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D-Link DFE-904 User Manual
Summary of 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: Trademarks
Trademarks copyright 1997 by d-link corporation. Contents subject to change without prior notice. D-link is a registered trademark of d-link corporation and d-link systems, inc. All other trademarks belong to their respective owners. Copyright statement no part of this publication may be reproduced ...
Page 3: Limited Warranty
Limited warranty hardware: d-link warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from d-link or its authorized reseller: product type period network adapters lifetime unman...
Page 4: Limitation Of Liability
Connection with the sale, installation maintenance or use of d-link's products d-link shall not be liable under this warranty if its testing and examination disclose that the alleged defect in the product does not exist or was caused by the customer's or any third person's misuse, neglect, improper ...
Page 5: Ontents
C ontents introduction..................................................................................... 1 product description......................................................................... 1 unpacking and setup ...................................................................... 3 id...
Page 7: Introduction
1 introduction this guide explains how to set up and use the d-link dfe-904 ethernet/fast ethernet mini-hub. The dfe-904 is a sophisticated device that must be installed and operated as described in this guide to work correctly. Follow the instructions in this guide carefully to ensure that your dfe...
Page 8
2 standards for 10-mbps ethernet and 100-mbps fast ethernet are administered by the international institute of electrical and electronics engineers (ieee). The dfe-904 conforms fully to ieee standards for hubs of its type. As a 10-mbps ethernet hub, the dfe-904 conforms to the ieee's 10base-t standa...
Page 9: Unpacking and Setup
3 when used as a 10base-t ethernet hub, the dfe-904 can interconnect end nodes and other 10base-t hubs in many different combinations, as long as the connection rules given in this guide are followed. Most often, the hub is used either (a) to interconnect four end nodes, or (b) to interconnect three...
Page 10: Front Panel
4 open the shipping carton of your hub and carefully unpack the contents. The carton should contain the following items: ♦ one dual-speed hub ♦ one ac power adapter, suitable for your area electrical power connections ♦ mounting accessories (rubber feet, screws, and wall anchors) ♦ this user’s guide...
Page 11
5 the speed indicators are labeled 100 and 10 . These indicators show whether the hub is set for 100-mbps or 10-mbps operation. Hub speed is set using a side- panel switch described in the next section. The speed indicators also serve as power indicators. One or the other should shine whenever the h...
Page 12: Side Panels
6 ethernet and fast ethernet. If collisions become very frequent, the cause might be faulty cabling, network overload, or a malfunctioning device. Important: if too many consecutive transmissions from a device result in collisions, the hub will partition the port the device is connected to — that is...
Page 13: Back Panel
7 the speed switch is marked 100 m (for 100-mbps fast ethernet) at one end and 10 (for 10-mbps ethernet) at the other. To prevent accidental changing of the setting, the switch tab protrudes only slightly. A groove in the tab lets you set the switch with a fingernail or pencil tip. Slide the tab tow...
Page 14: Bottom Panel
8 jacks 1, 2, 3, and 4 are rj-45 connectors for the hub's network ports. Each is wired to work with a cable from a network end node or from another hub's uplink jack. The uplink jack is an rj-45 jack wired for an uplink connection to another hub. This jack is part of the same circuit as jack 4; neve...
Page 15: Installing The Hub
9 the square outlines show where to attach the rubber feet included with the hub. The feet help to cushion the hub, and should be attached whether you set the hub on a desk, table, etc., or mount it on a vertical surface. Installing the hub when you connect only end nodes to the dfe-904, connections...
Page 16
10 for the purpose of making connections to the dfe-904, a bridge, router, or switching hub (also known as a "switch") is considered an end node. Such a device acts as an end node in each of two or more collision domains, making them seem like a single network. Before making connections, check the r...
Page 17: Multi-Hub Ethernet Network
11 multi-hub ethernet network if all your end nodes will access the network at 10 mbps and you will connect the dfe-904 to one or more other hubs, make connections as described in this section. Before making connections, check the rules and precautions and the mounting instructions given in this gui...
Page 18
12 2. Set both hubs for 10 mbps. 3. Make sure jack 4 on hub a is unused. This jack must remain unused after all connections are made. 4. Plug one end of a suitable cable into hub a's uplink jack. Use the same kind of cable as you would use for a 10base-t end node. 5. Plug the other end of the cable ...
Page 19
13 will be no more than three uplink connections between any two end nodes. The following illustration shows a maximum-extent 10-mbps network created with dfe-904 units. Two-hub fast ethernet network when set for 100-mbps operation, the dfe-904 can have a single uplink connection to another 100base-...
Page 20: Mounting
14 mounting you can mount the dfe-904 on a desk, table, or other firm horizontal surface, or on a vertical surface such as a wall or the side of a desk. Important: choose a location where the air inlets and fan outlet will never be blocked. Make sure the hub will not be exposed to direct sunlight, s...
Page 21: Horizontal Mounting
15 can be more than 100 meters (328 feet) long, and the signal path between any two end nodes must not exceed 205 meters (672.4 feet). If both hubs have end nodes connected through 100-meter-long cables, the uplink cable cannot be more than 5 meters (16.4 feet) long. Horizontal mounting prepare the ...
Page 22
16 these holes' centers are 65m (2.56 in.) apart, at the corners of an imaginary rectangle with sides 53 mm and 37 mm (2.1 in. And 1.46 in.) long. 2. Drill holes in the corresponding positions on the mounting surface. Remember that the hole positions are reversed as in a mirror image when the hub's ...
Page 23: Powering Up
17 powering up the dfe-904 and connected devices can be powered up in any order. Before powering up the dfe-904, make sure that — - the hub is set to work at the speed at which all connected devices will access the network; - the ac adapter is designed for the line voltage and the kind of ac outlet ...
Page 24: Specifications
18 specifications standards: ieee 802.3 10base-t ethernet repeater, ieee 802.3u 100base-tx fast ethernet repeater (class ii). Topology: star. Protocol: csma/cd. Data transfer rate: ethernet—10 mbps; fast ethernet—100 mbps. Number of ports: four. Network media: ethernet—category 3 or better utp or st...