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xii

8239 Setup and User’s Guide

Summary of Contents for 8239 Token-Ring Stackable Hub

Page 1: ...8239 Token Ring Stackable Hub Setup and User s Guide GA27 4209 00...

Page 2: ......

Page 3: ...8239 Token Ring Stackable Hub Setup and User s Guide GA27 4209 00...

Page 4: ...ovided at the back of this publication If the form has been removed you may address your comments to International Business Machines Corporation Design and Information Development Department CGF P O B...

Page 5: ...eb Site xviii Chapter 1 Introduction and Planning 1 1 Models 1 1 Features 1 2 Configuration 1 3 Concentrator Functions 1 3 Device and Network Management 1 3 Cable Types and Distances 1 4 Ports 1 4 Sta...

Page 6: ...gnose Problems 5 1 Power Indicator 5 2 Box Status 5 2 Ring Speed 5 3 Port Status 5 3 RI RO Status 5 6 Stack In Stack Out Status 5 7 LCD and LED Codes 5 14 POST Codes 5 14 Operational Codes 5 15 Chapte...

Page 7: ...he 8239 Model 1 to Support the 802 5 MIB 8 2 Accessing 802 5 Information 8 2 MIB II RFC 1213 8 4 Configuring the 8239 Model 1 to Support MIB II 8 4 Accessing MIB II Information 8 4 Remote Monitoring R...

Page 8: ...vi 8239 Setup and User s Guide...

Page 9: ...tions to the 8239 2 4 2 4 Stack Building 2 5 2 5 Power on the 8239 2 7 3 1 16 Port Expansion Feature 3 1 3 2 RI RO Module 3 2 3 3 Cabling for the Optical Fiber RI RO Module 3 3 3 4 Cabling for the RJ...

Page 10: ...viii 8239 Setup and User s Guide...

Page 11: ...n Read this important safety information before using the 8239 Safety Information Booklet Danger Before you begin to install this product read the safety information in Caution Safety Information Read...

Page 12: ...uksen lue julkaisussa Varoitus Turvaohjeet Lue t m ensin SD21 0030 olevat turvaohjeet T ss kirjasessa on ohjeet siit miten s hk laitteet kaapeloidaan ja kytket n turvallisesti Danger Avant d installer...

Page 13: ...iniziare l installazione di questo prodotto leggere le informazioni relative alla sicurezza riportate nell opuscolo Attenzione Informazioni di sicurezza Prime informazioni da leggere in cui sono desc...

Page 14: ...e producto lea la informaci n de seguridad en Atenci n Informaci n de Seguridad Lea Esto Primero SD21 0030 Este documento describe los procedimientos de seguridad para cablear y enchufar equipos el ct...

Page 15: ...Der Hauptschalter zur Unterbrechung der Stromversorgung f r diese Einheit ist der Schalter der sich auf der R ckseite der Maschine befindet Die Maschine sollte daher so aufgestellt werden da dieser Sc...

Page 16: ...ul interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the ins...

Page 17: ...environment this product may cause radio interference in which case the user may be required to take adequate measures Zulassungsbescheinigung laut dem Deutschen Gesetz ber die elektromagnetische Vert...

Page 18: ...odel 1 contains a clock module that has an embedded lithium battery This battery is not replaceable Please dispose of this module in accordance with local ordinances Trademarks IBM and Nways are trade...

Page 19: ...Chapter 7 8239 Device Management on page 7 1 explains how to implement management of the device Chapter 8 Network Management on page 8 1 contains information about accessing network management data Ch...

Page 20: ...Visit our Web Site This IBM web page provides product information http www networking ibm com support xviii 8239 Setup and User s Guide...

Page 21: ...nt used by the stack units to communicate with each other The token ring data path connects the stack units into a shared token ring network for user traffic The 8239 is available in two models and pr...

Page 22: ...2 The 16 Port Expansion Feature can be installed in the feature slot of the 8239 RI RO Module Model 1 only Use the Ring In Ring Out Module RI RO Module to connect to another 8239 stack or to other com...

Page 23: ...nd 8239 Model 2s can make up a stack The 8239 provides address to port mapping information that identifies which MAC addresses are attached to which ports on the 8239 Fanout devices and MAC less devic...

Page 24: ...part without regard to the total distance among all 8239s in the stack If distances over 25m are required they are supported provided that the sum of all of the stack cable lengths minus the length of...

Page 25: ...P or STP A 750 m 2460 ft 375 m 1230 ft Optical Fiber RI RO Module The recommended maximum fiber length that can be used between Ring In and Ring Out fiber connections is 2 km 1 2 miles of 62 5 125 mic...

Page 26: ...t The rack must meet the requirements of ANSI EIA RS 310 C The 8239 requires 1 5 rack units Weight 8239 Model 1 7 0 kg 15 4 lb when empty 7 4 kg 16 4 lb when fully loaded 8239 Model 2 7 0 kg 15 4 lb w...

Page 27: ...requires input ac voltage within the range of 88 V ac to 265 V ac at a frequency of 47 Hz to 63 Hz The maximum power consumption of an 8239 that is fully populated with features is 85 W Chapter 1 Int...

Page 28: ...1 8 8239 Setup and User s Guide...

Page 29: ...cal ASCII terminal or to the terminal that is being used for remote access Verifying the Shipment After you have unpacked the shipping container use the following Inventory Checklist to verify that yo...

Page 30: ...top or installed in a customer supplied rack If you are installing this 8239 in a rack go to Rack Mounting the 8239 Otherwise continue with Surface Mounting the 8239 Surface Mounting the 8239 Place th...

Page 31: ...n to determine where in the rack to mount the 8239 4 Gather the rack mounting screws not provided and place them within reach 5 Hold the 8239 in position in the rack and start the lower of the two scr...

Page 32: ...section to connect cables to the 8239 and any attaching devices Connecting Stations to the 8239 Figure 2 3 Connecting Stations to the 8239 1 Refer to your network documentation to determine each cable...

Page 33: ...top 8239 to stack IN on the next hub below in the stack Figure 2 4 Stack Building 2 Using stack cables continue to connect stack OUT on each 8239 to stack IN on the next 8239 in the stack 3 Use the s...

Page 34: ...ng Emulation Software on page 4 1 5 Place the modem in auto answer mode 6 Set up the remote modem and data terminal 7 Establish a modem link as described in the modem user documentation Note Configura...

Page 35: ...switch the power on self test POST begins as soon as you plug in the power cord POST requires up to 2 minutes At the end of POST the LCD on the 8239 Model 1 shows the operational code version for abou...

Page 36: ...2 8 8239 Setup and User s Guide...

Page 37: ...om the 8239 4 Remove the 16 Port Expansion Feature from the 8239 by pulling on the thumb screws 5 If you are not replacing the 16 Port Expansion Feature immediately install an expansion slot cover Ins...

Page 38: ...ing a RI RO Module 1 Remove power from the 8239 by unplugging the power cord 2 If you intend to replace the RI RO Module label the cables attached to it This precaution will ensure that you reconnect...

Page 39: ...e 5 Connect the cables connecting RI on the 8239 RI RO Module to RO on the external device and RO on the 8239 RI RO Module to RI on the external device For the Optical Fiber RI RO Module Figure 3 3 Ca...

Page 40: ...e administratively disabled Use caution when implementing a network with more than one RI RO interface per stack Multiple RI RO connectors between two ring segments or between two 8239 Model 1s in the...

Page 41: ...cess can be saved only under Admin access The SAVE command is not allowed for User access The default login name is admin with no password It is recommended that you change the 8239 login password to...

Page 42: ...already powered on Diagnostic messages if you provide power after establishing the connection 3 Press Enter two or three times 4 At the login prompt type admin and then press Enter ADMIN is the defau...

Page 43: ...representing a command are not the same on the 8239 Model 1 and the Model 2 Pressing Tab selects the first command that matches what you typed Repeatedly pressing Tab cycles through the possible comm...

Page 44: ...ts on hub 1 Type enable port 1 all and press Enter Disable port 4 on hub 2 Type disable port 2 4 and press Enter Verifying Saving and Restoring Parameters Verifying Parameters To verify parameters tha...

Page 45: ...ram protocol internet protocol UDP IP based protocol that allows a 8239 Model 1 to obtain IP information with the assistance of a BOOTP server with the IP information the 8239 can use in band connecti...

Page 46: ...ation if appropriate using the SET COMMUNITY command Telnet does not require this information 2 Set the access control list information if appropriate using SET ACCESS ACCESS_CONTROL_LIST Note Because...

Page 47: ...ng segment number in order for the RMON source routing statistics to be accurate For information about setting the ring segment number see Enabling RPS on page 4 8 By default all RMON groups are enabl...

Page 48: ...pology change traps enable tr_surrogate crs_traps The default value for crs_traps is enabled Enabling RPS 1 Enable the surrogate group as explained in Enabling the Surrogate Group 2 Enable RPS using t...

Page 49: ...he value is provided by the product These parameters are accessible using the command interface or using SNMP through the 8239 MIB Parameter Default Value Configurable Access Control list level 4 Any...

Page 50: ...ace early token release ENABLED Yes Management Interface locally administered address 00 00 00 00 00 00 Yes Management Interface MAC address type BURNED IN Yes Operational version Initially v1 0 No Po...

Page 51: ...ENABLED Yes Surrogate group DISABLED Yes Surrogate REM Admin status DISABLED Yes Surrogate REM trap flag ENABLED Yes Surrogate RPS Admin status DISABLED Yes Surrogate RPS trap flag ENABLED Yes System...

Page 52: ...Parameter Default Value Configurable Trap RMON DISABLED Yes Trap script ENABLED Yes 4 12 8239 Setup and User s Guide...

Page 53: ...le to solve a problem contact your provider of service Using the LEDs to Diagnose Problems All 8239s have LEDs that indicate the status of some of their components The following types of LEDs are prov...

Page 54: ...239 power cord is disconnected Connect the power cord 8239 power cable is defective Replace the power cord Power outlet is not supplying power Check the power outlet Power supply failure If the fans a...

Page 55: ...more the unit is not operational For the cause of this hardware failure go to LCD and LED Codes on page 5 14 On Blinking Unit is executing beacon recovery Off Off If indicators remain off for more tha...

Page 56: ...and the workstation is operating correctly Cabling problem Make sure that all cable connections are secure Check the cable for breaks or other damage Replace suspect cables with cables that are known...

Page 57: ...tus Cause Action A MAC address that is not in the port s security table was inserted at that port when port status was SECURITY BREACH If it is OK for that workstation to be inserted at that port add...

Page 58: ...RO Status Green LED Table 5 6 RI RO Status Green LED State Meaning On RI RO is inserted Off RI RO is not inserted Cause Action Cabling problem Make sure all cable connections are secure Go to RI RO Mo...

Page 59: ...ements in Cable Types and Distances on page 1 4 Fault is on the remote device Resolve the problem at or off of the remote device The 8239 will automatically unwrap the RI RO connector that was wrapped...

Page 60: ...tatus Green Control In Meaning On Off On Normal Data In is unwrapped Control In is unwrapped Blinking Off On No faults detected Data In has been wrapped by system administrator Action If required use...

Page 61: ...Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it Off On Off Fault detected in both Data In and Control In both are wrapped Cause Act...

Page 62: ...on page 1 4 Replace suspect cables with known good cables Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it On On Off Fault detected...

Page 63: ...n good cables Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it Stack Out Status Table 5 9 Page 1 of 4 Stack Out Status Green Data Ou...

Page 64: ...cables Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it Off On Off Fault detected in both Data Out and Control Out both are wrapped...

Page 65: ...age 1 4 Replace suspect cables with known good cables Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it On On Off Fault detected in C...

Page 66: ...Types and Distances on page 1 4 Replace suspect cables with known good cables Allow one minute after each replacement for problem to clear Hardware failure Isolate the faulty 8239 and replace it LCD...

Page 67: ...ce the base unit N O 1 Press the Reset button If the problem remains continue with step 2 on page 5 15 2 Remove any optional features 3 Replace the base unit 4 Install features into new base unit Oper...

Page 68: ...g reported for a device external to the stack or is equal to the hub ID if the trap is being reported for a specific hub type has a value of E error or I informational value is a 2 digit number identi...

Page 69: ...hub 2 does not match hub 1 The message also indicates that the Management Interface is inserted in the network that has a ring segment number of 142 Trap Message Number Type Text Meaning 01 I Hub Up 8...

Page 70: ...5 18 8239 Setup and User s Guide...

Page 71: ...d twisted pair UTP or shielded twisted pair STP An optional port expansion card is available to increase the number of RJ 45 ports in the hub from 16 to 32 The port expansion card is inserted into a f...

Page 72: ...ed the 8239 allows a station running at a different speed to continue to request insertion until it exceeds the speed mismatch threshold value The default value for the speed mismatch threshold is 8 a...

Page 73: ...oup issue the following terminal interface commands 1 SET GROUP NAME to assign a name to a port group 2 SET GROUP PORT to assign ports to a port group The following terminal interface commands are rel...

Page 74: ...rt is successfully inserted The green LED is on the yellow LED is off Port status is BEACON WRAPPED when the port was detected to be the source of beaconing The green LED is off the yellow LED is on P...

Page 75: ...ce to which multiple stations can be attached the device itself is then attached to a single port on the 8239 The IBM 8226 and the IBM 8228 are examples of fanout devices Note the following considerat...

Page 76: ...hen either of the following conditions exists The MAC address is for a station that is part of the ring segment because it is attached via an 8239 RI RO connection see Ring In Ring Out Concepts 8239 M...

Page 77: ...to as a security intrusion or security breach and it is attached to an 8239 port the 8239 will take the appropriate action based on what was configured To use port security you must Identify the MAC...

Page 78: ...le for IBM 8239 traps Refer to Trap Processing on page 7 10 for more information To display what security intrusions have occurred use the DISPLAY SECURITY INTRUDER_LIST terminal interface command The...

Page 79: ...RO configuration options Administrative mode Up down traps RI RO Administrative Mode An administrative mode associated with each RI RO indicates whether or not the RI RO connection should be allowed t...

Page 80: ...terminal interface command For information on the meaning of the RI RO status LEDs refer to RI RO Status on page 5 6 Stack Concepts Individual 8239 units can be connected to form a stack Each 8239 co...

Page 81: ...ability to change the status of CI CO is not available via SNMP To display the current wrap settings issue the DISPLAY WRAP_POINTS terminal interface command CI CO and DI DO Up Down Traps The 8239 ca...

Page 82: ...areas and the actions that are taken when the fault is removed Data In Data Out Connection When the beacon fault is found to originate from the Data In or the Data Out connection on the 8239 the 8239...

Page 83: ...s been corrected you must re enable the port by issuing the ENABLE PORT terminal interface command This command sets the beacon counter for that port to zero Management Interface 8239 Model 1 only Whe...

Page 84: ...ocessing on page 7 10 for details about sending the trap Sets the status of the RI RO to WRAPPED The RI RO status can be displayed by issuing the DISPLAY WRAP_POINTS or DISPLAY RING_IO terminal interf...

Page 85: ...for remote access See Connecting an ASCII Terminal or Modem to the EIA 232 Port on page 2 5 for instructions for connecting to the EIA 232 port See Using the Command Interface on page 4 1 for informat...

Page 86: ...d at the 8239 terminal prompt results in the 8239 sending 10 Internet Control Message Protocol ICMP request packets to the specified device If the device is active it should respond to each request pa...

Page 87: ...B II RMON MIB and Aspen MIB objects excluding objects in the accessControl group and in the captureBufferTable The default community name is rmon Level 3 provides write access to RMON MIB and Aspen MI...

Page 88: ...ub IDs exist The appropriate access mode exists for command execution If an error is detected during the execution of a script the remaining lines in the script are not executed Each script file can c...

Page 89: ...he script name type display scripts Enter 1 NoName 1 6 NoName 6 2 NoName 2 7 NoName 7 3 script1 8 NoName 8 4 NoName 4 9 NoName 9 5 NoName 5 10 NoName 10 Adding Commands It is recommended that you firs...

Page 90: ...he example from Adding Commands on page 7 5 assume you need to disable port 6 instead of port 5 Because you will access lines within the script by line number you should list the script before you mod...

Page 91: ...ipt can end with a command that runs another script Be careful that you do not create a loop that would cause you to have to reset the 8239 From a Schedule 8239 Model 1 only To run a script from a sch...

Page 92: ...nds 5 Fri 10 Everyday set schedule day_periodic 1 To run the schedule on weekdays type set schedule day_periodic 1 8 Enter Enter the time hh mm set schedule day_periodic 1 Weekdays Provide the time se...

Page 93: ...lures After a scheduled script is executed on an 8239 Model 1 only an Execute Script Trap may be sent depending on the script trap_setting The default value is enabled To change the script trap_settin...

Page 94: ...ormation about significant events about the stack or your network They can be used to trigger an administrator action if desired Based on the settings of trap flags the 8239 will send a predefined set...

Page 95: ...can display traps at a remote console that is connected by either the EIA 232 interface or a Telnet session To display traps on the terminal interface you must configure the 8239 with console_display...

Page 96: ...tries configured in the trap community table at the factory To add entries to the trap community table issue the SET TRAP_COMMUNITY terminal interface command To control the IP addresses to which trap...

Page 97: ...ould be sent issue the SET TRAP_COMMUNITY IBM8239 terminal interface command Port Up Down Trap The default value for Port Up Down traps is enabled To change the setting issue the ENABLE DISABLE PORT_S...

Page 98: ...d Ring IO Status Up Down are displayed on the LCD but Multiple Users and Script are not Sent to an SNMP Application The trap is sent via SNMP if there is a valid entry in the trap community table and...

Page 99: ...t forwarded to other 8239 Model 1s in the stack If the trap is generated viewing takes these forms Terminal Interface If the console_display TRAP_SETTING is enabled then the trap is displayed on the t...

Page 100: ...p will be displayed on the terminal interface Otherwise nothing is displayed Trap Log The trap is put in the trap log 8239 Model 1 LCD The trap is not displayed on the LCD Sent to an SNMP Application...

Page 101: ...terminal interface command to view the burned in MAC address of the Management Interface On both the 8239 Model 1 and the 8239 Model 2 MAC addresses are assigned to the hardware assist entities used f...

Page 102: ...7 18 8239 Setup and User s Guide...

Page 103: ...r REM Ring Parameter Server RPS For a complete listing of commands referenced in this chapter see the Command Reference Accessing Network Management Data You can use in band and out of band access to...

Page 104: ...ropriate object in the IBM 8239 TR Hub MIB 8239 MIB The factory default for 802 5_GROUP is DISABLED which means that all of the entries in the Statistics Table are set to 0 To allow the 8239 Model 1 t...

Page 105: ...E_MONITOR_PARTICIPATION command or an SNMP Set request to the appropriate object in the 8239 MIB dot5Functional The only functional addresses supported by the Management Interface that can be changed...

Page 106: ...PLAY IP ARP_CACHE command or Accessing the appropriate object in the 8239 MIB Configuring the 8239 Model 1 to Support MIB II The 8239 Model 1 will automatically collect and provide information for the...

Page 107: ...ftware A device that supports gathering and reporting the RMON data is referred to as an RMON probe or RMON agent The 8239 Model 1 is an embedded RMON probe RMON consists of RFC 1757 and RFC 1513 It p...

Page 108: ...Alarm group requires the Event group Filter Instructs the 8239 Model 1 to capture only those packets that match a specific criterion This group enables you to configure specific packet capture criteri...

Page 109: ...ce routing statistics to be accurate the 8239 Model 1 must know the ring segment number If there is an external RPS on the ring then no action is required otherwise the 8239 Model 1 must be configured...

Page 110: ...contains a number of additional groups These groups are Protocol Directory A master directory of all of the protocols that the probe can interpret Protocol Distribution Aggregate statistics on the am...

Page 111: ...interface commands DISPLAY TERMINAL SET TERMINAL Under the Probe Configuration group probeDateTime DISPLAY CLOCK REPLICATE_CLOCK SET CLOCK probeResetControl RESET_HUB you may want to issue SAVE first...

Page 112: ...or host names Address Translation in ECAM also provides the ability to identify duplicate addresses Configuring the 8239 Model 1 to Support ECAM The factory setting disables ECAM for the 8239 Model 1...

Page 113: ...information about occurrences on the network to an SNMP Management Application such as IBM s Nways Campus Manager LAN for AIX Surrogate Group The Surrogate Group contains information regarding the adm...

Page 114: ...ith the Management Interface The ring segment number is the number that is to be used when the 8239 Model 1 is the RPS When the 8239 Model 1 RPS function is not enabled and there is no external RPS on...

Page 115: ...LE TR_SURROGATE SURR_STATUS CRS_ADMIN terminal interface command To enable the Surrogate Group see Configuring for the Surrogate Agent on page 4 7 Part of the CRS function is to report ring topology c...

Page 116: ...remRingLineErrors remRingInternalErrors remRingBurstErrors remRingACErrors remRingABortXmitted remRingLostFrames remRingReceiverCongestion remRingFrameCopied remRingFrequencyError remRingTokenError r...

Page 117: ...ceeded rewPreWeightExceeded remNonIsoThresholdExceeded When unexpected network problems occur additional REM flags can be enabled to help analyze and isolate the problems Note Traps reporting beaconin...

Page 118: ...bject in the IBM TR Surrogate MIB or issue the SET TR_SURROGATE SEGMENT_NUMBER terminal interface command To enable RPS issue an SNMP Set request to the appropriate MIB object in the IBM TR Surrogate...

Page 119: ...erface command The flag to indicate whether or not RPS traps should be generated is not part of the IBM TR Surrogate MIB but is part of the 8239 MIB This flag can be accessed by an SNMP request to the...

Page 120: ...8 18 8239 Setup and User s Guide...

Page 121: ...Wiring Closet Room ____ Ring Number _____ Rack Number ____ MAC Address _____ Ring Connection for Optional RI RO Module RI RO Connect to Device Token Ring Port Connections 1 2 3 4 5 6 7 8 Connect to D...

Page 122: ...Description of the 8239 System Contact Defines a contact name and telephone number System Name Defines a name for the 8239 System Location Defines the location of the 8239 Community Access up to 20 C...

Page 123: ...communities If set to disable no alerts are sent Trap Type Private If set to enable the 8239 sends this type of alert to the configured trap communities If set to disable no alerts are sent Trap Type...

Page 124: ...ption Your Data Login Name Login name to allow access to the terminal interface Using admin with no password is the default Login Password Password to allow access to the terminal interface 9 4 8239 S...

Page 125: ...ransportation charges both ways will be paid by IBM Failure to use the carton in which the replacement unit was received could result in charges incurred by the customer for damage to the failed unit...

Page 126: ...e of service designated for the Machine and will manage and install engineering changes that apply to the Machine For IBM or your reseller to provide warranty service for a feature conversion or upgra...

Page 127: ...le before service is provided a follow the problem determination problem analysis and service request procedures that IBM or your reseller provide b secure all programs data and funds contained in a M...

Page 128: ...he greater of U S 100 000 or the charges if recurring 12 months charges apply for the Machine that is the subject of the claim UNDER NO CIRCUMSTANCES IS IBM LIABLE FOR ANY OF THE FOLLOWING 1 THIRD PAR...

Page 129: ...oper place in the glossary Synonymous with This is a backward reference from a defined term to all other terms that have the same meaning See This refers the reader to multiple word terms that have th...

Page 130: ...dustry represents the views of its members and develops industry standards H hub A multiprotocol networking device that can contain modules supporting concentrators bridges routers and so on such as t...

Page 131: ...etwork interface card NIC The point of interconnection between the public switched network and a privately owned terminal O out of band The ability to manage the 8239 by attaching the device to the EI...

Page 132: ...TCP IP A set of communications protocols that support peer to peer connectivity functions for both local and wide area networks trap In the Simple Network Management Protocol SNMP a message sent by a...

Page 133: ...vity 4 5 for RMON 4 7 for surrogate agent 4 7 parameters 4 9 using BOOTP 4 5 using the command interface 4 1 Configuration Report Server CRS 8 13 connecting cables 2 4 connectivity in band 7 1 out of...

Page 134: ...port cabling 1 4 concepts 6 1 security 6 7 POST codes 5 14 powering on the 8239 2 6 preparing for setup 2 1 problem determination error codes 5 14 POST codes 5 14 using LCD messages 5 15 using the LE...

Page 135: ......

Page 136: ...nal publications or to ask questions or make comments about the functions of IBM products or systems you should talk to your IBM representative or to your IBM authorized remarketer When you send comme...

Page 137: ...or your responses May we contact you Yes No When you send comments to IBM you grant IBM a nonexclusive right to use or distribute your comments in any way it believes appropriate without incurring any...

Page 138: ...and Tape NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS MAIL PERMIT NO 40 ARMONK NEW YORK POSTAGE WILL BE PAID BY ADDRESSEE IBM Corporation Design Information Deve...

Page 139: ......

Page 140: ...Printed in USA GA27 4209 00...

Page 141: ...Spine information 8239 Token Ring Stackable Hub Setup and User s Guide...

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