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DFE-904

Ethernet/Fast Ethernet

Dual-Speed Hub

User’s Guide

Rev. 01 (November 1997)

6DFE904...01

Printed In Taiwan

RECYCLABLE

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Summary of Contents for DFE-904

Page 1: ...DFE 904 Ethernet Fast Ethernet Dual Speed Hub User s Guide Rev 01 November 1997 6DFE904 01 Printed In Taiwan RECYCLABLE ...

Page 2: ...o 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 generates uses and can radiate radio frequency energy and if not installed and used in accordance with this guide may cause harmful interference to...

Page 3: ...Card must be completed and returned to D Link within ninety 90 days of purchase Warranty service may be obtained by contacting a D Link office within the applicable warranty period for a Return Material Authorization RMA number If a Registration Card has not been previously sent proof of purchase such as a copy of the dated purchase invoice must be provided Once an RMA number is issued the defecti...

Page 4: ...R 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 OTHER INCIDENTAL CONSEQUENTIAL OR INDIRECT DAMAGES ARISING OUT THE INSTALLATION MAINTENANCE USE PERFORMANCE FAILURE OR INTERRUPTION OF A D LINK PRODUCT HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY THIS LIMITATION WILL APPLY EVEN IF D LINK HAS BEEN ADVISE...

Page 5: ... Identifying External Components 4 Front Panel 4 Side Panels 6 Back Panel 7 Installing the Hub 9 Single hub Network 9 Multi hub Ethernet Network 11 Two hub Fast Ethernet Network 13 Mounting 14 Horizontal Mounting 15 Vertical Mounting 15 Powering Up 17 Specifications 18 ...

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Page 7: ...ration and integration between 10 Mbps Ethernet and 100 Mbps Fast Ethernet The DFE 904 hub can operate with 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 operating at 100 megabits per second Product Description The DFE 904 is two hubs in one an Ethernet hub that works at 10 megabits ...

Page 8: ... 100BASE TX means that signals cross from the sender s transmit lines to the receiver s receive lines this crossover occurs within the hub 10BASE T has crossover also but no X the X was added to distinguish 100BASE TX from 100BASE T4 a Fast Ethernet standard with no crossover 100BASE TX Class II hubs can be connected to each other using twisted pair cabling Class I hubs cannot A twisted pair conne...

Page 9: ...he DFE 904 is the type of hub technically known as a multi port repeater or repeating hub Unless preceded by the word switching the word hub in this guide always refers to a repeating hub When used as a 100BASE TX Fast Ethernet hub the DFE 904 can interconnect either a four end nodes or b three end nodes and another hub These are the only connection methods allowed by the 100BASE TX standard for h...

Page 10: ... damaged or missing report the problem immediately to your computer equipment 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 indicator panel is described in detail in the next chapter Front Panel On the DFE 904 s front panel are the hub s Speed L...

Page 11: ... green to show link OK note that the device must be turned on for the connection to be detected When the hub detects a transmission from a correctly operating device the Link Rx indicator for the port blinks off and on to show receiving Rx Technical Note A Link Rx indicator blinks only when signals come in on a port not when signals go out Valid signals received on one port are immediately sent ou...

Page 12: ...orrectly Partitioning prevents a malfunctioning device from disrupting the network Automatic partitioning and departitioning are required features of Ethernet and Fast Ethernet hubs The term collision domain is often used to describe an Ethernet or Fast Ethernet network A collision domain is a collection of end nodes whose signals can collide End nodes connected to the same hub or to uplinked hubs...

Page 13: ...he hub Important Never block the air inlets or the fan outlet Cooling is extremely important for the hub Back Panel On the back of the hub starting at the end closest to the fan are the hub s DC power jack and five RJ 45 jacks labeled 1 2 3 4 and Uplink The DC power jack is marked with the voltage amperage and polarity required by the hub 9V DC 1A inside positive outside negative This jack takes a...

Page 14: ...end node Note that such a connection will require a cross wired jack the kind that is wired for an end node on the other hub Use only standard straight through UTP or STP cables with the DFE 904 Category 3 4 and 5 cables are all acceptable for 10 Mbps only Category 5 and equivalent cables are acceptable for 100 Mbps Network cables can be attached and detached at any time whether the hub is on or o...

Page 15: ... hub network that runs at 10 Mbps If your network runs at 100 Mbps and you wish to connect another 100BASE TX Class II hub to the DFE 904 see the third section of this chapter Caution A twisted pair network cable can ordinarily be connected or disconnected at any time whether the devices are on or off Where an end node has a plug in adapter however we strongly recommend turning the end node off be...

Page 16: ... node will access the network at the same speed as the hub and your other end nodes 10 or 100 Mbps Check the setting of the DFE 904 s speed switch and the specifications for the end node s network interface 2 Select a cross wired RJ 45 jack on the hub This can be any one of the jacks labeled 1 through 4 3 Plug one end of the cable into the end node s RJ 45 jack Align the plug so its contacts will ...

Page 17: ... the hubs are DFE 904 units If you have 10BASE T hubs of other kinds as well see those hub s manuals for instructions on making end node and uplink connections All 10BASE T hubs allow uplinking On some however you must set a switch to make a jack suitable for uplinking and on some the jack used for uplinking is labeled not Uplink but MDI II medium dependent interface uncrossed Interconnecting Two ...

Page 18: ...ou must leave hub B s Uplink jack unused Connect end nodes to the hubs as described under Single hub Network above but leave jack 4 on hub A and the Uplink jack on hub B unused The following figure shows a two hub 10 Mbps network on which all possible connections to both hubs have been made Connecting Additional Hubs To add a third and a fourth hub to a 10 Mbps network connect them between hubs A ...

Page 19: ... hub Fast Ethernet Network When set for 100 Mbps operation the DFE 904 can have a single uplink connection to another 100BASE TX Class II Fast Ethernet hub In addition to the 100 meter 328 foot absolute limit on the length of any single cable there must not be more than 205 meters 672 4 feet of cabling between any two end nodes This is shown in the following illustration ...

Page 20: ...location to each device you will connect to the hub Make sure all connections can be made using cables of allowable lengths On a 10 Mbps Ethernet network every cable can be up to 100 meters 328 feet long If hubs are uplinked together there can be no more than three uplink connections between any two end nodes On a 100 Mbps Fast Ethernet network with no uplink connection that is just the DFE 904 an...

Page 21: ... the hub s bottom surface one in each corner Then set the hub in place and make sure it will not easily rock or slide Also make sure nothing will press against the air inlets or the fan outlet Vertical Mounting To mount the hub on a vertical surface you will need a medium size Phillips screwdriver You might also need a drill a drill bit suitable for the supplied wall anchors and a hammer We strong...

Page 22: ...r image when the hub s base faces the wall instead of facing you 3 Hammer the supplied wall anchors all the way into the holes in the mounting surface 4 Drive the supplied screws most of the way into the wall anchors Let the screwheads protrude enough to enter the holes in the hub s base To mount the hub position it so the screwheads enter the holes in its base then slide it downward and sideways ...

Page 23: ...as the correct type of barrel connector for the hub s DC power jack Important Double check the input rating of the supplied power adapter to make sure it matches the line voltage in your area If it does not contact your computer equipment dealer and obtain a replacement adapter When certain that the power adapter is suitable plug the adapter into a standard wall outlet and plug the adapter s barre...

Page 24: ...cabling between stations 500 m Fast Ethernet Category 5 or better UTP or STP cable max cable length 100 m max cabling between stations 205 m Indicators 10 Mbps 100 Mbps collision port link activity Power Supply External power supply with 9V DC 1A output Power Consumption 4W Dimensions W D H 110 75 29 mm 4 33 2 95 1 14 in Weight 500 g Operating Temperature 10 to 55 C Storage Temperature 25 to 55 C ...

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