CentreCOM 3600 Series Hub/Repeaters and AT-S4 Firmware Module Network Operations Manual
Copyright 1995 Allied Telesyn International All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International. Allied Telesyn International reserves the right to make changes in specifications and other information contained in this document without prior written notice. The information provided herein is subject to change without notice.
Table of Contents Chapter 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 CentreCOM AT-3600 Series Repeaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Connectivity . .
Table of Contents Chapter 3 Repeater (Hub) Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Supported Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Statistics Database .
Download Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Update Selected Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Download All Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Activity Monitor . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Appendix E Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77 Appendix F Where To Find Us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83 List of Figures Figure 1: AT-3612TR Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Overview This manual describes the software installation and network management procedures for the AT-3600 series of independently manageable hub/repeater models. The AT-3600 series also includes “Slave” modules that are not manageable as standalone devices (the AT-3624TS and AT-3624TRS models) and a bridge module, the AT-3675. The AT-3675 model is shipped with its own manual and is not considered in this Network Operations Manual.
Overview Each manageable AT-3600 Series Repeater is a single building block for both standalone (repeater) and chassis (department concentrator) configurations. Allied Telesyn International (ATI) supplies desktop and rackmount department concentrator chassis that can hold up to eight AT-3600 Series Repeaters. Since the department concentrator chassis connects repeater modules across a backplane, a fully populated department concentrator behaves as a single repeater in the network topology.
CentreCOM 3600 Series Hub/Repeaters Connectivity Table 1 shows the various models of manageable AT-3600 Series Repeaters. You can mix any combination of model types in a department concentrator chassis for maximum flexibility.
Overview Chassis Configuration You can use a single manageable AT-3600 Series Repeater in standalone mode or as part of a department concentrator housed in a chassis. Various chassis models are available for desktop or rackmount configurations. These include 1-, 2-, 3-, 4-, 7-, and 8-module combinations for desktop or 19-inch rackmount installations with standard or fragmented backplanes. These chassis address a range of needs for different sized networks and uses.
CentreCOM 3600 Series Hub/Repeaters Network Management All manageable CentreCOM AT-3600 Series Repeaters are equipped with network management agents. In a standalone configuration, the agent makes the repeater a manageable node (or hub) on the network. In a department concentrator, the Master module provides agent services for the entire concentrator. Should the Master module fail, the Backup takes over the Master functions automatically.
Overview These three commands are executed against a lengthy list of variables (or managed objects) contained in either MIB II or the Repeater MIB. For example, TCP/IP and SNMP network parameters include: Repeater IP address, Subnet mask, Gateway address, SNMP manager address, ‘Trap’ community string, ‘Location’ string and ‘Contact’ string Omega. Omega is a term used by ATI to designate the network management agent contained in the AT-3600 Management Module.
CentreCOM 3600 Series Hub/Repeaters Management Planning Before installing and connecting manageable AT-3600 Series Repeaters at various site locations (such as in closets in a single building or in closets on different floors or in different buildings), you need to decide on the number of hubs in your network and where each hub is to be located. This advanced planning will facilitate the assignment of hub names, MAC and/or IP addresses.
Overview 3. Turn on your terminal or PC and call up the terminal emulator program. Check your screen display to be sure the configuration options are set as follows: ❑ ❑ ❑ ❑ Data bits: 8 Stop bits: 1 Parity: 0 Connector: Com1/Com2 (PC/terminal dependent) The Omega program supports autobaud, so baud rate does not need to be configured on the terminal side. These configuration options apply whether you are using Windows or a DOS-based terminal emulator program.
CentreCOM 3600 Series Hub/Repeaters 5. Enter the letter A to access the Administration 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 Connect to a remote hub -> 6.
Overview 8. For a TCP/IP network, enter N to call up the Network Parameters menu. This menu will lead you through a series of screens, each of which will ask you to enter values for such items as: Hub IP address, Subnet mask and Gateway address.
CentreCOM 3600 Series Hub/Repeaters Agent Software AT-View In addition to the Omega agent, ATI also provides an optional network management package called AT-View. This Windows-and/or UNIX-based SNMP software application offers an easy-to-use and inexpensive graphical user interface (GUI). AT-View is ideal for simple and fast diagnostics, as well as for configuration and the monitoring of network devices.
Overview If a BootP response is received, then the IP address, Subnet Mask, and/or Gateway/Router address will be extracted from the response packet and used to configure the system until the next power-on/reset. Additionally, if the response packet specifies a filename and a TFTP host address, then a TFTP ‘get’ request will be sent to the specified host, using the specified filename. This will initiate a TFTP download of operating software and allows you to maintain downloaded server software.
CentreCOM 3600 Series Hub/Repeaters The general form of the TFTP command line is: tftp direction localfile hostIP hostfile mode The meaning of each command line item is as follows: ❑ ❑ ❑ ❑ ❑ ❑ tftp: starts the TFTP program direction: either “put” or “get” localfile: the IP address of the AT-3600 series managed hub hostIP: the IP address of the AT-3600 series managed hub hostfile: the name of the remote host (or, in the case of ATI, the remote host password) mode: the transfer mode for the file The comma
Overview Bulletin Board Services A bulletin board is available. The number is: 206-483-7979 Modem settings are: 9600 baud; 8 bits; no parity; 1 stop bit. Internet Mail You can send electronic mail via the Internet to: tech_support@centre.com CompuServe Forum ATI has a forum on CompuServe. You can reach us by typing GO ALLIED at the CompuServe prompt (!).
Chapter 2 Installation CentreCOM Multiport Hub AT-3600 Series Repeaters act as IEEE 802.3 compliant Ethernet compatible installations. They support multiple stations on the network and have an additional network port for an AUI or other media appliqué to enable connection to the network’s main Ethernet backbone. An RS232 port allows connection to an asynchronous terminal or PC with terminal emulation for hub management.
Installation The management agent actually resides in every AT-3600 module, except the AT-3612FS, AT-3624TS/AT-3624TRS. These three models are configured as Slaves and can never serve as Master or Backup modules. The agent in the Master is active and available for use. The agent in the Backup remains inactive unless the Master fails. Refer to Chapter 5 on page 55 for further information on backup management and fault tolerance.
CentreCOM 3600 Series Hub/Repeaters To reinstall or update the management agent Note 1. If you are loading software in a single standalone repeater, turn off the power for the repeater and skip to step 3. 2. If you are loading the software to a hub consisting of multiple modules in a department concentrator chassis, remove the Master from the chassis. When removing the department concentrator Master, always disengage the Master from the chassis backplane before unplugging the power cord; i.e.
Installation 7. For a standalone repeater, the software installation is complete. 8. For a department concentrator Master, plug in the Master’s power cord and return Master to the chassis. The other modules in the chassis will then be automatically upgraded from the Master with no impact to the users on those modules. In a multi-module department concentrator, the Master controls software distribution to all of the Slaves within the same chassis.
CentreCOM 3600 Series Hub/Repeaters The RS232 Management Port AT-3600 Series Repeaters have a special management port for connecting a user-supplied serial device. This port conforms to the signaling characteristics of EIA standard RS232 and implements the signals necessary to support an asynchronous device. The physical connector is not, however, an RS232 DB25, but is instead a DB9 (see Figure 5) commonly used on PCs.
Installation AT-3600 Repeaters support various commonly used data rates (baud rates), from 75 bps to 19.2 kbps, as well as an automatic baud rate detection mode. Automatic baud rate detection mode is the default setting and facilitates repeater connections. The interface supports either 7 or 8 data bits; even, odd or no parity; and 1 or 2 stop bits. The RS232 DCE signals Data Set Ready (DSR) and Clear To Send (CTS) will be asserted constantly.
Chapter 3 Repeater (Hub) Management User Interface The AT-3600 management user interface enables you to control AT-3600 activities and the Statistics Database. You can access the management agent either by direct connection, via the RS232 port, or remotely, via a network virtual circuit connection. Supported Terminals Note If you are running Windows on your PC to access Omega, you can use the Windows terminal icon and ignore the following discussion.
Repeater (Hub) Management The management agent can also take advantage of selected special control (escape) sequences that the terminal may use for screen control. Table 4 lists these special sequences: Table 4: Optional Terminal Control Sequences Home Cursor Moves the cursor to the top-left screen position. Erase Screen Erases the entire screen, or erases from the current position to end-of-screen. Erase EOL Erases from the current position to the end of the current line.
CentreCOM 3600 Series Hub/Repeaters Statistics Database Omega maintains a database of statistical data on physical and datalink layer activities. It is actually a distributed database—portions of the database reside within each module of a hub. The Statistics Database complies with standards for Hub MIBs from the IEEE and the TCP community. Each manageable AT-3600 Series Repeater module maintains a collection of statistics counters on a per-port basis.
Repeater (Hub) Management In addition, the following counters listed in Table 6 are maintained on a hub-wide basis: Table 6: Statistic Database Hub-Wide Counters Transmit Collisions Frames with a collision occurring internal to the AT-3600 module; i.e., two or more AT-3600 ports attempted to transmit at the same time. Jabber Lockups Transmissions of excessive length that caused the AT-3600 module to enter Jabber Lockup mode. Power-up or reset clears the counters in the Statistics Database to zero.
CentreCOM 3600 Series Hub/Repeaters Selecting Menu Options When in session, the management agent offers a series of menus. You may select from a variety of options to view statistics or control AT-3600 activities. There are two ways to make menu selections: ❑ ❑ If the options are numbered, type the appropriate number and press the RETURN/ENTER key. If the options are not numbered, type enough of the option name to distinguish it from the other options.
Repeater (Hub) Management Ending a Session Note You can end a session by selecting the Quit option from the Main Menu. This returns the management agent to an idle, “listening” state and breaks the communication link. If connected via a modem, the phone circuit will be “hung up;” if connected via the network, the virtual circuit will be disconnected. If a local session is not ended using the Quit command before the communication link is broken, the session continues.
Chapter 4 Management Menus Main Menu When a new session begins, the first screen you see is the Main Menu, as shown below. The example shows a chassis configuration with six modules acting as one repeater. The modules occupy the first six slots of an eight-slot chassis, and have all been given departmental names.
Management Menus In the lower part of the sample screen, the available AT-3600 modules are displayed along with their respective symbolic names. To select one of the modules (which changes the management focus to the next hierarchical level), you may enter the module’s slot position within the chassis, which corresponds to the number shown on the display. For example, to select the “Manufacturing” module above, you would enter 6 followed by RETURN (ENTER).
CentreCOM 3600 Series Hub/Repeaters Port Status Menu When you select Port Status from the Main Menu, the following menu appears: Sunnyvale Module 1—Accounting A Port Status Port Link Status Polarity 1: Joe 2: Jane 3: Bill 4: Betty 5: 6: 7: 8: 9: 10: 11: 12: 13: Backbone Online Online Online Online Online Online Online Online Online Online Online Online Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal Normal N
Management Menus Status The Status column shows the port’s automatic or manual partitioning state: either Normal, Disabled or Partitioned. Normal indicates a port that is not currently partitioned—a ready (but not necessarily currently active) port. Disabled indicates a port that has been manually disabled via the management agent. Partitioned is shown if the port has been automatically disabled—the repeater state machine has placed the port in an Off line/ Disabled state.
CentreCOM 3600 Series Hub/Repeaters This display shows the current status and configuration of the selected port. At the top of the screen appear the symbolic hub name, the selected module and its symbolic name, and the selected port and its name. Next are the port’s status and configuration modes. At the bottom you see a list of menu options. Each currently configured choice is highlighted with an arrow (“>”).
Management Menus Change Port Name. This option allows you to specify a new symbolic name for the selected port. If you select it, the following screen appears: 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: -> You can enter a new name for the port, up to 20 characters in length, or press RETURN to keep the existing symbolic name.
CentreCOM 3600 Series Hub/Repeaters Hub Statistics Menu When you select hub statistics from the Main Menu, the following menu appears: Sunnyvale Please select an option: Hub overview Module statistics Individual port overview TOtal frames Good frames Bad frames Crc errors Alignment errors Runt frames LOng frames TRamsit collisions POrt collisions LAte collisions Short events Jabber lockups PArtitions Data rate mismatches Zero all statistics counters on the entire Hub Options Hub Overview.
Management Menus Hub Overview Graph If you select the Hub overview option from the Hub Statistics Menu, the following display appears: Sunnyvale Good Frames: CRC Errors: Alignment Errors: Runt Frames: Long Frames: Bad Frames: Total Frames: Transmit Collisions: Port Collisions: Late Collisions: Short events: Port Partitions: Data Rate Mismatches: 100 |##################### 16 |##### 0 | 3 |# 1 | 20 |###### 120 |###################### 6 |## 6 |## 0 | 0 | 0 | 0 | --------------------------- All of the hub
CentreCOM 3600 Series Hub/Repeaters Module Statistics Menu If you choose the Module statistics option from the Main Menu, the following display appears: 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 LOng frames POrt collisions LAte collisions Short events PArtitions Data rate mismatches Zero all statistics counters on this module -> Options Module Overview.
Management Menus Module Overview Graph If you choose Module overview from the Module Statistics Menu, the following graph appears: Sunnyvale Module 1—Accounting A Good Frames: CRC Errors: Alignment Errors: Runt Frames: Long Frames: Bad Frames: Total Frames: Port Collisions: Late Collisions: Short events: Port Partitions: Data Rate Mismatches: 100 |###################### 16 |#### 0 | 3 |# 1 | 20 |###### 120 |##################### 6 |## 0 | 0 | 0 | 0 | --------------------------- All of the module-wide s
CentreCOM 3600 Series Hub/Repeaters Note Individual Port Statistics The same information is displayed on a standalone AT-3600 when you choose an individual statistics counter from the main Hub Statistics Menu.
Management Menus Administration Menu If you select Administration from the Main Menu, the following menu will appear: 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 The Module name option does not appear in a standalone configuration.
CentreCOM 3600 Series Hub/Repeaters You may enter a new name for the hub, up to 20 characters in length, or press RETURN to keep the existing symbolic name. To delete an existing name, enter one or more space characters (blanks) and then press RETURN.
Management Menus Once you press RETURN, you will see the following Timeout display: Sunnyvale Module 1—Accounting A The current timeout is: 0 Please enter a new timeout value, or Return to retain the existing one. Enter number of minutes, or zero to disable the timeout -> The timeout option will automatically end the session if there is no activity for the length of time specified, in minutes. The default is “0,” which disables the timeout function.
CentreCOM 3600 Series Hub/Repeaters Subnet Mask Enter the net/subnet mask using decimal notation, as shown: Sunnyvale The current Subnet Mask 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: 128.9.3.
Management Menus ‘Get’ Community String Enter the SNMP Community String for the SNMP ‘Get’ 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: -> ‘Set’ Community String Enter the SNMP Community String for the SNMP ‘Set’ function. The default value is “private.
CentreCOM 3600 Series Hub/Repeaters Download Password Enter the password for the hubs to be downloaded. Sunnyvale The current Download Password is: AT3600 Please enter a new value, or RETURN to retain the existing one: -> Location String Enter the desired SNMP ‘Location’ string. This string is displayed by SNMP management stations and is intended to identify the physical location of the AT-3600 within your facility.
Management Menus Terminal Configuration Menu If you select Terminal configuration from the Administration Menu, the following new menu will appear: Sunnyvale Please select an option: > ANSI—VT100—compatible Generic “dumb” terminal Custom terminal definition > 8 data bits 7 data bits 1 stop bit > 2 stop bits No parity > Odd parity Even parity > Full duplex (echo) Half duplex (no echo) Data rate (“baud” rate)...
CentreCOM 3600 Series Hub/Repeaters Terminal Type ANSI. The ANSI option “auto configures” the management agent for the characteristics of an ANSI-standard terminal (essentially the same as a DEC VT-100 or similar). Generic. The Generic terminal option configures the management agent for the simplest possible terminal type. In this configuration, the management agent makes very few assumptions about the terminal’s capabilities and is compatible with almost all terminal types (see Table 4 on page 22).
Management Menus The first sequence to be configured is the “home cursor” sequence: Enter the control sequence to HOME THE CURSOR This sequence must move the cursor to the upper-left corner of the screen. 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.
CentreCOM 3600 Series Hub/Repeaters Finally, you enter the “erase to end-of-line” sequence: Enter the control sequence to ERASE TO END-OF-LINE This sequence 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.
Management Menus Language Menu When you select the Language option from the Main Menu, a new menu displays the following choices: Note The Language option only appears when AT-S4 Firmware Cassette is installed in the Master.
CentreCOM 3600 Series Hub/Repeaters All other menus are then shown in the newly selected language.
Management Menus Download Menus Update Selected Node If you select Send updated software to another hub from the Administration Menu, you are prompted to select an individual repeater node to download with new software: Sunnyvale The Hub to be downloaded may be identified by name (‘Hub name’), by IP address (128.2.3.4), or by Ethernet address (0000F4 123456).
CentreCOM 3600 Series Hub/Repeaters Department concentrator reconfiguration messages appear as follows: Sunnyvale modulexAAAAA is now On Line. modulexAAAAA has been removed! modulexAAAAA has failed! Port reconfiguration messages appear as follows: 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.
Management Menus If the Master detects the presence of a Slave that is not running the same version of the software, it displays the message: Sunnyvale Updating software in modulex If an unrecognized type of TFTP request is received, the following message appears: Sunnyvale TFTP request received from node >: Implied request ignored The symbol > denotes the IP address of the requesting node, in dotted decimal notation.
CentreCOM 3600 Series Hub/Repeaters Diagnostics The Administration Menu Diagnostics option enables you to run a limited set of diagnostic tests on the currently selected module’s functionality. When you select this option, the management agent performs diagnostic tests and displays the results as follows: Sunnyvale Module 1—Accounting A Allied Telesyn AT-3612T Serial Number 0000F4 001122 AT-S4 Advanced AT-3600 Hub Manager: 2.
Management Menus This option initiates an outbound (Telnet) session to another AT-3600 Series Repeater (you can do this whether or not you have loaded IP addresses). This option is useful when you are managing remote networks. With a modem attached to the RS232 port of one of the 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.
Chapter 5 Fault Tolerance As previously mentioned, you can cluster multiple AT-3600 Series Repeaters in the same chassis, where they will all operate together as a single logical concentrator. You manage the entire department concentrator (via the management agent) from the Master AT-3600 module. Modules are numbered from 1 through 8, top to bottom, in the chassis. The Master is defined to be the module in the lowest numbered (physically the topmost) occupied slot position.
Fault Tolerance If you remove the Master, role determination will cause the Backup to take over as the new Master. The module below the old Backup (now the new Master) will take on the role of a new Backup. This process will repeat again if the new Master is itself removed. Similarly, removing a Backup will cause a new module to take over as Backup.
CentreCOM 3600 Series Hub/Repeaters When a Backup takes over on behalf of a failed or removed Master, it already has a current copy of all necessary configuration data. When you swap out the failed Master and install a new module, the new Master will receive correct and current configuration data from the Backup (previous Master). This avoids the need to respecify all of the configuration preferences. The process all happens transparently within seconds of the swapout.
Fault Tolerance 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.
Chapter 6 SNMP Management Overview AT-3600 Series Repeaters contain an SNMP agent that enables the hub to respond to interrogations from an SNMP Network Management Console (NMC). The NMC consists of a workstation (MS-DOS, UNIX, etc.) running an SNMP management application program. The NMC is the Network Manager’s interface to the various SNMP-capable devices on the network. SNMP Commands The SNMP command set consists of only three commands; GET, GET NEXT and SET.
SNMP Management There are many MIBs in the SNMP realm. Each MIB is defined in a document called a Request For Comments (RFC). The MIB structure is defined in RFC 1066. Supersets of the MIB are defined in subsequent RFCs. Some common MIBs are: ❑ ❑ ❑ ❑ ❑ MIB I—This MIB contains a general or core set of variables that are related to physical network properties such as interface statistics and IP, TCP and UDP statistics.
Appendix A Data Cabling Techniques The following sections detail cabling techniques and port specifications for IEEE 802.3 media. For comprehensive treatment of these topics, refer to the original IEEE specification. 10BASE-T UTP (either RJ45 or Telco [RJ21]) links support transmissions up to 100 meters [328 ft.]) at 10 Megabit data rates. A serious problem exists concerning identification of modular cable. There are various grades of voice-quality and data-quality cables available.
Data Cabling Techniques Table 7 shows the five common modular cable specifications and their applicability to 10BASE-T network use.
CentreCOM 3600 Series Hub/Repeaters Pin 1 Figure 7: RJ45 Cable UTP MAU-to-MAU, Hub-to-Hub Wiring 10BASE-T MAU-to-MAU or hub-to-hub wiring generally requires a crossover cable located somewhere along the UTP cable run. This may commonly occur at the punch-down block or between the RJ45 wall receptacle and the workstation. See Figure 8.
Data Cabling Techniques Table 8 shows which position the straight-through/crossover selection switch needs to be for the device configuration shown. Table 8: MDI and MDI-X Switch Settings for Common Connection1 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.
CentreCOM 3600 Series Hub/Repeaters If you pair pins incorrectly, for example as shown in Figure 9, Diagram B, your network may have a high data error rate. In a straight-through cable, the transmit pins, 1 and 2, are paired, as are the receive pins, 3 and 6. In a crossover cable (Figure 8), pins 1 and 2, TD+ and TD-, are paired, as are pins 3 and 6, RD+ and RD-.
Appendix B Glossary 10BASE2—Also called thinnet Ethernet, thinnet or CheaperNet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment length is 185 meters (607 ft.). 10BASE5—Also called thick Ethernet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment is 500 meters (1,640 ft.). The cable is commonly referred to as yellow cable. Thick Ethernet cable is typically used as a trunk or backbone path of the network. 10BASE-FL—IEEE 802.
Glossary BAYONET NUT COUPLE (BNC) CONNECTOR—A 10BASE2 thin coax connector with push-on BNC locking lug that quickly locks into place with a half twist. BIT RATE (BR)—The rate of data throughput on the medium in bits per second. Ethernet specifies 10 million bits per second. BIT TIME—The duration of one bit symbol (1/BR). Ethernet specifies a bit time of 100 ns. CARRIER SENSE—In a LAN, an ongoing activity of a data station to detect whether another station is transmitting.
CentreCOM 3600 Series Hub/Repeaters DEPARTMENT CONCENTRATOR—Hub that provides a large number of workstation connections. The term department concentrator refers to multiple repeaters housed in an AT-36C8 chassis. See Hub/Repeater, Repeater. DIX CONNECTOR—See D-Sub Connector FOIRL — A fiber optic standard that allows up to 1,000 meters (3,280 ft.) of multimode duplex fiber optic cable in a point-to-point link.
Glossary LINK TEST—In 10BASE-T Ethernet there is a link test function that validates the UTP link. This consists of a pulse transmitted from point A on one pair that is validated at point B. Point B also transmits a pulse on the second pair to be validated by point A. These pulses occur during media idle states (in between packets). MANAGED MODULE— An intelligent repeater in a department concentrator chassis that makes management data available to the Master.
CentreCOM 3600 Series Hub/Repeaters POLARITY CORRECTION—Many 10BASE-T UTP ports have a polarity correction function. If the UTP wiring has RD- and RD+ inadvertently crossed, the polarity correction function will sample the signal and electrically swap the wires. If the TD- and TD+ wires are crossed, the correction would occur at the MAU on the other end of the UTP link. This occurs within a single pair and should not be confused with the crossover cable.
Glossary TCP/IP PROTOCOLS—A set of protocols for intercomputer communication, including network level (Internet Protocol), transport level (Transmission Control Protocol or TCP) and application level protocols (for example, Telnet terminal emulation). TCP/IP has been used for many years in two country-wide networks, the ARPANET and MILNET. Recently, TCP/IP has become very popular with users of a variety of multi-user computer systems and engineering workstations.
Appendix C Technical Support Fax Order Name ___________________________________________________________________ Company ________________________________________________________________ Address _________________________________________________________________ City ____________________State/Province____________ Zip/PostalCode __________ Country _________________ Phone __________________Fax ____________________ Incident Summary Model number of ATI product I am using ______________________________________ Fi
Appendix D CentreCOM AT-3600 Network Operations Manual Feedback Please tell us what additional information you would like to see discussed in the manual. If there are topics you would like information on that were not covered in the manual, please photocopy this page, answer the questions and fax or mail this form back to Allied Telesis. The mailing address and fax number are at the bottom of the page. Your comments are valuable when we plan future revisions of the manual.
Appendix E Index Numerics C 10BASE5 (thick) AUI drop cables 65 10BASE-T MDI/MDI-X switch 63 UTP hub-to-MAU wiring 62 UTP MAU-to-MAU, hub-to-hub wiring 63 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 cascad
Index D-sub 68 N-series 70 RJ21 3, 61 RJ45 3, 61, 62, 67, 69, 71 RS232 6, 54 Telco 50-pin 3 cover panels AT-3612TR 2 current status link state 31 partitioning 31 polarity 31 D data communication equipment (DCE) 19, 62, 68 data set ready (DSR) 20 data terminal equipment (DTE) 19, 68 data terminal ready (DTR) 20 datalink (MAC) layer path 18 datalink layer propagation device 18 DB9 19 department concentrator 67, 69 download download all nodes 50 update selected node 50 DTE 62, 65, 67 dumb 21, 22 duplex full 2
CentreCOM 3600 Hub/Repeaters M MAC address 53 main main 33 menu 29 managed module 70 management 60 information base 59 network 5 omega 2, 5, 15, 16, 18, 22, 23, 33 overview 59 port status update 29 RS232 5, 6, 15, 19, 21, 24 SNMP 5 SNMP commands 59 SNMP, BRIDGE MIB 60 SNMP, MIB I 60 SNMP, MIB II 60 SNMP, PRIVATE MIB 60 SNMP, REPEATER MIB 60 telnet 5, 6 management agent 25, 70, 71 ending a session 26 installation 16 interface 21 languages 25 management agent 70 re-installation 17 selecting menu options 25 s
Index O omega remote 6 options change port name 32 enable partitioning 31 individual port overview 35 link state 31 module overview 35 module statistics counters 35 polarity correction 31 reconnection 31 zero counters 32, 35 P patch panel 70 per-port counters 23 alignment errors 23 bad frames 23 CRC errors 23 data rate mismatches 23 good frames 23 late collisions 23 long frames 23 port collisions 23 port partitions 23 runts 23 short events 23 total frames 23 Physical Medium Attachment (PMA) 70 Physical Sig
CentreCOM 3600 Hub/Repeaters TFTP 52 trap 59 trivial file transfer protocol (TFTP) 18 U unique hub 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 81
Appendix F Where To Find Us For Technical Support or Service Location Phone Fax North America United States, Canada, Mexico, Central America, South America, Australia, New Zealand 1 (800) 428-4835 1 (206) 481-3790 France France, Belgium, Luxembourg, The Netherlands, Middle East, Africa (+33) 1-69-28-16-17 (+33) 1-69-28-37-49 Germany Germany, Switzerland, Austria, Eastern Europe (+01) 30-83-56-66 (+49) 30-435-70-650 Italy Italy, Spain, Portugal, Greece, Turkey, Israel (+39) 2-416-047 (+39) 2-4
