Lantronix LFH4-M User's Manual
Contents
1. LFH4 M LFH8 M Mini Fast Hubs Installation Guide Table of Contents CHAPTER 1 Introduction 1 1 Product Introduction Lil 2 1 2 PCAs io ir ees ean adds ad a ad a 3 1 9 Pr od ct Sp dficalonS neues ty ches eri 4 CHAPTER 2 Using the LFH Hub D L ll O de oriana 5 2 2 Planning 100BASE TX NetworkS o o o o o o 5 25 o reo 6 2S NOUS ios d PLE eR IER i 8 20 Conmecine LFH TUG atrio 9 CHAPTER 3 LED Indicators SL FOWer LE paso eee pee eee ee CERE ae 11 OZ COMO LED 122 99329995 1 1 12223 2993 2 debes 11 9 9 Link Activity LEDS pros datare zia atalanta 12 24 ParBHON ee fee etri ere redes Eras pra 12 di TBIJS petra oe dero ES Padres ed i Limited Warranty 0 c cee eee eee 13 Technical Support 0 eee eee 13 Declaration of Conformity 15 CHAPTER 1 Introduction 1 1 Product Introduction Congratulations on your purchase of the LFH 4 port or 8 port Mini Fast Ethernet Hub The LFH4 M and LFH8 M are designed to give you the ultimate in flexibility ease of use and reliability The LFH4 M and LFH8 M Mini Fast Ethernet Hubs are 100BASE TX multiport Class II repeaters for use with networks using Unshielded Twisted Pair UTP category 5 cable or Shielded Twisted Pair STP cable The LFH hubs are simple to install and Link Activity Partition and Collision LEDs provide convenient monitoring of the status of the hub and of each port For additional e2. Your LFH4 M or LFH8 M hub is delivered with a mounting bracket The LFH hub can be mounted to the wall or to the surface of a counter top by using the bracket and hanging the LFH hub on the wall using the keyholes provided on the bottom of the hub If mounting the LFH hub is not your preference you may choose to place the LFH hub on a table or wiring closet shelf Use the four self adhesive rubber feet which are provided with the hub for cushioning purposes Place them on the four corners of the bottom surface of the hub 2 5 Connecting the LFH Hub Use the following procedures to connect 100BASE TX network devices to the hub LEH4 M Ports 1 4 LFH8 M Ports 1 8 Uplink Ron m o g S Straight Cable C Crossover cable NOTE If the Uplink Port is being utilized on the LFH hub the adja cent Port may not be used Conversely if that Port is being utilized the Uplink Port may not be connected The following table describes the two cable types TD Make sure that the length of the straight through cable between the LFH hub and the other device does not exceed 100 meters including all patch cables and cross connect wires Make sure that the length of the straight through cable between two hubs does not exceed 5 meters Chapter 3 LED Indicators Figure 3 1 and Figure 3 2 show the LED indicators which indicate the link status of each of the ports whether the LFH hub is receiving power and the presence of network act
3. Copyright 1998 Lantronix All rights reserved No part of the contents of this guide may be transmitted or reproduced in any form or by any means without the written permission of Lantronix Technical Support If problems occur during product operation please check the hub configuration settings cables connectors network terminators and other network components for compatibility Write a description of the problem including what problems occurred and when they occurred Also please have the following information ready if calling for support services Model number amp serial number Purchase date Network configuration Application environment Hardware software NOS and the DOS version Contact Lantronix technical support at 800 422 7044 within the United States or 949 453 3990 outside of the United States Lantronix s tech nical support can also be reached via email at support lantronix com and via www lantronix com or via fax at 949 450 7226 13 WARNING This device complies with part 15 of the FCC rules Operation is subject to the following conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including that which may cause undesired operation Operation of this equipment in a residential area is likely to cause interference in which case the user at his or her own expense will be required to take what ever measures may be required to correct
4. the interference NOTE The RJ45 ports are not for telephone use CAUTION Not for installation in air ducts plenums or other environmental air handling spaces Changes or modifications to this device not explicitly approved by Lantronix will void the user s authority to operate this device 14 Declaration of Conformity according to ISO IEC Guide 22 and EN 45014 Manufacturer s Name Lantronix Manufacturer s Address 15353 Barranca Parkway Irvine CA 92618 USA declares that the product Product Name Mini Fast Hubs Model Number LFH4 M LFH8 M conforms to the following standards EMC EN55022 1988 CISPR 22 1985 Class B EN60555 2 1987 Class A prEN55024 2 1990 1E801 2 1991 4KV CD 8KV AD prEN55024 3 1991 IE801 3 1984 3V V m prEN55024 4 1992 1E801 4 1988 1KV power line 0 5KV signal line Manufacturer s Contact Director of Quality Assurance Lantronix 15353 Barranca Parkway Irvine CA 92618 USA Tel 949 453 3990 Fax 949 453 3995 15 NOTES 16 LAT ROI WIS 15353 Barranca Parkway Irvine CA 92618 949 453 3990 W Fax 949 453 3995 W Sales 800 422 7055 W Support 800 422 7044 PART NO 900 142 Rev A
5. ivity and collisions on the network Figure 3 1 LFH4 M Front Panel LED Indicators PARTITION S LINK ACT Q OY S 4 3 2 1 PORTNO oe Link Activity Figure 3 2 LFH8 M Front Panel LED Indicators l LFH4 M PARTITION r Partition K LINKIACT Link Activity cP 4 3 2 1 PORTNO 10 3 1 Power LED The green LED on the front panel labeled PWR is used to indicate that the LFH hub is receiving power and is turned on If the LED is off check the following to isolate the problem w Make sure the power cord is properly connected to the power outlet and is properly inserted into the power connection on the LFH hub V Determine whether or not the outlet is functional by plugging another device into the receptacle 3 2 Collision LED The yellow collision LED is located on the front panel and is labeled COL This indicates that two or more stations on the network attempted to transmit at the same time When a collision occurs all of the stations involved will recognize the collision wait a random amount of time and re transmit Collisions are normal in Ethernet networks though excessive collisions may indicate that your network is overly congested Other network problems can cause excessive colli sions including v Workstation cables exceeding the maximum length of 100 meter
6. ntire cable plant meets specifications Figure 2 1 LFH4 M 100BASE TX Network Example 2 3 Installation The LFH Mini Fast Ethernet Hubs are easy to install and require no special training You should however read the following instructions carefully before proceeding to install your hub Figures 2 2 and 2 3 show the layout of the front panels Figure 2 2 LFH4 M Front Panel PARTITION LINK ACT 4 3 2 1 PORT NO PARTITION LINK ACT A 3 DI di PORT NO The LFH Mini Fast Ethernet Hubs were designed for easy plug and play installation Before you connect the LFH to other devices there are several issues you should keep in mind w When connecting the LFH to a workstation using unshielded twisted pair cable you must make sure that the cable length is not greater than 100 meters v When you connect two LFH hubs you must make sure that the link between them is not longer than 5 meters v Network cable segments can be connected to or disconnected from the hub while the power is on Plugging in or removing network cables while your hub is operating will not interrupt the operation of the hub w When placing your LFH hub you need to avoid dusty locations and electromagnetically noisy areas 2 4 Mounting
7. s w A total network diameter exceeding the maximum 205 meters v Faulty Fast Ethernet adapters or other equipment on the network 11 3 3 Link Activity LEDs The Link Activity LEDs on the front panel are associated with indi vidual ports indicating whether a device is detected on the other end and whether or not the port has been automatically partitioned off The LFH hub monitors each port on the hub to determine whether or not there is a device on the other end If the cable is connected to a port and a link is detected the LED will light otherwise the LED will not light and the transmit and receive functions of the port will be disabled 3 4 Partition LED The yellow Partition LED is located on the front panel and labeled as PARTITION When there are too many collisions received from a specific station s the hub will automatically partition it to prevent the data transmission from other ports to those specific ports When this port is partitioned the LED will be turned on 3 5 System Status LEDs LED summary table ON Unit is receiving power PARTITION ON Port is partitioned COL Yellow ON Collision occurred OFF No collisions LINK ACT ON Good link Flashing Activity 12 Limited Warranty The LFH4 M and LFH8 M come with 5 year limited warranties To obtain Lantronix s full warranty statement or if you experience prob lems with your unit check our website www lantronix com or call Lantronix for assistance
8. ta at 100Mbps so a 100BASE TX network requires a 100BASE TX hub 100BASE TX supports a maximum length of 100 meters from a network station to a hub The total network diameter the maximum cable distance between any two stations on the network is 205 meters for 100BASE TX as opposed to 500 meters for 10Mbps Ethernet Because 100BASE TX sends signals ten times faster than 10BASE T the collision window the time during which the network can detect a collision between packets is reduced to one tenth the duration of the 10BASE T collision window making the maximum network diameter smaller In a repeater environment 100BASE TX only allows a single layer of cascaded hubs Switching hubs such as Lantronix s LSW8FA may increase the network diameter for 100BASE TX networks by buffering data packets Each port can be connected to a separate LAN segment each with a maximum diameter of 205 meters thereby increasing the overall 100BASE TX network diameter Not only does 100BASE TX have a different data transmission scheme it also has different cabling requirements As previously noted 100BASE TX requires data grade Category 5 UTP cable Some installations have Category 5 cabling but do not have wall outlets and wiring closet punch down blocks that meet Category 5 require ments 100BASE TX requires that all wiring and accessories meet EIA TIA 568B specifications for proper operation When wiring a 100BASE TX network make sure that the e
9. xpansion the hub offers an Uplink port that makes it easy to cascade the hub to another Fast Ethernet hub The LFH4 M LFR8 M hubs can be placed on a tabletop or wall mounted and provide the ideal solution for small to medium 100BASE TX Fast Ethernet networks The LFH hubs are designed to comply with the IEEE 802 3u Fast Ethernet standard To insure network reliability the LFH4 M and LFH8 M monitor each port for signal quality and automatically disconnect stations transmit ting noise reconnecting them when the problem is resolved Data packets that exceed the maximum legal length for IEEE802 3 Ethernet packets are automatically truncated This prevents a device from blocking the network by transmitting a continuous data stream or excessively long packet The LFH hubs completely retime and restore full amplitude waveforms for each retransmitted packet A full length preamble is also generated insuring packet integrity across the network 1 2 Features v The LFH4 M provides four 100BASE TX ports and the LFH8 M provides eight 100BASE TX ports for Fast Ethernet connectivity The LFH4 M LFH8 M comply with the IEEE 802 3u Fast Ethernet standard Supports Category 5 Unshielded Twisted Pair UTP or Shielded Twisted Pair STP cable An Uplink port on the front panel enables the LFH4 M LFH8 M to be connected to another 100BASE TX hub using a straight through cable Performs preamble regeneration signal retiming and restoration e
10. xtension of fragmented packets automatic partitioning and jabber truncation Global Power and Collision LEDs and individual Partition and Link Activity LEDs indicate system status Comes with external AC DC power supply 120VAC or 220VAC FCC Class A CE UL CUL TUV certifications Five year limited warranty 1 3 Product Specifications Standards IEEE 803 3u 100BASE TX Ethernet Network Media 100BASE TX Unshielded Twisted Pair cabling Category 5 UTP Max Lengths 100 meter hub to station connection 5 meter hub to hub connection Connectors 8 16 RJ45 connectors one crossover Uplink port LED indicators Power Collision Partition Link Activity Dimensions 221mm x 111mm x 26mm L x W x H Environment Temperature Operating 0 C to 40 C Storage 20 C to 70 C Operating 10 to 80 RH Storage 5 to 90 RH Certifications FCC Class A CE UL CUL TUV 5 year limited Chapter 2 Using the LFH Hub 2 1 Packing Checklist Your LFH package should contain the following Y An LFH4 M or LFH8 M Mini Fast Hub Y Mounting brackets and screws V External AC DC power adapter 120VAC or 220VAC V Installation Guide If any of these items are missing contact your dealer immediately 22 Planning 100BASE TX Networks 100BASE TX networks need to be planned out slightly differently from 10BASE T networks because new hubs and new wiring configurations are necessary IOBASE T hubs are incapable of sending or receiving da
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