Detai l 17 connector that allows both the transmit and the receive fibers to be connected in the same space as an RJ-45 port. LEDs Ta b l e 4 lists LEDs visible on the front of the Switch, and how to r ead their status according to color .
18 C HAPTER 1: I NTRODUCING THE S UPER S TACK 3 S WITCH 4400 Port LEDs — Power over Et hernet mode (3C17205 only) Packet Green Power is being delivered to the port. Green flashing Exceeded port power limit (overCurrent MIB state) or unable to supply power due to unit over budget (denyLowPriority MIB state).
Switch 4400 — Rear View Detail 19 Switch 4400 — Rea r View Detail Figure 5 Switch 4400 (all models) — r ear view Power Socket The Switch automatica lly adjusts its power setting to any supply voltage in the range 90-240 V AC.
20 C HAPTER 1: I NTRODUCING THE S UPER S TACK 3 S WITCH 4400 Default Setti ngs Ta b l e 5 shows the defau lt settings for the Switch 4400: Ta b l e 5 Default Settings Feature Switch 4400 Automatic IP .
Default Settings 21 T o make Advanced T raffic Priori tization, RADIUS Based Auto QoS Assignment, and T raffic Sh aping ava ilable on the SuperStack 3 Switch 4400 SE, upgrade the pr oduct to the Switch 440 0 SE Enhanced Software Upgrade (3C17207).
22 C HAPTER 1: I NTRODUCING THE S UPER S TACK 3 S WITCH 4400 DUA1720-3AAA09.book Page 22 Wednes day, July 6, 2005 4:33 PM.
2 I NSTALLING THE S WITCH This chapter contains the inf ormation you need to install and set up the Switch 4400. It covers the following topics: ■ Package Contents ■ Choosing a Suitable Site ■ Rack-mounting ■ Placing Units On T op of Each Other ■ Stacking Units ■ The Power -up Sequence WARNING: Safety Information.
24 C HAPTER 2: I NSTALLING THE S WITCH Package Contents ■ Switch unit ■ CD-ROM (inclu des document ation r elated t o your Switch) ■ Getting Started Guide (this guide) ■ Management Quick Refer.
Rack-moun ting 25 ■ The air is as free fr om dust as possible. ■ The unit is installed in a clean, air conditioned environment. ■ No more than eight Switch units ar e placed on top of one another , if the units are fr ee-standing. ■ The Switch is situated away from sour ces of conductive (electrical) dust, for example laser printer s.
26 C HAPTER 2: I NSTALLING THE S WITCH Figure 6 Fitting a bracket for rack-mounting 3 Insert the two screws and tighten with a suitable screwdriver . Y ou must use the screws supplied w ith the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty .
Placing Units On Top of Each Other 27 Placing Units On T op of Each Other If the Switch units ar e fr ee-standing, up to eight units can be placed one on top of the other . If you are mixing a variety of SuperStack ® 3 Switch and Hub units, the smaller units must be positioned at the top.
28 C HAPTER 2: I NSTALLING THE S WITCH Cascade Extender Unit . The Cascade Module is insta lled into the expansion slot at the rear of the Switch and the Cascad e Extender Unit plugs into the Cascade Module. Figure 8 Stacking mor e than two Switch 4400 units For information on ordering the Cascad e Kits contact your supplier .
Stacking Units 29 ■ The Cascade Extende r Unit is hot-insertable. This allows its host Switch unit to b e removed and re placed without disturbing the rest of the stack. ■ Only 3Com ® Cascade Cables can be used to connect between Cascade Modules/Cascade E xtender Units.
30 C HAPTER 2: I NSTALLING THE S WITCH The Power -up Sequence The following sections describe how to get your Switch 4400 powered-up and ready for operation. Powering-up the Switch 4400 Use the following sequence of steps to power -up the Switch. 1 Plug the power co r d into the power soc ket at the rear of the Switch.
The Power-up Sequence 31 CAUTION The Switch has no ON/OFF switch ; the only metho d of connecting or disconnecting main s power is by connect ing or disconnecting the power cord. CAUTION: The Switch can only use a Su per Stack Advanced Redundant Power System output.
32 C HAPTER 2: I NSTALLING THE S WITCH Ta b l e 7 Cables required to connect the Switch 4400 to other devices if auto-negotiation is disabled CAUTION: If you want to install the Switch usin g a Category 5E or Category 6 cable, 3Com reco mmends that you briefly connect the cable to a grounded port before connect ing ne twork eq uipment.
3 S ETTING U P FOR M ANAGEMENT Y our Switch can operate in its default state, that is, you can install it and it will work straight away (plug-and- play). Ho wever , to make full use of the features of fer ed by the Switch, and to chan ge and monitor th e way it works, you have to acce ss the management software that r esid es on the Switch.
34 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Setting Up Overview This section gives an overview of what you need to do to get your Switch set up an d r eady fo r manage ment when it is in its default st ate. The whole setup process is summarized in Figur e 9 .
Setting Up Overview 35 CAUTION: T o protect your Switch from unauthorized access, you must change all three default passwords as soon as possible, even if you do not intend to actively manage your Swit ch. For more inform ation on de fault users and changing default passwords, see “Def ault Users and Passwords” on page 54 .
36 C HAPTER 3: S ETTING U P FOR M ANAGEMENT This process is known as Auto-IP and is the same mechanism used by W indows 98 and W ind ows 2000. IP a ddresses configured by Auto-IP are temporary as they cannot be r outed but are useful for small networks which are not connected to other netw orks, or for initial config uration.
Manually Configuring IP In formation 37 Manually Configuring IP Information Y ou can manually configure the Switch IP information in the following ways: ■ Connecting to a front panel port — Connect a workstat ion using an Ether net cable to a front panel port of the Switch.
38 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Connecting the W orkstat ion to the Switch 1 Connect the workstation to a front panel port using an Ethernet cable as shown in Figure 10 .
Manually Configuring IP In formation 39 If there is no response, wait for one minute then re-enter the default IP address. 3 At the login and password pr o mpts, enter admin as your user name and press Return at the p assword pr ompt (default user n ame and password).
40 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Figure 11 Example top-level command line interface menu 4 At the Select menu option prompt you can either: ■ enter th e protocol ip basicConfig command. At the Enter configuration method prompt enter manual .
Manually Configuring IP In formation 41 Pre-r equisites ■ A workstation with terminal emulat ion software installed, such as Microsoft Hyperterminal. This software allows you to communicate with the Switch via the console port directly , or thr ough a modem.
42 C HAPTER 3: S ETTING U P FOR M ANAGEMENT 2 Open your terminal emulation software and configure the COM port settings to which you have connected th e cable.
Manually Configuring IP In formation 43 Figure 13 Example top-level command line interface menu 3 At the Select menu option prompt you can either: ■ enter th e protocol ip basicConfig command. At the Enter configuration method prompt enter manual . The screen prompts you to enter IP information.
44 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Viewing Automatically Configured IP Information If you allow the Switch to automatica lly configure its own IP information you need to discover and view the IP information bef ore you can begin to manage the Switch.
Viewing Automati cally Configured IP In formation 45 ■ A suitable cable: ■ A standard null modem cable — if you ar e connecting directly to the console port, or ■ A standard modem cable — if y ou are connecting to the console port using a modem.
46 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Viewing IP Information via the Console Port Y ou are now r eady to view the auto matically allocate d IP information using the command line interface. 1 Connect your Switch to the network us ing an Ethernet cable.
Methods of Managing a Switch 47 The initial set up of your Switch is now complete and the Switch is r eady for you to set up your chosen management method.
48 C HAPTER 3: S ETTING U P FOR M ANAGEMENT Command Line Interface Management using SSH The Switch 4400 supports Secure Shell version 2 (SSHv2), allowing secure access to the Command Line Interface of the Switch.
Setting Up Command Line Interface Management 49 Setting Up Command Line Interface Management This section describ es how you can set up command line interface management using a local console po rt co nnection or over the network.
50 C HAPTER 3: S ETTING U P FOR M ANAGEMENT If the login prompt does not display immediately , press Return a few times until it starts. 6 If you have logged on correctly , the top-level menu of the command line interface for the Switch you wish to manage is displayed as shown in Figur e 13 on page 43 .
Setting Up Web Interface Management 51 7 Enter your usual user name and password to access the CLI commands. For increased security please change the default password when using SSH for the first time.
52 C HAPTER 3: S ETTING U P FOR M ANAGEMENT T o enable style sheets in Netscape Navigato r 4.76 on Solaris 2.6, open Netscape Navigator and select Edit > Preferences > Fonts . Select the Use document-specified fonts, including Dynamic Fonts radio button.
Setting Up SNMP Management 53 ■ The management workstation is connected to the Switch using a po rt in the man agement VLAN. By defa ult, VLAN 1 is the management VLAN containing all ports on the Switch. Y ou can use the 3Com Network Director application that is available from the 3Com website to provide SNMP ma nagement for your Switch.
54 C HAPTER 3: S ETTING U P FOR M ANAGEMENT For detailed descriptions of CLI commands for co nfiguring SNMPv3 security for users, please refer to the security device user menu. Please refer to the Management Inte rface Reference Guide supplied in HTML format on the CD-ROM that accompanies your Switch.
Default Users and Passwords 55 T able 10 Default SNMP Users Changing Default Passwords Y ou can change the default passwo rds using either: ■ The gettingStarted command o n the CLI, or ■ The security device user modify command on the CLI, or ■ The Se curity > Device > User > Modify operation on the web interface.
56 C HAPTER 3: S ETTING U P FOR M ANAGEMENT DUA1720-3AAA09.book Page 56 Wednes day, July 6, 2005 4:33 PM.
4 P RO B L E M S OLVING This chapter help s you to diagnose and solve problems you may have with the operation of your Switch. There is also an explanation of IP addressing.
58 C HAPTER 4: P ROBLEM S OLVING Solving Problems Indicated by LEDs If the LEDs on the Switch indicate a problem, r efer to the list of suggested solutions below . The Power LED does not light Check that the power cable is firmly connected to the Switch and to the supply outlet.
Solving Hardware Problems 59 ■ Auto-negotiation settings are the same at both ends. Auto-negotiation problems will occur with 10BASE-T or 100BASE-T where auto-negotiation is disabled a nd incorr ect.
60 C HAPTER 4: P ROBLEM S OLVING Switch. The monitori ng system polls the fan status at periodic intervals while the unit is powered up. If one or mor e fans have failed in the Switch, a warning messa.
Solving Communication Problems 61 If yes, check that: ■ The air vents are not obstructed. ■ The ambient temperatures and envir onmental conditions meet those specified in Appendix C . 4 Power cycle the unit. If a further thermal shutdown occurs, and all environmental conditions ar e satisfactory , return the unit to 3Com.
62 C HAPTER 4: P ROBLEM S OLVING ■ The Switch’ s IP address has bee n entered correctly in your network management application (such as 3Com Network Director). The following is a brief overview of IP addr essing, and how to obtain a register ed IP address.
Solving Software Upgrade Problems 63 Solving Software Upgrade Problems Y ou can upgrade the management sof tware of the Switch by using the System > Control > Software Upgrade operation in the Web Interface, or the system control softwareUpgrade command in the command line interface.
64 C HAPTER 4: P ROBLEM S OLVING DUA1720-3AAA09.book Page 64 Wednes day, July 6, 2005 4:33 PM.
A S AFETY I NFORMATION Y ou must read the following safety information befor e carrying out any installation or removal of components, or any maintenance pr ocedures on the Switch 4400. WAR N I NG : Warnings contain directions that you must follow for your personal safety .
66 A PPENDIX A: S AFETY I NFORMATI ON przestrzega ć wszystkic h wskazówek. Przed instalacj ą lub demonta ż em urz ą dzenia nale ż y uwa ż nie przeczyta ć poni ż sze informacje o bezpiecze ń stwie.
Important Safety Information 67 WAR N I NG : The appliance coup ler (the connector to the unit and not the wall plug) must have a configuration for mating with an EN60320/IEC320 appliance inlet. WAR N I NG : The socke t outlet must be near to the unit and easily accessible.
68 A PPENDIX A: S AFETY I NFORMATI ON WARNING: Fiber Optic ports – Optical Safety Never look at the transmit LED throu gh a magnifying device while it is powered on. Never look directly at t h e fiber TX port and fiber cable ends when they are powered on.
L’information de Sécurité Importante 69 A VERTISSEMENT : Cor don électrique: Il doit être agréé ans le pays d'utilisation: A VERTISSEMENT : Le coupleur d'ap pareil (l e connecteur du groupe et non pas la prise murale) doit respecter une configuration qui permet un branchement sur une entrée d'appareil EN60320/CEI 320.
70 A PPENDIX A: S AFETY I NFORMATI ON connexion portant l'appellation Neutre et avec raccordement direct à la terre (masse). A VERTISSEMENT : Points d’accès RJ-45.
Wichtige S icherhe itsinfor mationen 71 VORSICHT : Wenn die Switch 4400 Einheit in einer Stapel mit anderen SuperStack 3 Hub Einheiten eingebaut werden soll, muß die Switch 4400 Einheit unter die sch maleren Hub Einheiten eing ebaut werden. VORSICHT : Das Gerät muß geerdet sein.
72 A PPENDIX A: S AFETY I NFORMATI ON VORSICHT : Faseroptikanschlüsse – Optische Sicherh eit . Niemals mit einem V ergrößerung sgerät ein Übertragungs-LED betrachten, während dieses eingesch altet ist. Niemals direkt au f den Faser -TX-Anschluß und auf die Faser k abelenden schauen, während diese eingeschaltet sind .
Información de seguridad importante 73 ADVERTENCIA: conjunto de c ables eléctr icos: debe estar homologado para el país donde se utilice: ADVERTENCIA: el acoplador del equipo (el co nector para la unidad y no la toma de la pared) debe tener un a configuración que se adapte a una entrada del equipo EN60320/IEC32 0.
74 A PPENDIX A: S AFETY I NFORMATI ON ADVERTENCIA: sólo para Fr ancia y Perú: esta unidad no puede recibir corriente de fuentes IT†. Si las fuentes de suministro de corriente son de tipo IT , esta.
Importanti Informazioni di Sicurezza 75 ADVERTENCIA: si no hay instalado un Expansion Module, compruebe que el panel de cegamiento está acoplado apretando todos los tornillos con una herramienta adecuada.
76 A PPENDIX A: S AFETY I NFORMATI ON A VVERTENZA: l'accoppiatore (il connett ore all'unità e non la spina a muro) deve avere una config uraz ione abbinabile a una presa EN60320/IEC320. A VVERTENZA: la presa deve trovars i vicino all'unità ed essere facilment e accessibile.
Wa¿ne informacje o zabezpieczeniach 77 Non guardare mai il LED di trasmission e attraverso uno strumento ottico di ingrandimento quando è acceso . No n guardare mai direttamente la porta TX a fibre ottiche e le estrem ità del cavo a fibre ottiche quando sono accese.
78 A PPENDIX A: S AFETY I NFORMATI ON OSTRZE Ż ENIE: Z łą czka urz ą dzenia (pod łą czo na do prze łą cznika, a nie do wtyczki ś ciennej) musi by ć odpowiednio do pasowana do normy EN60320/IEC320 otworu wlotowego. OSTRZE Ż ENIE: Gniazdo zasilaj ą ce musi by ć umieszczone w pobli ż u urz ą dzenia i musi by ć ł atwo dost ę pne.
Wa¿ne informacje o zabezpieczeniach 79 RJ-45, sieciowe systemy telefoniczne lub telefony sieciowe. Zarówno os ł oni ę te, jak i nieos ł oni ę te przewod y z danymi wraz z os ł oni ę tymi lub nieos ł oni ę tymi wtykami mog ą by ć pod łą czone do tych gniazd.
80 A PPENDIX A: S AFETY I NFORMATI ON OSTRZE Ż ENIE: Podczas pod łą czania kabla do zasila cza RPS nale ż y upewni ć si ę , ż e wy łą cz nik w zasilaczu jest w pozycji otwartej (wy łą czony).
B P IN - OUTS Null Modem Cable 9-pin to RS- 232 25-pin PC-A T Seria l Cable 9-pin to 9-p in DUA1720-3AAA09.book Page 81 Wednes day, July 6, 2005 4:33 PM.
82 A PPENDIX B: P IN - OUTS Modem Cable 9-p in to RS- 232 25-pin RJ-45 Pin Assignments Pin assignments are identical for 10BASE-TX and 100BASE-T RJ-45 connectors.
RJ-45 Pi n Assignments 83 T able 12 Pin assignments Pin Number 10/100BASE-T 1000BASE-T Ports configured as MDIX 1 Receive Data + Bidirectional Data B+ 2 Receive Data - Bidirectional Data B- 3 Transmit.
84 A PPENDIX B: P IN - OUTS DUA1720-3AAA09.book Page 84 Wednes day, July 6, 2005 4:33 PM.
C T ECHNICAL S PECIFICATIONS Switch 4400 (24-port) and Switch 4400 SE Physical Dimensions Height: 44 mm (1.7 in.) x Width: 440 mm (17 .3 in.) x Depth: 274 mm (10.
86 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standard s Supported SNMP SNMP protocol (RFC 1157) SNMPv2c (RFC 1901-190 7) SNMPv3 (RFCs 3 410-3418) MIB II Traps (RFC 1215) MIB-II (RFC 1213) Bridge MIB (RF.
Switch 4400 PWR (24-port) 87 Switch 4400 PWR (24-port) Physical Dimensions Height: 44 mm (1.7 in.) x Width: 440 mm (17 .3 in.) x Depth: 295 mm (11.4 in.
88 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standard s Supported SNMP SNMP protocol (RFC 1157) SNMPv2c (RFC 1901-190 7) SNMPv3 (RFCs 3 410-3418) MIB-II (RFC 1213) Bridge MIB (RFC 1493) RMON MIB II (RFC.
Switch 4400 (48-po rt) 89 Switch 4400 (48-port) Physical Dimensions Height: 44 mm (1.7 in.) x Width: 440 mm (17 .3 in.) x Depth: 274 mm (10.8 in.) Weight: 3.
90 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standard s Supported SNMP SNMP protocol (RFC 1157) SNMPv2c (RFC 1901-190 7) SNMPv3 (RFCs 3 410-3418) MIB-II (RFC 1213) Bridge MIB (RFC 1493) RMON MIB II (RFC.
Switch 4400 FX 91 Switch 4400 FX Physical Dimensions Height: 44 mm (1.7 in.) x Width: 440 mm (17 .3 in.) x Depth: 274 mm (10.8 in.) Weight: 2.8 kg (6.2 lbs) Environmental Requirements Operating Temper.
92 A PPENDIX C: T ECHNICAL S PECIFICATIONS Standard s Supported SNMP SNMP protocol (RFC 1157) SNMPv2c (RFC 1901-190 7) SNMPv3 (RFCs 3 410-3418) MIB-II (RFC 1213) Bridge MIB (RFC 1493) RMON MIB II (RFC.
D O BTAINING S UPPORT FOR YOUR P R ODUCT Register Y our Product W arr anty and other service benefits start from the date of purchase, so it is important to register your product quickly to ensure you get full use of the warranty and other service benefits available to you.
94 A PPENDIX D: O BTAINING S UPPORT FOR YOUR P RODUCT T roubleshoot Online Y ou will find support tools posted on the 3Com web site at http://www.3com.com/ 3Com Knowledgebase helps you troubleshoot 3Com products. This query-based interactive tool is located at http://knowledgebase.
Contact Us 95 T o send a pr oduct directly to 3Com for re pair , you must first obtain a return authorization number (R MA). Products sent to 3Com, without authorization numbers clearly marked on the outside of the package, will be r etur ned to the sender unopened, at the sender’ s expense.
96 A PPENDIX D: O BTAINING S UPPORT FOR YOUR P RODUCT Austria Belgium Denmark Finland France Germany Hungary Ireland Israel Italy 01 7956 7124 070 700 770 7010 7289 01080 2783 0825 809 622 01805 404 747 06800 12813 1407 3387 1800 945 3794 199 161346 Luxembourg Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U.
I NDEX 97 I NDEX Numbers 3C number 2 6 A access levels of default us ers 54 automatic setup 44 3Com Network Supervisor 44 console port 44 B browsers choosing 51 C cable choosing the correct 31 pin-out.
98 I NDEX IP addressing 59 LEDs 58 product name 26 R rack mounting a Swi tch 4400 25 Redundant Power System. See RPS related documentation 9 RPS 19 connecting 30 socket 19 S safety information English 66 Fren ch 68 German 70, 72 Italian 75 serial number of the Switch 26 serial port.
R EGULATORY N OTICES FCC S TATEMENT This equipment has been tested and found to comply wi th the limits for a Class A digital device, pursuan t to part 15 of the FCC rules. These limits are designed to provide reasonab le protection against harmful interference when the equipment is operated in a co mmercial environment.
DUA1720-3AAA09.book Page 100 Wed nesday, July 6, 2005 4:33 PM.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il 3Com SuperStack 3 3C17204 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del 3Com SuperStack 3 3C17204 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com SuperStack 3 3C17204 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com SuperStack 3 3C17204 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com SuperStack 3 3C17204, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del 3Com SuperStack 3 3C17204.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com SuperStack 3 3C17204. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com SuperStack 3 3C17204 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
