Manuale d’uso / di manutenzione del prodotto GSW-2476 del fabbricante LevelOne
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LevelOne GSW-2476 24-Port Gigabit w/ 4-Port SFP Web Smart Switch User Manual V ersion 1.0-06 08.
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iii C OMPLIANCES FCC - Class A This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules . These l imits are designed to provide reasonab le protection against har mful interf erence when the equipment is operat ed in a commercial environment.
C OMPLIANCES iv CE Mark Declaration of Conf or mance for EMI and Safety (EEC) This infor mation technolog y equipment compli es with the requirements of the Council Directi ve 89/3 36/EEC on the Appro.
C OMPLIANCES v Safety Compliance W ar ning: Fiber Optic Port Safety Av er tissment: Ports pour fi bres optiques - sécurité sur le plan optique W ar nhinweis: F aser optikanschlüsse - Optische Siche.
C OMPLIANCES vi Import ant! Before making connections , make sure yo u hav e the correct cord set. Check it (read the label on the cable) against the following: Power Cord Set U.S.A. and Canada The cord set must be UL-approved and CSA certified. The minimum specifications for the flexible cord are: - No.
C OMPLIANCES vii W ar nings and Cautionar y Messa ges Environmental Statement The manufacturer of this prod uct endea vours to sustain an environme ntally- friendly policy throughout the entire producti on process .
C OMPLIANCES viii This gui de details the hardware features of th is switch, includin g Its physical and perfor mance-related characteristics , and how to install the switc h. Audience This guide is for system admini strators with a w orking knowledge of network management.
ix T ABLE OF C ONTENTS 1 About GSW-2476 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Switch Architect ure . . . . . . . .
T ABLE OF C ONTENTS x 4 Making Network Connections . . . . . . . . . . . . . . . . . . . 4-1 Connecting N etwork Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Twisted-Pair Dev ices . . . . . . . . . . . . . . . . . . . .
T ABLE OF C ONTENTS xi VLAN Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 28 QOS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 3 Security . . . . . . . . . . . . . .
T ABLE OF C ONTENTS xii.
xiii T ABLES Table 1-1 Port Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Table 1-2 Power Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Table 4-1 Maximum 1000BASE-T Gigabit Et hernet Cable Length .
xiv F IGURES Figure 1-1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Figure 1-2 R ear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Figure 1-3 Por t LEDs and Power LED . .
F IGUR ES xv Figure 5- 19 Trunk M embership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 7 Figure 5-2 0 Trunk C onfiguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 8 Figure 5-2 1 VLA N Settings . . . . . . . . . .
F IGURES xvi.
1-1 C HAPTER 1 A BOUT GSW-2476 Overview LevelOne GSW -2476 is an intelligen t Layer 2 switch with 24 10/100/ 1000B ASE-T ports, four of which are co mbination ports * that are shared with four SFP transceiv er slots (see Figure 1-1, Ports 21-24).
A BOUT GSW-2476 1-2 Switch Architecture The switch employs a wire-speed, non-blocking switching fabric . This per mits simultaneous wire-speed transport of multiple pack ets at low latency on all por ts . The switch also features full-dupl ex capability on all ports, which effecti vely doubles the bandwidth of eac h connection.
D ESCRIPTION OF H ARDWARE 1-3 Description of Hardware 10/100/1000BASE-T Ports The switch contains 24 RJ-45 ports th at operate at 10 Mbps or 100 Mbps, half or full dupl ex, or at 1000 Mbps , full du plex.
A BOUT GSW-2476 1-4 Figure 1-3 Port LEDs and Power LED Table 1-1 Port Status LEDs LED Condition Status Fast Ethernet Ports (Ports 1-24) Link/Act (Link/Activi ty) On/Flashing Green Port has establishe d a valid network connection. Flashing indicates activity .
F EATURES AND B ENEFITS 1-5 Power Supply Socket The power sock et is located on the rear panel of the switch. The standard pow er socket is for the A C power cord.
A BOUT GSW-2476 1-6 Expandability • 4 Small Form Factor Pluggable (S FP) transceiver slots (shared with 1000BASE-T ports) • Supports 1000BASE-SX, 1000BAS E-LX and 1000BASE-ZX SFP transceiv ers. Performance • Transparent bridging. • Provides store-and-forward switching • Supports Jumbo frames up to 9.
2-1 C HAPTER 2 N ETWORK P LANNING Introduction to Switching A network switc h allows simultaneous transmission of multiple pack ets via non-crossbar switching .
N ETWORK P LANNING 2-2 Application Examples GSW -2476 is not only designed to segm ent your netw ork, but also to provide a wide range of options in setting up netw ork connections.
A PPLICATION E XAMPLE S 2-3 Central Wiring Closet With 24 parallel bridging ports (i.e., 24 distinct collision domains), this switch can col lapse a complex netw ork do wn into a single efficient bridg ed node, increasin g ov erall bandwidth and throughput.
N ETWORK P LANNING 2-4 Remote Connections with Fiber Cable Fiber optic technolog y allows for longer cabling than any other media type. A 1000B ASE-SX (MMF) link can connect to a site up to 550 meters awa y , a 1000BASE-LX (SMF) link up to 10 km, and a 1000B ASE-Z X link up to 70 km.
A PPLICATION E XAMPLE S 2-5 Making VLAN Connections The switch supports VLANs that can be used to org anize any group of network nodes into separate broadcast domains . VLANs confine broadcast traffic to the originating group , and can eliminate broadcast stor ms in large networks .
N ETWORK P LANNING 2-6 Application Notes 1. Full-duplex operation only applies to point-to-point access (such as when a switch is attached to a w ork station, ser ver or another switch). When the switch is connected to a hub , both devices must o perate in half-du plex mode .
3-1 C HAPTER 3 I NSTALLING THE S WITCH Selecting a Site GSW -2476 can be mounted in a standard 19-inch equipment rack or on a flat surface. Be sure to follow the guidelines below when c hoosing a location. • The site should: - be at the center of all the devices you want to link and near a power outlet.
I NSTALLING THE S WITCH 3-2 Ethernet Cabling T o ensure proper operation when insta lling the switches into a netw ork, make sure that the cu rrent cables are suitable for 10B ASE-T , 100B ASE-TX or 1000BASE-T operation.
E QUIPMENT C HECK LIST 3-3 Equipment Checklist After unpacking GSW -2476 unit, c heck th e contents to be sure you ha ve receiv ed all the components. Then, be fore beginning the installation, be sure you ha ve all other necessary installation equipment.
I NSTALLING THE S WITCH 3-4 • Temperature: Si nce the tempera ture within a rack assembly may be higher than the ambient room temper ature, check that the rack-environment temperature is within the specified operating temperature r ange (see page C-2).
M OUNTING 3-5 T o rack-mount devices: 1. Attach the brack ets to the device using the screws pro vided in the Brack et Mounting Kit. Figure 3-2 Attaching the Brackets 2.
I NSTALLING THE S WITCH 3-6 3. If installing a single switch onl y , tur n to “Connecting to a P ower Source” at the end of this c hapter . 4. If installing multiple switches , mount them in the rack, one below the other , in any order . Desktop or Shelf Mounting 1.
I NSTALLING AN SFP T RANSCEIVER 3-7 Installing an SFP Transceiver Figure 3-5 Inserting an SFP Transceiver into a Slot The switch supports the follo wing optional transceiv ers: • 1000BASE-SX ( GVT-0300) • 1000BASE-LX ( GVT-0301 ) • 1000BASE-ZX ( GVT-0302) T o install an SFP transceiver , do the following: 1.
I NSTALLING THE S WITCH 3-8 Connecting to a Power Source T o connect a device to a powe r source: 1. Insert the power cab le plug directly into the sock et located at the back of the device. Figure 3-6 Power Socket 2. Plug the other end of the cable into a grounded, 3-pin, A C power source.
4-1 C HAPTER 4 M AKING N ETWORK C ONNECTIONS Connecting Network Devices GSW -2476 is designed to interconnect multiple segments (or collision domains). It can be connected to netw ork cards in PCs and ser vers , as well as to hubs , switches or routers .
M AKING N ETWORK C ONNECTIONS 4-2 Connecting to PCs, Servers, Hubs and Switches 1. Attach one end of a twisted-pair cable segment to the device’ s RJ-45 connector .
T WISTED -P AIR D EVIC ES 4-3 Network Wiring Connections T oday , the punch-down block is an integral part of many of the newer equipment racks . It is actually part of the patch panel. Instructions for making connections in the wiring cl oset with this type of equipment follows .
M AKING N ETWORK C ONNECTIONS 4-4 Fiber Optic SFP Devices An optional Gigabit SFP transceiv er (1 000B ASE-SX, 1000B ASE-LX or 1000B ASE-ZX) can be used for a back bone connection between switc hes, or for connecting to a high-speed ser ver .
F IBER O PTIC SFP D EVIC ES 4-5 3. Connect one end of the cable to the LC por t on the switch and the other end to the LC por t on the othe r device. Since LC connectors are keyed , the cable can be atta c hed in only one orientation. Figure 4-3 Making Connections to SFP Transceivers 4.
M AKING N ETWORK C ONNECTIONS 4-6 Connectivity Rules When adding hubs (repeaters) to your netw ork , please follow the connectivity rules listed in the manuals for these products .
C ONNECTIVITY R ULES 4-7 100 Mbps Fast Ethe rnet Collision Domain 10 Mbps Ethernet Collision Domain Table 4-3 Maximum 1000BASE-LX Fiber Optic Cable Length Fiber Diameter Fiber Bandwidth Cable Length Range Connector 9/125 micron single-m ode fiber N/A 2 m - 10km (7 ft - 6.
M AKING N ETWORK C ONNECTIONS 4-8 Cable Labeling and Connection Records When planning a network ins tallation, it is essential to label the opposing ends of cables and to record where ea c h cable is connected.
5-1 C HAPTER 5 C ONFIGURING THE S WITCH Using the Web Interface T h i s s w i t c h p r o v i d e s a n e m b e d d e d HTTP web agent. Using a web browser you can configure the switch and view statistics to mon itor network activit y .
C ONFIGURING THE S WITCH 5-2 Navigating the Web Browser Interface T o access the web-bro wser interface y ou must first ent er a passw ord. The user has read/write access to all configuration parameters and statis tics . The default password for the switch is “admin.
N AVIGATING THE W EB B RO W SE R I NTERFACE 5-3 Configuration Options Configurable parameters hav e a dial og box or a drop-down list. Once a configuration change has been made on a page, be sure to clic k on the Apply button to confir m the new settin g .
C ONFIGURING THE S WITCH 5-4 Main Menu Using the onboard web agent, you can define system pa rameters , manage and control the switc h, and all its ports, or monitor netw ork conditions . The following table brief ly describe s the selections av ailable from the web-brows er interface.
N AVIGATING THE W EB B RO W SE R I NTERFACE 5-5 PORTS 5-21 Settings Configure the speed and duplex mode of the port. 5-21 Storm Control Sets the broadcast storm control parameters. 5-23 Port Mi rroring Set s up the p ort mirroring features of the switch to enable traffic monitoring.
C ONFIGURING THE S WITCH 5-6 Web Configuration Displaying Status Overview Y ou can easily identify the system by displa ying the device name, location and contact infor mation. Field Attributes System Infor ma tion • System Name – Name assig ned to the switch system.
W EB C ONFIGURATION 5-7 • Speed/Duplex Status – Shows the current speed and duplex mode. • 10hdx : 10 Mbps half duplex. • 10fdx : 10 Mbps full duplex. • 100hdx : 100 Mbps half duplex. • 100fdx : 100 Mbps full duplex. • 1000fdx : 1000 Mbps full duplex.
C ONFIGURING THE S WITCH 5-8 We b – Click ST ATUS , Over view . Figure 5-3 Switch Information.
W EB C ONFIGURATION 5-9 Showing Port Statistics Y ou can displa y statistics on netw ork traf fic from the ports. These statistics can be used to identify potential probl ems with the switch (suc h as a faulty port or unusually heavy loading).
C ONFIGURING THE S WITCH 5-10 Received Multicast Pack ets The number of packets, delive red by this sub-layer to a higher (sub-)laye r, wh ich were addressed to a multicast address at this sub-layer.
W EB C ONFIGURATION 5-11 Undersize Fra mes The total number of fram es received that were less than 64 octets long (exc luding framing bi ts, but including FCS octets) and were otherwise well formed.
C ONFIGURING THE S WITCH 5-12 64 Bytes Frames The total number of frames (inclu ding bad packets) received and transmitted that were 64 oc tets in length (excluding framing bits but including FCS octets).
W EB C ONFIGURATION 5-13 We b – Click ST ATUS , Statistics. Figure 5-4 Port Statistics Displaying System Name Y ou can easily identify the system by displaying the device name. Field Attributes • Switch Name – Name assigned to the switch system.
C ONFIGURING THE S WITCH 5-14 We b – Click System, Name. Figure 5-5 System Name Setting the Switch’s IP Address This section describes how to config ure an IP interfa ce for manag ement access ov er the netw ork. The IP address for this switch is 192.
W EB C ONFIGURATION 5-15 Manual Configuration We b – Click System, LAN Sett ings . Enter the IP address , subnet mask and gateway , then clic k APPL Y . Note that if you c hang e the switch IP address , you mu st close the web interface and star t a new session using the new IP address.
C ONFIGURING THE S WITCH 5-16 We b – Click System, P assw ord. T o change the password for the administrator, enter current password, the new passw ord, confir m it by entering it again, then click APPLY .
W EB C ONFIGURATION 5-17 We b – Click System, T ools, R eset to Factory Defaults. Figure 5-8 Reset to Factory Defaults Upgrade Firmware T o Upg rade the switch system fir mwa re, select “Upg rade Fir mware” from the T ools drop-down list then click on the “Bro wse” button to select the fir mware fi le .
C ONFIGURING THE S WITCH 5-18 Upload/Download Configuration We b – Click SYSTEM, T ools, Upload/Download Configuration. T o upload or download the configurat ion file , select "Upload/Download .
W EB C ONFIGURATION 5-19 Restart Switch We b – Click SYSTEM, T ools, R estar t Switch. T o restar t the switch, select from the T ools drop-down list, and th en click APPL Y . T he reset will be complete when the user interf ace displa ys the login page.
C ONFIGURING THE S WITCH 5-20 We b – Click System, Static MAC . Enter the MA C address, VLAN ID , then click ADD button to add a new static MA C address . Figure 5-13 Static MAC Address Configurat ion Counter Config This pag e allows specific statistics to be selected for monitoring .
W EB C ONFIGURATION 5-21 We b – Click System, Counter Config Figure 5-14 Counter Configuration Port Configuration Y ou can use the P or t Configuration page to manually fix the speed, duplex mode, and flow control. Field Attributes • Enable Jum bo Frames – Cl ick to enable or disable Jumbo Frames.
C ONFIGURING THE S WITCH 5-22 We b – Click PORTS , Settings . Figure 5-15 Port Configuration.
W EB C ONFIGURATION 5-23 Storm Control Broadcast stor ms may occur when a device on your netw ork is malfunctioning, or if application pr ograms are not well designed or properly config ured. If there is to o m uch broadcast traffic on your network, performance can be severely degraded or everything can come to complete halt.
C ONFIGURING THE S WITCH 5-24 We b – Click PORTS , Stor m Control. Th is page enables you to set the broadcast stor m contro l parameters for ev er y port on the switch. Figure 5-16 Port Broadcast Control Port Mirroring Y ou can mirror traffic from any source port to a target por t for real-time analysis .
W EB C ONFIGURATION 5-25 switch, whic h means they will not reach the mirror port or their intended destination port. Input ra te-li miting in conjunction with port f low-control should be used to ensure that t he total ingress bandwidth never ex ceeds the eg ress bandwidth.
C ONFIGURING THE S WITCH 5-26 • Cable Status – Shows the cable length, opera ting conditions and iso lates a variety of common faults that can occur on Category 5 twisted pair cabling.
W EB C ONFIGURATION 5-27 • Trunk T1-T8 – These columns correspond to the eight trunks that are supported by the switch. To assign a port to a trun k, click on the radio button in the corresponding column, then click APPLY. We b – Click TRUNKS , Membership .
C ONFIGURING THE S WITCH 5-28 •F l o w C o n t r o l – Allows flow control to be enabled or disabled. When the box is checked, flow control is enabled.
W EB C ONFIGURATION 5-29 • The switch management interfac e is on VLAN 1 (this cannot be changed) • All ports have a Port VLAN ID (PVID) of 1 • All ports can send and receive both VLAN-tagged an.
C ONFIGURING THE S WITCH 5-30 For QinQ operation, a cu stomer port should be se t to V LAN un aware and a provider port (trunk port) should be set to VLAN aware. •Q i n Q – A QinQ enabled port will acce pt packets up to 1526 bytes in length, which means double tag he ader frames can be accepted.
W EB C ONFIGURATION 5-31 We b – Click VLANS , VL AN Settings . Fill in the required settings for each interface, click Apply . Figure 5-21 VLAN Settings VLAN Memembership Y ou can create up to 255 VLANs ba sed on 802.1Q standard and delete VLANs (Virtual LANs) to change the VLAN membership and behaviour of individual ports .
C ONFIGURING THE S WITCH 5-32 We b – Click VLANS , VLAN Membership . T o add a new , type into the VLAN ID (1-4095) of the VLAN g roup you w ant the new g roup to be, then click Add to open up the 802.1Q VLAN Group window , on which you can configure VLAN membership .
W EB C ONFIGURATION 5-33 QOS Settings QoS (Quality of Ser vice) is a mechanism that is used to prioritize cert ain traffic as it is forwa rd through the swit ch. T raffic can be classified as High or N o r m al p r i or i t y a nd , w h en t h e s w it ch is heavily loaded, it is the Nor mal priority packets that are dropp ed fi rst.
C ONFIGURING THE S WITCH 5-34 The Different iated Ser vic es Code P oint (DSCP) is a six-bit field that is contained within an IP (TCP or UDP) header .
W EB C ONFIGURATION 5-35 specified addresses . If anyone tries to access a management interface on the switch from an inv alid address, the switc h will reject the connection. Note: Inv alid frames will not be able to access manage ment interface, but nor mal forwarding is not impacted.
C ONFIGURING THE S WITCH 5-36 IGMP Snoop The switch can use Internet Group Mana gement Protocol (IGMP) to filter multicast traffic . IGMP Snooping moni tors IGMP ser vice requests passing between m ulticast clients and ser vers , and dynamically configures the ports which need to recieve the m ulitcast traffic.
W EB C ONFIGURATION 5-37 We b – Click IGMP Snoop , Settings . Figure 5-26 IGMP Sn ooping Configuration IGMP Status Show the IGMP Snooping statistics for the whole switch Field Attributes • VLAN ID - VLAN ID number. • Querier - Show whether Quer ying is enabled.
C ONFIGURING THE S WITCH 5-38 We b – Click IGMP Snoop , Status . Figure 5-27 IGMP Snoop Status.
A-1 A PPENDIX A T ROUBLESHOOTING Diagnosing Switch Indicators Table A-1 Troubleshooting Chart Symptom Action Power LED is Off • Check connections between the swit ch, the power cord, and the wall outlet. • Contact your dealer for assistance. • Contact LevelOne Technical Support .
T R OUBLESHOOTING A-2 Power and Cooling Problems If the powe r indicator does not turn on when the power cord is plug g ed in, you ma y have a pro blem with the pow er outlet, powe r cord, or internal pow er supply .
R ESET THE S WITCH A-3 Reset the Switch As situation requires, you might want to reset the switch and to restor e to the default settings . T o reset the switch: 1. Unplug the pow er cord from the pow er socket. 2. Unplug all cables from the por ts . 3.
T R OUBLESHOOTING A-4.
B-1 A PPENDI X B C ABLES Twisted-Pair Cable and Pin Assignments F or 10BASE-T/100B ASE-TX connections, a twisted-pair cable must hav e two pairs of wires . F or 1000BASE-T connections the twisted-pair cable must ha ve four pairs of wires . Each wi re pair is identified by two different colors .
C ABLES B-2 10BASE-T/100BASE-TX Pin Assignments Use unshielded twisted-pair (UTP ) or shielded twiste d-pair (STP) ca ble for RJ-45 connections: 100-ohm Categ or y 3 or better cable for 10 Mbps connections , or 100-ohm Categ or y 5 or better cable for 100 Mbps connections .
T WISTED -P AIR C ABLE AND P IN A SSIGNMENTS B-3 Straight-Through Wiring If the twisted-pair cable is to join tw o por ts and only one of the ports has an internal crossover (MDI-X), the tw o pairs of wires must be straight-through.
C ABLES B-4 Crossover Wiring If the twisted-pair cable is to join two ports and either both ports are labeled with an “X” (indicatin g MDI-X) or neither port is labeled with an “X” (which indicates MDI), a crosso ver must be implemented in the wiring .
T WISTED -P AIR C ABLE AND P IN A SSIGNMENTS B-5 1000BASE-T Pin Assignments All 1000B ASE-T por ts support automati c MDI/MDI-X operation, so y ou can use straight-through cables for all netw ork connections to PCs or ser vers , or to other switches or hubs .
C ABLES B-6 Note that when testing your cable inst allation, be sure to include all patc h cables between switches and end devices. Adjusting Existing Category 5 Cabling to Run 1000BASE-T If your exis.
C-1 A PPENDIX C S PECIFICATIONS Physical Characteristics Por t s 20 10/100/1000BASE-T , with auto-negotiation 4 10/100/1000BASE-T shared with 4 SFP transceiv er slots .
S PECIFICATIONS C-2 Size 44.0 x 17.1 x 4.3 cm (17.0 x 6.7 x 1.7 in.) Te m p e r a t u r e Operating: 0 to 40 °C (32 to 104 °F) Storage: -40 to 70 °C (-40 to 158 °F) Humidity Operating: 10% to 90% (non-condensing) AC Input 100 to 240 V , 50-60 Hz, 0.
S TANDARDS C-3 Softwa re Loading HTTP in-band Standards IEEE 802.3-2005 Ethernet, Fast Ethernet, Gig abit Ethernet IEEE 802.1Q Vir tual LAN IEEE 802.1X, Port-Based Ne twork Access Control, 2001 ISO/IE.
S PECIFICATIONS C-4.
Glossary-1 G LOSSARY 10BASE-T IEEE 802.3 specification for 10 M bps Ethernet over tw o pairs of Categ ory 3 or better UTP cable. 100BASE-TX IEEE 802.3u specification for 100 Mbps Fast Ethernet ov er tw o pairs of Categ ory 5 or better UTP cable. 1000BASE-LX IEEE 802.
G LOSSAR Y Glossary-2 Bandwidth The differenc e between the highest and lowest frequencies av ail able for network signals . Also synonymous with wire s peed, the ac tual speed of the data transmission along the cable . Collision A condition in which pac kets transmitte d over the cable interfere with eac h other .
G LOSSAR Y Glossary-3 Full Duplex T ransmission method that allows tw o network devices to trans mit and receive concurrently , effectiv el y do ubling the bandwidth of that link. Gigabit Ethernet A 1000 Mbps network comm unication system based on Ethernet and the CSMA/CD access method.
G LOSSAR Y Glossary-4 Layer 2 Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly to the hardware interface for networ k devices an d passes on traffic based on MA C addresses . LED Light emitting diode used for monito ring a device or netw ork condition.
G LOSSAR Y Glossary-5 Redundant Power Supply (RPS) A backup po wer supply unit that automatically tak es ov er in case the primar y power supply sh ould fail. RJ-45 Connector A connector for twisted-pair wiring . Switched Ports P or ts that are on separate c ollision domains or LAN segments .
G LOSSAR Y Glossary-6.
Index-1 Numerics 10 Mbps connectivity rules 4-7 100 Mbps connectivity rule s 4-7 1000 Mbps connectivity rule s 4-6 1000BASE-LX fiber cable lengths 4-7 1000BASE-SX fiber cable lengths 4-6 1000BASE-T pi.
I NDEX Index-2 installation connecting devices to the switch 4-2 desktop or shelf mounting 3-6 port connect ions 4-1 power requirements 3-1 problems A-2 rack mounting 3-3 site requiremen ts 3-1 wiring.
I NDEX Index-3 switch ar chitecture 1-2 switchin g, introdu ction to 2-1 T temperature within a rack 3-4 troubles hooting in-band access A-2 power and cooling prob lems A-2 switch indicators A-1 twist.
I NDEX Index-4.
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GSW-24 76 E082006-JC-R01 149 100011100H.
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 LevelOne GSW-2476 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 LevelOne GSW-2476 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso LevelOne GSW-2476 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul LevelOne GSW-2476 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il LevelOne GSW-2476, 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 LevelOne GSW-2476.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il LevelOne GSW-2476. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo LevelOne GSW-2476 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.
