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Dual-Speed Stackable Hubs User’s Guide

Making Connections

17

4

4

M

AKING

C

ONNECTIONS

This chapter discusses how to make connections to the hub’s twisted-pair
ports, cascading hubs to create a stack, and linking with other hubs (or hub
stacks).

Hub Cascading/Building a Stack

You can stack up to five hubs using the daisy-chain ports to form one logi-
cal hub. In this configuration, the interconnected hubs constitute a single
logical unit, providing a maximum of 40 twisted-pair ports.

Use the provided daisy-chain cable to connect the Daisy-Chain OUT port
on the rear panel of one hub to the Daisy-Chain IN port on the hub below
it, as shown in the figure below. Repeat this procedure for each hub to be
included in the stack.

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Summary of Contents for DFE-908x

Page 1: ...DFE 908x DFE 908 Ethernet Fast Ethernet Dual Speed Stackable Hubs User s Guide Rev 01 December 1997 6DFE908 01 Printed In Taiwan RECYCLABLE ...

Page 2: ...ich am Geräten befinden sind zu beachten 12 Wird das Gerät über einen längeren Zeitraum nicht benutzt sollten Sie es vom Stromnetz trennen Somit wird im Falle einer Überspannung eine Beschädigung vermieden 13 Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder Flüssigkeiten in das Gerät gelangen Dies könnte einen Brand bzw Elektrischen Schlag auslösen 14 Öffnen Sie niemals das Gerät Das Ge...

Page 3: ...T IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY THE CUSTOMER S OR ANY THIRD PERSON S MISUSE NEGLECT IMPROPER INSTALLATION OR TESTING UNAUTHORIZED ATTEMPTS TO REPAIR OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE OR BY ACCIDENT FIRE LIGHTNING OR OTHER HAZARD LIMITATION OF LIABILITY IN NO EVENT WILL D LINK BE LIABLE FOR ANY DAMAGES INCLUDING LOSS OF DATA LOSS OF PROFITS COST OF COVER OR OT...

Page 4: ...ation RMA number If a Registration Card for the product in question has not been returned to D Link then a proof of purchase such as a copy of the dated purchase invoice must be provided If Purchaser s circumstances require special handling of warranty correction then at the time of requesting RMA number Purchaser may also propose special procedure as may be suitable to the case After an RMA numbe...

Page 5: ...tems Inc All other trademarks belong to their respective proprietors Copyright Statement No part of this publication may be reproduced in any form or by any means or used to make any derivative such as translation transformation or adap tation without permission from D Link Corporation D Link Systems Inc as stipulated by the United States Copyright Act of 1976 ...

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Page 9: ...n 1 Product Features 2 Dual speed Fast Ethernet Ethernet Hub Technology Overview 3 100BASE TX Technology Overview 5 100Mbps Fast Ethernet Introduction 5 Cables and Connectors 5 Topology 6 Network Diameter 6 Hub Types 7 2 UNPACKING AND SETUP 7 Unpacking 8 Identifying External Components 8 Front Panel 8 Rear Panel 10 Installing the Hub 11 Installation 11 3 UNDERSTANDING INDICATORS 12 ...

Page 10: ... 4 MAKING CONNECTIONS 17 Hub Cascading Building a Stack 17 Connectivity Rules 18 Hub to End Station Connection 19 Hub to Hub Uplink 21 5 CABLES AND CONNECTORS 23 100BASE TX Ethernet Cable and Connectors 23 Crossover Cables 24 6 SPECIFICATIONS 26 General 26 Hub to Hub Cascading 26 LED Indicators 27 Environmental and Physical 27 0 ...

Page 11: ... numbers are normally used only to differentiate between the two where necessary Unless differentiated by model number all information applies to all mod els Overview of the User s Guide Chapter 1 Introduction Provides information on Fast Ethernet net works and introduces the features of the DFE 908 series hubs Chapter 2 Unpacking and Setup Helps you get started in setting up the hub Chapter 3 Und...

Page 12: ...rmation on connect ing to the hub s twisted pair stacking hubs and linking with other 100BASE TX hubs Appendix A Cables and Connectors Provides specifications on the cables and connectors used with the hubs Appendix B Specifications Lists the hubs specifications ...

Page 13: ...either IEEE 802 3 10BASE T connections twisted pair Ethernet operating at 10 megabits per second or IEEE 802 3u 100BASE TX connections twisted pair Fast Ethernet oper ating at 100 megabits per second All of the twisted pair ports support Auto Negotiation NWay allowing the hub to automatically detect the speed of a network connection This means you can connect all of your Ethernet and Fast Ethernet...

Page 14: ...thernet and 802 3u 100BASE TX Fast Ethernet industry standards for interoperability with other Ethernet Fast Ethernet network devices Ethernet connections support Category 3 or better twisted pair ca bles Fast Ethernet connections support both shielded twisted pair and Category 5 unshielded twisted pair cables Fast Ethernet connections support a maximum distance of 100 me ters from end station to ...

Page 15: ...upply Automatic voltage selection 100V to 240V 50 or 60Hz without fuses to change or a voltage switch to set Stackable to five units or total 40 port capability Scaleable expansion up to two stacks or a total of 78 ports Dual speed Fast Ethernet Ethernet Hub Technology Overview Dual speed Ethernet hubs have been developed to make it simpler to plan networks containing both 10Mbps Ethernet and 100M...

Page 16: ... at the same speed 10Mbps Repeater 100Mbps Repeater NWay Detection RJ 45 Ports 100Mbps Ethernet Station 100Mbps Ethernet Station 10Mbps Ethernet Station 10Mbps Ethernet Station 100Mbps Ethernet Station If there is a DFE 908x hub present in the stack its built in switch serves as a bridge between the two independent segments ...

Page 17: ...net users in part because it does not require a protocol translation when sharing data with 10Mbps Ethernet Fast Ethernet is a relatively new standard specified by the IEEE 802 3 LAN committee It is an extension of the 10Mbps Ethernet standard with the ability to transmit and receive data at 100Mbps while maintaining the CSMA CD Ethernet protocol Since Fast Ethernet is compatible with all 10Mbps E...

Page 18: ...ure of Fast Ethernet networks The EIA TIA 568 Wiring Standard imposes a 100 meter limit on horizontal runs of twisted pair cables that is connections from the wiring closet to the end station Fast Ethernet s increased operational speed reduces the maximum distance between all elements of the LAN see below The EIA TIA 568 Wiring Standard does not support the use of co axial cables for horizontal wi...

Page 19: ...media Only one Class I hub can exist within the same collision domain thus this type of hub cannot be directly interlinked A Class II repeater on the other hand immediately repeats all incoming line signals on one port to the other ports no translations are performed This type of hub connects identical media within the same collision domain for example TX to TX At most two Class II hubs can exist ...

Page 20: ... cable Four rubber feet to be used for shock cushioning This User s Guide Inspect the hub and all accompanying items If any item is damaged or missing report the problem immediately to your D Link dealer Identifying External Components This section identifies all the major external components of the hub Both the front and rear panels are shown followed by a description of each panel feature The in...

Page 21: ...ts If you need to connect to another device with MDI X ports such as another hub or an Ethernet switch you should use a crossover cable or connect using the Uplink port described below For more information about crossover connection see the Crossover Cables section on page 24 Uplink Port The Uplink port is an MDI port which means you can connect the hub or hub stack to another device with MDI X po...

Page 22: ...first and last hubs in the stack use only one of the daisy chain ports while the others use both Daisy Chain OUT Port Works in conjunction with the Daisy Chain IN Port see above Con nect this port to the Daisy Chain IN Port of the next hub in the stack usually placed immediately below it using the enclosed daisy chain cable Fan Provides air circulation and heat dissipation Be sure to leave adequat...

Page 23: ...humidity operat ing ranges Install the hub stack in a site free from strong electromagnetic field generators such as motors vibration dust and direct exposure to sunlight Leave at least 10cm of space at the front and rear of the hub for ventilation Install the hub on a sturdy level surface that can support its weight When installing the hub stack on a level surface attach the rubber feet to the bo...

Page 24: ...NG INDICATORS Before connecting network devices to the hub take a few minutes to look over this section and familiarize yourself with the front panel LED indica tors of your dual speed hub depicted below Hub State Indicators Power Indicator PWR ...

Page 25: ...vide a quick reference on the current traf fic load relative to the total available 10Mbps or 100Mbps network bandwidth The graphs display a measure of the percentage of band width in use on the respective network segment All data packets are counted whether valid or not Port State Indicators There is one port state indicator for each of the twisted pair ports on the hub Each port s LED status ind...

Page 26: ...atically partitioned the port will be isolated from the rest of the network segment When the problem is corrected or a valid data packet is received through the port the port is automatically reconnected Port Speed Indicators There is also a port speed indicator for each of the twisted pair ports on the hub A port s speed indicator should light green when a 100BASE TX de vice is connected to the p...

Page 27: ...Dual Speed Stackable Hubs User s Guide Understanding Indicators 15 ...

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Page 29: ...ding a Stack You can stack up to five hubs using the daisy chain ports to form one logi cal hub In this configuration the interconnected hubs constitute a single logical unit providing a maximum of 40 twisted pair ports Use the provided daisy chain cable to connect the Daisy Chain OUT port on the rear panel of one hub to the Daisy Chain IN port on the hub below it as shown in the figure below Repe...

Page 30: ...o the stack or removed from the stack while the power is on to any hub in the stack Always turn off power to the entire stack before adding or removing hubs Connectivity Rules Ethernet 10Mbps networks need to respect the following connectivity rules ...

Page 31: ... Ethernet 100Mbps networks need to respect the following connec tivity rules The maximum length of a twisted pair segment that is the distance between a port in the hub to a single address network device such as a PC server or Ethernet switch is 100 meters Cabling and other wiring should be certified as Category 5 or shielded twisted pair STP The maximum diameter in a collision domain is about 205...

Page 32: ...and other single address network devices to the eight twisted pair ports using straight through twisted pair cables These cables should not be crossed over The follow ing figure illustrates the pin assignments for a straight through cable When connecting a PC or a server the system being connected should have an Ethernet or Fast Ethernet network interface card with a twisted pair port The followin...

Page 33: ... pair cable The Uplink port is shared with Port 1 and you should not use both Port 1 and the Uplink port at the same time When connecting two hubs or hub stacks in this fashion the maximum distance between any two end stations in a collision domain is 205 meters If each link between the hub and an end station is 100 meters then the hub to hub connection is limited to 5 meters However if the longes...

Page 34: ...raight Through Uplink Switch or Hub Non Uplink Straight Through Uplink Crossover X Server or PC Crossover X A crossover cable is a straight through twisted pair cable in which the wires have been crossed The figure below shows the pin assignments for an Ethernet or Fast Ethernet crossover cable NOTE The first twisted pair port Port 1 is shared with the Uplink port If you connect a hub to the Uplin...

Page 35: ...et Cable and Connectors Cable characteristics 0 4 to 0 6 mm 22 to 26 AWG 4 pair only two pairs or four wires are used for 100BASE TX Category 5 un shielded twisted pair or EIA TIA 568 compliant 100 ohm shielded twisted pair Maximum segment length 100 meters Maximum network diameter 205 meters Connector RJ 45 ...

Page 36: ... hub through the UTP port a modified crossover cable is necessary With a crossover cable two pairs of wires are switched at one connector end Carry out the following steps to create a customized crossover twisted pair cable 1 Leave one end of the cable as is with the RJ 45 connector intact The wiring at just one end of the cable needs to be modified 2 At the other end of the cable connect wires 1 ...

Page 37: ...Dual Speed Stackable Hubs User s Guide Cables and Connectors 25 ...

Page 38: ...otocol CSMA CD Network Data Transfer Rate Ethernet 10Mbps Fast Ethernet 100 Mbps Number of Ports per Hub 8 all dual speed 10Mbps 100Mbps Network Cables 10BASE T 2 pair UTP Cat 3 4 5 100 m EIA TIA 568 100 ohm screened twisted pair STP 100 m 100BASE TX 2 pair UTP cat 5 100 m EIA TIA 568 100 ohm screened twisted pair STP 100 m Hub to Hub Cascading Number of Daisy Chained Hubs Maximum of 5 hubs per st...

Page 39: ...100Mbps Environmental and Physical Power Supply 100 to 240 VAC 50 or 60 Hz internal universal power supply Power Consumption DFE 908x 10 watts max DFE 908 10 watts max Dimensions 233mm 141mm 44mm 9 2 5 6 1 7 inches Weight 1 2 kg 2 6 lb Operating Temperature 10 to 55 C 14 131 F Storage Temperature 25 to 55 C 13 131 F Humidity 5 to 95 non condensing DC Fan 40mm 40mm DC Fan 1 Emissions FCC Class B CE...

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Page 41: ...DENMARK Naverland 2 DK 908 Glostrup Copenhagen Denmark TEL 45 43 969040 FAX 45 43 424347 SINGAPORE D LINK SINGAPORE PTE LTD 77 Science Park Drive 03 03 CINTECH III Singapore Science Park Singapore 118256 EL 65 7746233 FAX 65 7746322 AUSTRALIA D LINK AUSTRALIA PTY LTD Unit 16 390 Eastern Valley Way Roseville NSW 2069 Australia TEL 61 2 94177100 FAX 61 2 94171077 CHINA D LINK BEIJING 15th Floor Scie...

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Page 43: ...your product 1 Where and how will the product primarily be used Home Office Travel Company Business Home Business Personal Use 2 How many employees work at installation site 1 employee 2 9 10 49 50 99 100 499 500 999 1000 or more 3 What network protocol s does your organization use XNS IPX TCP IP DECnet Other_____________________________ 4 What network operating system s does your organization use...

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