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Fault Tolerance

58

Limitations also exist when massive chassis reconfigurations occur. If all
modules boot at the same time, the voting process described above is
performed. If many modules have been swapped all at once, incorrect data
could be used. If, for example, several modules had previously been installed
together in a different chassis, they would all “vote” the same way and their
(incorrect) data might be used. This can be avoided by making configuration
changes incrementally, or with backplane power applied so that the Master
never needs to ask for a vote.

With a standalone AT-3600 Series Repeater, however, there’s not much the
software can do when this single unit is swapped with a spare—there is no
Backup! You must reconfigure in this case.

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Содержание CentreCOM 3600 Series

Страница 1: ...CentreCOM 3600 Series Hub Repeaters and AT S4 Firmware Module Network Operations Manual ...

Страница 2: ...luding but not limited to lost profits arising out of or related to this manual or the information contained herein even if Allied Telesyn International has been advised of known or should have known the possibility of such damages Ethernet is a registered trademark of Xerox Corporation UNIX is a registered trademark of UNIX System Laboratories Novell and NetWare are registered trademarks of Novel...

Страница 3: ...7 Local Hub Connection 7 Central Site Connection 10 Agent Software 11 AT View 11 Boot Protocol BootP 11 Trivial File Transfer Protocol TFTP 12 Contacting ATI Technical Support 13 Phone Numbers 13 Bulletin Board Services 14 Internet Mail 14 CompuServe Forum 14 Related Documentation 14 Chapter 2 Installation 15 CentreCOM Multiport Hub 15 Master Module 15 Backup Module 15 Software Installation 16 Upd...

Страница 4: ...ptions 33 Hub Overview Graph 34 Hub Statistics Counter Graphs 34 Module Statistics Menu 35 Options 35 Module Overview Graph 36 Module Statistics Counter Graph 36 Individual Port Statistics 37 Administration Menu 38 Hub Name Menu 38 Module Name Menu 39 Password Timeout Menu 39 Network Parameters Menu 40 Hub IP Address 40 Subnet Mask 41 Gateway Address 41 SNMP Address 41 Get Community String 42 Set ...

Страница 5: ...7 Chapter 6 SNMP Management 59 Overview 59 SNMP Commands 59 Management Information Base 59 AT 3600 Series Repeaters 60 Appendix A Data Cabling Techniques 61 10BASE T 61 UTP Hub to MAU Wiring 62 UTP MAU to MAU Hub to Hub Wiring 63 MDI MDI X Switch 63 10BASE FL FOIRL Ethernet 65 10BASE5 Thick Ethernet 65 AUI Drop Cables 65 10BASE2 Thin Ethernet 65 Appendix B Glossary 67 Appendix C Technical Support ...

Страница 6: ...t Through 62 Figure 7 RJ45 Cable 63 Figure 8 Hub to Hub or MAU to MAU Wiring 63 Figure 9 Hub to MAU Wiring A Usable and B Unusable 64 List of Tables Table 1 Manageable AT 3600 Series Repeater Models 3 Table 2 RS232 Cable 19 Table 3 Required Terminal Control Characters 21 Table 4 Optional Terminal Control Sequences 22 Table 5 Statistics Database Per Port Counters 23 Table 6 Statistic Database Hub W...

Страница 7: ...sis In such a department concentrator chassis the configuration status and statistical information of Slave repeaters will appear on the network management displays and can be manipulated in the same way as the data from the manageable modules This manual refers to two or more chassis mounted repeaters as a department concentrator The term hub refers to either a standalone repeater or a department...

Страница 8: ...s of the media type or number of ports Internal universal power supply IEEE 802 3 compliance Ethernet Version 1 0 and 2 0 compatible repeater functionality Appliqué port supports optional transceiver modules for backbone or interrepeater connectivity Unshielded Twisted Pair UTP 10BASE T Thinnet 10BASE2 Attachment Unit Interface AUI 10BASE5 Fiber optic Fiber Optic Inter Repeater Link FOIRL 10BASE F...

Страница 9: ...e the reliability of communication throughout the network The AT 3600 Series complies with IEEE standards for 802 3 Carrier Sense Multiple Access with Collision Detection CSMA CD Ethernet you should refer to these standards when implementing your network Some important guidelines for ensuring integrity in network wiring appear in CentreCOM 3600 Series Hub Repeaters Installation Manual Model Number...

Страница 10: ...SHING COLLISION ACTIVITY STATUS 6 8 5 7 2 4 1 3 FOIRL LINK APPLIQUÉ PORT RS 232 TERMINAL PORT POWER STATUS MASTER POWER FAULT 3612T CentreCOM TM IEEE 802 3 ETHERNET 10BASE2 MULTIPORT HUB REPEATER with Network Management Indicator OFF PORT ACTIVITY 10BASET NETWORK PORTS 1 12 No Link PORT STATUS INDICATOR STATUS MASTER FAULT P O W E R 10 12 9 11 Link Receiving Indicator ON Indicator FLASHING COLLISI...

Страница 11: ...ort the new firmware is copied to the repeater s onboard non volatile flash memory at power up Refer to Chapter 2 for information on AT S4 capabilities and installation Standard Agent Software Standard agent network management software includes SNMP Management Information Base II MIB II Repeater MIB Out of band ASYNC ASCII terminal port Omega Remote network monitoring Telnet management RFC 854 SNM...

Страница 12: ... network management through the ASCII terminal connected to the RS232C ASYNC Management Module Bus port A discussion of the RS232C ASYNC Management Module Bus port follows the discussion of Omega Omega supports the following Statistics Internal self diagnostics Setting TCP IP parameters Port status indications Control of software downloading functions Connection to a remote repeater Naming of repe...

Страница 13: ...ole serial port connected directly to a terminal or PC To enable central site management of multiple hubs the Omega agent requires that a TCP IP address be installed in each hub To enable hub management through the Omega Connect to a remote hub option you will need to choose one of the following For a non TCP IP network each hub may be assigned a hub name or each hub may be managed through its pre...

Страница 14: ...or program To be sure these options are always available save them as an Omega file i e omega trm 4 To activate the program press the return key several times This will ensure configuration of the appropriate baud rate The Main Menu of the Omega local management program will appear on your screen as follows Always be sure you are using a full screen at your terminal or PC Otherwise you may not see...

Страница 15: ...lower case letters Usually the first letter of the first word in a menu option will be all that is required to call up a submenu Sunnyvale Main Please select an option Hub name Module name Password timeout Network parameters Terminal configuration Language langue idioma linguaggio sprache Send updated software to another hub Update software in all hubs Activity monitor EtherMeter Diagnostics Conne...

Страница 16: ...o enable local connection to multiple hubs in a TCP IP LAN you must first assign an IP address to every LAN connected hub Once the IP addresses have been assigned the Telnet application allows access to the local Omega program from anywhere in that network The following procedures will enable remote hub management across a WAN Connect a modem to the remote hub s serial port providing access to the...

Страница 17: ...SNMP devices require an IP address if they are to be managed environments that do not have BootP require you to enter the IP address manually BootP is covered under RFC 951 and includes the following requirement In the case of clients who do not know their IP addresses the server must also have a database relating hardware addresses to IP addresses This client IP address is then placed into a fiel...

Страница 18: ...tocol client Once you have these files BootP should be initialized when the server reboots Below is an example from Allied Telesyn s SUN system bootptab file which is used to load an IP address between one of our bridges and one of our repeaters bridge ht ethernet ha 0000F4800a ip 149 35 1 254 sm 255 255 255 0 repeater1 ht ethernet ha 0000F46541 ip 149 35 17 7 sm 255 255 255 0 Trivial File Transfe...

Страница 19: ...hub is as follows tftp get image s4 149 35 16 44 AT3600 octet You follow the same procedure to send put a file on a managed AT 3600 series managed hub Contacting ATI Technical Support Problems You can contact ATI s Technical Support staff by Telephone Bulletin board services Electronic mail via the Internet CompuServe forum When you contact Technical Support you should have the following informati...

Страница 20: ... 1992 Internetworking with TCP IP Principles Protocols and Architecture 2nd edition Volumes I and II Douglas Comer Prentice Hall 1991 The Simple Book An Introduction to Management of TCP IP based Internets Marshall T Rose Prentice Hall Second Edition 1994 Internet RFCs can be obtained through anonymous FTP or e mail to rfc info ISI EDU with the message help ways_to_get_rfcs Internet drafts are ava...

Страница 21: ...e manages all modules in the chassis For the purposes of network topology analysis all repeater modules combined in a department concentrator chassis collectively count as just one repeater Master Module The uppermost manageable AT 3600 module in a chassis performs all management reporting activities and is referred to as the Master The other AT 3600 modules in the same chassis are called Slaves M...

Страница 22: ...repeater into a network that has older AT 3600 modules running an earlier software version you should update the other hubs to the latest version You can use this compact cassette similar to a cassette cartridge used in laser printers and other devices to override the login options for password protection and menu language The firmware cassette includes network management agent software for any ma...

Страница 23: ...screw the thumbscrews and slide out the blank plate by grasping the loosened thumbscrews 4 Slide the firmware cassette into the port firmly press the connector housing into place and tighten the thumbscrews The firmware cassette backing plate should be flush with the repeater panel 5 Plug the power cord into the repeater Downloading will proceed taking up to two minutes The repeater s front panel ...

Страница 24: ...r from that Master module you can load the new software into other selected AT 3600 Series Repeaters If you want you can run the new software on a limited number of hubs as a kind of dry run When you have become familiar with the new release you can load it from one of the Masters to all other modules in the network You can identify an individual repeater to be updated by its Ethernet address its ...

Страница 25: ...tors with a pin interface to connectors with a hole interface For some applications you will need a conversion cable One kind of conversion cable allows the AT 3600 Series Repeater to perform as Data Communication Equipment DCE a different cable allows the repeater to serve as Data Terminal Equipment DTE You may connect the terminal directly with the repeater as a DCE or through an asynchronous mo...

Страница 26: ... DTE signal Data Terminal Ready DTR must be asserted at the hub and Request To Send RTS will be ignored These pre defined signals will provide compatibility with almost all possible user devices When using a null modem cable to interface to a modem DTR and RTS will be asserted constantly and DSR and CTS will be ignored This is compatible with common auto answer full duplex modems When you quit a m...

Страница 27: ...port on the hub select the Windows terminal icon and press RETURN twice to initiate a session In addition to DOS or Windows based terminal emulators you may use almost any asynchronous dumb terminal for hub management The terminal must adhere strictly to the American Standard Code for Information Interchange ASCII character set and support the ASCII control codes listed in Table 3 Table 3 Required...

Страница 28: ...ve the appearance of a line at a time glass teletype If you configure a terminal with the Erase Screen capability Omega does not scroll the screen but instead erases and paints the screen top down This is generally more pleasant than scrolling If the terminal has the Home Cursor capability Omega will not erase or scroll the screen to update an existing display but will instead home the cursor and ...

Страница 29: ...es and no Collision or Alignment Error occurrences Alignment Errors Frames with a non integral number of bytes i e the frame length in bits was not evenly divisible by 8 but with the proper length 64 1518 bytes Runts Frames less than the Ethernet IEEE 802 3 minimum frame length 64 bytes including the CRC Long Frames Frames greater than the Ethernet IEEE 802 3 maximum frame length 1518 bytes includ...

Страница 30: ... the RETURN ENTER key twice on the terminal connected to the RS232 port Make a virtual circuit connection to the management agent Telnet A session begins when either of these events occurs Once in session the management agent and the Statistics Database are locked against other session requests that is while connected in a virtual circuit the hub will ignore the RS232 port and vice versa This prev...

Страница 31: ...n a single screen In this case the management agent displays more on the screen The remaining text will be displayed when you type m All menus and messages are multilingual you can choose a preferred human language from the following English French German Italian Spanish Japanese You can change the active language by using the Language command under the Administration Menu You can access this comm...

Страница 32: ...cal session is not ended using the Quit command before the communication link is broken the session continues This prevents initiating another session local or Telnet until the current session is ended or the timeout duration set in the Password timeout menu is reached Remote Telnet virtual circuit sessions will automatically end quit when the virtual circuit is disconnected If you have configured...

Страница 33: ...mes At the top of the Main Menu is the product name and immediately below is the user assigned symbolic hub name if any Sunnyvale in this example At the very bottom of the screen is a prompt where the cursor will be blinking awaiting input Allied Telesyn AT 3612T Extendable Hub Sunnyvale Please select an option Port status Hub statistics Module statistics Individual port overview Administration Qu...

Страница 34: ... RETURN ENTER The currently selected module is always highlighted with an arrow as is Accounting A in the example above Each hierarchical level in the network from hub level to module level to port level is associated with a particular set of data and management functions as the subsequent screen displays indicate When operating standalone not installed in a department concentrator chassis the man...

Страница 35: ... Offline Online indicates that IEEE 10BASE T standard Link Integrity pulses have been detected on this port confirming that the device on this port is operational Offline indicates that no Link Integrity pulses have been detected either the device is not operational powered down etc or there is a physical problem with the link wiring indicates that no Link Integrity Tests are to be performed on th...

Страница 36: ...ty the port s Polarity Correction Mode is set to Manual and the incorrect polarity has not been corrected Corrected indicates incorrect polarity that has been corrected by the AT 3600 the port s Polarity Correction Mode is set to Automatic this is the default and the incorrect polarity has been automatically corrected The Polarity column is not meaningful for the AUI port and is not displayed for ...

Страница 37: ...module to automatically change the port s state to Normal or Partitioned as appropriate however if the port has been partitioned by hub software the user cannot change its state back to Normal Selecting Disable turns the port logically off preventing any port traffic from being repeated Reconnection The Standard IEEE reconnection algorithm specifies that a Partitioned port will be automatically ch...

Страница 38: ...s This option clears all of the statistics counters for this port to zero AUI Port The Port Configuration Menu for the AUI port is somewhat different as some of the items do not apply to this port Sunnyvale Module 1 Accounting A Port 2 Jane This port s current name is Jane Please enter a new name or Return to retain the existing name Sunnyvale Module 1 Accounting A Port 13 AUI Corporate Backbone P...

Страница 39: ...hese options are described below Zero Counters This option clears all of the statistics counters on the entire hub to zero All of the following Omega Manager graph displays are automatically updated every few seconds when the Omega Manager is configured for a terminal with cursor control capabilities such as ANSI When using the terminal without cursor control you can manually update the screen by ...

Страница 40: ...counter value is shown to the left of the graph and the graph itself provides a visual comparison of each module Note that on a standalone AT 3600 this graph is never displayed If you select a counter from the Hub Statistics Menu a port by port graph is shown instead of a module by module graph This graph is essentially identical to the Module Statistics Counter Graph described later in this chapt...

Страница 41: ...tistics Counters Alternatively you can select any of the Statistics Database counters shown All of these options are described below Zero Counters This option clears all of the statistics counters on the entire module to zero Sunnyvale Module 1 Accounting A Please select an option Module overview Individual port overview TOtal frames Good frames Bad frames Crc errors Alignment errors Runt frames L...

Страница 42: ...tatistics counter Total Frames in this example is graphed for each of the currently selected module s ports Each port s counter value is shown to the left of the graph and the graph itself provides a visual comparison of each port Sunnyvale Module 1 Accounting A Good Frames 100 CRC Errors 16 Alignment Errors 0 Runt Frames 3 Long Frames 1 Bad Frames 20 Total Frames 120 Port Collisions 6 Late Collis...

Страница 43: ...ph similar to the following will then appear All of the selected port s statistics counters are graphed Each counter value is shown to the left of the graph and the graph itself provides a visual picture of the port s network activity Note Sunnyvale Module 1 Accounting A Please select a port Port 1 Joe Port 2 Jane Port 3 Bill Port 4 Betty Port 5 Port 6 Port 7 Port 8 Port 9 Port 10 Port 11 Port 12 ...

Страница 44: ... If you choose the Hub name option from the Administration Menu the following new menu appears Sunnyvale Please select an option Hub name Module name Password timeout Network parameters Terminal configuration Language langue idioma linguaggio sprache Send updated software to another hub Update software in all hubs Activity monitor EtherMeter Diagnostics Connect to a remote hub Note Sunnyvale The H...

Страница 45: ...eout option from the Administration Menu the following new menu appears The password protects access to the management agent software The default is no password If you choose to use password protection the management agent will demand the password when each new session begins You may enter a new password up to 20 characters in length or just press RETURN to keep the existing password Your password...

Страница 46: ...ure any of these network parameters You are led through a series of configuration screens as shown on the following pages The values displayed are for illustration only your screen will display the values appropriate for the system being configured Hub IP Address Enter the IP address for the AT 3600 as shown Sunnyvale Module 1 Accounting A The current timeout is 0 Please enter a new timeout value ...

Страница 47: ... Please enter a new value or RETURN to retain the existing one Enter a value in the form of a b c d where a b c and d are each in the range 0 255 For example 128 9 3 1 Sunnyvale The current Gateway Address is Null not currently configured Please enter a new value or RETURN to retain the existing one Enter a value in the form of a b c d where a b c and d are each in the range 0 255 For example 128 ...

Страница 48: ...e Trap Community String Enter the SNMP Community String for the SNMP Trap function The default value is public Sunnyvale The current Get Community String is Please enter a new value or RETURN to retain the existing one Sunnyvale The current Set Community String is Please enter a new value or RETURN to retain the existing one Sunnyvale The current Trap Community String is Please enter a new value o...

Страница 49: ...layed by SNMP management stations and is intended to identify the name of the person within your organization who is primarily responsible for this AT 3600 or the location in which it is installed Sunnyvale The current Download Password is AT3600 Please enter a new value or RETURN to retain the existing one Sunnyvale The current Location string is Null not currently configured Please enter a new v...

Страница 50: ...remembers all changes and retains them in a power failure Any changes to serial interface options data bits stop bits parity data rate are remembered but do not take effect until the next management agent session i e you must select Quit from the Main Menu and then press RETURN to begin a new session When you are connected to the management agent through a virtual circuit connection over the netwo...

Страница 51: ...er sequence either by typing control characters individually or by pressing the terminal s appropriate function key if it has one For example if the terminal s sequence to home the cursor is ESC H you can either press the ESC key followed by the H key or simply press the Home Cursor function key on the terminal Since control sequences may contain character codes otherwise used for input editing su...

Страница 52: ...as a delimiter then type control sequence or function key If the terminal does not have this capability then just hit Return Enter the control sequence to HOME THE CURSOR Enter the control sequence to ERASE THE ENTIRE SCREEN This sequence will only be used from the home position Begin by typing any character as a delimiter then enter the control sequence itself if the terminal has a function key t...

Страница 53: ...uence must erase from the cursor position to the end of the line Begin by typing any character as a delimiter then enter the control sequence itself if the terminal has a function key to send the sequence then just hit that function key finally type the delimiter character again to end your input For example if you use as a delimiter then type control sequence or function key If the terminal does ...

Страница 54: ...u would appear as follows Note Sunnyvale Please select an option English anglais ingles inglese englisch French francais frances francese franzoesisch Spanish espanol espagnol spagnolo spanisch Italian italiano italien italiano italienisch German deutsch allemand aleman tedesco Japanese japonais japones japonese japanisch Sunnyvale Por favor seleccione una opcion INgles english anglais inglese eng...

Страница 55: ...age through a power failure The language option in the Japanese version of the management agent will offer only English and Japanese Kanji Allied Telesyn AT 3612T Centro Sunnyvale Por favor seleccione una opcion Estado de puerto Centro estadistica Modulo estadistica Generalidades de puerto Administracion Salida O seleccione un modulo 1 Accounting A 2 Accounting B 3 Marketing A 4 Marketing B 5 Engi...

Страница 56: ...not already running the current software release the software running on the hub from which you issued this command After this message is broadcast the management agent switches to Activity Monitor mode see below to enable you to monitor download activity Activity Monitor This option displays a variety of messages showing system activity as it occurs You enter this mode by selecting either the Act...

Страница 57: ...g addresses respectively of the portion of memory currently being downloaded Sunnyvale modulexAAAAA is now On Line modulexAAAAA has been removed modulexAAAAA has failed Sunnyvale modulexAAAAA porty AAAAA Port is now partitioned modulexAAAAA porty AAAAA Port is no longer partitioned modulexAAAAA porty AAAAA Port is now Off Line modulexAAAAA porty AAAAA Port is now On Line Sunnyvale Download request...

Страница 58: ...n of the port indicators on the current repeater module s front panel The indicators ordinarily display network activity on an indicator per port basis Activating the EtherMeter option employs the indicators on a per repeater or per module basis The indicators cooperatively show a cumulative display of network activity much like a graphic equalizer displays the volume of sound at a certain frequen...

Страница 59: ...ed The results for each test will either indicate Good or Failed Diagnostic tests may be run on any module within a department concentrator If the currently selected module has a failure that can no longer communicate across the backplane bus the message Module does not respond will appear Note that these diagnostics are limited since they must be executed live Connect to a Remote Hub When you cho...

Страница 60: ...he AT 3600 hubs at the remote site you can dial into the network and directly manage the remote hub attached to the modem Using the Connect command you may then also manage other AT 3600 hubs on the remote network If you are specifying the hub by its alias be sure to enclose the name in single quotation marks e g name When the Telnet connection is established you will see the Main Menu from the re...

Страница 61: ...xt higher numbered slot position after the Master Department Concentrator Reconfiguration Each module in a department concentrator of multiple AT 3600 Series Repeaters knows its own slot position within the chassis and which other slot positions are occupied From this information each module determines whether it should act in the capacity of a Master Backup or Slave This process is called role de...

Страница 62: ...role determination process described previously In the case of the Master s failure not removal the Backup can take over the Master s functions but the chassis does not allow another module to take over as a new Backup Therefore only a single level of hot standby redundancy exists in this case only If you were to remove the failed Master role determination would cause the entire department concent...

Страница 63: ...ing The Master attempts to resolve this through a process called voting It polls each installed module and examines the stored configuration data The configuration data that is stored on the greatest number of modules is declared to be the correct data i e the majority rules For example if a data set we ll call A exists on modules 1 3 and 4 and data set B exists on module 5 it is concluded that da...

Страница 64: ...dules had previously been installed together in a different chassis they would all vote the same way and their incorrect data might be used This can be avoided by making configuration changes incrementally or with backplane power applied so that the Master never needs to ask for a vote With a standalone AT 3600 Series Repeater however there s not much the software can do when this single unit is s...

Страница 65: ...l retrieve a variables value GET NEXT will retrieve the next part of the variable or the next variable These two commands are read commands The third command is a write command called SET SET will write a value into a hub variable provided the variable is not a read only variable In addition the agent can inform the stations of significant events via a TRAP mechanism Management Information Base Th...

Страница 66: ...or PING RFC 783 Trivial File Transfer Protocol TFTP RFC 854 Telnet Protocol Specifications RFC 906 Bootstrap loading using TFTP RFC 951 Bootstrap Protocol BootP RFC 1084 Bootstrap vendor information extensions RFC 1157 Simple Network Management Protocol SNMP RFC 1212 Concise MIB Definition describes ASN 1 mapping RFC 1215 SNMP Traps RFC 1368 Definitions of Managed Objects for IEEE 802 3 Repeater D...

Страница 67: ...heir high speed data transmission characteristics are radically different The identification problem is exaggerated by the fact that some suppliers have sold purportedly data quality cables manufactured with voice quality cabling If any voice quality cabling is used in a 10BASE T network system data movement is slow collision prone or non existent To confuse the issue the Link indicator on the int...

Страница 68: ...een a hub and a Media Access Unit MAU or NIC the cable is wired straight through That is an RJ45 receptacle at the hub would wire pin to pin to the RJ45 receptacle at the MAU as shown in Figure 6 Cable Level Cable Description AC Character Specification Twist Foot 10BASE T OK 1 Unshielded untwisted N A CCITT N A NO 2 Individual UTP 100 Ω 30 Ω RS232 10BASE5 AT T PDS N A NO 3 Typical Individual UTP 1...

Страница 69: ...sition This eliminates the need for making or obtaining a crossover cable as shown in Figure 8 The interface type that IEEE specifies as standard for a repeater such as the AT 3624TR is MDI X The straight through crossover switch merely provides convenience to avoid having to obtain an alternate cable in some applications If you connect a cable and it does not work try changing the MDI switch The ...

Страница 70: ...sult in excessive common mode noise and an unacceptably high data error rate Model Connected to MDI MDI X AT 3624TR Hub X AT 3624TR RJ45 Transceiver X AT 3624TR NIC X 1 This table assumes a straight through cable is being used The switch setting are the opposite of what is shown if a crossover cable is being used Figure 9 Hub to MAU Wiring A Usable and B Unusable Not Used RD Not Used Not Used RD T...

Страница 71: ...f a 10BASE5 coax segment is 2165 ns Propagation delay of 10BASE5 Ethernet coax is calculated at 4 33 ns meter Both ends of the segment must be terminated with a 50 Ω termination with a power rating of 0 5 watts or greater Earth grounding of the segment shield must take place at only one point on the cable AUI Drop Cables AUI or Drop cables can be no longer than 50 meters 164 ft each Attachments ma...

Страница 72: ...PIN TELCO RJ21 This connector is very common in 10BASE T wiring As opposed to the RJ45 connector the 50 pin Telco connector concentrates up to 12 UTP connections onto one connection This concentration of UTP ports is then broken out for connection to a punch down block inside a building s wiring closet 50 pin Telco connections provide a very clean uncluttered interface to the building s wiring AT ...

Страница 73: ...m concurrent transmissions on the physical medium COLLISION PRESENCE A signal provided by the PLS to the PMA sublayer within the physical layer to indicate that multiple stations are contending for access to the transmission medium COMPATIBILITY INTERFACE The MDI coaxial cable interface and the AUI branch cable interface the two points at which hardware compatibility is defined to allow connection...

Страница 74: ...ng from a central point The term hub is often used interchangeably with the term repeater Multiport 10BASE T 10BASE2 and fiber optic 10BASE FL FOIRL repeaters are considered hubs See Repeater HUB to HUB WIRING See MAU to MAU Wiring HUB to MAU WIRING UTP cables for 10BASE T hub to MAU or NIC cards are wired straight through An RJ45 receptacle at the hub would wire pin to pin to the RJ45 receptacle ...

Страница 75: ...an AUI port on a workstation repeater bridge or other Ethernet device MDI MDI X See Medium Dependent Interface MEDIUM ATTACHMENT UNIT MAU In a LAN a device used in a data station to couple the DTE to the transmission medium MEDIUM DEPENDENT INTERFACE MDI The mechanical and electrical interface between the trunk cable medium and the MAU MDI X is another version of the interface that enables like de...

Страница 76: ...maximum allowable end to end trunk transmission line length Repeaters perform the basic actions of restoring signal amplitude waveform and timing applied to normal data and collision signals RJ45 This connector is a 10BASE T standard for connecting UTP cabling It is inexpensive and easy to install onto UTP cable SIGNAL QUALITY ERROR SQE Also referred to as Collision or Collision Presence This occu...

Страница 77: ...C users particularly as a means of communication with large multi user computers TELCO CONNECTOR A 50 pin receptacle that plugs into the front of the hub enabling cables from external devices to connect to the hub THICK ETHERNET See 10BASE5 THIN ETHERNET See 10BASE2 TRUNK CABLE The trunk coaxial cable system UNMANAGED MODULE A repeater that behaves as a dumb repeater in a department concentrator c...

Страница 78: ..._____________ ____________________________________ ____________________________________ ____________________________________ ____________________________________ ____________________________________ Conditions List the steps that led up to the problem ___________________________ ____________________________________ ____________________________________ ____________________________________ _________...

Страница 79: ...g ______ Data Cabling Techniques _______ Reading the LEDs ______ Telnet Communication _______ Software Downloading ______ I found the following the most valuable ______________________________ _________________________________________________________________ _________________________________________________________________ I would like the following more developed ___________________________ _____...

Страница 80: ...t rate 68 bit time 68 bootP 11 12 bridge module 1 C cabling 10BASE2 2 3 30 65 67 68 10BASE5 2 65 67 10BASE FL 2 3 67 10BASE FL FOIRL 65 10BASE T 2 3 29 61 62 67 68 crossover 63 64 68 FOIRL 3 65 69 impedance 67 69 straight through 62 63 64 71 usable and unusable 64 UTP 30 61 62 63 64 carrier sense 68 carrier sense multiple access with collision detection CSMA CD 3 68 cascaded repeaters 15 chassis d...

Страница 81: ...5 59 get next 5 59 glass teletype 22 glossary 67 groups 23 H handshakes 56 hang up 20 harmonica adapter 69 home 22 hot standby 56 hot swap 5 hot swapping 69 hub 1 hub MIB 1 16 23 60 hub names unique 18 Hub Statistics Counters 33 hub statistics menu hub overview graph 34 hub statistics 33 hub statistics counter graphs 34 individual port overview 33 module statistics 33 options 33 zero counters 33 h...

Страница 82: ...stration 25 38 39 44 50 52 53 download 50 hub name 38 hub statistics 37 language 48 main 25 27 35 38 44 48 49 53 54 module name 39 module statistics 35 36 network parameters 40 password timeout 39 port configuration 30 port configuration update 32 port status 25 29 30 terminal configuration 44 MIB 23 24 59 60 MIB II 6 16 module 70 backup 67 master 70 slave 71 module failures 56 module statistics 3...

Страница 83: ...epeater software download constraints 18 upgrading from cassette 2 15 upgrading from download 2 15 Request For Comments RFC 60 request to send RTS 20 RJ45 connectors 3 role determination 55 56 RS232 DB25 19 RS232 DCE 20 S session 24 set 5 59 Signal Quality Error SQE 71 Simple Network Management Protocol SNMP 71 simple network management protocol SNMP 1 network management stations 6 site license 16...

Страница 84: ... names 18 unmanaged module 72 unshielded twisted pair UTP 2 Unshieled Twisted Pair UTP 72 UTP 67 W window 25 wiring 2 3 29 30 61 62 63 64 65 67 68 69 71 AUI drop specification 65 house wiring 69 hub to hub 69 hub to MAU 69 MAU to MAU UTP hub to hub 70 thick Ethernet 72 thin Ethernet 72 trunk cable 72 ...

Страница 85: ...tsmouth NH Tel 603 431 6464 Fax 603 431 1649 Plaistow NH Tel 603 382 0815 Fax 603 382 0818 Dover NH Tel 603 743 3010 Washington D C Tel 703 506 0196 Fax 703 506 1986 Chicago IL Tel 708 406 8431 Fax 708 406 8462 Austin TX Tel 512 502 3087 Fax 512 794 9326 Dallas TX Tel 214 446 9873 Fax 214 446 8555 Houston TX Tel 713 265 8389 Fax 713 265 8386 Reading MA Tel 617 944 3492 Fax 617 944 3492 Los Angeles...

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