Acer ALH-616ds User's Manual
Contents
1. Uplink Port 616ds Normal Ports Class ll Stacking 100Mbps Cascading or dual speed Hubs ODL LLL Stacking fs fff Cable a oli SSeS Sees idge OOD0O0O0OOTE pin CILILILILILILILJ Ports PCB Stacking Hubs a a a T CLL Stacking SZ J Class ll _ Hubs PCA 40Mbps Hubs Cascading Figure 3 6 Connect to Ethernet Hubs 3 2 2 Connecting to Ethernet Switches The factors governing hub and switch interconnection are The hubs are only connected to Ethernet switches by an uplink port ALH 616ds will automatically work at 100Mbps network speed when connected to 10 100Mbps Ethernet switching ports and it will work at 10Mbps network speed if connected to 10Mbps switching ports Uplink Port Normal Ports 616ds oa OOOOOOI Ethernet Switch Stacking OOOOOOOOe Cable Bridge To W Uplink OOOO Ports J LU H2HHHH7H m E 4 a 1 E S PCA S D PC B Figure 3 7 Connect to Ethernet Switches No matter if the ALH 616ds hubs are stacked together or not the user always can connect to Ethernet swi2. This chapter will guide you through how to install the AcerHub ALH 616ds It includes procedures for connecting to the external power supply installing the hub on your working surface connecting the Hub to your computer and guidelines to see if it works well Before setting up your hub please take note of the front and rear panel of this hub as shown in Figure 2 Aand 2 B f Acer amp SOHOHub 616ds 10 100m 5 15 25 35 55 imon Figure 2 A Front Panel L Ak Ah dh A A A A A A CT Li Stackable Normal Port Uplink Port DC Jack Connectors Note The ports marked I 2 3 4 5 6 7 8 on 10 11 12 13 14 15 16 are normal ports Please follow the installing procedures to make your network ready 2 1 Connecting to the external power supply Carefully unpack the AcerHub ALH 616ds and it s accessories For the first time that you use this hub please make sure there is nothing missing in the package The procedures for connecting to the power outlet are 2 1 1 Take out the hub and the power adapter from the packing box as shown in Figure 2 1 Figure 2 1 Get the hub and power adapter 2 1 2 Place the hub on the desktop and remove the packing box of the power ad
3. Tel 886 2 2713 9099 ext 7293 Fax 886 2 2718 4895 http www aci acer com tw Acer America Corporation Tel 1 408 432 6200 Fax 1 408 922 2993 http www acer com aac Distribution Information Hotline 1 800 369 6736 Fax 1 408 432 0496 http www acer com aac aod Acer Latin America Inc Tel 1 305 392 7200 Fax 1 305 392 7216 Acer Japan Corporation Tel 81 4 8290 1819 Fax 81 4 8290 1820 Acer Computer B V Tel 31 73 645 9645 Fax 31 73 645 9599 Acer UK Limited Tel 44 1628 533422 Fax 44 1628 524071 http www aceruk co uk Acer Computer France S A R L Tel 33 1 4817 4040 Fax 33 1 4817 4089 Acer Computer GmbH Tel 49 4102 488 0 Fax 49 4102 488 101 Dealers Information Hotline Germany 0180 3234781 End users Information Hotline Germany 0190 885554 Acer Computer Iberica S A Tel 34 3 499 0303 Fax 34 3 499 0483 Acer Italy Texas Instruments Tel 39 2 2692 2565 Fax 39 2 2692 1021 aS ve 100 Recyclable Paper P N 49 22013 101 Acer Netxus Inc A Communications Company of Acer
4. The hub is ready for network connection if the power LED lights up as shown in Figure 2 9 Power Cord Figure 2 9 Stack multiple hubs together 2 3 Connecting to computers 2 3 1 Make sure the hub is ready for networking by checking if the PWR indicator displays 2 3 2 See if the computer is working and find the RJ 45 connector of the adapter card in computers You can connect UTP Unshielded Twistered Pair cables from normal ports of the hub to computers directly as shown in Figure 2 10 Network Adapter Rear UTP Cable Figure 2 10 Connect to computers 2 3 3 Arrange the route for cabling if no fixed cabling box is provided Otherwise It s right way to connect from your computer to the fixed cabling box on your working surface and plug the other end of the cable to the RJ 45 connector on the hub as shown in Figure 2 11 UTP Cable Network Cabling Cable Box Figure 2 11 Connect UTP cable from hub to computers 2 3 4 After connecting to the hub please check if the Link LEDs on the adapter card and the hub named as LNK ACT are lit up as shown in Figure 2 12 If the LED is not lit up there must be something wrong and please reference to chapter 4 for quick trouble shooting PC LNK CO Power sa LE
5. ALH 616ds All PCs with 10Mbps network adapter cards transmit data at 10Mbps and form the 10Mbps network domain as shown in Figure 3 5 PCs with 10 100Mbps network adapter cards will auto negotiate and switch the network speed to 100Mbps They transmit data at 100Mbps and form the 100Mbps network domain as shown in Figure 3 5 TIMPs 100Mbps Y 616ds 616ds Eg Stacking F 10Mbps 100Mbps 10Mbps Bridged 10Mbps Up tink 100Mbps Figure 3 5 Network domains and bridged uplink The data in 10Mbps or 100Mbps domain will be inter connected by internal built in switch in the Master hub consequently All hubs delivering data by the shared bus always work on half duplex mode that is data can be sent or received at one time in one direction 3 2 Interconnection to Hubs and Switches 3 2 1 Connecting to Ethernet Hubs The factors governing hub interconnection are The hubs are only connected by uplink port ALH 616ds will automatically transmit at 10Mbps network speed when connecting to 10Mbps Ethernet hubs and 100Mbps network speed if connected to 100Mbps hubs e If multiple ALH 616ds are stacked together users can connect to hubs by the uplink port in slave hubs Therefore other hubs can perform another class Il cascading as shown in Figure 3 6
6. Fan Err Slave f Bridge 10 amp 100 Collision Figure 2 14 System Status Indicators PWR Indicates if the system is provided with power Master Slave Color On Off Indication Green On System Powered Off No Power FAN Err Indicates if the cooling FAN is dead Color On Off Indication Orange On FAN is dead Off Normal hub Indicates if the system is stacked to be the Master or Slave Note It s normal either Master or Slave LED will display when hubs are stacking Color On Off Indication Master Green On Master Off Malfunction Slave Green On Disable Off Malfunction Note The difference between Master hub and Slave hub will be explained in chapter 3 Collision Indicate if a collision occurs in 10Mbps or 100Mbps domain Color On Off_ Indication 10 Collision Orange Blink Collision in 10Mbps domain Off Normal 100 Collision Orange Blink Collision in 100Mbps domain Off Normal Bridge Indicates if the bridging function is enabled Color On Off Indication Green On Bridge function enabled Off Bridge function disabled Note The slave hub will provide a Bridge Uplink Port see chapter 3 for details 2 4 3 Network Status Indicators There are 3 LED indicators to indicate the network status of each connection port 7 2 3 4 5 r 100 10 O O O O O O O LN
7. non condensing Network Cable Specification UTP Category 5 LAN cable of EIA TIA 568 and EIA TIA TSB 36 specifications for 100Mbps Stacking Specification Maximum stacking of 5 sets as a single hub count by SCSI Cables SCSI II 50 pin connection cable of 100 mm long External Switching Power Adapter Operating AC power voltage 100 120 220 240V AC Auto switching Output DC power voltage 5V 3A maximum EMI Certifications FCC Part 15 Class A CE EN 55022 Class A VCCI VCCI V3 Class A C Tick AS NZS 3548 CISPR 22 Class A Product Limited Warranty Acer Netxus Incorporated ANI warrants its product to be free from defects in materials and workmanship under normal use and service for the following lengths of time from the date of purchase from ANI or its Authorized Resellers Network adapter card Limited Lifetime Unmanaged hub Limited Lifetime Dual speed hub 3 year Switch and managed hub 3 year Power supply adapter and fans in these devices provide ONE YEAR v All products with limited lifetime warranty have a standard five year warranty This warranty does not cover the product if it is damaged by abuse accident installation or improper testing If a product does not operate as warranted during the applicable warranty period ANI shall at its option and expense either robber the defective product or part returned to ANI or deliver to customer an equivalent product or part to replace the defective item Definitely all products t
8. surface as shown in Figure 2 6 High Power Figure 2 6 Lay hub on stable desktop 2 2 2 If you are installing more than one hub please turn off the power of all hubs first Then you can get another hub and place it above the previous one on the working surface as shown in Figure 2 7 Finally put the stacking kit inthe middle of two sides and click into the stacking hole in the plastic housing Check if all hubs are tightly fastened by the stacking kits and proceed to next step ji me CL al T Tem CL A A d O Suen gt 2 oe hs Stacking i Kit Figure 2 7 Unplug the power and stack two hubs together 2 2 3 Get the stackable cable and connect the cable to the stacking connectoron the hub as shown inFigure 2 8 Connect Down SCSI port of the upperhub to Up SCSI port of the lower hub Any loose connection of the stackablecable will cause problems with network performance and quality Stackable Cable Figure 2 8 Connect hubs by stacking cable 2 2 4 If you are trying to add more hubs in your office you can follow the procedures from 2 2 2 to 2 2 3 repeatedly Be sure not to stack hubs more than 5 include 5 sets in one stack 2 2 5 Plug the power cord into the outlet on wall and check if the power LED lights up
9. 1 Unpack the AcerHub ALH 616ds dual speed Hub and it saccessories refer section 1 3 2 Connect the Hub to the external Power supply refer to section 2 4 1 3 Use the normal ports to connect to PCs and computers 4 Use the uplink port to connect to another hub or LAN switch T UVEIVICWw Congratulations on your purchase of the AcerHub 616ds The AcerHub ALH 616ds is a 16 port dual speed fast Ethernet repeater hub for connection with multiple PCs to a workgroup LAN Local Area Network environment to sharenetwork resources 1 1 Product goal AcerHub ALH 616ds provides high speed and easy access to the LAN and Intranet both for SOHO Small Office Home Office and corporations Itallows data transmission at speeds of 10 Mbps or 100Mbps depending if theconnected device is running at 10Mbps or 100Mbps Besides the high speed data access the AcerHub ALH 616ds also supports one uplink port for Class ll cascading connection between hub stacks The uplink port will support the bridge function that permits a distance of 100 meters for data transmission in Class Il cascading and eliminates the repeater count limitation in IEEE 802 3u specifications It will be easy to construct your own LAN with ALH 616ds by this explicit expanding capability of data transmitting distances and user accounts Installation of AcerHub ALH 616ds is relatively simple and all you have to dois plug the cables from the adapter cards to the ports check the LEDs an
10. AcerHub Dual S peed Ethernet Hub User s Guide Acer amp Copyright Copyright1998 1999 Acer Netxus Inc All rights reserved No part of thispublication may be reproduced transmitted transcribed stored in aretrieval system or translated into any language or computer language inany form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior written permission of AcerNetxus Inc Disclaimer Acer Netxus Inc makes no representations or warranties either expressedor implied with respect to the contents hereof and specifically disclaimsany warranties merchantability or fitness for any particular purpose Anysoftware described in this manual is sold or licensed as ise Should theprograms prove defective following their purchase the buyer and not thiscompany its distributor or its dealer assumes the entire cost of allnecessary servicing repair and any incidental or consequential damagesresulting from any defect in the software Furthermore Acer Netxus Inc reserves the right to revise this publication and to make changes from timeto time in the contents hereof without obligation to notify any person ofsuch revision or changes Other brand and product names are trademarks and or registered trademarks of their respective holders 10 IMPORTANT SAFETY INSTRUCTIONS Read these instructions carefully Save these instructions for future reference Follow all warnings and in
11. K ACT in0 01O O 0 0 0 0 00 LNK ACT O O O O O 9 10 11 12 15 30 x0 30 Figure 2 15 Network Status Indicators 100 10 Indicates if the port is working at 100Mbps or 10Mbps Color On Off Indication Green On 100Mbps 10Mbps LNK ACT Indicates if the port is linked to another port or receiving data Color On Off Indication Green On Link succeeds Blink Receiving Off Link fails 2 4 4 Network utilization indicators There are 2 sets of LED indicators to indicate the real time network utilization of 10Mbps and 100Mbps domain Figure 2 15 Network Status Indicators AcerHub 616ds 10M 100M 5 15 25 35 55t L Utilization I Figure 2 16 Network utilization indicators ROW Speed Color Utilization 10M 10Mbps Green 5 15 25 Orange 35 55 100 M 100Mbps Green 5 15 25 Orange 35 55 The number of utilization is in percentage For example 15 of 100M means 15 of 100Mbps 55 of 10M means the utilization is more than 55 of 10Mbps JY DUNAIN FedasiDie INCTIWOIKS This chapter describes the network topology for hybrid 10Mbps and 100Mbps networks cabling requirement for connections the interoperability between hubs and switches and the function of bridge Up Link port Please turn over the page to see the different Topologies 3 1 Network topology for AcerHub ALH 616ds Th
12. apter as shown in Figure 2 2 Figure 2 2 Put the hub on desktop and find the proper power adapter 2 1 3 Verify it s a 5V 3A power adapter by looking at the indicating label If the adapter is correct please stretch the cable and plug the cord into the power jack of the hub as shown in Figure 2 3 abel Power Adapter Figure 2 3 Connect to the power adapter 2 1 4 Once the hub is connected to the power adapter please connect the power adapter to a power cord as shown in Figure 2 4 Rear Panel Figure 2 4 Connect to the power cord to wall outlet 2 1 5 Plug the power cord into the outlet on the wall and check if the power LED lights up If it lights up then the hub is ready to be connected to the network as shown in Figure 2 5 E ally Figure 2 5 Power on the hub and make it ready 2 2 Installing the hub on your working surface You have to find a solid working surface to place the hub and make sure the equipment is not close to any high voltage power source or over heated sources Also keep away from electronic equipment sensitive to electronic interference The brief procedures of installing your hub should be 2 2 1 Put the hub on a stable working
13. d you can start networking 1 2 Product Features AcerHub ALH 616ds provides the following features e 16 port dual speed hub each port is a 10 100 Mbps dual speed connection with network speed auto detection Fully complies with IEEE 802 3 and 802 3u specifications e Built in switching function to connect 10 and 100Mbps network domains e Stackable function to provide maximum stacking of 5 sets as a single hub count by SCSI II cables e In slave hub mode an uplink port with bridge function which provides scalable network expansion This function is very useful in constructing a large network refer section 3 1 for details e Built in switch auto disable function to avoid data looping when stacking e External switching power supply for lower power consumption and heat emission Compact design for SOHO desktop environment for easy networking 1 3 Product configuration The product configuration inside the package is shown in the figure 1 1 Please check the contents of the package if there is any missing part beforeusing the hub The accessories of this product include ALH 616ds dual speed hub 1 piece External switching power adapter 1 piece Power cord 1 piece Stacking cable SCSI II 1 piece Stacking kit 1 pairUser s manual 1 piece External Switching power adapter Power Cord Stacking Cable User s Manual bg Stacking Kit Figure 1 1Product configuration of AcerHub ALH 616ds Sed G NVIANG FIUL PIU Ploauy
14. e factors for ALH 616ds dual speed network implementation are For stand alone one the ALH 616ds consists of separate 10Mbps and 100Mbps network domains with one built in switch to inter connect the data in domains as shown in Figure 3 1 Built in Switch gt Active LZ Yi 10Mbps Domain 100Mbps fa Domain Figure 3 1 Separate domains in ALH 616ds e The hub will be divided into Master and Slave hubs when they are stacked together The upper most hub is the Master hub and other hubs are Slave hubs The Master hub continues to use the built in switch but the switch in the Slave hubs will be disabled The Slave hubs will provide a uplink port with bridge functional so called Bridge Uplink Port that utilizes the first connection port as well as in Figure 3 2 Normal Ports Uplink Port 616ds Master Hub Stacking mT aS EP ei eee SRESBERBSBEEa Cable 71 2a Normal Port Uj SSooosss i a Bridge E Uplink port OOSHOoCEm Uplink Slave Hub BM DODO OOoOC Ports a Ta m Wilt hub function SSSb055Cm SSqb0555m DOOOOOIoIL Normal Port SSeq00055m Uplink port I with Bridge function Figure 3 2 Master and Slave hubs in stacking ALH 616ds Note 1 To concern the convenience of the cross wiring connection between hubs ALH 616ds provide 1 normal p
15. g Fs z LNK ACT Front E am AEA O Cah aed Bi f Stackable Normal Port Uplink Port DC Jack Connectors ALH 616ds Figure 2 12 Check the Link LEDs both on hub and adapter card 2 4 Does the hub work well You can observe the LED status to see if the hub works fine The meanings of LEDs are defined in section 2 4 1 2 4 1 LED overview The locations of LED indicators are shown in Figure 2 13 Me Ge aes ae ie Ss a Master Bridge 100 100 Q O O 0 0 0 0 SOHOHub 676ds Pwr O 2 wK O O O O O 0 0 0 10M 100 100 100 O O O 0 0 0 0 gt 100M 00000000 5 15 2 3 55 g 0 i i 13 41516 Utilization Fan Err 9 Slave Collision LK ACT T T System Status Network Status Network Utilization Indicator Indicator Indicator Figure 2 13 LED overview There are three groups of LED indicators in the front panel e System status indicators Indicate the overall system status of the hub It includes system PWR Fan Err Master Slave indicators Collision of 10 and 100M and Bridge function Network status indicators Indicate working status of each connection port It includes port 100 10M LNK ACT e Network utilization indicators Indicate the bandwidth utilization of 10 and 100Mbps It includes 5 15 25 35 55 scales indicators 2 4 2 System status indicators Master PWR O d
16. hat are replaced will become the property of ANI Replacement products may be new or replacement or repaired product or part has a ninety days warranty or the remainder of the initial warranty period whichever is longer ANI shall not be responsible for any software firmware information or memory data of customer contained in stored on or integrated with any products returned to ANI pursuant to any warranty Before you obtain warranty service you must request an RNA Return Materials Autnorization number by calling facing or writing ANI s Customer Service Department at the numbers listed below You must use the original container or the equivalent and pay the shipping charge ANI SHALL NOT BE HELD LIABLE FOR INCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR RUNTIME DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE LOSS OF BUSINESS OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE INSTALLATION MAINTENANCE USE PERFORMANCE FAILURE OR INTERRUPTION OF ITS PRODUCTS EVEN IF ANI OR ITS AUTHORIZED DEALER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES If you purchased this product in the UNITEDSTATES some states do not allow the limitation or exclusion of liability for incidental consequential damages so the above limitation may not apply to you Model Name Series No S N Purchase Date Authorized distributors or Resellers Stamp ih sh Contact us Acer Computer International Ltd Taiwan Branch
17. he AcerHub ALH 616ds Ethernet Hubs properly Manual Structure This user manual consists of Quick Installation Guide seven chapters and three appendices as follows Quick Installation Guide Chapter1 Overview This chapter describes the features and functions of the AcerHub ALH 616ds Ethernet hubs and the items in the package Chapter 2 Make Your Hub Ready This chapter describes the installation procedures to make your hub ready for networking quickly and the easy way to find out if the hub work well Chapter 3 Build Feasible Network This chapter describes the specifications of this product and the hardware installation needed to set up the AcerHub ALH 616ds Chapter 4 Troubleshooting This chapter provides a simple troubleshooting guideline that you can follow Table of Contents Chapter 1 Overview 1 1 Product goal 1 2 Product features 1 3 Product configuration Chapter 2 Make Your Hub Ready 2A Connecting to the external power supply 2 2 Installing the hub on your working surface 2 3 Connecting to computers 2 4 Does the hub work well 2 4 1 LED overview2 92 4 2 System status indicators 2 4 3 Network status indicators 2 4 4 Network utilization indicators Chapter 3 Building Feasible Networks 3 1 Network topology for AcerHub ALH 616ds 3 2 Interconnection to hubs and switches Chapter 4 Troubleshooting Appendix A Specifications 1 1 1 1 1 2 2 1 2 4 2 7 2 9 2 10 2 11 2 12 3 1 3 4 Quick Installation Guide
18. ort marked as II and 1 cross over port marked as X These 2 ports are wired to each other by different wiring assignments 2 The up link port utilizes the first connection port with X sign When you connect to another hub by this uplink port you cannot simultaneously connect a PC to this port in which II sign is marked The reason being that if a PC is connected to it the physical signal in the cable will be corrupted The built in switches in slave hubs will be disabled automatically to avoid data looping from multiple inter connections of hubs as shown in Figure 3 3 gt Bridge Port gt Bridge Port o Built in Switch Active gt Bridge Port gt Bridge Port 100Mbps 100Mbps Switch Domain Domain i E Domain gt lt Disable Before Stacking After Stacking Figure 3 3 Auto Data looping prevention in ALH 616ds e By way of an uplink port with a Bridge function the limitations on 100Mbps hub count maximum 2 can be eliminated The hub count is unlimited and cable length between hubs can reach 100 meters as shown in Figure 3 4 616ds Gigds 616ds 616ds 616ds Master Stacking Joos ii Q amp Q Bridge Uplink Normal Port Port Normal Port Figure 3 4 Unlimited cascading of
19. r 4 2 Master and Slave LEDs State and Result Action LED state Stacking condition Result amp action For all ALH 616ds Both Master And both standalone Slave Led lit on and stacking condition Malfunction Contact your vendor For all ALH 616ds None or Master and both standalone Slave LED lit on and stacking condition ALH 616ds is aan it is ok standalone the uppermost hub aa only Master LED lit in the ALH 616ds it is ok Malfunction Contact your vendor on Check Please check if the stacking cable is properly connected the lower hubs in the ALH 616ds stack ALH 616ds is Malfunction Contact standalone your vendor only Slave LED lit on The uppermost hub in Malfunction Contact the ALH 616ds stack your vendor The lower hubs in the it is ok ALH 616ds stack rae If you have any problem in building your network with AcerHub ALH 616ds please contact your Vendor or visit our website Http www acernetxus com tw Appendix A Specifications Network Interface 16 port 10 100 dual speed auto detection function e 10Mbps Ethernet IEEE 802 3 10Base T 100Mbps Ethernet IEEE 802 3u 100Base TX One of the ports Port NO 1 has two RJ 45 connector to provide either normal or uplink connection Physical Dimension From front View Width 247 mm Depth 163 mm Height 45 mm Weight 1 5 Kg Environmental Operating Range Operating Environment 0 C to 55 C 82 F to 131 F Operating Humidity 20 to 80
20. structions marked on the product Unplug this product from the wall outlet before cleaning Do not useliquid cleaners or aerosol cleaners Use a damp cloth for cleaning Do not use this product near water Do not place this product on an unstable cart stand or table The product may fall causing serious damage to the product The openings should never be blocked by placing the product on a bed sofa rug or other similar surface This product should never be placed near or over a radiator or heat register or in a built in installation unless proper ventilation is provided This product should be operated from the type of power indicated on the marking label If you are not sure of the type of power available consult your dealer or local power company Do not allow anything to rest on the power cord Do not locate this product zwhere persons will walk on the cord If an extension cord is used with this product make sure that the total ampere rating of the equipment plugged into the extension cord does not exceed the extension cord ampere rating Also make sure that the total rating of all products plugged into the wall outlet does not exceed 15 amperes Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage points or otherrisks Refer all servicing to qualified service personnel About this Manual Purpose This user manual gives you all the information you need to operate t
21. tches by the uplink port 4 I FOUDIESNOOTING 4 1 Symptoms and Suggestions Symptoms Possible Reason Suggestions All LEDs are The hub is not receiving 1 Check if the AC power cord off DC power is securely fastened at both ends ands that power is available at the AC outlet 2 Check if the power adapter DC 5V cord is connected to Hub s DC jack Link LED of a 1 The UTP cable is not f1 Check the cable connection connected securely connected port is off 2 The port is bad 2 Try to connect another port 3 If the other party isa 3 Check if the network PC the Network interface card NIC is interface card NIC installed properly could be not working 4 If the other party isa 4 Make sure ALH 616ds hub or LAN switch the normal port is connected to connected ports signal the other hub s or could be cross over switch s uplink port or called cross over port and ALH 616ds uplink port is connected the other s normal port 5 The UTP cable is 5 Try another normal cable broken or it is a cross over cable 100 LED is The auto negotiation 1 Un plug the UTP cable from not lit when function is failed between ALH 616ds and plug in connected to ALH 616ds and the other again a100NIC or party 2 Check if the NIC is set to 100 Hub but anto negotiation mode Link LED is 3 Check if the other hub is set lit to auto negotiation mode 4 if the above steps does not work it is an inter operability problem contact your vendo
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