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Baseline 2226 plus factory reset

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Baseline Switch 2226-SFP Plus Baseline Switch 2426-PWR Plus Baseline Switch 2250-SFP Plus Installation and User Guide Installations- und Bedienungsanleitung 3CBLSF26 3CBLSF26PWR 3CBLSF50 www.3Com.com Part No. 10016622 Published May 2008

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CONTENTS Supplying Power to the Switch 20 ABOUT THIS GUIDE Checking for Correct Operation 21 Conventions 7 Using SFP Tranceivers 22 Documentation Comments 8 Approved SFP Transceivers 22 Product Registration 8 Inserting an SFP Transceiver 22 Removing an SFP Transceiver 23 1 INTRODUCING THE BASELINE SWITCH Performing Spot Checks 23 Overview of the Baseline Switch 9 Features and Capabilities 9 3 CONNECTING TO THE WEB INTERFACE Autosensing of MDI/MDIX Connections 9 Requirements for Accessing the Web Interface 25 Autonegotiating 10/100 Mbps Ports 9 Using the Console Command Line Interface (CLI) 25 Power-over-Ethernet Capability 10 Logging On to the Web Interface 27 Gigabit Combo Ports (RJ-45/SFP) 10 Navigating the Web Interface 28 Physical Features 10 Menu 28 Front Panel 11 Buttons 31 Rear Panel 15 Port Status 31 Package Contents 16 Accessing the Switch using the 3Com Switch Detect Application 31 2 INSTALLING THE SWITCH Running the 3Com Switch Detect Application 32 Important Safety Information 17 Positioning the Switch 18 4 CONFIGURING THE SWITCH FROM THE WEB INTERFACE Rack-Mounting or Free-Standing 19 Configuration Overview 35 Using the Mounting Kit 19 Device Summary Information 35 Montagesatz Anweisungen 20 Administration Settings 37 Placing Units On Top of Each Other 20 Modifying the IP Address Settings 37

Automatic IP Configuration 37 5 TROUBLESHOOTING IP Setup 38 Resetting to Factory Defaults 75 Backup Configuration 38 Forgotten Static IP Address 76 Restore Configuration 39 Solving LED Issues 76 Firmware Upgrade 39 If the Problem Persists 77 Reset 40 System Access 40 System Name 43 A OBTAINING SUPPORT FOR YOUR PRODUCT System Time 43 Register Your Product 79 SNMP 43 Purchase Value-Added Services 79 Configuring VLANs 44 Troubleshoot Online 79 VLAN 45 Access Software Downloads 79 Forwarding Tagged/Untagged Frames 49 Telephone Technical Support and Repair 80 Sample VLAN Configurations 49 Contact Us 80 Spanning Tree 51 IGMP Snooping & Query 54 Broadcast Storm 55 B TECHNICAL INFORMATION QoS VoIP Traffic Settings 56 3CBLSF26 Related Standards 83 PoE (3CBLSF26-PWR only) 59 Environmental 83 Configuring Port Settings 60 Physical 83 Administration 60 Electrical 83 Link Aggregation 63 3CBLSF26PWR Related Standards 84 Statistics 66 Environmental 84 Security 66 Physical 84 RADIUS Client 66 Electrical 84 802.1X Settings 67 3CBLSF50 Related Standards 85 Monitoring 69 Environmental 85 Address Table 69 Physical 85 Port Mirroring 70 Electrical 85 Cable Diagnostics 72 C PIN-OUTS Console Cable 87 Null Modem Cable 88

PC-AT Serial Cable 88 Modem Cable 88 Ethernet Port RJ-45 Pin Assignments 89 D 3COM CLI REFERENCE GUIDE Getting Started with the Command Line Interface 91 Console Port 91 Logging on to the CLI 91 Automatic Logout 92 Concurrent CLI Sessions 92 CLI Commands 92 ?93 Ping 94 Summary 94 ipSetup 95 Upgrade 96 Initialize 97 Reboot 97 Logout 98 Password 98 REGULATORY NOTICES GLOSSARY INDEX

ABOUT T HIS G UIDE This guide describes how to install your 3Com Switch If release notes are shipped with your product and the and perform initial management configurations. It information there differs from the information in this covers the following switches: guide, follow the instructions in the release notes. Baseline Switch 2226-SFP Plus (3CBLSF26) Most user guides and release notes are available in Baseline Switch 2426-PWR Plus (3CBLSF26PWR) Adobe Acrobat Reader Portable Document Format (PDF) Baseline Switch 2250-SFP Plus (3CBLSF50) or HTML on the 3Com World Wide Web site: Unless noted otherwise, the features, specifications and www.3Com.com procedures described hereafter are shared by all the switch models covered in this guide. Device drawings, screen captures and command line interface examples Conventions are based on the 3CBLSF26PWR model. Where features Table 1 and Table 2 list conventions that are used vary significantly between the switches, examples are throughout this guide. provided for each. Table 1 Notice Icons This guide is intended for use by those responsible for Icon Notice Type Description installing and setting up network equipment; consequently, it assumes a basic working knowledge of Information note Information that describes important features or instructions LANs (Local Area Networks). Caution Information that alerts you to Diese Anleitung ist für die Benutzung durch potential loss of data or potential Netzwerkadministratoren vorgesehen, die für die damage to an application, system, or device Installation und Einstellung von Netzwerkkomponenten verantwortlich sind; Erfahrung bei der Arbeit mit LANs Warning Information that alerts you to potential personal injury (Local Area Networks) ist vorausgesetzt.

8 ABOUT THIS GUIDE Table 2 Text Conventions Please include the following information when contacting us: Convention Description Document title ■ The words “enter” When you see the word “enter” in this and “type” guide, you must type something, and then ■ Document part number (on the title page) press Return or Enter. Do not press Return or Enter when an instruction simply says ■ Page number (if appropriate) “type.” Keyboard key names If you must press two or more keys Example: simultaneously, the key names are linked with a plus sign (+). Example: ■ Baseline Switch 2426-PWR Plus User Guide Press Ctrl+Alt+Del ■ Part number: 10016622 Words in italics Italics are used to: Page 25 ■ ■ Emphasize a point. ■ Denote a new term at the place where it Please note that we can only respond to comments and is defined in the text. questions about 3Com product documentation at this ■ Identify menu names, menu commands, e-mail address. Questions related to technical support or and software button names. Examples: sales should be directed in the first instance to your From the Help menu, select Contents. network supplier. Click OK. Product Registration Documentation Comments You can now register your Baseline Switch on the 3Com Your suggestions are very important to us. They will Web site to receive up-to-date information on your help make our documentation more useful to you. product: Please e-mail comments about this document to 3Com at: http://esupport.3Com.com pddtechpubs_comments@3Com.com

1 INTRODUCING THE B ASELINE S WITCH This chapter provides an overview of the features and capabilities of the 3Com Baseline Switch 2226-SFP Plus, Features and Capabilities 3Com Baseline Switch 2426-PWR Plus, and 3Com The Switch has 24 or 48 shielded RJ-45, 10/100 Mbps Baseline Switch 2250-SFP Plus. It also identifies the contents of the Switch package and helps you get to auto-negotiating ports and 2 Gigabit combo ports (comprised of a RJ-45 port and a Small Form Factor know the physical features of the device. Pluggable (SFP) transceiver slot) on the front panel for easy, flexible connection to fiber-based Gigabit media. A Overview of the Baseline Switch console port is also provided on the front panel to enable out-of-band configuration. ® The 3Com Baseline Switch 2226-SFP Plus is a versatile, easy-to-use configurable switch. Autosensing of MDI/MDIX Connections ® The 3Com Baseline Switch 2426-PWR Plus is a All ports on the Switch can autosense both medium versatile, easy-to-use configurable Power-over-Ethernet dependent interface (MDI) and medium dependent (PoE) Switch. interface crossover (MDIX) connections. This allows you ® The 3Com Baseline Switch 2250-SFP Plus is a versatile, to connect network devices to each port using either a easy-to-use configurable switch. normal straight-through TP (twisted pair) cable or a ‘crossover’ TP cable. Each Switch is ideal for users who want the high-speed performance of 10/100 switching with the added Any port can therefore be used to connect to another functionality of Gigabit copper and fiber links, but do switch port, server, or workstation without additional not need sophisticated management capabilities. The configuration. Switch is shipped ready for use. No configuration is Autonegotiating 10/100 Mbps Ports necessary. Each 10/100 Mbps port automatically determines the speed and duplex mode of the connected equipment and provides a suitable switched connection. The

10 INTRODUCING THE BASELINE SWITCH 10/100 Mbps ports can operate in either half-duplex or full-duplex mode. Physical Features Power-over-Ethernet Capability Figures 1, 2, and 3 show the front and rear panels of the Switch. The numbers in these diagrams refer to The Switch 2426-PWR Plus (3CBLSF26PWR) provides 24 numbered sections in “Front Panel” on page 11 and front panel RJ-45 ports that support the IEEE 802.3af “Rear Panel” on page 15. Power-over-Ethernet (PoE) standard. Any 802.3af compliant device attached to a port can directly draw power from the Switch over the Ethernet cable without Figure 1 3CBLSF26 Front and Rear Panels requiring its own separate power source. This capability gives network administrators centralized power control for devices such as IP phones and wireless access points, which translates into greater network availability. The Switch also supports a pre-standard implementation of 802.3at, delivering up to 29.6 W per port (measured at the PD, assuming 100 m Cat 5E cable connected between the PD and the Switch 2426-PWR), subject to the maximum power budget available. Figure 2 3CBLSF26PWR Front and Rear Panels Gigabit Combo Ports (RJ-45/SFP) The 2 Gigabit combo ports support fiber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This offers the flexibility of using SFP transceivers to provide connectivity between the Switch and a 1000 Mbps core network. When an SFP port is in operation, the corresponding 1000BASE-T port is disabled. The 1000 Mbps connections can only operate in full duplex mode.

Physical Features 11 Figure 3 3CBLSF50 Front and Rear Panels téléphonique central privé ou public. Raccorder seulement connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou téléphones de réseaux à ces prises. Il est possible de raccorder des câbles protégés ou non protégés avec des jacks protégés ou non protégés à ces prises de données. WARNHINWEIS: RJ-45-Porte. Diese Porte sind geschützte Datensteckdosen. Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für die Front Panel Verbindung der Einheit mit einem traditionellem privatem oder öffentlichem Telefonnetzwerk gebraucht The front panel of the Switch contains a series of werden. Nur RJ-45-Datenanscluße, Telefonnetzsysteme indicator lights (LEDs) that help describe the state of or Netztelefone an diese Steckdosen anschließen. various networking and connection operations. Entweder geschützte oder ungeschützte Buchsen dürfen (1) RJ-45 10/100 Ports an diese Datensteckdosen angeschlossen werden. WARNING: RJ-45 Ports. These are shielded RJ-45 data The Switch has 24 or 48 10/100 Mbps auto-negotiating sockets. They cannot be used as standard traditional ports. Each port supports automatic MDI/MDI-X telephone sockets, or to connect the unit to a detection and can be connected to either a 10BASE-T, traditional PBX or public telephone network. Only or 100BASE-TX device. connect RJ-45 data connectors, network telephony For each port, the speed and duplex mode (half duplex systems, or network telephones to these sockets. or full duplex for 10BASE-T and 100BASE-TX) are Either shielded or unshielded data cables with shielded automatically determined by the capabilities of the or unshielded jacks can be connected to these data connected device. sockets. The 3CBLSF26PWR Switch also supports IEEE AVERTISSEMENT: Points d’accès RJ-45. Ceux-ci sont 802.3af-2003 standard (802.3af) and pre-standard protégés par des prises de données. Ils ne peuvent pas être utilisés comme prises de téléphone conventionnelles P802.3at DTE Power via MDI Enhancements (PoE+). Each port can detect connected 802.3af/at-compliant standard, ni pour la connection de l’unité à un réseau

12 INTRODUCING THE BASELINE SWITCH network devices, such as IP phones or wireless access (3) Console Port points, and automatically supply the required DC power, up to a maximum of 29.6 W measured at the PD, The console port allows out-of-band access to the assuming 100 m Cat 5E cable connected between the Switch’s built-in Command Line Interface (CLI) that you PD and the Switch 2426-PWR, subject to power being can use to reset the Switch to factory defaults, change available from the overall power budget. the IP address that is assigned to the Switch, set the admin password, reboot the Switch, or upgrade the (2) Gigabit Combo Ports (RJ-45/SFP) Switch firmware via TFTP. The Gigabit combo ports (RJ-45/Small Form Factor To connect to the Console Port, you need the following: Pluggable (SFP) ports) are numbered 25 and 26 on 3CBLSF26 and 3CBLSF26PWR, 49 and 50 on 3CBLSF50. ■ The console cable provided in the Switch package, If the link connection on the SFP port is active, the connected to the console port of the Switch, and to associated RJ-45 port of the same number is disabled. an available serial (com) port on your computer The two SFP ports support fiber Gigabit Ethernet ■ A terminal emulation application capable of VT100 short-wave (SX – 3CSFP91) and long-wave (LX – emulation, installed on your computer 3CSFP92) SFP transceivers in any combination. This ■ Configure the com port connection parameters in offers you the flexibility of using SFP transceivers to your terminal emulator as follows: provide connectivity between the Switch and remote Com port: Choose based on the computer serial 1000 Mbps workgroups or to create a high-capacity ■ port to which the console cable is attached (often aggregated link backbone connection. The default active COM1) port is the SFP port. The selection of active ports can be configured via the Web interface. ■ Speed (baud): 38400 Data bits: 8 ■ The SFP port supports full duplex mode only. Stop bits: 1 ■ SFP ports are numbered 25 and 26 on 3CBLSF26 and Parity: None 3CBLSF26PWR, 49 and 50 on 3CBLSF50. When an SFP ■ port is active it has priority over the 10/100/1000 port ■ Flow Control: None of the same number. The corresponding 10/100/1000 port is disabled when an SFP link connection is active.

Physical Features 13 (4) 10/100BASE-TX Link/Activity Status LEDs (5) 10/100BASE-TX Duplex Status LEDs The top row (3CBLSF50) and the first (top) and third (3CBLSF26 and 3CBLSF26PWR Only) rows (3CBLSF26/3CBLSF26PWR) of LEDs, which are The second and fourth row of LEDs, which are colored colored yellow or green, show the link, activity and yellow, show the duplex status of the related ports: speed status of the related ports: Table 2 10/100BASE-TX Duplex Status LEDs Table 1 10/100BASE-TX Link/Activity Status LEDs Status Meaning Status Meaning Yellow The link is operating in full duplex mode. Green The link is operating at 100 Mbps. Off The link is operating in half duplex mode. Yellow The link is operating at 10 Mbps. ■ The duplex status of the ports on 3CBLSF50 (and 3CBLSF26/3CBLSF26PWR) can also be Flashing Packets are being received or transmitted on the monitored from the user interface. Sport psychology for coaches ebook library. Green port at 100 Mbps. Flashing Packets are being received or transmitted on the (6) Gigabit Combo Port and Duplex Status LEDs Yellow port at 10 Mbps. Each Gigabit combo port has two status LEDs which Off The link has not been established, nothing is indicate functions dependant upon whether a connected to the port, or there is a problem: connection has been made to the fixed 1000BASE-T ■ Check that the attached device is powered port, or if an SFP Module has been inserted. on. ■ Check that the cable is the correct type, is not faulty, and is inserted correctly. If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your supplier for further advice.

14 INTRODUCING THE BASELINE SWITCH 1000BASE-T Mode 1000BASE-T only operates in full-duplex mode. 10/100BASE-TX can operate in half- or full-duplex Table 3 1000BASE-T Link/Activity Status LEDs mode. Link/Activity Meaning SFP Mode Green The link is operating at 1000 Mbps. Table 5 SFP Link/Activity Status LEDs Yellow The link is operating at 10 or 100 Mbps. Link/Activity Meaning Flashing Green Packets are being received or transmitted on the port at 1000 Mbps. Green The link is operating at 1000 Mbps. Flashing Yellow Packets are being received or Flashing Green Packets are being received or transmitted on the port at 10 or 100 transmitted on the port at 1000 Mbps. Mbps. Off The link has not been established; Either Off The link has not been established, nothing is connected to the port, or nothing is connected to the port, or there is a problem: there is a problem: ■ Check that the attached device is ■ Check that the attached device is powered on. powered on. ■ Check that the SFP module is inserted ■ Check that the cable is the correct correctly. type, is not faulty, and is inserted ■ Check that the fiber cable is the correctly. correct type, is not faulty, and is If these checks do not identify the cause inserted correctly. of the problem, it may be that the unit ■ Ensure that the transmit (TX) and or the device connected to the port is faulty. Contact your supplier for further receive (RX) fiber cables are not advice. swapped. TX on the remote device must be connected to RX on the local device; likewise, RX on the remote Table 4 1000BASE-T SFP/Duplex Status LEDs device must be connected to TX on the local device. SFP/Duplex Meaning If these checks do not identify the cause of the problem, it may be that the unit Yellow The link is operating at full duplex. or the device connected to the port is faulty. Contact your supplier for further Off The link is operating at half duplex, or advice. no link is established.

Physical Features 15 Table 6 SFP Mode SFP/Duplex Status LEDs Do not apply the pads if you intend to rack mount the unit. SFP/Duplex Meaning Green The SFP module is inserted, regardless of If the unit is to be part of a free-standing stack, apply the link status. the pads to each marked corner area on the underside of the unit. Place the unit on top of the lower unit, Off The SFP module is not inserted. ensuring that the pads locate within the recesses of the The SFP module will only disable the 1000BASE-T lower unit. interface once there is a valid link on the module. Rear Panel (7) Power LED The rear panel of the Switch contains the power supply socket. The Power LED shows the power status of the Switch. (9) Power Socket Table 7 Power Status LED The Switch automatically adjusts to the supply voltage. Status Meaning Only use the power cord that is supplied with the unit. Green The unit is powered on and ready for use. Yellow Internal power, POST, or loopback test has failed. Switch is in fail-safe mode. Flashing The Switch is undergoing the power up sequence, or a software upgrade is underway. Off The unit is not receiving power. ■ Check that the power cord is connected correctly. ■ If the unit still does not operate, contact your supplier. (8) Self-adhesive Pads The unit is supplied with four self-adhesive rubber pads.

16 INTRODUCING THE BASELINE SWITCH Package Contents Before installing and using the Switch, verify that your Switch package is complete. The Switch comes with: ■ One power cord ■ One console cable ■ Four standard height, self-adhesive rubber pads ■ One mounting kit (part number 123193-104) ■ Installation CD ■ This User Guide ■ Warranty flyer The Switch is powered from the AC supply. If any of the above items are damaged or missing, contact your 3Com network supplier immediately.

2 INSTALLING THE S WITCH This chapter contains information that you need to Information (Translation for this would be: Informações install and set up the Switch. It covers the following de Segurança e Regulatórias da Famila de Switches topics: 3Com) incluido no produto. Este manual pode ser Important Safety Information encontrado no CD-ROM incluido com o seu switch ou no site da 3Com: www.3Com.com ■ Positioning the Switch ■ Rack-Mounting or Free-Standing Viktig säkerhets information ■ Vänligen hänför till säkerhets informationen som är Supplying Power to the Switch ■ inkluderad med denna produkt i 3Com Switch Family Using SFP Tranceivers Safety and Regulatory Information manualen. Du kan ■ hitta denna manual på den CD-ROM som följde med Performing Spot Checks din switch. Du kan även ladda ner denna från 3Com ■ hemsidan: www.3Com.com Important Safety Information Importantes informations de securité Please refer to the safety information found in the Veuillez consulter les informations de securité qui se 3Com Switch Family Safety and Regulatory Information trouvent dans le manuel suivant 3Com Switch Family manual included with this product. You can find the Safety and Regulatory Information celui-ci est inclu avec 3Com Switch Family Safety and Regulatory Information le produit. Vous pouvez trouver ce manuel sur le manual on the product CD-ROM that was included with CD-ROM qui a été livré avec votre switch. Vous pouvez your switch. You can also download the safety manual aussi le télécharger sur le site Web de 3Com à: from the 3Com Web site: www.3Com.com www.3Com.com Informações Importantes de Segurança Wichtige Sicherheits Informationen Por favor, antes de manusear o produto, leia Bitte wenden Sie sich an die Sicherheitsinformationen in cuidadosamente as instruções de segurança encontradas der 3Com Switch Family Safety and Regulatory no Manual 3Com Switch Family Safety and Regulatory Information Anleitung die mit diesem Produkt

18 INSTALLING THE SWITCH vorhanden ist. Sie können diese Sicherheitsanleitung auf der CD-ROM finden die im Lieferumfang Ihres Positioning the Switch Netzwerkschalters enthalten ist. Sie können die The Switch is suitable for use in an office environment Anleitungsdatei auch von der 3Com Webseite: www.3Com.com herunterladen. where it can be free-standing or mounted in a standard 19-inch equipment rack. Importante Avviso di Sicurezza Vi preghiamo di leggere attentamente e seguire le Alternatively, the Switch can be rack-mounted in a wiring closet or equipment room. A mounting kit, istruzioni indicate nel manuale di sicurezza '3Com Switch Family Safety and Regulatory Information', che containing two mounting brackets and four screws, is supplied with the Switch. troverete incluso a questo prodotto. Puó trovare il suddetto manuale nel CD-ROM allegato al Vostro When deciding where to position the Switch, ensure Switch. Potete anche scaricarlo dal nostro sito: that: www.3Com.com ■ It is accessible and cables can be connected easily. Information importante de seguridad ■ Cabling is away from sources of electrical noise. Le rogamos lea y siga atentamente las instrucciones These include lift shafts, microwave ovens, and air indicadas en el manual de seguridad del 3Com Switch conditioning units. Electromagnetic fields can Family Safety and Regulatory Information, incluido en interfere with the signals on copper cabling and este producto. Puede encontrar el manual en el introduce errors, therefore slowing down your CD-ROM adjunto a su switch.Alternativamente lo puede network. bajar de la web de 3Com: www.3Com.com ■ Water or moisture cannot enter the case of the unit. Istotne informacje dot. bezpieczeństwa ■ Air flow around the unit and through the vents on Informacje dotyczące bezpieczeństwa są umieszczone the side of the case is not restricted (3Com w Instrukcji obsługi 3Com Switch Family, która jest do recommends that you provide a minimum of 25 mm łączona do tego produktu. Wraz z prze łącznikiem (1 in.) clearance). znajduje sie instrukcja na płycie CD-ROM. Istnieje ■ The air is as free from dust as possible. także możliwość pobrania instrukcji bezpośrednio ze strony internetowej www.3Com.com ■ Temperature operating limits are not likely to be exceeded. It is recommended that the unit is installed in a clean, air conditioned environment.

Rack-Mounting or Free-Standing 19 It is always good practice to wear an anti-static wrist To rack-mount the Switch: strap when installing network equipment, connected to 1 Place the unit the right way up on a hard, flat surface a ground point. If one is not available, try to keep in with the front facing towards you. contact with a grounded rack and avoid touching the unit's ports and connectors, if possible. Static discharge 2 Locate a mounting bracket over the mounting holes on can cause reliability problems in your equipment. one side of the unit. 3 Insert the two screws supplied in the mounting kit and fully tighten with a suitable screwdriver. Rack-Mounting or Free-Standing The unit can be mounted in a 19-inch equipment rack Figure 4 Rack Mounting the Unit using the mounting kit, or it can be free standing. Do not place objects on top of the unit or stack. CAUTION: If installing the Switch in a free-standing stack of different size Baseline or Superstack 3 units, the smaller units must be installed above the larger ones. Do not have a free-standing stack of more than six units. Using the Mounting Kit The Switch is supplied with two mounting brackets and four screws. These are used for rack mounting the unit. When mounting the unit, you should take note of the guidelines given in “Positioning the Switch” on page 18. The Switch is 1U (1.7 inches) high and will fit in a standard 19-inch rack. 4 Repeat steps 2 and 3 for the other side of the unit. CAUTION: Disconnect all cables from the unit before 5 Insert the unit into the 19-inch rack and secure with continuing. Remove the self-adhesive pads from the suitable screws (not provided). underside of the unit, if already fitted. 6 Reconnect the cables.

20 INSTALLING THE SWITCH Montagesatz Anweisungen Placing Units On Top of Each Other Der Switch wird mit zwei Halterungen und vier If the Switch units are free-standing, up to six units can Schrauben geliefert. Diese werden für den Einbau in be placed one on top of the other. If you are mixing a einem Baugruppenträger benutzt. Bei der Montage der variety of Baseline and SuperStack units, the smaller Baugruppe beachten Sie die Anweisungen aus units must be positioned at the top. “Positioning the Switch” auf page 18. If you are placing Switch units one on top of the other, Der Switch ist eine Baueinheit hoch und passt in einen you must use the self-adhesive rubber pads supplied. Standard 19' (Zoll) Baugruppenträger. Apply the pads to the underside of each Switch, sticking one in the marked area at each corner. ACHTUNG: Entfernen Sie alle Kabel, bevor Sie fortsetzen. Entfernen Sie die selbstklebenden Polster Place the Switch units on top of each other, ensuring (Füße) von der Unterseite der Baugruppe, falls diese that the pads of the upper unit line up with the recesses bereits angebracht sind. of the lower unit. 1 Platzieren Sie die Baugruppe aufrecht auf einer harten, ebenen Fläche mit der Vorderseite Ihnen entgegen. Supplying Power to the Switch 2 Ordnen Sie eine der Halterungen über den Löchern an Power problems can be the cause of serious failures and der Seite der Baugruppe an. downtime in your network. Ensure that the power input 3 Stecken Sie zwei der mitgelieferten Schrauben in die to your system is clean and free from sags and surges to Löcher und drehen Sie diese mit einem geeigneten avoid unforeseen network outages. 3Com recommends Schraubendreher fest. that you install power conditioning, especially in areas prone to blackout, power dips and electrical storms. 4 Wiederholen Sie die letzten zwei Schritte auf der anderen Seite der Baugruppe. The unit is intended to be grounded. Ensure it is 5 Führen Sie die Baugruppe in den 19' (Zoll) connected to earth ground during normal use. Installing Baugruppenträger ein und sichern Sie die Baugruppe proper grounding helps to avoid damage from lightning mit geeigneten Schrauben. (Nicht im Lieferumfang and power surges. enthalten). Before powering on the Switch, verify that the network 6 Schließen Sie alle Kabel wieder an. cables and the power cable are securely connected.