Manuale d’uso / di manutenzione del prodotto SmartSTACK 100 del fabbricante Cabletron Systems
Vai alla pagina of 110
Smar tSTAC K 100 ELS100-16TX USER GUIDE PWR CPU RESET COM PORT STA TUS MODE TX ACT FDX MON RX COL 100 USR STA TUS ELS100-16TX EPIM100 EPIM100 10X 12X 14X 16X 9X 11X 13X 15X 2X 4X 6X 8x 1X 3X 5X 7X LIN.
.
i NOTICE Cabletron Systems reserves the right to mak e changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes ha ve been made.
Notice ii DOC NOTICE This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.
Notice iii CABLETRON SOFTWARE PROGRAM LICENSE 1. LICENSE . You have the right to use only the one (1) copy of the Program provided in this package subject to the terms and conditions of this License Agreement.
Notice iv DECLARATION OF CONFORMITY Application of Council Directiv e(s): 89/336/EEC 73/23/EEC Manufacturer’ s Name: Cabletron Systems, Inc. Manufacturer’ s Address: 35 Industrial Way PO Box 5005 Rochester, NH 03867 European Representativ e Name: Mr.
v CONTENTS CHAPTER 1 INTRODUCTION 1.1 ABOUT THIS MANUAL ........................................................................ 1-1 1.2 GETTING HELP ....................................................................................... 1-2 1.3 DOCUMENT CONVENTIONS .
vi Contents 3.10 DISPLAYING MIRRORING STATUS .............................................. 3-14 3.11 DEFINING AND DELETING WORKGROUPS ..............................3-16 3.12 ASSIGNING A COMMUNITY NAME ............................................. 3-18 3.
Contents vii 5.2 RESPONSES TO FAILURES AT POWER-UP ...................................... 5-3 5.3 STATUS AND ACTIVITY INDICATORS ............................................ 5-3 5.4 TROUBLESHOOTING .....................................................
viii Contents.
1-1 CHAPTER 1 INTR ODUCTION 1.1 ABOUT THIS MAN UAL This manual is for system administrators r esponsible for configuring, monitoring, and maintaining the SmartST ACK 100 ELS100-16TX. Y ou should have a familiarity with networking concepts and principles.
1-2 Introduction • Chapter 5, ELS100-16TX Diagnostics and Troubleshooting , describes the SmartST ACK 100 ELS100-16TX diagnostics and pr ovides information on troubleshooting common pr oblems. • Appendix A, Technical Specifications , pr ovides the SmartST ACK 100 ELS100-16TX specifications and basic cabling pin assignments.
Introduction 1-3 • A description of any action(s) already taken to r esolve the pr oblem (e.g., changing mode switches, r ebooting the unit, etc.) • The serial and r evision numbers of all involved Cabletron Systems pr oducts in the network • A description of your network environment (layout, cable type, etc.
1-4 Introduction The following conventions ar e also used in this document: 1.4 RELATED DOCUMENTATION The following documentation may assist the user in using this pr oduct: • Getting Started with the SmartST ACK 100 ELS100-16TX - contains the basic information for using the SmartST ACK 100 ELS100-16TX.
Introduction 1-5 1.5 OVERVIEW The SmartST ACK 100 ELS100-16TX is an intelligent Ethernet-to- Ethernet switch that is configur ed with 16 IEEE 802.3 10/100BASE-T autosensing Ethernet ports. The SmartST ACK 100 ELS100-16TX pr ovides the option of substituting RJ45 ports 15 and 16 (either or both) with two EPIM ports.
1-6 Introduction • Operates in either Half Duplex or Full Duplex modes on all ports. • Implements the Spanning T ree pr otocol (802.1d). • Configur ed with factory-set defaults for immediate plug-and- play capability (IP address is not configur ed at factory).
Introduction 1-7 The SmartST ACK ELS100-16TX goes beyond switching basics incorporating unique management featur es, including, RMON statistics and Br oadcast/multicast storm protection, pr oactive alarms, and both in-band and out-of-band SNMP management.
1-8 Introduction Access Contr ol (MAC) sub-layer of the Data Link layer . Figure 1-2 shows the OSI Refer ence Model. Figure 1-2. OSI Reference Model P or t T runking Another performance enhancing featur e of the SmartST ACK ELS100-16TX is Port T runking.
Introduction 1-9 ports allowing the switch port and an attached device to negotiate for full or half-duplex modes of operation. The SmartST ACK 100 ELS100-16TX also supports auto-negotiation as defined by IEEE 802.3u and will automatically set the port to the pr oper mode (10 Mbps, half/full duplex or , 100 Mbps half/full duplex).
1-10 Introduction Figure 1-3. T ypical Switching Application By forwar ding only packets addressed to devices on other network segments, the SmartST ACK 100 ELS100-16TX r educes unnecessary traf fic and thereby enhances the overall performance of the network.
Introduction 1-11 packets to the LAN. If ther e is a cable break or a port failur e, the network topology is automatically r econfigured by the Spanning T ree pr otocol to create an alternate path to the LAN.
1-12 Introduction Each dynamic entry includes: • An Ethernet MAC addr ess • A single port number of the LAN on which the address r esides • The age of the entry The SmartST ACK 100 ELS100-16TX stor es 8192 dynamic (learned) entries in its Bridge Address T able.
Introduction 1-13 Smar tST A CK 100 ELS100-16TX T runking The SmartST ACK 100 ELS100-16TX allows two trunk gr oups with up to eight ports each to be connected between the SmartST ACK 100 ELS100-16TX and other devices in the FastNetwork and SmartST ACK families.
1-14 Introduction Figur e 1-4 illustrates the trunking of multiple SmartST ACK 100 ELS100-16TX ports to incr ease the bandwidth. Figure 1-4. SmartST A CK 100 ELS100-16TX T runking with 100 Mbps P or t.
Introduction 1-15 Figur e 1-5 shows two Ethernet segments, A and B, that do not include a SmartST ACK 100 ELS100-16TX. Figure 1-5. Multiple Ethernet Segments Sharing 100 Mbps Band width Each host on segments A and B is limited to sharing a network bandwidth of 10 Mbps.
1-16 Introduction Figur e 1-6 shows two Ethernet segments that take advantage of the virtual workgr oup feature of the SmartST ACK 100 ELS100-16TX and the incr eased bandwidth applied to each A and B host.
Introduction 1-17 As illustrated in the pr evious diagram, virtual workgroups allow you to associate multiple ports and define a workgr oup. In reality , you ar e assigning workgroup IDs to SmartST ACK 100 ELS100-16TX ports.
1-18 Introduction 1.6.1 Command Syntax Con ventions The following conventions apply as you use LCM commands: • Pr ess the Enter key to execute a command after you type it in. •A port range is either a single port number , or a list of port numbers separated by commas or hyphens.
Introduction 1-19 1.6.2 Basic LCM Commands If you ar e going to manage the SmartST ACK 100 ELS100-16TX using LCM, you first must connect the SmartST ACK 100 ELS100-16TX to an ASCII terminal or terminal emulator . See Section 2.5, Connecting the Local Console Manager , for instructions.
1-20 Introduction ELS100-16 > help ELS100-16TX Local Console Manager help or ? this menu status [PORT-RANGE] to display unit or port status baud [BAUD-RATE] to change the console baud rate exit or .
Introduction 1-21 Erase Entering erase to erase the curr ent SmartST ACK 100 ELS100-16TX configuration r eturns all parameters to the default values. Exit or Logout Logs you out of LCM. (The exit command is functionally equivalent to the logout command.
1-22 Introduction.
2-1 CHAPTER 2 UNPAC KING AND INSTALLING Y OUR ELS100-16TX Car efully unpack the ELS100-16TX from the shipping carton and inspect it for possible damage.
2-2 Unpac king and Installing Y our ELS100-16TX Figure 2-1. ELS100-16TX Fr ont Panel PWR CPU RESET COM PORT STA TUS MODE TX ACT FDX MON RX COL 100 USR STA TUS ELS100-16TX EPIM100 EPIM100 10X 12X 14X 1.
Unpac king and Installing Y our ELS100-16TX 2-3 T able 2-1. Meaning of ELS100-16TX LEDs LED State Meaning Port Status Mode TX RX ACT COL FDX 100 MON USR On On On On On Off On Off On Blink On Indicates port is transmitting a packet. Indicates port is receiving a packet.
2-4 Unpac king and Installing Y our ELS100-16TX T able 2-2 describes the ELS100-16TX b uttons. 2.2 INSTALLING AN EPIM The ELS100-16TX pr ovides two slots for a Cabletron EPIM-100FX (Ethernet Port Interface Module). The ELS100-16TX is shipped without EPIMs.
Unpac king and Installing Y our ELS100-16TX 2-5 Figure 2-2. Installing an EPIM 10X 12X 14X 16X 9X 1 1X 13X 15X EPIM100 EPIM100 EPIM-100FX LNK EPIM-100FX LNK.
2-6 Unpac king and Installing Y our ELS100-16TX 2.3 INSTALLING THE ELS100-16TX Rac k-Mounting an ELS100-16TX T able 2-3 describes some general considerations you should be awar e of before mounting an ELS100-16TX in a rack assembly . The ELS100-16TX can be rack-mounted in a standar d 19-inch equipment cabinet.
Unpac king and Installing Y our ELS100-16TX 2-7 . Figure 2-3. Attaching Rac kmount Brac kets 2. Place the ELS100-16TX chassis in the cabinet. 3. Secur e the ELS100-16TX with the rackmount fasteners by inserting and securing a fastener thr ough each of the four slots in the rackmount brackets, as shown in Figur e 2-4.
2-8 Unpac king and Installing Y our ELS100-16TX 4. Once the ELS100-16TX is installed, plug the AC power cord into the AC power connector on the rear of the ELS100-16TX chassis. Plug the other end of the power cor d into a three- pr ong grounded outlet.
Unpac king and Installing Y our ELS100-16TX 2-9 T o connect the LCM: 1. Connect your ASCII terminal or terminal emulator to the out- of-band management RS232C port on the fr ont panel of the ELS100-16TX using the standar d RJ-45 twisted pair cable shipped with the unit.
2-10 Unpac king and Installing Y our ELS100-16TX 2.6.1 Connecting UTP Cables Befor e connecting a segment to the ELS100-16TX, check each end of the segment to verify wir e crossover .
Unpac king and Installing Y our ELS100-16TX 2-11 b. Verify that the RJ45 connectors on the twisted pair segment have the proper pinouts (Figure 2-6) and check the cable for continuity. Figure 2-6. Cable Pinouts - (RJ45) Cr ossover Cable c. Check that the twisted pair connection meets the dB loss and cable specifications.
2-12 Unpac king and Installing Y our ELS100-16TX Fiber Optic Netw ork Connection 1. Remove the pr otective plastic covers from the fiber optic ports on the applicable port on the module and fr om the ends of the connectors. 2. Insert one end of the SC connector into the EPIM-100FX installed in the ELS100-16TX.
Unpac king and Installing Y our ELS100-16TX 2-13 Figure 2-7. EPIM-100FX P or t 4. V erify that a Link exists by checking that the port LINK LED is solid gr een. If the LINK LED is off, perform the following steps until it is on: a. Check that the power is turned on for the device at the other end of the Link.
2-14 Unpac king and Installing Y our ELS100-16TX.
3-1 CHAPTER 3 CONFIGURING Y OUR ELS100-16TX The ELS100-16TX does not r equire any additional configuration to operate as a standar d, transpar ent switch.
3-2 Configuring Y our ELS100-16TX The following sections describe how to configur e the optional parameters of the ELS100-16TX using LCM commands, including: • Assigning IP addresses • Enabling .
Configuring Y our ELS100-16TX 3-3 • Class B addresses ar e used for medium sized networks. The first two bytes identify the network and the last two identify the node. The first byte of a class B addr ess must be in the range 128–191. The addr ess 128.
3-4 Configuring Y our ELS100-16TX 3.1.1 Displa ying IP Addresses T o display IP addr esses, subnet masks, and MAC addresses of all ports on the ELS100-16TX you ar e configuring, at the LCM prompt: 1. T ype ipaddr LCM displays the curr ent IP addr ess table, for example: 3.
Configuring Y our ELS100-16TX 3-5 T o change the subnet mask, at the LCM prompt: 1. T ype ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK> For example, ipaddr 6 192.138.217.40 255.255.240.0 would set the subnet mask for port 6 to 255.
3-6 Configuring Y our ELS100-16TX Using LCM to enable bridging for a port or port range, at the LCM pr ompt: 1. T ype bridge [PORT-RANGE [{off|on|noBPDU}]] For example, bridge 2 on would enable bridging on port 2. LCM r esponds: 3.3 DISABLING BRIDGING T o turn off the bridging function for a port or port range, at the LCM pr ompt: 1.
Configuring Y our ELS100-16TX 3-7 Y ou could also type bridge [PORT-RANGE] to look at a specific range of ports. For example bridge 2-4 would display bridging functions for ports 2, 3, and 4.
3-8 Configuring Y our ELS100-16TX Figure 3-1. T runk Connections T runk Groups Each set of connections between two ELS100-16TXs is called a T runk Group . Y ou can create up to eight tr unk gr oups, each with up to eight ports, to inter connect your ELS100-16TXs.
Configuring Y our ELS100-16TX 3-9 Figure 3-2. T runk Groups T o enable trunking for the example shown, perform the following: 1. Connect the desir ed ports of the ELS100-16TXs together using 100BASE-T cr ossover cables. If ELS100-16TX A is handling only a small number of users, the A to B T r unk Group could have just two ports per ELS100- 16TX.
3-10 Configuring Y our ELS100-16TX For ELS100-16TX B, at the LCM pr ompt: b. Type trunk 3-10,14-15 on For ELS100-16TX C, at the LCM pr ompt: c. Type trunk 3-10 on Each ELS100-16TX determines which ports ar e part of which T runk Gr oup. After T runk Gr oup configuration, the ELS100- 16TXs complete the standar d 802.
Configuring Y our ELS100-16TX 3-11 3.7 DISPLA YING T RUNKING STATUS T o check the status of your current tr unking configuration, at the LCM pr ompt: 1. T ype trunk <PORT-RANGE> The display could look like the following: Note: IP Addresses are not required for trunking to function.
3-12 Configuring Y our ELS100-16TX The display could look like the following: The following conditions can be displayed: • Br oken — T runking is enabled, but the port in non-operational. • Closed (or Oneway) — T runking is enabled, and the T runking Pr otocol is attempting to establish a trunk connection.
Configuring Y our ELS100-16TX 3-13 • Perturbed — T runking is enabled, and a good trunk connection has been established. However , the forwar ding of data packets is temporarily suspended to allow for a change in the membership of the T runk Gr oup.
3-14 Configuring Y our ELS100-16TX 3.10 DISPLA YING MIRR ORING STATUS T o check the status of your current mirr oring configuration, at the LCM pr ompt: 1.
Configuring Y our ELS100-16TX 3-15 T o check the status for ports configured for mirr oring: 1. T ype status <PORT> The display could look like the following: The following conditions can be displayed: • Rx only — mirr oring is enabled, but mirroring only packets r eceived by the port.
3-16 Configuring Y our ELS100-16TX 3.11 DEFINING AND DELETING W ORKGROUPS The ELS100-16TX allows you to define logical gr oups of associated ports (virtual workgr oups) to provide a mor e efficient flow of traf fic across your Ethernet network.
Configuring Y our ELS100-16TX 3-17 The LCM commands used to cr eate the pr evious configuration are as follows: 1. T o create workgr oup A on ports 3, 4, 5, 13, and 16: ESL10-26 > workgroup A 3-5,13,16 LCM r esponds with the following display: Name: a Ports: 3, 4, 5, 13, 16 Info: All 2.
3-18 Configuring Y our ELS100-16TX T o display information about a specific workgroup, at the LCM pr ompt: 1. T ype workgroup NAME T o create or modify a workgr oup, at the LCM prompt: 1. T ype workgroup NAME PORT-RANGE INFO T o delete a workgroup, at the LCM pr ompt: 1.
Configuring Y our ELS100-16TX 3-19 5. LCM pr ompts you to verify the new community name by r etyping it. 6. Retype the new community name. 3.13 CONFIGURING BR OADCAST/MULTICAST STORM PR OTECTION The ELS100-16TX pr ovides automatic protection against br oadcast/multicast storms.
3-20 Configuring Y our ELS100-16TX The two Management Information Base (MIB) variables for configuring multicast storm pr otection are: • kxifTxStormCnt – specifies the maximum number of multicasts that can be br oadcast within the given time.
Configuring Y our ELS100-16TX 3-21 3.16 SYSTEM NAME The system name is a name assigned to the ELS100-16TX by the network administrator . By convention, the system name is the fully qualified domain name. (This name then becomes the LCM pr ompt.) sysName - {system 5} DisplayString (SIZE (0.
3-22 Configuring Y our ELS100-16TX Set Comm unity Name The set community name variable ( kxadminAnyPass ) and get community name variable ( kxadminGetPass ) must be set to the value of the community name used by the SNMP manager for performing either set or get operations.
4-1 CHAPTER 4 MONITORING AND MANAGING Y OUR ELS100-16TX Monitoring the ELS100-16TX consists of collecting and analyzing statistics and system status information. Y ou can use the Select button on the front panel of the ELS100- 16TX to monitor segment status on any of the Ethernet ports.
4-2 Monitoring and Managing Y our ELS100-16TX ELS100-16TX statistics ar e divided into four groups: • System statistics • Ethernet port statistics • T raffic analysis statistics • SNMP statistics Y ou can use this information to analyze your overall network performance and to make configuration changes as necessary .
Monitoring and Managing Y our ELS100-16TX 4-3 • The number of spanning tr ee topology changes that have occurr ed since the ELS100-16TX was last reset. • The time since a topology change was last initiated. • The physical location of the ELS100-16TX.
4-4 Monitoring and Managing Y our ELS100-16TX 4.3 USING LCM TO CHEC K ELS100-16TX STATUS The LCM commands that enable you to quickly check on the status of the ELS100-16TX include: • Status • Addr ess display • Ipaddr • Ident These LCM commands ar e described in the sections that follow .
Monitoring and Managing Y our ELS100-16TX 4-5 If you do not want to view the status of each Ethernet port, use the Ctrl-C keys to r eturn to the LCM prompt. Software Currently Running: version xx.xx.xx software, Tue 08/23/94 15:0 Next Bootstrap (1st bank): version xx.
4-6 Monitoring and Managing Y our ELS100-16TX If you do not want to view the status of port 2, use the Ctrl-C keys to r eturn to the LCM prompt. Y ou can view the status for multiple of ports by typing status and indicating the range of port numbers, for example status 2-6 .
Monitoring and Managing Y our ELS100-16TX 4-7 T o display all MAC addresses, at the LCM pr ompt: 1. T ype addresses display any LCM r esponds with a list of all MAC addresses, their associated ports, the type, age, and number of frames fr om and to that addr ess.
4-8 Monitoring and Managing Y our ELS100-16TX LCM would display: The ipaddr command displays the IP addr esses, subnet masks, and MAC addr esses of all ELS100-16TX ports. At the LCM prompt: 1. T ype ipaddr LCM displays the curr ent IP addr ess table, for example.
Monitoring and Managing Y our ELS100-16TX 4-9 4.4 MANAGING THE ELS100-16TX Managing the ELS100-16TX consists of: • Disabling and enabling Ethernet ports • Changing a subnet mask • Changing a com.
4-10 Monitoring and Managing Y our ELS100-16TX 4.5.1 Disabling a P or t Ther e can be times when you need to disable a specific Ethernet port, for example, after you have determined that ther e is faulty equipment. Disabling a port ef fectively stops all bridging functions for that port.
Monitoring and Managing Y our ELS100-16TX 4-11 For example, enable 7-9 would enable ports 7, 8, and 9. LCM r esponds: noRIP Option The Routing Information Pr otocol (RIP) is one of the protocols that allows the ELS100-16TX to build an accurate, curr ent routing table.
4-12 Monitoring and Managing Y our ELS100-16TX LCM displays the curr ent IP addr ess table, for example: T o change the subnet mask, at the LCM prompt: 1. T ype ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK> For example, ipaddr 6 192.
Monitoring and Managing Y our ELS100-16TX 4-13 3. Enter the new community name. LCM pr ompts you to verify the new community name by r etyping it. 4. Retype the new community name. 4.5.5 Setting the Baud Rate Y ou can set the baud rate for your LCM console connection.
4-14 Monitoring and Managing Y our ELS100-16TX T o change the baud rate setting, at the LCM prompt: 1. T ype baud <baud rate> For example, baud 9600 would set the baud rate to 9600. LCM r esponds: 4.5.6 Setting a Reboot Time Y ou can enter the number of seconds the ELS100-16TX waits before r ebooting.
5-1 CHAPTER 5 ELS100-16TX DIAGNOSTICS AND T ROUB LESHOOTING The ELS100-16TX incorporates built-in diagnostic and testing capabilities which ar e convenient to use and cause minimal or no disruption to the r est of the operational network. These capabilities ar e effective for isolating pr oblems within the ELS100-16TX unit.
5-2 ELS100-16TX Diagnostics and T roubleshooting 5.1.2 Specific P ower -up T ests The power -up diagnostic tests performed on the ELS100-16TX include: • ROM checksum test • Instruction/Data memory test • FLASH checksum test • NVRAM checksum test 5.
ELS100-16TX Diagnostics and T roubleshooting 5-3 5.1.4 P ower -up Diagnostics Results After completion of the power -up diagnostic sequence, both the Power (Pwr) and CPU LEDs located on the fr ont panel of the ELS100-16TX should be on.
5-4 ELS100-16TX Diagnostics and T roubleshooting Figure 5-1. ELS100-16TX Fr ont Panel LEDs PWR CPU RESET COM PORT STA TUS MODE TX ACT FDX MON RX COL 100 USR STA TUS ELS100-16TX EPIM100 EPIM100 10X 12X.
ELS100-16TX Diagnostics and T roubleshooting 5-5 T able 5-1. Meaning of ELS100-16TX LEDs LED State Meaning Port Status Mode TX RX ACT COL FDX 100 MON USR On On On On On Off On Off On Blink On Indicates port is transmitting a packet. Indicates port is receiving a packet.
5-6 ELS100-16TX Diagnostics and T roubleshooting T able 5-2 describes the ELS100-16TX b uttons. 5.4 T R OUBLESHOOTING This section lists several situations that could happen while using the ELS100-16TX, and suggests appr opriate action.
ELS100-16TX Diagnostics and T roubleshooting 5-7 5.5.1 Connectivity Pr oblems • Check for LED abnormalities. • Check port status using LCM. • Check for loose port connections. • Check to see if the number of carrier losses is incr easing using LCM.
5-8 ELS100-16TX Diagnostics and T roubleshooting.
A-1 APPENDIX A T ECHNICAL SPECIFICATIONS A.1 ELS100-16TX SPECIFICATIONS Ph ysical Height 2.55 in (6.48 cm) W idth 17 in (43.18 cm) Depth 15.5 in (39.4 cm) W eight 9 lb (4.
A-2 T echnical Specifications Diagnostic LEDs Individual port link status Individual port segment status Segment status, specifying one of the following: - T ransmit activity - Receive activity - Both T ransmit and Receive activity - Collision - 100 (Mbps) - Duplex - MON (monitor) - User -defined CPU Power (PWR) Standar d Suppor t • IEEE 802.
T echnical Specifications A-3 Address T able Siz e 8,192 dynamic entries Management Suppor t • MIB II, 802.1d, 802.3, and Cabletr on Enterprise MIB • Cabletr on Systems Local Console Manager (LCM) • Any SNMP-based network management system Regulatory Compliance Safety UL 1950, CSA C22.
A-4 T echnical Specifications T able A-2. DB9 Pin Assignments A.3 100B ASE-T PIN ASSIGNMENTS An Ethernet twisted-pair link segment r equir es two pairs of wires. Each wir e pair is identified by solid and striped colored wir es. For example, one wir e in the pair might be red and the other wir e, red with white stripes.
T echnical Specifications A-5 a. The “+” and “-” signs are used to r epresent the polarity of the two wires that make up each wir e pair . A.4 STRAIGHT-THR OUGH WIRING If the twisted-pair lin.
A-6 T echnical Specifications A.6 THE 5 - 4 - 3 RULE Between any two nodes (i.e., PCs or other stations) on the network, ther e can be: • Up to five segments in series • Up to four r epeaters or multi-port hubs • Up to thr ee populated segments (that is, segments attached to two or mor e PCs).
T echnical Specifications A-7 Figure A-2. EPIM-100FX Specifications for the EPIM-100FX ar e listed in T able A-6. The transmitter power levels and r eceive sensitivity levels listed are peak power levels after optical overshoot.
A-8 T echnical Specifications.
B-1 APPENDIX B GLOSSARY address A set of characters that uniquely identifies a station, peripheral device, node, or other unit in a network. address table A database of device addresses and their associated ports maintained by a switch or bridge for use in making data packet forwar ding and filtering decisions.
B-2 Glossar y backbone The major , central transmission path for a network. A backbone usually handles high-volume, high-density traf fic. T ypically a backbone connects various LANs into an integrated network.
Glossar y B-3 congestion A condition where a portion of the network is overloaded with mor e data than can be transmitted in the desired time period. CSMA/CD (carrier -sense multiple access with collision detection) A channel access (contention) method that requir es each station to wait for an idle channel befor e transmitting.
B-4 Glossar y encapsulation A method for moving messages across networks that use dif ferent types of pr otocols. The message is encapsulated (rather than translated), so it can move acr oss a network that otherwise could not understand its pr otocol.
Glossar y B-5 ICMP (Internet control message protocol) An auxiliary pr otocol of IP used to convey advice and err or messages about events in the IP layer . IEEE (Institute of Electrical and Electronic Engineers) International pr ofessional society which issues networking and other standar ds.
B-6 Glossar y internetworking The linking of one or mor e networks to facilitate communication acr oss networks. interoperability The ability of equipment fr om multiple vendors to exchange information using standar dized protocols. IP (Internet protocol) IP is the basic datagram protocol used at the network layer of the TCP/IP stack.
Glossar y B-7 MAC (media access control) The data link layer sublayer r esponsible for scheduling, transmitting, and r eceiving data on a shared medium local ar ea network. mask Specified a subset of a lar ger set of data to be included for comparison and analysis.
B-8 Glossar y OSI (Open Systems Interconnection) Refers to the OSI r eference model, a logical str ucture for network operations. OSI is the internationally accepted framework of standar ds for internetwork communication.
Glossar y B-9 protocol A set of rules used by computers and related devices to communicate with each other . protocol suite A group of pr otocols related to a common framework. RARP (reverse address resolution protocol) A protocol that binds MAC addr esses to specific IP addr esses.
B-10 Glossar y switch An intelligent, pr otocol independent device used to connect similar or dissimilar LANs. symbol The smallest signaling element used by the MAC sublayer . Each symbol corr esponds to a specific sequence of code bits to be transmitted by the physical layer .
Glossar y B-11 upstream Refers to the r elative position of a station in a network to another station in the same network. A station is upstr eam from its neighbor if it r eceives data before its neighbor r eceives the data. W AN (wide area network) A communication network that spans a large geographic ar ea.
B-12 Glossar y.
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 Cabletron Systems SmartSTACK 100 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 Cabletron Systems SmartSTACK 100 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Cabletron Systems SmartSTACK 100 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Cabletron Systems SmartSTACK 100 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Cabletron Systems SmartSTACK 100, 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 Cabletron Systems SmartSTACK 100.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Cabletron Systems SmartSTACK 100. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Cabletron Systems SmartSTACK 100 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.
