Cabletron Systems SEH100TX-22 User's Manual
Contents
1. Chapter 6 Troubleshooting MGMT This LED flashes when an intelligent hub is managing the SEH If this LED is not flashing an intelligent hub is not managing the SEH If an intelligent hub is attached to the SEH and the LED is not flashing inspect the HubSTACK interconnect cables for proper connection CLN When this red LED flashes it indicates that a collision has occurred on one of the ports RCV When a yellow RCV LED flashes it indicates that the SEH is receiving data packets from the associated port segment Each SEH port has a corresponding RCV LED e Network Ports RCV LEDs 1 22 e EPIM 1 RCV LED EI e EPIM2 RCV LED E2 LNK When a green LNK LED is on it indicates an established link between the associated port and the device at the other end of the segment The LNK LED remains on as long as a link is maintained Each SEH Network Port ports 1 22 has a corresponding LNK LED 6 4 SEH100TX User s Guide EPIM Specifications APPENDIX A EPIM INFORMATION A 1 EPIM SPECIFICATIONS EPIMs enable the connection of the SEH to the network using different media types The SEHI100TX 22 supports the EPIM 100TX EPIM 100FX and the EPIM 100FMB This appendix provides the specifications for each EPIM A 1 1 EPIM 100TX The EPIM 100TX is an RJ45 connector supporting Unshielded Twisted Pair UTP cabling The slide switch on the EPIM 100TX determines the crossover status of the cable pairs If the switch is on the X side2. Storage Temperature 30 C to 73 C 22 F to 164 F Operating Humidity 15 to 95 non condensing 3 5 AGENCY APPROVALS The safety emission and immunity approvals for the SEH are detailed in this section 3 5 1 Safety This unit meets the requirements of UL 1950 CSA C22 2 No 950 IEC 950 and EN 60950 3 5 2 Emission This unit is compliant with the requirements of FCC Part 15 Class A EN 55022 Class A and VCCI Class I 3 6 SEH100TX User s Guide Physical Specifications 3 5 3 Immunity This unit meets the requirements of EN 50082 1 including IEC 801 2 ESD IEC 801 3 Radiated Susceptibility and IEC 801 4 EFT B 3 6 PHYSICAL SPECIFICATIONS This section details the physical specifications for the SEH Dimensions H x W x D 2 8 in x 17 0 in x 13 5 in 7 2 cm x 43 6 cm x 34 6 cm Weight 7 Ib 3 15 kg SEH100TX User s Guide 3 7 Chapter 3 Installation Requirements and Specifications 3 8 SEH100TX User s Guide CHAPTER 4 INSTALLATION This chapter outlines the procedure for attaching the SEH to the network as a stackable or standalone device Ensure that the network meets the guidelines and requirements outlined in Chapter 3 Installation Requirements and Specifications before installing the SEH A single phase grounded power receptacle that meets the power supply requirements listed in Chapter 3 must be located within seven feet of the installation z o 4 m Failure to follow insta
3. e IEC et du c te secteur d une prise adapt e l usage du produit et aux normes du pays o l appareil est utilis
4. 4 INSTALLATION 4 1 Unpacking the SEH sse 4 1 4 2 Tabletop or Shelf Installation enee einne nenene nene 4 2 4 3 Rackmount installation ee ee ee ee ee ee Re ee 4 3 4 4 Powering Up and Stacking the SEH iese sesse i 4 5 4 4 1 Stacking SEH Hubs with an SEHI sees see see ee ee 4 6 4 4 2 Stacking Unmanaged SEH Hubs Together 4 8 4 5 Installing an EPIM mmn 4 8 CHAPTER5 CONNECTING TO THE NETWORK 5 1 Connecting the SEH100TX 22 to the Network 5 1 5 1 1 Connecting to Network PottS i 5 1 5 1 2 Connecting to an EPIM 100TX i 5 2 5 1 3 nnecting an EPIM 100FX or EPIM 100FMB 5 4 5 2 Testing the Installation ee ee ee AA ee AA ee 5 5 CHAPTER6 TROUBLESHOOTING 6 1 Installation Test eee reme eet reete ein 6 1 6 2 Using LANVIEW ese ee ee ee ee ee Ge eene nne nnne nennen 6 2 APPENDIX A EPIM INFORMATION A 1 EPIM Specifications ies ee ee se ee ee ke de ee ee Re AA Ge ee ee ee ee A 1 AA SALE DOER EE EE KO EAE TATA A 1 A1 2 EPIM 100FX ap Ge ec rede pedet es A 2 A 1 3 EPIM 100FMB ssseeseseseeeeeereeetn trennen A 3 INDEX vi SEH100TX User s Guide CHAPTER 1 INTRODUCTION Welcome to the Cabletron Systems SEH100TX 22 100BASE T Stackable Hub User s Guide This manual provides installation instructions troubleshootin
5. INSTALLATION REQUIREMENTS AND SPECIFICATIONS This chapter describes cabling requirements network guidelines and operating specifications for the SEH100TX 22 The network must meet the requirements and conditions specified in this chapter to obtain satisfactory performance from this equipment Failure to follow these guidelines could result in poor network performance 3 1 CABLE SPECIFICATIONS The front panel SEH100TX 22 network ports support Category 5 Unshielded Twisted Pair UTP cabling Ethernet Port Interface Modules EPIMs expand the network using UTP EPIM 100TX or multimode fiber optic EPIM 100FX or EPIM 100FMB cabling For information concerning the two EPIM types refer to Appendix A The rear panel Interconnect Bus ports support Cabletron Systems Interconnect cables for stackable applications Take care in planning and preparing the network cabling and connections The quality of the connections and the length of cables are critical factors in determining the reliability of the network The following sections provide the specifications for each media type 3 1 1 HubSTACK Interconnect Cable Requirements Connect units in the stack together with the HubSTACK Interconnect cables shipped with the SEH module and available only from Cabletron Systems P N 9380209 The cables attach to the SEH100TX 22 rear panel bus ports The rear panel of the SEH has an Interconnect Bus Out port and an Interconnect Bus In port to stack h
6. LED if applicable for the port is on If the LED is off perform each of the following steps until it is on 1 a Check that the 100BASE T device at the other end of the twisted pair segment is powered up Verify that the connector on the twisted pair segment has the proper pinouts Refer to Chapter 3 for the pin assignments for twisted pair connectors For the EPIM 100FX or EPIM 100FMB check that the TX and RX strands are properly connected Check the cable for continuity Several tools are available for this test depending on the media used Check that the twisted pair segments or fiber optic segments meet the cable specifications as described in Chapter 3 SEH100TX User s Guide 6 1 Chapter 6 Troubleshooting 2 Ifthe remote station is ready and the LNK LED is on but no data passes through the port one of the following conditions may exist a Network management has disabled the port Correct this condition by enabling the port through network management b The port is segmented either because the collision detector was on for more than 110 us or the SEH detected more than 32 consecutive collisions on the attached segment The affected port remains segmented until a good packet is transmitted received without collisions If the LNK LED is still off contact Cabletron Systems Technical Support 6 2 USING LANVIEW The SEH incorporates the Cabletron Systems LANVIEW status monitoring and diagnostics system
7. Verify that the PWR LED is on indicating that the SEH is receiving power 4 6 SEH100TX User s Guide Powering Up and Stacking the SEH 5 Attach the interconnect cable to the IN port on the rear panel of the SEH as shown in Figure 4 5 REAR VIEW SEHI Managing 4 SEH Non Intelligent Hubs SEHoon 22 100BASE TX HUB WITH LANVIEW lt a v WY our 2 SUA Ma oeieo U a gt SEHoon 22 100BASE TX HUB WITH LANVIEW v v our a S S d x d U an 2 EN SEHioon 22 100BASE TX HUB WITH ni oe 1 OOBASE TX HubSTACK Q S N eon Interconnect Cable Vau a SEH oorx 22 100BASE TX HUB WITH LANVIEW 5 v v our war a SEHIoon 22 100BASE TX HUB with LANVIEW v v our a S S A sennoorxntescowect 1511_07 Figure 4 5 Stacking the SEH and SEHI 6 Attach the other end of the interconnect cable to the OUT port on the rear panel of the hub at the bottom of the stack Do not leave an interconnect cable connected at only one end N during network operation Corrupted data may result 7 Repeat steps 3 through 6 until all SEH hubs are connected SEH100TX User s Guide 4 7 Chapter 4 Installation 4 4 2 Stacking Unmanaged SEH Hubs Together Use the following procedure to stack non intelligent hubs SEHs together eee The SEH has a universal power supply that allows connection NOTE to power sources from 100 Vac to 125 Vac 4 0 A or 200
8. be contained in firmware chips or other media BY UTILIZING THE ENCLOSED PRODUCT YOU ARE AGREEING TO BECOME BOUND BY THE TERMS OF THIS AGREEMENT WHICH INCLUDES THE LICENSE AND THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY IF YOU DO NOT AGREE TO THE TERMS OF THIS AGREEMENT PROMPTLY RETURN THE UNUSED PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND SEH100TX User s Guide Notice CABLETRON SOFTWARE PROGRAM LICENSE 1 LICENSE You have the right to use only the one 1 copy of the Program provided in this package subject to the terms and conditions of this License Agreement You may not copy reproduce or transmit any part of the Program except as permitted by the Copyright Act of the United States or as authorized in writing by Cabletron 2 OTHER RESTRICTIONS You may not reverse engineer decompile or disassemble the Program 3 APPLICABLE LAW This License Agreement shall be interpreted and governed under the laws and in the state and federal courts of New Hampshire You accept the personal jurisdiction and venue of the New Hampshire courts EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY 1 EXCLUSION OF WARRANTY Except as may be specifically provided by Cabletron in writing Cabletron makes no warranty expressed or implied concerning the Program including its documentation and media CABLETRON DISCLAIMS ALL WARRANTIES OTHER THAN THOSE SUPPLIED TO YOU BY CABLETRON IN WRITING EITHER EXPRESSED OR IM
9. cable lengths specified by the IEEE 802 3u standard for a Class I repeater As stated previously the physical size of the network is limited primarily by propagation delay The round trip delay cannot exceed 512 bit times or 5 12 ps A stack of five SEH hubs or four SEH hubs and one SEHI hub is equivalent to one repeater A 100BASE T network might use all UTP links all fiber links or a combination of both Figure 3 1 shows a simplified example of a network with one Class I repeater Link segments A and B represent the longest links in the network In this case if both segment A and segment B are UTP each segment may be up to 100 meters long for a maximum network length of 200 meters If segment A is UTP and segment B is fiber optic the maximum length of the network is 263 meters with a maximum UTP segment length of 100 meters If both segments A and B are multimode fiber optic the maximum length is 274 meters If a buffered uplink EPIM 100FMB is used the collision domain is stopped at the EPIM slot This allows a full length fiber optic link of 400 meters to be used as an uplink while maintaining 100 meter UTP and 400 meter fiber optic lengths to desktops So if segment A shown in Figure 3 1 is UTP and segment B is fiber optic the maximum length of the network is 500 meters If both segments are fiber optic the maximum length is 800 meters SEH100TX 22 Figure 3 1 Class Network 3 4 SEH100TX User s Guide N
10. of 3 1 UTP segments connection of 5 1 Index 2 SEH100TX User s Guide POWER SUPPLY CORD The mains 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 and a mains plug on the other end which is suitable for the use and application of the product and that is approved for use in the country of application GERMAN Die Netzleitung die mit diesem Geraet benuetzt wird soll einen zwei Leiter mit Erdleiter haben wobei die Leiter mindestens 0 75 mm sind mit einer normalen IEC Geraetesteckdose an einem Ende und einem Geraetestecker am anderen Ende versehen sind der fuer den Gebrauch und die Anwendung des Geraetes geeignet und der zum Benuetzen im Lande der Anwendung anerkannt ist SPANISH El cable principal de la red el ctrica utilizado con este equipo debe tener 2 conductores y 1 toma de tierra con un m nimo de 0 75 mm2 cada uno y necesita tener un aparato de acoplamiento standard IEC en un extremo y un enchufe para el cable principal de la red el ctrica en el otro extremo lo cual sea adecuado para el uso y applicaci n del producto y lo cual sea aprobado para uso en el pais de applicaci n FRENCH Le cordon d alimentation reliant cet appareil au secteur doit obligatoirement avoir deux fils conducteurs de 0 75 mm2 minimum et un fil de terre It doit galement tre quip du c t appareil d une fiche agr
11. perform the following steps until it is on a Check that the device at the other end of the link is powered up b Verify that there is proper cross over of the fiber optic strands between the applicable port on the SEH and the fiber optic device at the other end of the fiber optic segment c Verify that the fiber optic connection meets the dB loss specifications outlined in Section 3 1 3 If a link is not established contact Cabletron Systems Technical Support Refer to Section 1 3 for instructions on getting help 5 2 TESTING THE INSTALLATION The SEH100TX 22 is now ready for operation Before placing the network into service test that all stations can be addressed and that the SEH and all stations are indicating normal operation Ensure that the networking software is configured properly to match the installed network If there are any errors or abnormal operation proceed to Chapter 6 Troubleshooting SEH100TX User s Guide 5 5 Chapter 5 Connecting to the Network 5 6 SEH100TX User s Guide CHAPTER 6 TROUBLESHOOTING This chapter contains instructions for using LANVIEW LEDs to troubleshoot physical layer network problems 6 1 INSTALLATION TEST After connecting the SEH to the network verify that packets pass between all Ethernet devices connected to the SEH and any other devices connected to the network If there is a problem with any of the attached devices check the link as follows Check that the LNK
12. values listed above A 4 SEH100TX User s Guide Numerics 100BASE TX cable length 3 2 crosstalk 3 2 impedance 3 2 jitter 3 2 noise 3 2 temperature 3 3 A Agency approvals emission 3 6 immunity 3 7 safety 3 6 C Cable interconnecting SEHs 3 1 lengths 3 4 Cable specifications multimode fiber optic 3 3 overview of 3 1 UTP 3 2 D Dimensions 3 7 E Emission agency approvals 3 6 Environmental requirements 3 6 EPIM media type connector 2 4 EPIM specifications EPIM 100FMB A 3 EPIM 100FX A 2 EPIM 100TX A 1 EPIM 100FMB connection of 5 4 EPIM 100FX connection of 5 4 EPIM 100TX connection of 5 2 SEH100TX User s Guide INDEX H Help related manuals 1 4 HubSTACK cable requirements 3 1 I Immunity 3 7 Installation 5 5 6 1 EPIMs 4 8 rackmount 4 3 stacking 4 5 strain relief bracket 4 3 tabletop or shelf 4 2 testing 6 1 unpacking 4 1 Interconnecting SEHs requirements for 3 1 L LANVIEW LEDs 6 3 use of 6 2 N Network connection EPIM 100FMB 5 4 EPIM 100FX 5 4 EPIM 100TX 5 2 SEH100TX 22 5 1 Network connection UTP segments 5 1 Network port specifications SEHIOOTX 22 3 5 P Power supply requirements 3 6 Index 1 Index S Safety agency approval 3 6 SEH features 2 2 SEH100TX 22 connection of 5 1 Size dimensions 3 7 Specifications environmental requirements 3 6 power supply requirements 3 6 SEH network ports 3 5 T Testing 5 5 Troubleshooting 6 1 U UTP specification
13. 0 oo 5599099999995 MEMINI NNNM o 11X 10X 9X 8X 7X 6X 5X 4X X X 1X EPIM 1 um Port Status LEDs Network Ports 1 22 System LEDs EPIM Slots sua Sh q gt E aw aw Sur sen Power Supply Interconnect Bus OUT zi Interconnect Bus IN Port 1510 01 REAR VIEW Figure 2 1 Front and Rear Views of the SEH100TX 22 SEH100TX User s Guide Chapter 2 SEH Features and Options 2 1 SEH OVERVIEW The SEH100TX 22 is a repeating hub providing 22 RJ45 ports and two Ethernet Port Interface Module EPIM ports on the front panel for network connections The SEH has two rear panel Interconnect Bus ports for stackable connections The front panel EPIM ports support the EPIM 100TX EPIM 100FX and the EPIM 100FMB The SEH100TX 22 is designed to be managed by the Cabletron Systems intelligent stackable hub the SEHI100TX 22 The SEH100TX 22 operates in a 100BASE T Ethernet network This product will NOT operate in a 10BASE T environment Connect the SEH100TX 22 only to similar 100BASE T products such as the SEHI100TX 22 The SEH100TX 22 supports the EPIM 100TX EPIM 100FX and the EPIM 100FMB No other Cabletron Systems EPIMs operate in this device 2 2 SEH FEATURES Repeater Functionality The SEH fully conforms to the IEEE 802 3u Repeater specifications The SEH transmits retimed data packets regenerates the preamble extends fragments and arbitrates collisions The SEH100TX 22 mee
14. 10 C per hour 3 Ensure that the rack used will support the unit and that the rack will remain stable with the unit installed in it Support the SEH securely from underneath and align the mounting brackets of the SEH chassis with the screw holes in the equipment rack as shown in Figure 4 4 Fasten the SEH to the equipment rack securely 4 4 SEH100TX User s Guide Powering Up and Stacking the SEH 19 Inch Rack e e e HubSTACK 100BASE TX HUB wit LANVIEW ro e bs pi o 2 2 uy mx m amp WX X WX N se A e CABLETRON I m al oc Se SENTE ee eK SS 2 a EMT e 7 ali e P md e e E e e Screws 4 e pe 1510_06 Figure 4 4 Installing the SEH in the Rack Proceed to Section 4 4 Powering Up and Stacking the SEH 44 POWERING UP AND STACKING THE SEH The following section details the procedures that must be followed to power up and interconnect stacked hubs Failure to follow this procedure may result in damage to the N equipment If you are using an intelligent hub SEHI to manage the stack you must locate the SEHI at the bottom of the stack The SEHI must be completely powered up and initialized before powering up and interconnecting the rest of the stack If you are using an SEHI to manage the SEH stack proceed to Section 4 4 1 If you are not using an SEHI to manage the SEH stack proceed to Section 4 4 2 SE
15. England Location SEH100TX User s Guide CONTENTS CHAPTER1 INTRODUCTION Using This Manual 1 1 Document Conventions nennen 1 2 Getting Help ncr leale e i ge pee age ed 1 3 Related ManualS i 1 4 CHAPTER2 SEH FEATURES AND OPTIONS 3 1 3 2 3 4 3 5 dale EE enne nnne 2 2 SEH Features oni tee es be iter etat tees 2 2 Stackable Capabilities ee RA AA Ge AR AA ee ee ee 2 3 Rack Mounting Capabilities eese 2 3 Optlional EPIMS iiie eene eer a itera Mice 2 4 CHAPTER3 INSTALLATION REQUIREMENTS AND SPECIFICATIONS Cable Specifications ee ee RA AA Ge Re AA ee ee ee 3 1 3 1 1 HubSTACK Interconnect Cable Requirements 3 1 3 1 2 UTP Cable Specifications nesens ereenn 3 2 3 1 3 Multimode Fiber Optic Cable Specifications 3 3 Network Cable Lengths ie ee ee ee Ge ee ee ee 3 4 Network Port Specificati0nS iese esse ee ee ee ee ee ee ee AA ee ee 3 5 Operating SpecificatiONS i 3 6 3 4 1 Power Supply Requirements 3 6 3 4 2 Environmental Requirements sssesss 3 6 Agency ApprovalSs i 3 6 KEER AR ER RE EE EI ii 3 6 3 5 2 EMISSION ania ie Ee eene e d Ge Ne 3 6 3 5 9 ANUM EE EE EE Ern e iEn 3 7 Physical Specifications ee ee ee RA ee RA ee ee 3 7 3 6 SEH100TX User s Guide Contents CHAPTER
16. H100TX User s Guide 4 5 Chapter 4 Installation 4 4 1 Stacking SEH Hubs with an SEHI Follow the procedures in this section if you are using an SEHI to manage an SEH stack ee The SEH and the SEHI have universal power supplies that NOTE allow connection to power sources from 100 Vac to 125 Vac 4 0 A or 200 Vac to 250 Vac 9 2 0 A 50 60 Hz 1 Power up the SEHI by plugging the power cord into the back panel of the SEHI and plugging the other end into a grounded receptacle Locate the SEHI at the bottom of the stack For management purposes stacked hubs are always numbered from 1 to 5 starting at the bottom 2 Verify that the PWR LED is on indicating that the SEHI is receiving power After the SEHI runs a self test and completes the boot process successfully the CPU LED blinks green indicating normal operation If the LED remains red the processor is faulty contact Cabletron Systems Technical Support Do not proceed with the following steps until the CPU LED is a steady blinking green Do NOT power up or interconnect any other hubs in the stack N until the SEHI has successfully completed the boot process Also do NOT connect the interconnect cable between the SEH and the SEHI before powering up the SEH Otherwise damage to the SEH may result 3 Power up the SEH above the SEHI in the stack by plugging the power cord into the back panel of the SEH and plugging the other end into a grounded receptacle 4
17. LANVIEW LEDs help diagnose problems such as power failure or cable fault The SEH includes the following LANVIEW LEDs e PWR for power status e MGMT for management status e RCV Receive LNK Link and CLN Collision for Ethernet status Figure 6 1 provides a quick reference chart of LED locations and definitions This chapter also includes a detailed description of each LED 6 2 SEH100TX User s Guide Using LANVIEW HubSTACK 100BASE TX HUB with LANVIEW SEH 00rx 22 RCV 000000000000 CABLETRON LNK 00000000000 SYSTEMS 22 21 20 19 18 17 16151413122 22X OPWR Oo MGMT Rcv OO O CLN LED NAME LED COLOR DEFINITION PWR Off No power Power Green Solid Power MGMT Green Flashing SEH managed by an Management intelligent hub Off SEH not managed CLN Red Flashing Collision Collision Off No collision RCV Yellow Flashing SEHI is receiving data Receive Off No activity LNK Link established Link No Link 15101 02 Figure 6 1 LANVIEW LEDs el Flashing indicates an irregular LED pulse NOTE Blinking indicates a steady LED pulse PWR When this green LED is on it indicates that the SEH is receiving power If this LED is off it indicates a loss of input power Check that the power cord is properly plugged into the SEH and into the ac input power source circuit breaker fuse etc If the proper source power is present the problem could be with the SEH SEH100TX User s Guide 6 3
18. PLIED INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE PROGRAM THE ACCOMPANYING WRITTEN MATERIALS AND ANY ACCOMPANYING HARDWARE 2 NO LIABILITY FOR CONSEQUENTIAL DAMAGES IN NO EVENT SHALL CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS OF BUSINESS PROFITS BUSINESS INTERRUPTION LOSS OF BUSINESS INFORMATION SPECIAL INCIDENTAL CONSEQUENTIAL OR RELIANCE DAMAGES OR OTHER LOSS ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES OR ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES IN SOME INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU UNITED STATES GOVERNMENT RESTRICTED RIGHTS The enclosed product a was developed solely at private expense b contains restricted computer software submitted with restricted rights in accordance with Section 52227 19 a through d of the Commercial Computer Software Restricted Rights Clause and its successors and c in all respects is proprietary data belonging to Cabletron and or its suppliers For Department of Defense units the product is licensed with Restricted Rights as defined in the DoD Supplement to the Federal Acqu
19. SEH100TX 22 100BASE T STACKABLE HUB USER S GUIDE HubSTACK 100BASE TX HUB with LANVIEW SEHto01x 22 RITI 00099009999 2221 20198 TBE MSD CaBLETRON Es sers RESERVED FOREPIM RESERVED FOREPIM x eX 9X o MX ET Sa EPIM CABLETRON systems The Complete Networking Solution Only qualified personnel should perform installation procedures NOTICE 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 have been made The hardware firmware or software described in this manual is subject to change without notice IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES WHATSOEVER INCLUDING BUT NOT LIMITED TO LOST PROFITS ARISING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATION CONTAINED IN IT EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF KNOWN OR SHOULD HAVE KNOWN THE POSSIBILITY OF SUCH DAMAGES Copyright 1996 by Cabletron Systems Inc P O Box 5005 Rochester NH 03866 5005 All Rights Reserved Printed in the United States of America Order Number 9031510 02 December 1996 SPECTRUM LANVIEW and BRIM are registered trademarks and Element Manager EPIM EPIM 100FX EPIM 100TX EPIM 100FMB HubSTACK MicroMMAC SEH and SEHI are trademarks of Ca
20. Vac to 250 Vac 2 0 A 50 60 Hz Power up each SEH in the stack by plugging the power cord into the back panel of the SEH and plugging the other end into a grounded receptacle N Verify that the PWR LED for each hub is on indicating that each SEH is receiving power e Attach the interconnect cable to the IN port on the rear panel of the second SEH in the stack as shown in Figure 4 5 4 Attach the other end of the interconnect cable to the OUT port on the rear panel of the first SEH in the stack Do not leave an interconnect cable connected at only one end N during network operation Corrupted data may result 5 Continue connecting ports in this manner until all hubs are connected 4 5 INSTALLING AN EPIM This section contains procedures on how to replace an EPIM 100TX EPIM 100FX or EPIM 100FMB to upgrade or change the capabilities of your SEH100TX 22 After installing a new EPIM refer to the appropriate EPIM section in Appendix A to verify proper operation Observe all static precautions while handling an EPIM 4 8 SEH100TX User s Guide Installing an EPIM To install an EPIM 100TX EPIM 100FX or EPIM 100FMB proceed as follows When removing an EPIM pull the module straight out to N prevent damage to the connector 1 Remove the coverplate or the existing EPIM whichever applies 2 Slidethe new EPIM into place making sure that the connectors on the rear of the EPIM align cor
21. ain Relief Bracket TT Fd Po gt EL 1 1 og D D rt u o Noe o mono o X 09 x x x xi xi HMde SWAK UOULDIALI Xi xu MB OS X X OE XE XX z aicimigionzionsi 3 00000000 o 00000000 Z XL00LH3S e M3IANV1 HUM ENH XL 38SV800L MOV LSQnH 1510 12 Figure 4 2 Attaching the Strain Relief Bracket SEH100TX User s Guide 4 3 Chapter 4 Installation Rack Mounting the SEH Refer to Figure 4 3 and proceed as follows to install the SEH into a 19 inch rack 1 Remove the four cover screws two from each side located along the front edges of each side of the SEH Do not remove the cover from the SEH Do not remove any other screws from the unit 2 Using the four 6 32 x 3 8 inch replacement flathead cover screws provided in the rackmount kit attach the rack mounting brackets to each side of the SEH Rack Mounting Brackets 2 HubSTACK 100BASE TX HUB LANVIEWB IM SEH100Tx 22 ne lo o 0 o 9 e DOS co mE FEE oh me GN Lo EXE 1510 05 Screws 4 Figure 4 3 Installing the Rack Mounting Brackets The cooling fans at the rear panel of the SEH must have N adequate clearance two inches on either side and in the rear for unrestricted air flow The temperature for the selected location must be maintained between 5 C and 40 C and fluctuate less than
22. bletron Systems Inc All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies FCC NOTICE This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment uses generates and can radiate radio frequency energy and if not installed in accordance with the operator s manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause interference in which case the user will be required to correct the interference at his own expense WARNING Changes or modifications made to this device which are not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment ay Printed on amp Recycled Paper uw SEH100TX User s Guide Notice DOC NOTICE This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatu
23. e meets the impedance requirements for a 100BASE TX link jitter should not be a concern Crosstalk Crosstalk is caused by signal coupling between the different cable pairs contained within a multi pair cable bundle 100BASE TX transceivers are designed so that the user does not need to be concerned about cable crosstalk provided the cable meets all other requirements Noise Noise is caused by either crosstalk or externally induced impulses Impulse noise may cause data errors if the impulses occur at very specific times during data transmission Generally the user need not be concerned about noise If noise related data errors are suspected it may be necessary to either reroute the cable or eliminate the source of the impulse noise 3 2 SEH100TX User s Guide Cable Specifications Propagation Delay Propagation delay is the amount of time it takes data to travel from the sending device to the receiving device Total propagation delay allowed for the network is 256 bit times 2 56 us in one direction 5 12 us round trip If the total propagation delay between any two nodes on the network exceeds 2 56 us then use bridges or other devices to further segment the network Temperature The attenuation of PVC insulated cable varies significantly with temperature At temperatures greater than 40 C 104 F Cabletron Systems recommends the use of plenum rated cables to ensure that cable attenuation remains within specification 3 1 3 Mul
24. ecommended the segment should be removed from the network and wired correctly by a technician Connect the twisted pair segments to the SEH as follows 1 Plug the RJ45 connector from each twisted pair segment into the desired network port on the SEH See Figure 5 1 2 Plug the RJ45 connector at the other end or the twisted pair segment into the other device as appropriate SEH100TX User s Guide 5 1 Chapter 5 Connecting to the Network 1511_10 Figure 5 1 SEH Network Ports 3 Check that the applicable LNK LED for the port is on If the LED is off perform each of the following steps until it is on a Check that the IOOBASE TX device at the other end of the twisted pair segment is powered up b Verify that the RJ45 connector on the twisted pair segment has the proper pinouts c Check the cable for continuity d Check that the twisted pair connection meets the cable specifications outlined in Section 3 1 2 If a link is not established contact Cabletron Systems Technical Support Refer to Section 1 3 for details on getting help 5 1 2 Connecting to an EPIM 100TX The EPIM 100TX is often used to provide a connection between the SEH and a bridge router or switch Normally in this configuration a straight through cable is used and the EPIM crossover switch shown in Figure 5 2 is set to not crossed over 5 2 SEH100TX User s Guide Connecting the SEH100TX 22 to the Network The EPIM 100TX is a
25. es all SEH hubs in the stack and provides full packet and error statistics for the entire stack individual devices or individual ports SEH non intelligent hubs may be stacked together or with one SEHI using Cabletron Systems HubSTACK Interconnect cables provided with the SEH Stackable configurations make it possible to maintain only one IEEE repeater hop while providing up to 120 ports The design allows hubs to be added or removed from a stack without having to power down the entire stack 24 RACK MOUNTING CAPABILITIES The SEH can be installed in a 19 inch rack Cabletron Systems provides the necessary brackets and mounting screws for the SEH Refer to Chapter 4 Installation for complete rack mounting instructions SEH100TX User s Guide 2 3 Chapter 2 SEH Features and Options 2 5 OPTIONAL EPIMs EPIMs are not included with the SEH but they can be purchased separately from Cabletron Systems EPIMs enable the expansion of a network through different types of media Cabletron Systems offers three optional EPIMs for the SEH100TX 22 and SEHI100TX 22 as shown in Table 2 1 Table 2 1 100BASE TX FX FMB EPIMs EPIM Media Type Connector EPIM 100TX Category 5 Unshielded Twisted RJ45 Pair Cable EPIM 100FX Multimode Fiber Optic Cable SC EPIM 100FMB for 1 buffered uplinks Multimode Fiber Optic Cable SC For more details about the EPIMs refer to Appendix A 2 4 SEH100TX User s Guide CHAPTER 3
26. etwork Port Specifications Table 3 1 summarizes the maximum segment lengths for the type and combination of cables used with a Class I repeater The maximum length of an individual UTP segment may be no N more than 100 meters for proper operation Table 3 1 Maximum Class Network Cable Length Number UTP amp Multimode UTP amp An of UTP Multimode Fiber Buffered E iere i Repeaters Fiber Optics Optics EPIM EPIM 1 200m 263m 274m 500 m 800 m 3 3 NETWORK PORT SPECIFICATIONS The SEH network ports use shielded RJ45 connectors that support UTP cabling Figure 3 2 shows the RJ45 pinouts 12345678 11X 10X 9X 1 Receive 5 Not Used 2 Receive 6 Transmit 3 Transmit 7 Not Used 4 Not Used 8 Not Used 09162_02 Figure 3 2 RJ45 Network Port Pinouts SEH100TX User s Guide 3 5 Chapter 3 Installation Requirements and Specifications 34 OPERATING SPECIFICATIONS This section details power supply and environmental requirements 3 4 1 Power Supply Requirements The SEH has a universal power supply The input power requirements are listed in Table 3 2 Table 3 2 Power Requirements Line Input Range Current Frequency 100 125 Vac 4 0A 50 60 Hz 200 250 Vac 2 0A 342 Environmental Requirements The environmental reguirements for the SEH are detailed in this section Operating Temperature 5 C to 40 C 41 F to 104 F
27. g and reference information for the SEH 100TX 22 The terms SEH Stackable Ethernet Hub and SEHI Stackable Ethernet Hub with Intelligence are used throughout this manual when referring to the SEH100TX 22 and the SEHI100TX 22 respectively z o 4 m 1 1 USING THIS MANUAL Read through this manual to gain an understanding of the features and capabilities of the SEH A general knowledge of Ethernet and IEEE 802 3u type data communications networks and their physical layer components is helpful when installing the SEH Chapter 1 Introduction outlines the contents and describes the objectives and conventions of this manual This chapter also provides information about how to get help and concludes with a list of related manuals Chapter 2 SEH Features and Options briefly describes SEH features and provides information about available options Chapter 3 Installation Requirements and Specifications provides installation requirements network guidelines and SEH specifications Chapter 4 Installation contains instructions for installing the SEH as a stackable or standalone hub Chapter 5 Connecting to the Network explains how to connect the SEH to the network using the various media types Chapter 6 Troubleshooting describes how to use the LANVIEW LEDs to troubleshoot network problems Appendix A EPIM Information provides specifications cabling information and switch settings for the Ethernet Port Interface Mod
28. isition Regulations Section 52 227 7013 c 1 ii and its successors and use duplication disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at 252 227 7013 Cabletron Systems Inc 35 Industrial Way Rochester New Hampshire 03867 0505 SEH100TX User s Guide Notice DECLARATION OF CONFORMITY Application of Council Directive s Manufacturer s Name Manufacturer s Address European Representative Name European Representative Address Conformance to Directive s Product Standards Equipment Type Environment 89 336 EEC 73 23 EEC Cabletron Systems Inc 35 Industrial Way PO Box 5005 Rochester NH 03867 Mr J Solari Cabletron Systems Limited Nexus House Newbury Business Park London Road Newbury Berkshire RG13 2PZ England EC Directive 89 336 EEC EC Directive 73 23 EEC EN 55022 EN 50082 1 EN 60950 Networking Equipment for use in a Commercial or Light Industrial Environment We the undersigned hereby declare under our sole responsibility that the equipment packaged with this notice conforms to the above directives Manufacturer Mr Ronald Fotino Full Name Principal Compliance Engineer Title Rochester NH USA Location iv Legal Representative in Europe Mr J Solari Full Name Managing Director E M E A Title Newbury Berkshire
29. lation site with fluctuations of less than 10 C per hour The SEH must be located within seven feet of its power source and with an unrestricted free surface area as shown in Figure 4 1 In order to allow for proper cooling there must be a two inch N clearance on either side and the back of the unit A 15 24 cm 6 in B 45 72 cm 18 in C 53 34 cm 21 in D 213 36 cm 7 ft Figure 4 1 Tabletop or Shelf Installation Proceed to Section 4 4 Powering Up and Stacking the SEH 4 2 SEH100TX User s Guide Rackmount Installation 43 RACKMOUNT INSTALLATION To install the SEH in a 19 inch rack Cabletron Systems provides an accessory kit with the SEH that includes rack mounting brackets mounting screws and a strain relief bracket for cable management Rack mounting the SEH involves the following e Attaching the strain relief bracket Rack mounting the SEH e Stacking the SEH when applicable Attaching the Strain Relief Bracket Attach the strain relief bracket to the front of the SEH as follows 1 Locate the strain relief bracket and four 8 32 x 3 8 inch pan head screws from the rackmount kit other than the 8 32 x 3 8 inch screws included with the SEH Use of longer screws may damage the unit or cause electrical shock Do NOT attempt to attach the strain relief bracket with screws 2 Attach the strain relief bracket to the bottom of the SEH Figure 4 2 Screws 4 T T Str
30. llation instructions may result in damage to the equipment or electrical shock hazard gt lli This chapter covers the following topics Unpacking the SEH Section 4 1 Installing the SEH in a tabletop configuration Section 4 2 Rack Mounting the SEH Section 4 3 Powering Up and Stacking the SEH Section 4 4 Installing Optional EPIMs Section 4 5 4 1 UNPACKING THE SEH Unpack the SEH as follows 1 Remove the shipping material covering the SEH in the shipping box 2 Carefully remove the SEH from the shipping box and set it aside to prevent damage 3 Visually inspect the SEH If there are any signs of damage contact Cabletron Systems Technical Support immediately Refer to Section 1 3 Getting Help for instructions SEH100TX User s Guide 4 1 Chapter 4 Installation The SEH may be installed on a tabletop or shelf or in a 19 inch rack and configured as a standalone or stacked hub Go to Section 4 2 to install an SEH on a table or shelf Go to Section 4 3 to install the SEH in a rack 4 2 TABLETOP OR SHELF INSTALLATION This section provides guidelines for installation on a tabletop or shelf Tabletop and shelf installations must be within reach of the network cabling and meet the requirements listed below e Ina shelf installation the shelf must be able to support 30 pounds of static weight for each device in the stack Maintain a temperature of between 5 C 41 F and 40 C 104 F at the instal
31. lso used to provide another RJ45 port to connect to a UTP segment Before connecting a segment to the EPIM 100TX check each end of the segment to determine if the wires have been crossed over for the proper connection If the wires do not cross over use the switch on the EPIM 100TX to internally cross over the RJ45 port Refer to Figure 5 2 to set the EPIM 100TX crossover switch Position X crossed over 1 RX 2 RX 3 TX 4 NC Position not crossed over 1 TX 5 NC 2 TX 6 RX 3 RX 7 NC 4 NC 8 NC E Figure 5 2 EPIM 100TX Crossover Switch Connect an EPIM 100TX to a twisted pair segment as follows 1 Connect the twisted pair segment to the module by plugging the RJ45 connector on the twisted pair segment into the RJ45 port on the module See Figure 5 2 Plug the RJ45 connector at the other end of the twisted pair segment into the other device as appropriate Check that the LNK LED on the EPIM 100TX is on If the LED is off perform each of the following steps until it is on a Checkthatthe IOOBASE TX device at the other end of the twisted pair segment is powered up b Verify that the RJ45 connector on the twisted pair segment has the proper pinouts SEH100TX User s Guide 5 3 Chapter 5 Connecting to the Network c Check the cable for continuity d Check that the twisted pair connection meets the cable specifications outlined in Section 3 1 2 e Check that the crossover switch is i
32. n the correct position If a link is not established contact Cabletron Systems Technical Support 5 1 3 nnecting an EPIM 100FX or EPIM 100FMB The EPIM 100FX and EPIM 100FMB have an SC style network port see Figure 5 3 Cabletron Systems supplies fiber optic cables that use SC connectors that are keyed to insure proper crossover of the transmit and receive fibers An odd number of crossovers preferably one must be maintained between devices so that the transmit port of one device is connected to the receive port of the other device and vice versa z o m Use the following steps to connect a fiber segment to the EPIM 100FX or EPIM 100FMB 1 Remove the protective plastic covers from the fiber optic ports on the module port and from the ends of the connectors Do not touch the ends of the fiber optic strands and do not let N the ends come in contact with dust dirt or other contaminants Contamination of the ends causes problems in data transmissions If the ends become contaminated clean them with alcohol using a soft clean lint free cloth 2 Insert one end of the SC connector into the SEH EPIM 100FX or EPIM 100FMB See Figure 5 3 3 Atthe other end of the fiber optic cable attach the SC connector to the other device 5 4 SEH100TX User s Guide Testing the Installation EPIM 2 1510_10 Figure 5 3 EPIM 100FX Port 4 Check that the EPIM 100FX or EPIM 100FMB LNK LED is on If the LED is off
33. ode switches rebooting the unit etc e A description of your network environment layout cable type etc e Network load and frame size at the time of trouble if known e The serial and revision numbers of all Cabletron Systems products in the network e The device history i e have you returned the device before is this a recurring problem etc e Any previous Return Material Authorization RMA numbers SEH100TX User s Guide 1 3 Chapter 1 Introduction 1 4 RELATED MANUALS Use the Cabletron Systems SEH 00TX 22 100BASE T Intelligent Stackable Hub User s Guide to supplement the procedures and other technical data provided in this manual The procedures contained in the SEHI100TX 22 LOOBASE T Intelligent Stackable Hub User s Guide are referenced where appropriate but not repeated in this manual 1 4 SEH100TX User s Guide CHAPTER 2 SEH FEATURES AND OPTIONS This chapter provides an overview of the SEH Figure 2 1 and contains sections detailing the features and available options The abbreviations SEH Stackable Ethernet Hub and SEHI Stackable Ethernet Hub with Intelligence are used throughout this manual when referring to the SEH100TX 22 and the SEHI100TX 22 respectively EPIM2 HubSTACK 100BASE TX HUB with LANVIEW SEH100TX 22 00000000000 0 M ooooooooooo AMM AF MFI MM MM 2221201915 171815141312 2 22X PIX 20X 19X 18X 17K 16X 15X 14X 13X 12X CABLETRON SYSTEMS OPWR 00000
34. or 1511_20 Figure A 3 EPIM 100FMB The EPIM 100FMB acts as a non filtering bridge Its purpose is to extend the Broadcast Domain of a shared access 100BASE T LAN so that a full length of fiber optic cable can be used to reach the next domain or more typically to a switch port The maximum 100BASE T collision domain using UTP cable to the desktop and fiber cable in the next domain or switch port is only 263 meters 100 meters of UTP and 163 meters of fiber optics There are circumstances where the maximum fiber optic cable length of 163 meters does not meet some requirements such as in the cabling of high rise buildings or campus environments The EPIM 100FMB helps meet these requirements by extending the maximum fiber optic cable length that can be used from 163 meters to 400 meters SEH100TX User s Guide A 3 Appendix A EPIM Information Table A 2 provides the specifications for the EPIM 100FMB Table A 2 Transmitter Power EPIM 100FMB Cable Type Worst Case Budget Typical Budget 62 5 125 um fiber optic 9 0 dB 12 0 dB 100 140 um fiber optic 15 0 dB 18 0 dB The transmitter power levels and receive sensitivity levels listed are peak power levels after optical overshoot A peak power meter must be used to correctly compare the values given above to those measured on any particular port If power levels are being measured with an average power meter add 3 dBm to the measurement to compare the measured values to the
35. rectly and firmly with the connector inside the SEH Refer to Figure 4 6 3 Tighten the mounting screw NW LNK LJL JE JEJL JL J ms eee N EPIM 1 1510_09 Figure 4 6 Installing an EPIM SEH100TX User s Guide 4 9 Chapter 4 Installation 4 10 SEH100TX User s Guide CHAPTER 5 CONNECTING TO THE NETWORK This chapter outlines the procedure for connecting the SEH to a network Ensure that the network meets the guidelines and requirements outlined in Chapter 3 Installation Requirements and Specifications before installing the SEH100TX 22 5 1 CONNECTING THE SEH100TX 22 TO THE NETWORK The procedure for connecting network segments to the SEH varies depending on the media and ports being connected Refer to the following list and perform the procedure described in the subsections that apply to connecting the SEH to a network e Network Ports Section 5 1 1 e EPIM 100TX Section 5 1 2 e EPIM 100FX or EPIM 100FMB Section 5 1 3 Prior to connecting the network cabling check the connectors for the proper pinouts as shown in Chapter 3 5 1 1 Connecting to Network Ports Attach UTP segments to the RJ45 network ports on the front panel of the SEH Each RJ45 network port on the SEH incorporates a polarity detection and correction feature The polarity detection and correction feature allows the SEH to pass data regardless of the polarity of the twisted pair segment s receive link Operating in this condition is not r
36. s set out in the Radio Interference Regulations of the Canadian Department of Communications Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la class A prescrites dans le R glement sur le brouillage radio lectrique dict par le minist re des Communications du Canada VCCI NOTICE This equipment is in the 1st Class Category information equipment to be used in commercial and or industrial areas and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment VCCI aimed at preventing radio interference in commercial and or industrial areas Consequently when used in a residential area or in an adjacent area thereto radio interference may be caused to radios and TV receivers etc Read the instructions for correct handling COMB RE HE TAURI BOTEI NA PREE CHE T AEMUAC Oo REGE IE HB c LEAR MEA ERS VOCI ERIEALTENET Eo C FEHR EZ TOR LERAORAT LE 377 FVEV a VERS RERE LAT eoni WIRE Eo TELOR RV LIFE vs CABLETRON SYSTEMS INC PROGRAM LICENSE AGREEMENT IMPORTANT Before utilizing this product carefully read this License Agreement This document is an agreement between you the end user and Cabletron Systems Inc Cabletron that sets forth your rights and obligations with respect to the Cabletron software program the Program contained in this package The Program may
37. the pairs are internally crossed over If the switch is on the side the pairs are not internally crossed over Figure A 1 shows the pinouts for the EPIM 100TX in both positions Position X crossed over 1 RX 5 NC 2 RX 6 TX 3 TX 7 NC 4 NC 8 NC Position not crossed over 1 TX 5 NC 2 TX 6 RX 3 RX 7 NC 4 NC 8 NC isnan Figure A 1 EPIM 100TX Pinouts SEH100TX User s Guide A 1 Appendix A EPIM Information A 1 2 EPIM 100FX The EPIM 100FX shown in Figure A 2 supports Multimode Fiber Optic cabling The EPIM 100FX is equipped with an SC style connector Specifications for the EPIM 100FX are listed in Table A 1 1510 10 Figure A 2 EPIM 100FX Table A 1 Transmitter Power EPIM 100FX Cable Type Worst Case Budget Typical Budget 50 125 um fiber optic 6 0 dB 9 0 dB 62 5 125 um fiber optic 9 0 dB 12 0 dB 100 140 um fiber optic 15 0 dB 18 0 dB The transmitter power levels listed above are peak power levels after optical overshoot A peak power meter must be used to correctly compare the values given above to those measured on any particular port If power levels are being measured with an average power meter add 3 dBm to the measurement to compare the measured values to the values listed above A 2 SEH100TX User s Guide EPIM Specifications A 1 3 EPIM 100FMB The EPIM 100FMB shown in Figure A 3 supports multimode fiber optic cabling and has an SC style connect
38. timode Fiber Optic Cable Specifications The SEH supports the Cabletron Systems EPIM 100FX and EPIM 100FMB These EPIMs meet IEEE 802 3u standards When connecting a fiber optic segment to the SEH EPIM 100FX or EPIM 100FMB module the network must meet the following requirements Cable Loss Test the fiber optic cable with a fiber optic attenuation test set adjusted for an 850 nm wavelength This test verifies that the signal loss in a cable is within an acceptable level The maximum loss for a multimode fiber optic cable is 11 0 dB Fiber Optic Budget and Propagation Delay Determine the maximum fiber optic cable length by calculating the fiber optic budget delay and total network propagation before fiber optic cable runs are incorporated in any network design Fiber optic budget is the combination of the optical loss due to the fiber optic cable in line splices and fiber optic connectors Propagation delay collision delay is the amount of time it takes data to travel from the sending device to the receiving device Total propagation delay allowed for the entire network is 256 bit times 2 56 us in one direction 5 12 us round trip If the total propagation delay between any two nodes on the network exceeds 2 56 us then use bridges or other devices to further segment the network SEH100TX User s Guide 3 3 Chapter 3 Installation Requirements and Specifications 3 2 NETWORK CABLE LENGTHS This section details the maximum network
39. ts IEEE 802 3u Repeater Class I standards Class I standards allow one repeater between any two Data Terminal Equipment DTE devices within a single collision domain network The SEH automatically partitions problem segments and reconnects repaired segments to the network This feature minimizes the impact on network operation resulting from a problem on one segment by isolating the problem segment Only devices on the problem segment are affected When the problem is solved the SEH automatically reconnects the isolated segment to the network Polarity Detection and Correction Each twisted pair port on the SEH incorporates a Polarity Detection and Correction feature which allows the SEH to pass data regardless of the polarity of the receive link on the twisted pair segment 2 2 SEH100TX User s Guide Stackable Capabilities LANVIEW LEDs Cabletron Systems LANVIEW status monitoring and diagnostics system is a troubleshooting tool that helps in diagnosing power failures collisions cable faults and link problems The LANVIEW LEDs are conveniently located on the SEH front panel 2 3 STACKABLE CAPABILITIES The SEH100TX 22 is a non intelligent hub designed to be managed by the Cabletron Systems SEHI100TX 22 intelligent hub The design of the SEH allows the stacking of five SEH hubs in an unmanaged configuration or up to four Cabletron Systems SEH non intelligent hubs with one SEHI The SEHI is placed at the bottom of the stack It manag
40. ubs together The bus supports five stackable devices Stack up to five SEH hubs together or stack up to four SEH hubs together with one SEHI100TX 22 SEH100TX User s Guide 3 1 Chapter 3 Installation Requirements and Specifications 3 1 2 UTP Cable Specifications The device at the other end of the twisted pair segment must meet IEEE 802 3u 100BASE T specifications When connecting a 100BASE TX twisted pair segment to the SEH twisted pair network ports and the EPIM 100TX module the network must meet the following requirements Length The IEEE 802 3u 100BASE T standard requires that 100BASE TX devices have the ability to transmit over a 100 meter 328 foot link using Category 5 UTP wire The cable used must meet the Horizontal requirements and 90 meter length limitations Patch cable should be used on each end of the Horizontal wire to make connections to punch down blocks panels or other connecting devices The combined lengths of the patch cords must not exceed 10 meters so the total segment length including the patch cords does not exceed 100 meters 328 feet Category 5 cables are marked on the cable jacket as Cat 5 Category 5 Level 5 Level V or an equivalent Impedance UTP cables typically have an impedance of between 85 and 110 ohms Jitter Intersymbol interference and reflections cause jitter in the bit cell timing resulting in data errors A 100BASE TX link must not generate more than 1 4 ns of jitter If the cabl
41. ules SEH100TX User s Guide 1 1 Chapter 1 Introduction 1 2 DOCUMENT CONVENTIONS The following conventions are used throughout this document Note symbol Calls the reader s attention to any item of information that may be of special importance Tip symbol Conveys helpful hints concerning procedures or gt actions Caution symbol Contains information essential to avoid N damage to the equipment Electrical Hazard Warning symbol Warns against an action that could result in personal injury or death due to an electrical hazard 1 2 SEH100TX User s Guide Getting Help 1 3 GETTING HELP If you need additional support related to this device or if you have any questions comments or suggestions concerning this manual contact Cabletron Systems Technical Support Phone 603 332 9400 Monday Friday 8 A M 8 P M Eastern Time CompuServe GO CTRON from any prompt Internet mail support ctron com FTP ctron com 134 141 197 25 Login anonymous Password your email address BBS 603 335 3358 Modem setting 8N1 8 data bits 1 stop bit No parity For additional information about Cabletron Systems products visit our World Wide Web site http www cabletron com Before calling Cabletron Systems Technical Support have the following information ready e A description of the failure e A description of any action s already taken to resolve the problem e g changing m
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