Instruction/ maintenance manual of the product 42T Cabletron Systems
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MICR OMMA C-22T/24T/42T/44T ST A CKABLE T OKEN RING INTELLIGENT HUBS USER’S GUIDE.
iii NO TICE Cabletron Systems reserves the right to make 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.
NO TICE iv FCC NO TICE This device complies with P art 15 of the FCC rules. Operation is subject to the following two conditions: (1) this de vice may not cause harmful interference, and (2) this device must accept any interference recei ved, including interference that may cause undesired operation.
NO TICE v CABLETR ON SYSTEMS, INC. PR OGRAM LICENSE A GREEMENT IMPOR T ANT : Before utilizing this product, carefully read this License Agreement. This document is an agreement between you, the end user , and Cabletron Systems, Inc.
NO TICE vi 2. NO LIABILITY FOR CONSEQ UENTIAL D AMA GES. IN NO EVENT SHALL CABLETR ON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMA GES WHA TSOEVER (INCLUDING, WITHOUT LIMIT A TION, DAMA GES FOR LOSS OF BUS.
vii CONTENTS CHAPTER 1 INTRODUCTION 1.1 CONTENTS O VER VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 MicroMMA C-T O VER VIEW . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.3 MicroMMA C-T FEA TURES . . . . . . . . . . . . . . .
CONTENTS viii 3.5 RESETTING THE MICROMMA C-T . . . . . . . . . . . . . . . . . . 3-5 3.6 SETTING THE RING SPEED . . . . . . . . . . . . . . . . . . . . . . 3-6 3.7 SETTING THE NVRAM SWITCH . . . . . . . . . . . . . . . . . . . 3-7 3.8 CONNECTING LOBE POR T CABLING .
CONTENTS ix 5.2.4 Sa ved System Messages . . . . . . . . . . . . . . . . . . . . 5-6 5.3 VIEWING PO WER UP DIAGNOSTIC TESTS . . . . . . . . . . 5-7.
1-1 CHAPTER 1 INTR ODUCTION W elcome to the Cabletron Systems MicroMMA C-22T/-24T/-42T/ -44T Stackable T oken Ring Intelligent Hub User’ s Guide . This manual provides installation instructions, netw ork requirements, reference information, and operating instructions for the MicroMMA C-T (Figure 1-1) family of stackable hubs.
INTRODUCTION 1-2 describes ho w to install a TPIM and concludes with installation check-out instructions. Chapter 4, Local Management , explains ho w to set up and use a management terminal and a modem to access Local Management.
INTRODUCTION 1-3 Figure 1-2. T ypical MicroMMA C-T Configuration Scenario All MicroMMA C-Ts are functionally and physically identical except for the number and type of their T runk Connection Unit (TCU) lobe ports.
INTRODUCTION 1-4 Active TCU P or ts The active TCU ports re generate, reshape, and filter the incoming signal, permitting UTP lobe cable lengths of up to 120 meters and STP lobe cable lengths up to 150 meters at 16 Mbps ring speed.
INTRODUCTION 1-5 re-time all data. Cabletron of fers a v ariety of TPIMs for RI/R O trunk connections as sho wn in T able 1-1. Ring Speed Switch Use the Ring Speed Switch to select either 4 or 16 Mbps ring speed.
INTRODUCTION 1-6 numerous management de vices and serve as their management data representati ve. The network management station then has to query only one management de vice, the MicroMMA C-T in DLM mode, to access management data for all management de vices on the network.
INTRODUCTION 1-7 • T oken Ring FNB (Flexible Netw ork Bus) • DO T 5 Logical and Physical • UPS (Uninterruptible Po wer Supply) • De vice • DLM (Distributed LAN Monitor) • PIC MIB (Product .
INTRODUCTION 1-8 1.4 ST A CKABLE CAP ABILITIES The MicroMMA C-T can be stacked with up to four HubST ACK STH series non-intelligent hubs as sho wn in Figure 1-3. Four connectors are av ailable on the back panel of the MicroMMA C-T for connecting STH 12/24 type non-intelligent hubs.
INTRODUCTION 1-9 Figure 1-3. T ypical Stackable Configuration NO TE : T oken Ring HubST ACK Interface cables, which ar e used to connect between the Micr oMMAC-T and stacked STH hubs, ar e not included with the Micr oMMAC-T . 1.5 BRIDGING/ROUTING CAP ABILITIES A slot on the back panel of the unit provides installation access for BRIMs to the hub .
INTRODUCTION 1-10 . 1.5.1 SNA/W AN Integration The MicroSN A C add-on daughterboard provides two ports, both of which can be used to provide con version from SN A/SDLC or BSC links to LLC2. The MicroSN A C can operate in a con verter mode or as a W AN concentrator .
INTRODUCTION 1-11 module. This feature complements the remote SNMP management and allo ws for quick hub configuration changes or checks. 1.8 RECOMMENDED READING The follo wing publications provide more information on T ok en Ring network implementation.
2-1 CHAPTER 2 REQUIREMENTS/SPECIFICA TIONS Read this chapter prior to installing the MicroMMA C-T . It contains operating specifications and requirements for po wer and cabling. T o obtain satisfactory performance from this equipment, networks must meet the requirements and conditions specified in this chapter .
REQUIREMENTS/SPECIFICA TIONS 2-2 2.1.1 UTP Cable Specifications The MicroMMA C-22T and MicroMMA C-24T lobe ports and the TPIM-T2 support voice grade Unshielded T wisted Pair (UTP) cable, as described in specifications for EIA/TIA TSB 568 and IBM T ype 3 cable.
REQUIREMENTS/SPECIFICA TIONS 2-3 Maximum Lobe Lengths Lobe length is the physical length of the cable connecting a station to its TCU port at the MicroMMA C-T . T able 2-2 lists the maximum lobe cable length for ring speeds of 4 and 16 Mbps. The v alues listed refer to total lengths made up of UTP cable only .
REQUIREMENTS/SPECIFICA TIONS 2-4 2.1.2 STP Cable Specifications MicroMMA Cs 42T and 44T and TPIMs T1 and T4 support IBM T ype 1, 2, 6, and 9 STP cabling as described belo w: • IBM T ype 1: T wo STP lengths of 22 A WG solid wire for data. Used for the longest cable runs within building w alls of buildings.
REQUIREMENTS/SPECIFICA TIONS 2-5 cable length for ring speeds of 4 and 16 Mbps. The cable lengths listed in T able 2-4 refer to total lengths made up of STP cable only . Maximum T runk Lengths The maximum trunk cable length between the MicroMMA C-T and other acti ve de vices is equal to the maximum driv e distance as shown in T able 2-5.
REQUIREMENTS/SPECIFICA TIONS 2-6 Mixed Cable T ypes If multiple cable types exist in netw ork, compensations must be made for the dif ferent cable attenuations. T ype 6 and T ype 9 cables can run only 2/3 the distance of T ype 1. Therefore 10 meters of T ype 1 ≈ 6.
REQUIREMENTS/SPECIFICA TIONS 2-7 Fiber Optic Budget The fiber optic delay budget, which determines the fiber optic cable’ s maximum length, should be calculated and taken into consideration in the network design stage.
REQUIREMENTS/SPECIFICA TIONS 2-8 Fiber Optic Budget The fiber optic delay budget, which determines the fiber optic cable’ s maximum length, should be calculated and taken into consideration in the network design stage.
REQUIREMENTS/SPECIFICA TIONS 2-9 Other Considerations In addition to complying with the preceding cable specifications, the follo wing recommendations should be follo wed to minimize errors and obtain optimum performance from the network: • UTP cabling should be free of splices, stubs, or bridged taps.
REQUIREMENTS/SPECIFICA TIONS 2-10 Local Management Both COM 1 and COM 2 ports are factory-configured to support Local Management access by an actual or emulated Digital Equipment Corporation VT 100™ terminal.
REQUIREMENTS/SPECIFICA TIONS 2-11 Figure 2-3. TPIM-T1 Pinouts TPIM-T2 TPIM-T2 provides an RJ45 connector that supports UTP cabling. Figure 2-4 sho ws pinouts for Ring Out and Ring In applications. Figure 2-4. TPIM-T2 Pinouts TPIM-T4 TPIM-T4 is an RJ45 connector that supports STP cabling.
REQUIREMENTS/SPECIFICA TIONS 2-12 Figure 2-5. TPIM-T4 Pinouts TPIM-F2 TPIM-F2, sho wn in Figure 2-6, provides an ST connector that supports Multimode fiber Optic cabling. Figure 2-6. TPIM-F2 NO TE : T ransmitter power and r eceive sensitivity levels, shown in T able 2-8, ar e Peak Power Levels after optical overshoot.
REQUIREMENTS/SPECIFICA TIONS 2-13 . TPIM-F3 TPIM-F3, sho wn in Figure 2-7, is an ST connector that supports Single Mode fiber Optic cabling. Figure 2-7. The TPIM-F3 T able 2-8. TPIM-F2 Specifications. Parameter Typical V alue W orst Case W orst Case Budget T ypical Budget Receiv e Sensitivity -30.
REQUIREMENTS/SPECIFICA TIONS 2-14 NO TE : T ransmitter Power decr eases as temperatures rise and incr eases as temperatur es fall. Use the Output Power Coefficient to calculate incr eased or decr eased power output for an operating envir onment. For example, the typical power output at 25 ° C is -16.
REQUIREMENTS/SPECIFICA TIONS 2-15 to the average power measurement to corr ectly compare the average power values measured to the values listed above (i.
REQUIREMENTS/SPECIFICA TIONS 2-16 Non-operating T emperature: -30 ° to +90 ° C Operating Humidity: 5 to 95% (non-condensing) 2.5.3 Safety This unit meets the safety requirements of UL 1950, CSA C22.2 No. 950 and EN 60950; the EMI requirements of FCC Class A and EN 55022 Class A; and the EMC requirements of EN 50082-1.
3-1 CHAPTER 3 INST ALLA TION This chapter outlines MicroMMA C-T installation and network connection procedures. Be sure that the network meets the guidelines and requirements outlined in Chapter 2, Requirements/Specifications , before installing the MicroMMA C-T .
INST ALLA TION 3-2 Figure 3-1. Attaching the Strain Relief Bracket 3.3 INST ALLING THE Micr oMMA C-T The MicroMMA C-T can be rack-mounted, wall-mounted, or placed on any horizontal surf ace. Refer to the follo wing subsections for the appropriate installation instructions.
INST ALLA TION 3-3 2. Using the four cov er screws remov ed in step 1, attach the rack-mounting brackets to each end of the MicroMMA C-T . Figure 3-2. Installing of Rack-Mount Brac kets 3.
INST ALLA TION 3-4 Figure 3-4. W all-Mounting the MicroMMA C-T 2. Select a wall location within se ven feet of a po wer outlet for the MicroMMA C-T . W ARNING : When drilling pilot holes, any electrical wiring inside the wall may pr esent a potential SHOCK HAZARD .
INST ALLA TION 3-5 3.3.3 Free-Standing Installation For a free-standing shelf or table top installation, locate the MicroMMA C-T , as sho wn in Figure 3-5, within 7 feet of its po wer source on an unrestricted free surface area 21 inches wide, 18 inches deep, and 6 inches high.
INST ALLA TION 3-6 T o reset the MicroMMA C-T : Insert a small pointed-tip object (e.g., ballpoint pen) into the recessed reset button hole, press the b utton once, and then release. Figure 3-6. The Reset Button 3.6 SETTING THE RING SPEED The ring speed switch is located on the front face of the MicroMMA C-T as sho wn in Figure 3-7.
INST ALLA TION 3-7 Figure 3-7. The Ring Speed Switch 3.7 SETTING THE NVRAM SWITCH Figure 3-8 sho ws the location of the NVRAM Reset Switch. It can be reached by a inserting a small scre wdriv er through the side vent. NVRAM (Non-V olatile Random Access Memory) stores user-entered parameters such as IP address and de vice name.
INST ALLA TION 3-8 2. Press the MicroMMA C-T’ s Reset button. Once the module is reset, use the factory-default settings or enter ne w parameters. The MicroMMA C-T stores these settings in NVRAM during normal operation and during po wer down until the reset switch is toggled again.
INST ALLA TION 3-9 RJ45 Plug to RJ45 Plug (at TCU) (at device port) Pin 3 (Recei ve -) . . . . . . . . . to . . . . Pin 3 (T ransmit -) Pin 4 (T ransmit +) . . . . . . . . to . . . . Pin 4 (Receiv e +) Pin 5 (T ransmit -) . . . . . . . . . to . . . . Pin 5 (Recei ve -) Pin 6 (Recei ve +) .
INST ALLA TION 3-10 Figure 3-10. UTP Configuration Example Punchdown Block WIRING CLOSET OFFICE T oken Ring Station T oken Ring Network Interface Card W all Jack UTP Lobe Cable W ALL MicroMMAC-24T TR.
INST ALLA TION 3-11 Figure 3-11. STP Configuration Example T o attach a lobe segment to a MicroMMA C-T netw ork por t: 1. Insert the RJ45 connector from each twisted pair segment into an RJ45 network lobe port on the MicroMMA C-T , as shown in Figure 3-12.
INST ALLA TION 3-12 2. The associated Port Status LED lights green when the station boots up. If the LED doesn’t light, perform the follo wing steps: a. Check that the device at the other end of the twisted pair segment has po wer , and that the network interface dri ver is initialized.
INST ALLA TION 3-13 3.9.1 Setting Phantom and RI/RO Switc hes The Phantom Switch (sho wn in Figure 3-13) enables the port to “auto wrap” if a trunk cable fails or is remo ved. The Phantom Switch should be set to the appropriate setting before TPIM installation.
INST ALLA TION 3-14 Figure 3-13. The Phantom and RI/RO Switches 3.9.2 TPIM Installation T o install a TPIM, perform the f ollowing steps: CA UTION : Observe all static pr ecautions while handling TPIMs. 3. Remov e the mounting screw from the faceplate of the RI/R O port on the MicroMMA C-T .
INST ALLA TION 3-15 Figure 3-14. Installing a TPIM 3.9.3 Connecting STP Segments Use TPIM-T1 to connect STP se gments. Before connecting a segment to the TPIM-T1, confirm proper pinouts at each end of the se gment. T o connect a TPIM-T1 to a T wisted P air Segment: 1.
INST ALLA TION 3-16 Figure 3-15. The TPIM-T1 2. Check that the LNK LED on the TPIM lights green. If the LED is red or is not lighted, perform each of the follo wing steps: a. Check that the device at the other end of the segment has po wer . b . V erify that the DB9 connector is pinned properly .
INST ALLA TION 3-17 Figure 3-16. The TPIM-T2/-T4 2. Check that the LNK LED on the TPIM lights green. If the LED lights red or is not lit, perform each of the follo wing steps: a. Check that the device at the other end of the segment has po wer . b . V erify that the RJ45 is pinned properly .
INST ALLA TION 3-18 • The physical communication link consists of two strands of fiber optic cabling. The T ransmit strand (TX) at one end connects to the Recei v e (RX) port at the other end and vice versa.
INST ALLA TION 3-19 a. Check that the device at the other end of the link has po wer . b . V erify that the fiber strands are properly “crossed-over” between the ports on the module and on the fiber optic de vice at the other end of the fiber optic link segment.
4-1 CHAPTER 4 LOCAL MANA GEMENT This chapter explains ho w to set up a management terminal and a modem to access MicroMMA C-T’ s Local Management (LM). It also explains ho w to use Local Management tools to manage the MicroMMA C-T , its components, and its attached segments (i.
LOCAL MANA GEMENT 4-2 Cabletron supplies an RJ45 Cable Kit with the MicroMMA C-T . This kit includes a UTP console cable with RJ45 connectors on each end. It also provides adapters for DB9 or DB25 connections. Refer to the RJ45 Cable Kit Instruction Sheet for adapter pinouts and additional instructions.
LOCAL MANA GEMENT 4-3 When you hav e finished attaching and setting up the terminal, you can access Local Management. 4.1.3 Modem Cable Configuration and Setup T o access Local Management from a modem, use an RS-232 cable av ailable from Cabletron Systems.
LOCAL MANA GEMENT 4-4 MicroMMA C-T’ s COM 2 port. Figure 4-2 shows the pinout for a cable with an RJ45 connector at the MicroMMA C-T end of the cable. Figure 4-2. Modem Cable Pinouts 4.2 A CCESSING LOCAL MANA GEMENT T o access Local Management: 1. T urn on the display terminal and then press the Return k ey .
LOCAL MANA GEMENT 4-5 Figure 4-3. MicroMMA C-T Local Management Screen 2. Enter the Passw ord (the factory default passw ord is the Return key ) and then press the Return k ey . If your password is in v alid, the cursor returns to the beginning of the password field; otherwise, the MAIN MENU screen appears.
LOCAL MANA GEMENT 4-6 4.2.2 Accessing Local Management from a Modem 1. T urn on the modem. The modem must be set for Auto Answer and Data Carrier Detect must be acti ve. Refer to your modem’ s user manual for operating instructions. 2. Call the modem.
LOCAL MANA GEMENT 4-7 Figure 4-4. Local Management MENU Screens Hierarch y NO TE : Local Management automatically disconnects after 15 minutes of keyboar d inactivity . T o pr event disconnection, press any key during periods of inactivity . If you ar e disconnected, just pr ess Return to r e-access the LM passwor d scr een.
LOCAL MANA GEMENT 4-8 (or other procedures where they are described) when w orking with LM screens: 1. Use the T ab key or arrow k eys to highlight the parameter(s). 2. Use the spacebar to toggle through settings for fields of fering selections; type settings ov er fields that you can edit or type over .
LOCAL MANA GEMENT 4-9 4.3.2 The SYSTEM LEVEL Screen The SYSTEM LEVEL Screen (Figure 4-5) displays and lets you set the follo wing parameters: • IP Address, • Subnet Mask • System Date • System.
LOCAL MANA GEMENT 4-10 1. Highlight the System Date field. 2. T ype the date into the field in a MM/DD/YY format and then press the Return k ey . 3. If the format is in valid, the message “INV ALID D A TE” appears. Re-type the date using the correct format.
LOCAL MANA GEMENT 4-11 3. Press the Return k ey . The ne w v alue appears in the IP Address field. 4. If the IP Address is correct, highlight the SA VE command and then press the Return k ey . The “SA VED” message appears on the screen indicating that your changes hav e been saved to memory .
LOCAL MANA GEMENT 4-12 The “SA VED” message appears on the screen indicating that your changes hav e been saved to memory . The MicroMMA C-T will then do a soft reset. Setting the Default Gatewa y The Default Gate way is the IP address of the network connection (e.
LOCAL MANA GEMENT 4-13 ABRP locates the problem and corrects it, the MicroMMA C-T generates traps to provide the netw ork’ s designated remote management station with information regarding the incid.
LOCAL MANA GEMENT 4-14 2. T oggle between ENABLED and DISABLED to make your selection. 3. Highlight the SA VE command and then press the Return k ey . The “SA VE” message appears on the screen indicating that your selection was sa ved to memory and the new v alue of the field takes ef fect.
LOCAL MANA GEMENT 4-15 serve tw o purposes: they act as passw ords to Local Management (LM) and control SNMP management access to the MicroMMA C-T . Y ou control MicroMMA C-T access by establishing ac.
LOCAL MANA GEMENT 4-16 Community Name This field displays designated user names. Access P olicy This field displays the access pri vileges accorded to each community name. Editing the Community Name field 1. Highlight the Community Name field. 2. T ype in the password, up to 32 characters in length, into the field.
LOCAL MANA GEMENT 4-17 Figure 4-7. SNMP TRAPS Screen The follo wing sections discuss the fields on the SNMP TRAPS Screen and provide instructions for using them. T rap Destination This field sho ws the IP Address of the workstation that recei ves traps from the MicroMMA C-T .
LOCAL MANA GEMENT 4-18 3. Press the Return k ey . If the format is in valid, the “INV ALID IP FORMA T” message appears. Re-type the T rap Destination IP address using the correct format. 4. Highlight the T rap Community Name field. 5. Enter the community name of the de vice to recei ve traps and then press the Return key .
LOCAL MANA GEMENT 4-19 Figure 4-8. RING SECURITY Screen Only stations on the ring’ s allo wed list can enter the ring. The MicroMMA C-T retains this allowed list and automatically re-enables ring security whene ver you po wer up or reset the unit. Y ou can select from two modes of ring security: • Alarm Only • Alarm/Remov e.
LOCAL MANA GEMENT 4-20 In Alarm/Remov e mode, the MicroMMA C-T sends a “Remove MA C Frame Command” to ne w stations attempting to enter the ring. A trap sent to the NMS informs it of the action taken.
LOCAL MANA GEMENT 4-21 it sends a trap to the NMS informing it that the station could not be remov ed. The station must then be physically remov ed from the ring. SA VE/EXECUTE Use this field to sav e changes made to ring security in the MicroMMA C-T’ s NVRAM.
LOCAL MANA GEMENT 4-22 2. Highlight the SA VE/EXECUTE command and then press the Return key . Viewing the Re vised Allowed List 1. Highlight the RETURN command and then press the Return k ey . The SETUP MENU scr een appears. 2. Highlight RING SECURITY and then press the Return k ey .
LOCAL MANA GEMENT 4-23 4.3.6 The DEVICE ST A TISTICS Screen The DEVICE ST A TISTICS screen (Figure 4-9) displays ring information, isolating errors, and non-isolating errors. Figure 4-9. DEVICE ST A TISTICS Screen The follo wing sections discuss the fields on the DEVICE ST A TISTICS screen and provide instructions for using them.
LOCAL MANA GEMENT 4-24 • TOT A L : This mode automatically displays statistics describing network performance since the last po wer-up. Selecting the Device Statistics Counter Mode 1. Highlight the current mode at the bottom of the screen and toggle to a counter mode selection.
LOCAL MANA GEMENT 4-25 KBytes Received This field displays the sum in kilobytes of frames recei ved by the MicroMMA C-T . Errors Recei ved This field displays the Isolating and Non-Isolating Errors (described belo w) detected on the ring. Beacon States This field displays the beacon conditions detected on the ring.
LOCAL MANA GEMENT 4-26 occurs when stations enter or leav e the ring with the absence of phantom current. This error can also indicate a problem with the recei ver of the reporting node, or the transmitter of its N A UN, or the cabling and hub hardware between them.
LOCAL MANA GEMENT 4-27 • Closed -- Indicates that the management station has closed the adapter • Normal -- Indicates the ring is running with no problems, and tokens are being detected by the management station • Purge -- Indicates that the acti ve monitor has issued a ring purge command.
LOCAL MANA GEMENT 4-28 Frame Copied Errors This field displays the total number of Frame Copied Errors. These errors occur when a station finds a frame with its address as the destination, but finds the address recognized indicator bits not set to zero.
LOCAL MANA GEMENT 4-29 • OPERA TION AL (Figure 4-10) -- Lets you monitor the operational status of the T oken Ring network • ADMINISTRA TIVE (Figure 4-11) -- Lets you manage access to the T oken R.
LOCAL MANA GEMENT 4-30 VFNB screen configurations for Bypassed modules are described as follo ws: • Bypassed ( |--B--| ): The MicroMMA C-T is in the bypass mode and is not connected to an STH module. • Bypassed left ( <--B--| ): The MicroMMA C-T or the STH is in the bypass mode, but it is connected to the ne xt module.
LOCAL MANA GEMENT 4-31 2. T oggle to a screen mode selection, or press a for ADMINISTRA TIVE, o for Operational, or r for RING OUT EN ABLE, and then press the Return k ey . The selected screen mode appears. Setting the REFRESH Field 1. Highlight the REFRESH3sec field.
LOCAL MANA GEMENT 4-32 • ENB (Enabled) : The port is enabled and allo ws an attached station to enter the ring. • BYP (Bypassed) : The port is disabled and the station is not on the ring.
LOCAL MANA GEMENT 4-33 Using the ADMINISTRA TIVE Mode Screen In addition to displaying the operational status of ring ports, the ADMINISTRA TIVE mode screen provides you with two methods for controlling access to them: • Bypassing ports. • Enabling and Disabling ports.
LOCAL MANA GEMENT 4-34 2. T oggle between ON and OFF , make your selection, and then press the Return k ey . Enabled ports provide access for other stations into the tok en ring network; disabled ports cannot pro vide access to the ring until they hav e been enabled.
LOCAL MANA GEMENT 4-35 Figure 4-12. CHASSIS ST A TUS VIEW (RING OUT ENABLE) Screen T o switch to and fr om STN and RO: 1. Highlight the port-status field sho wing STN or RO . 2. T oggle between STN and RO , make selection and then press the Return k ey .
LOCAL MANA GEMENT 4-36 Figure 4-13. COMPONENT ST A TUS VIEW Screen 4.3.9 The MIB NA VIGA T OR Screen The MIB N A VIGA TOR screen (Figure 4-14) pro vides the MIB N A VIGA TOR prompt where you can issue commands for na vigating and modifying the Management Information Base (MIB) structure.
LOCAL MANA GEMENT 4-37 Figure 4-14. MIB Navigator Screen The follo wing sections define MIB commands and describe ho w to get help on using them. T o access a list of MIB commands: T ype “help” or “?” at the MIB prompt and then press the Return key .
LOCAL MANA GEMENT 4-38 Navigational commands Navigational commands allo w you to access and manage MIB objects for the de vice. MIB Commands are described as follo ws: branch This command displays the object leav es of a specified directory tree. cd This command changes directories within a MIB sub-tree.
LOCAL MANA GEMENT 4-39 next This command sho ws the next leaf in a path. pwd This command displays the full path name of the directory in which you are working. set This command lets you set the v alue of a managed object. su This command lets you change your community name.
LOCAL MANA GEMENT 4-40 ping This command let you generate an outbound ping request. snmp branch This command lets you query another SNMP de vice. snmpget This command lets you query another SNMP de vice to obtain a v alue for an object. snmpset This command lets set the v alues of object in other de vices.
LOCAL MANA GEMENT 4-41 Figure 4-15. The FLASH DO WNLO AD Screen The follo wing sections discuss the fields on the FLASH DO WNLOAD screen and provide instructions for using them. Download Method field Use the Do wnload Method field to select either the R UNTIME or the BOO TPR OM download method.
LOCAL MANA GEMENT 4-42 The Reboot after Do wnload field appears by default when the R UNTIME method is used. If YES is selected, the MicroMMA C-T will automatically reset after the image is do wnloaded into Flash to load the ne w image into the acti ve system file.
5-1 CHAPTER 5 TR OUBLESHOO TING This chapter describes and explains ho w to use LANVIEW LEDs and the Liquid Crystal Display (LCD) to troubleshoot physical layer network problems. The chapter concludes with an o vervie w of the PO WER UP Diagnostic T est.
TROUBLESHOO TING 5-2 5.2 USING THE LCD DISPLA Y The MicroMMA C-T is equipped with an LCD and a LCD display button as sho wn in Figure 5-1. Figure 5-1. LCD Display The LCD is a diagnostic tool for vie .
TROUBLESHOO TING 5-3 5.2.1 Static System Messages Static System messages (T able 5-2) display MicroMMA C-T configuration information. T o view them, press and release the Display b utton (Figure 5-1). Press the Display button to scroll through each message.
TROUBLESHOO TING 5-4 5.2.2 Alarm Messages Alarm messages (T able 5-3) describe ev ents that occur within the MicroMMA C-T . T o vie w the Alarm Messages queue, press the Display button (Figure 5-1) and hold for fiv e seconds. Press the Display button to scroll through each message.
TROUBLESHOO TING 5-5 5.2.3 Unsaved Initialization Messa g es Unsav ed intialization messages appear on the LCD as the ev ent occurs, but are not sav ed in a buf fer for future recall. T able 5-4 lists unsav ed failure or error messages (If Failure or Error Messages appear , call your Cabletron T echnical Support representative.
TROUBLESHOO TING 5-6 5.2.4 Saved System Messa g es Sav ed System Message are device-related start-up or boot strap messages, BOO TP/TFTP host, or start-up error messages as shown in T able 5-6. T o access the Sav ed System Messages queue, enter the Saved Alarm Messages queue.
TROUBLESHOO TING 5-7 5.3 VIEWING PO WER UP DIA GNOSTIC TESTS The MicroMMA C-T runs from BootPR OM comprehensive booting and diagnostic tests of the de vice whene ver it has been started or reset. Y ou can vie w a chronicle of the tests and any error condition messages the y produce by connecting your terminal to the COM 2 port of the MicroMMA C-T .
TROUBLESHOO TING 5-8 • retry • loop Choosing continue, or c, lets you proceed with the remainder of the diagnostic test. Choosing retry , or r , lets you repeat the test that produced the error message.
POWER SUPPLY CORD The main cord used with this equipment must be a 2 conductor plus ground type with minimum 0.75 mm square conductors and must incorporate a standard IEC appliance coupler on one end .
An important point after buying a device Cabletron Systems 42T (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cabletron Systems 42T yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cabletron Systems 42T - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cabletron Systems 42T you will learn all the available features of the product, as well as information on its operation. The information that you get Cabletron Systems 42T will certainly help you make a decision on the purchase.
If you already are a holder of Cabletron Systems 42T, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cabletron Systems 42T.
However, one of the most important roles played by the user manual is to help in solving problems with Cabletron Systems 42T. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cabletron Systems 42T along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
