D-Link DFE-916X User Manual

DFE-916x
DFE-916

Ethernet/Fast Ethernet

Dual-Speed Stackable Hubs

User’s Guide

Rev. 02 (January, 1998)

6DFE916...02

Printed In Taiwan

RECYCLABLE

Wichtige Sicherheitshinweise

1. Bitte lesen Sie sich diese Hinweise sorgfältig durch.

2. Heben Sie diese Anlei tung für den spätern Gebrauch auf.

3. Vor jedem Reinigen ist da s Gerät vom St romne tz zu trennen. V ervenden Sie kei ne Flüssig- oder
Aerosolrei niger. Am besten dient ein ange feuchtetes T uc h z ur Reinigung.

4. Um eine Be schädigung des Gerätes zu vermeiden sollten Sie nur Zubehörteile verwenden, die vom
Hersteller zugelassen sind.

5. Das Gerät is vor Feucht igkeit zu schützen.

6. Bei der Aufstellung des G erätes ist auf sichern Stand zu achten. Ein Kippen oder F allen könnte
Verletzunge n he rvorrufe n. Verwenden Sie nur sichere Standorte und beachten Sie die Aufstellhinweise
des Herstellers.

7. Die Bel üftungsöffnungen dienen zur Luftzirkulation die das Gerät vor Überhitzung schützt. Sorgen S ie
dafür, daß diese Öffnungen nicht abge de ckt werden.

8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.

9. Die Netzanschlußsteckdose muß aus Gründen der elektrischen Sicherheit einen Schutzleiterkontakt
haben.

10. Verlegen Si e die Netzanschlußleit ung so, daß niemand darübe r fallen kann. Es sollete a uc h nichts auf
der Leitung abgestellt werden.

11. Alle Hinweise und Wa rnungen die sich am G eräten befinden s ind zu beachten.

12. Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz trennen.
Somit wird im Falle ei ner Überspannung eine Beschädigung ve rmieden.

13. Durch die Lüftungs öffnungen dürfen niemals Gegenstände ode r Flüssigkeiten in das G e rä t gelangen.
Dies könnte einen Brand bz w . Elektrischen Schlag auslösen.

14. Öffnen Sie nie ma ls das Gerät. Das Gerä t darf aus Gründen der elektrischen S icherheit nur von
authorisiertem Servicepersonal geöffnet werden.

15. Wenn folgende S ituationen auft reten ist da s Gerät vom Stromnetz zu trennen und von einer qualifizierten
Servicestelle zu überprüfen:

a– Netzkabel ode r Netzstec ke r sint beschä digt.
b– Flüssigkeit ist in das Gerät e ingedrungen.
c– Das Gerät war Feuchtigkeit ausgesetzt.
d– Wenn das Gerät nicht der Bedienungsanle itung ensprechend funktioniert oder Sie mit Hilf e dieser

Anleitung keine Verbess e rung e r z ielen.
e– Das Gerät ist gefal len und/oder das Ge hä use ist beschädigt.
f– Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.

16. Bei Re pa ra turen dürfen nur Orginale rsatzteile bzw. den Orginalteile n entsprechende Te ile verwendet
werden. Der Einsatz von ungeeigneten Ersat zteilen kann eine weitere Beschädigung he rvorrufe n.

17. Wenden Sie sich mit all en Fragen die Service und Repartur betreffen an Ihren Servic e pa rtner. Somit
stellen Sie die Betriebssicherheit des Gerätes sicher.

ii

Limited Warranty

Hardware:

D-Link warrants its hardware products to be free from de fects in workmanship and materials, under normal
use and servi c e , for the following lengths of time from the date of purchase from D-Link or its Aut horized
Reseller:

Product Type Warranty
Network adapters Lifetime
Unmanaged and managed hubs (10Mbps) Lifetime *
Unmanaged hubs (100Mbps) Lifetime *
Managed hubs (100Mbps) One year

Unmanaged and managed dual-speed hubs (10Mbps / 100Mbps) One year
Repeater s, MAUs , transcei ve rs, media conve rters One year

Concentrators One year
Internetworking produc ts One year
* Power supply a nd fa ns in these de vices One year
Other hardware produc ts One year
Spare parts and spare kits 90 days
If a product does not ope ra te as warranted during the appli c a ble warranty period, D-Link shal l, at its option
and expense, (1) re pair the defect ive product or part, (2) de liver to Cus tomer an equivalent product or part to
replace the defective item. All products that are re placed will become the property of D-Link. Replacement
products may be new or reconditioned. Any replaced or repaired product or part has a ni ne ty (90) day war­ranty or the remainder of the initial warranty period, whichever is longer.
D-Link shall not be responsi bl e for any software, firmware, informat ion, or memory data of Customer con­tained in, stored on, or inte grated with any products returned to D -L ink pursuant to any wa rra nty.
All products w ith lifetime warranty have a s tandard five-year warranty. To qualify for l ifetime warranty, the
enclosed P roduct Registration Card must be complete d a nd re turned to D-Link wi thin ninety (90) days of
purchase.
Warranty s e rvice may be obtaine d by contacting a D -L ink office withi n the applicable warranty period for a
Return Mate rial Authorization (RMA) number. If a Registrat ion Card has not be e n pre viously sent, proof of
purchase, such as a copy of the da ted purchase invoice, must be provided. Once an RMA number is issued,
the defecti ve product must be shipped back to D-Link pre pa id, insured and w r a ppe d in the original or similar
shipping package to ensure that it will not be damaged during shipment. When returning the defective prod­uct to D-Link for service, t he RMA number must be marked on the outside of the shipping package. Any
product returned wi thout an RMA number shall be reje c ted and sent bac k to the Customer, and D-Link re­serves the right to have C ustomer bear the c ost of sending bac k such products. A service cha rge may or may
not be levie d to Customer by D - Link. To find out if a service cha r ge is levied or not, and the char ge d amount,
read the RMA that is returned to Customer, or ask the D-Link office when an RMA is requested.

Period

D-Link Offices to Contact for Warranty Service:

To obtain an RM A number for warranty se rvice, contact the D-Link offic e nearest you. There is a li st of
contact addresses for D-Li nk’s internationa l offices in the ba c k of this User’s Guide. Your W a rra nty Regis­tration C a rd should also be sent to your regional D-Link office.

iii

WARRANTIES EXCLUSIVE

IF THE D-LINK PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, THE CUSTOMER'S
SOLE REMEDY SHALL BE, AT D-LINK'S OPTION, REPAIR OR REPLACEMENT. THE FOREGOING
WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSED OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW,
STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. D-LINK NEITHER ASSUMES NOR AUTHORIZES ANY OTHER
PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN 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 EXIS T 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 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 ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
IF YOU PURCHASED A D-LINK PRODUCT IN THE UNITED STATES, SOME STATES DO NOT
ALLOW THE LIMITATION OR EXCLUSION OF LIABILITY FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

iv

Trademarks

Copyright 1997 D-Link Corporation.
Contents subject to change without prior notice.
D-Link is a registered trademark of D-Link Corporation/D-Link Systems,
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 adap­tation without permission from D-Link Corporation/D-Link Systems Inc., as
stipulated by the United States Copyright Act of 1976.

FCC Warning

This equipment has been tested and found to comply with the regulations
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 user’s guide, may cause
harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference, in which case
the user will be required to correct the interference at his own expense.

CE Mark Warning

This is a Class A product. In a domestic environment, this product may
cause radio interference, in which case the user may be required to take
adequate measures.

VCCI A Warning

v

ABLE OF

T

ONTENTS

C

0 A

BOUT THIS GUIDE

Conventions........................................................................................viii

Overview of the User’s Guide............................................................. viii

1 I

NTRODUCTION

Product Description ..............................................................................1

Product Features................................................................................... 2

Dual-Speed Ethernet Hub Technology Overview...................................3

100BASE-TX Technology Overview.......................................................5

100Mbps Fast Ethernet Introduct i on.............................................................. 5

Cables and Connectors..................................................................................6

Topology.......................................................................................................6

Network Diameter......................................................................................... 7

Hub Types..................................................................................................... 7

2 U

NPACKING AND SETUP

Unpacking.............................................................................................9

Identifying External Components......................................................... 10

Front Panel.................................................................................................. 10

Rear Panel................................................................................................... 11

Installing the Hub................................................................................12

Installation.................................................................................................. 12

Rack Mounting............................................................................................ 13

Connecting the Power Supply..............................................................14

.........................................................

.................................................................1

....................................................9

VIII

vi

Dual-Speed Stackable Hubs User’s Guide

3 U

NDERSTANDING INDICATORS

Hub State Indicators............................................................................16

Module Indicato rs (SLOT) ...................................................................17

Port State Indicators............................................................................17

Port Speed Indicators..........................................................................18

4 M

AKING CONNECTIONS

Hub Cascading/Building a Stack .........................................................19

Connectivity Rules...............................................................................20

Hub to End-Station Connection...........................................................21

Hub-to-Hub Uplink..............................................................................23

Optional Module Connections.............................................................24

Module Installati on ..................................................................................... 24

Switching Module (DFE-260S) ................................................................... 25

Fiber Optic Module (DFE-260FX) ............................................................... 26

Fast Ethernet Module (DFE-260TX)............................................................ 27

5 C

ABLES AND CONNECTORS

100BASE-TX Ethernet Cable and Connectors......................................29

...................................................19

.........................................15

............................................29

Crossover Cables.................................................................................30

6 S

PECIFICATIONS

General ...............................................................................................33

Hub-to-Hub Cascading ........................................................................34

LED Indicators....................................................................................34

Environmental and Physical ................................................................34

.............................................................33

vii

0 A

This guide discusses how to install and use the D-Link DFE-916 series
dual-speed stackable Ethernet/Fast Ethernet hubs.

BOUT THIS

UIDE

G

Conventions

As used in this manual, the e xpression "DFE-916 series" includes both t he
DFE-916 and the DFE-916x. Unless a specific model number is given, the
term "hub" (or "hubs") refers to any unit (or unit s) in t his serie s.

Most of the information in this manual applies to all DFE-916 and DFE­916x units. Where a description applies to one model only, the specific
model number will be given.

Overview of the User’s Guide

Chapter 1,

♦

works, and introduces the features of the DFE-916 series hubs.
Chapter 2,

♦

the hub.
Chapter 3,

♦

on the hub’s front panel. Understanding these indicators is essential
to effectively using the hub.

Introduction

Unpacking and Setup

Understanding Indicators

. Provides information on Fast Ethernet net-

. Helps you get started in setting up

. Describes all LED indicators

About this Guideviii

Dual-Speed Stackable Hubs User’s Guide

Chapter 4,

♦

Making Connections

. Provides information on connect­ing to the hub’s twisted-pair and console ports, stacking hubs, and
linking with other hubs.

Appendix A,

♦

Cables and Connectors

. Provides specifications on the

cables and connectors used with t he hubs.
Appendix B,

♦

Specifications

. Lists the hubs’ specifications.

About this Guide ix

Dual-Speed Stackable Hubs User’s Guide

1

1 I

This chapter introduces DFE-916 series dual-speed stackable hubs, as well
as giving some background information about the technology the hubs use.

NTRODUCTION

Product Description

D-Link DFE-916 series dual-speed stackable Ethernet/Fast Ethernet hubs
are designed to allow easy migration and integration between 10Mbps
Ethernet and 100Mbps Fast Ethernet, while providing manageability and
flexibility in cable connections.

Each hub can operate with both IEEE 802.3 10BASE-T connections
(twisted-pair Ethernet operating at 10 megabits per second) and IEEE

802.3u 100BASE-TX connections (twisted-pair Fast Ethernet operating at
100 megabits per second). All of the twisted-pair ports support NWay
auto-negotiation, allowing the hub to automatically detect the speed of a
network connection. This means you can connect all of your Ethernet and
Fast Ethernet hosts to a DFE-916 series hub stack, without any rewiring
required when a host is upgraded from 10Mbps to 100Mbps.

DFE-916 series hubs have 16 ports each and can be stacked together toa
maximum of five hubs in a stack. A stack of five 16-port hubs gives a total
of 80 Ethernet or Fast Ethernet ports. A DFE-916 series hub stack operates
as a Class II Fast Ethernet repeater, allowing it to be linked to another Class
II Fast Ethernet stack in the same collision domain.

Introduction 1

In the basic configuration, 10Mbps and 100Mbps segments are separate and
do not intercommunicate. An optional DFE-260S switching module (in­cluded with the DFE-916x) can be installed in any hub in the stack, making
it possible to transparentl y bri dge be t ween 10Mbps a nd 100Mbps segments.
In a managed hub stack, more than one DFE-260S module can be used to
provide automatic redundancy.

Other add-in modules are also available, providing switched 100BASE-TX
or switched 100BASE-FX connections. DFE-916x and DFE-916 hubs have
one slot each for accepting slide-in modules.

Product Features

The list below highlights the features and specifications of DFE-916 series
hubs:

♦ Compatible with the IEEE 802.3 10BASE-T Ethernet 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 hub, and a total network diameter of 205
meters.

♦ Sixteen NWay ports per hub for connecting stations to the network.
♦ An optional slide-in switching module allows bridging between

10Mbps and 100Mbps segments. Only one switching module is
needed per stack, but managed hub stacks can make use of addi­tional switching modules for redundancy.

Introduction2

Dual-Speed Stackable Hubs User’s Guide

♦ A stack can contain various DFE-916 series models and DFE-2624

and DFE-2616 series models. For SNMP management, DFE-916
and DFE-916x units can be managed through a DFE-2616i/DFE­2616ix or DFE-2624i/DFE-2624ix master hub.

♦ LED indicators for power, collisions, link, network activity, parti-

tioning status, disable, operating speed (10 or 100Mbps) and
network utilization.

♦ Digital hub ID number front panel display.
♦ Auto-partitioning for network protection.
♦ Data collision detection and handling.
♦ Preamble regeneration, signal retiming.

♦ Two proprietary daisy-chain ports for cascading up to five hubs to

form one logical hub; management capability is provided via a
master hub.

♦ Uplink port allows easy linking of two hub stacks to further expand

your network.

♦ Optional brackets for mounting in sta nda rd 19-inc h e quipm e nt ra c k.
♦ Internal universal power supply and automatic voltage selection

(100V to 240V, 50 or 60HZ).

♦ Optional slide-in modules: 100BASE-TX, 100BASE-FX (see

Chapter 4 , Making Connections).

Dual-Speed Ethernet Hub
Technology Overview

Dual-speed Ethernet hubs have been developed to make it simpler t o plan
networks containing both 10Mbps Ethernet and 100Mbps Fast Ethernet

Introduction 3

technologies, especially when network hosts are being gradually migrated
to new Fast Ethernet connections.

A dual-speed hub is actually two repeaters in one enclosure. The 10Mbps
repeater receives Ethernet transmissions from any of its ports, and retrans­mits them to all other ports operating at 10Mbps. Similarly, the 100Mbps
repeater retransmits Fast Ethernet transmissions from ports operating at
100Mbps to all other ports operating at the same speed.

10Mbps Repeater

100Mbps Repeater

NWay Dete ctio n

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps
Ethernet

Station

100Mbps
Ethernet

Station

If there is a DFE-260S module, or a DFE-916x hub present in the stack, the
switching module will serve as a bridge between the two independent re­peaters.

Introduction4

DFE-260s

Switch
Module

Dual-Speed Stackable Hubs User’s Guide

10Mbps Repeater

100Mbps Repeater

NWay Dete ctio n

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps
Ethernet

Station

100Mbps

Ethernet

Station

100BASE-TX Technology Overview

100Mbps Fast Ethernet Introduction

Computers today have become increasingly powerful, with the capability to
accommodate very sophisticated uses such as multimedia applications,
video-conferencing, and CAD/CAM. To utilize these technologically ad­vanced applications more efficiently, there is also a growing demand for
faster networks that can handl e hea vy ne twork tra ffi c.

Recognizing this need for greater bandwidth and lower latency, a variety of
technologies suc h as FDDI, ATM, a nd Fast Ethe rnet (100Mbps) ha ve been
adopted by many vendors. Fast Ethernet technology stands out as the most
inexpensive and smoothest migration path for existing 10Mbps Ethernet
users in part because it doesn’t 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

Introduction 5

CSMA/CD Ethernet protocol. Since Fast Ethe rnet is compatible with all
10Mbps Ethernet environments, it provides a stra ightforward upgrade with­out wasting the company’s existing investment in hardware, software, and
trained personnel.

Cables and Connectors

Category 5 unshielded twisted-pair (UTP) cables and shielded twisted-pair
(STP) cables are both supported. Category 5 UTP cables use the same RJ­45 connector used with 10BASE-T, wired in the same configuration.

Topology

A Fast Ethernet workgroup is configured in a star topology and is built
around a maximum of two repeaters. Each workgroup forms a separate
LAN (also known as a collision domain), and these workgroups can be eas­ily interconnected through switches, bridges, or routers to form one LAN
large enough to encompass a high-rise building or campus environment.
Recent innovations in LAN hub technology such as stackable hubs, coupled
with the decreasing cost of switches, bridges, and routers, allow the design
of low-cost, efficient Fast Ethernet workgroups and enterprise LANs.

The following factors strongly influence the architecture 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).

Introduction6

Dual-Speed Stackable Hubs User’s Guide

Network Diameter

Network diameter, which is the distance between two end-stations in the
same collision domain, is the primary difference between traditional
Ethernet and Fast Ethernet. Due to the increased speed in Fast Ethernet
and adherence to the EIA/TIA 568 wiring rules, the network diameter of a
Fast Ethernet collision domain is limited to 205 meters; in contrast, the
maximum 10BASE-T Ethernet collision domain diameter can be up to 500
meters.

Hub Types

Unlike 10BASE-T hubs, which are all functionally identical, Fast Ethernet
hubs are divided into two distinc t types: Class I and Class II. A Class I
hub repeats all incoming signals on one port to the other ports by first
translating them to digital signals and then retranslating them back to line
signals. These translations are necessary when connecting various network
media to the same collision domain, such as when combining two-wire-pair
100BASE-TX media with four-wire-pair 100BASE-T4 media. Only one
Class I hub can exist within a 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 within the same collision domain.

As mentioned earlier, stackable Class II hubs can be used to increase the
number of available nodes in a collision domain. An entire hub stack
counts as a single repeater. DFE-916 series hubs are Class II devices.

Introduction 7

Dual-Speed Stackable Hubs User’s Guide

2

2 U

This chapter provides information on the unpacking and initial installation
of your hub stack.

NPACKING AND

ETUP

S

Unpacking

Open the shipping carton of your hub and carefully unpack the contents.
The carton should contain the following items:

♦ One dual-speed stackable hub
♦ One AC power cord, suitable for your area’s electrical power con-

nections

♦ One daisy-chain cable
♦ Four rubber feet to be used for cushioning
♦ This User’s Guid e

Inspect the hub and all accompanying items. If any item is damaged or
missing, report the problem immediately to your D-Link dealer.

Unpacking and Setup 9

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

♦ LED Indicator Panel
Refer to the next chapter, Understanding Indicators, for detailed infor-

mation about each of the hub’s LED indicators.

♦ Twisted-Pair Ports
Use any of these ports to connect stations to the hub. The ports are

MDI-X ports, which means you can use ordinary straight-through
twisted-pair cables to connect the hub to PCs, workstations, or servers
through these ports. If you need to connect 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).

Unpacking and Setup10

Dual-Speed Stackable Hubs User’s Guide

For more information about crossover connection, see the section enti­tled Crossover Cables section on page 30.

♦ Uplink Port
The Uplink port is an MDI-II port, which means you can connect the

hub (or hub stack) to another device with MDI-X ports using an ordi­nary straight-through cable, making a crossover cable unnecessary.

Port 1 and the Uplink port are really the same port, except that their

pinouts are different. Do not use both P ort 1 and the Uplink port at

the same time.

Rear Panel

♦ Module Slots
Used to install module options for various kinds of additional connec-

tions, as well as the DFE-260S 10Mbps/100Mbps bridge module. (In
the DFE-916x, the module slot is already occupied by the switching
module which is standard on these models.)

♦ Daisy -Cha i n IN Port
When cascading a set of D-Link’s stackable dual-speed hubs, this port

should be connected to the Daisy-Chain OUT port of the previous hub
in the stack (usually placed immediately above it). A cascade of five

Unpacking and Setup 11

hubs can be created in this way. The 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.

♦ AC Power Connect o r
For the power cord.

Installing the Hub

Installation

The site where you install the hub stack may greatly affect its performance.
When installing, consider the following pointers:

♦ Install the hub stack in a fairly cool and dry place. See Appendix B,

Specifications, for the acceptable temperature and humidity operat­ing ranges.

♦ Install the hub stack in a site free from strong electromagnetic field

generators (such as motors), vibration, dust, and direct exposure to
sunlight.

Unpacking and Setup12

Dual-Speed Stackable Hubs User’s Guide

♦ 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 bottom of each device. The rubber feet cushion the hub
and protect the hub case from scratches.

Rack Mounting

The hub can be mounted in an EIA standard-size, 19-inch rack, which can
be placed in a wiring closet with other equipment. For information about
D-Link’s DFE-700B Rack Mounting Brackets, consult your D-Link dealer.
If you already possess the brackets, attach the mounting brackets at the
hub’s front panel (one on each side), and secure them with the provided
screws.

Then, use screws provided with the equipment rack to mount each hub in
the rack.

Unpacking and Setup 13

Connecting the Power Supply

Power is supplied to the stackable Fast Ethernet hub through an AC power
cord. The AC power input voltage ranges from 100 to 240 VAC. A power
cord is included with the device.

Unpacking and Setup14

Dual-Speed Stackable Hubs User’s Guide

3

3 U

Before connecting network devices to the hub, take a few minutes to look
over this section and familiarize yourself with the front panel LED indica­tors of your dual-speed hub, depicted below.

NDERSTANDING

NDICATORS

I

Understanding Indicators 15

Hub State Indicators

♦ Power Indicator
This indicator lights green when the hub is receiving power; otherwise,

it is off.

♦ Collision Indicators (COL10M and COL100M)
These indicators indicate data collisions on the respective 10Mbps

Ethernet or 100Mbps Fast Ethernet segments of the hub. (If several
hubs are stacked or linked together, all of them should detect and indi­cate the same collision, since collisions span the entire network
segment.) Whenever a collision is detected, the respective COL indi­cator will briefly blink amber.

♦ Segment Utilization % (10M Utilization % and 100M Utilization

%)

The utilization bar graphs provide 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 band­width in use on the respective network segment. All data packets are
counted, whether valid or not.

♦ HUB ID Indicator
The HUB ID readout shows the ID (group) number of the hub within

the hub stack. The hub’s ID is automatically set when the hub is placed
in a hub stack and powered on. In an unmanaged stack (all slave mod­els), all IDs will read “0.” In a stack with a master (intelligent) model,
the master hub will detect the other hubs in the stack and automatically
assign ID numbers.

Understanding Indicators16

Dual-Speed Stackable Hubs User’s Guide

Module Indicators (SLOT)

The module indicator indicates a good link to a module installed in the re­spective slot. For the DFE-260S switching module, the indicator will come
on when the module is installed. For the DFE-260FX and DFE-260TX
modules, the slot link indicator should light whenever the module is in­stalled and there is a valid link.

Note: DFE-916x/DFE-916 can be stacked with DFE-2600 series products
and can be managed through a DFE-2616i/DFE-2616ix or DFE­2624i/DFE-2624ix master hub.

Port State Indicators

There is one port state indicator for each of the twisted-pair ports on the
hub. Each port’s LED status indicator reports the port’s link and activity
status, and shows whether or not the port has been partitioned.

The following describes each indicator and the meaning of each condition:

♦ Link (green)
The indicator of a port lights green when the port is connected to a

powered Ethernet or Fast Ethernet station. If the station to which the
hub is connected is powered off, or if there is a problem with the link,
the LED will remain off.

♦ Receive (blinking green)
When information is received on a port, its indicator will blink off

briefly. Upon reception, the data will be transmitted to all other con­nected ports.

Understanding Indicators 17

♦ Auto-partition (blinking amber)
The indicator of a port blinks amber when the port is automatically par-

titioned due to an abnormal network condition.

The hub will temporarily partition a port when too many line errors or

too many collisions are detected on the port. While the segment is
automatically 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.

♦ Disabled (steady amber)
The indicator of a port is amber when the port has been manually dis-

abled. No packet transmission or reception can occur on the port. Ports
can be manually disabled and enabled from the management station if a
stack is being managed via a DFE-2616i/DFE-2616ix or DFE­2624i/DFE-2624ix master hub.

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 de­vice is connected to the port, and remain dark if the port is unconnected or
if a 10BASE-T device is connected.

Understanding Indicators18

Dual-Speed Stackable Hubs User’s Guide

4

4 M

ONNECTIONS

C

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).

AKING

Hub Cascading/Building a Stack

You can stack up to five hubs using the daisy-chain ports to form one logi­cal hub. In this configuration, the interconnected hubs constitute a single
logical unit, providing a maximum of 80 twisted-pair ports.

Use the provided daisy-chain cable to connect the Daisy-Chain OUT port
on the rear panel of one hub t o 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.

Making Connections 19

Hubs should not be added to 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 r e movi ng hubs.

Connectivity Rules

Ethernet (10Mbps) networks have the following connectivity rules:
♦ The maximum length of a twisted-pair cable segment is 100 meters.

Cabling should be Category 3 or better.

♦ Between any two end-stations in a collision domain, there may be up

to five cable segments and four intermediate repeaters (hubs, hub
stacks, or other repeaters).

♦ If there is a path between any two end-stations containing five seg-

ments and four repeaters, then at least two of the cable segments
must be point-to-point link segment s (e.g., 10BASE-T or 10BASE-

Making Connections20

Dual-Speed Stackable Hubs User’s Guide

FL), while the remaining segments may be populated (mixing) seg­ments (e.g., 10BASE-2 or 10BASE-5).

Fast Ethernet (100Mbps) networks have the following connectivity 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 UTP or shielded twisted­pair (STP).

♦ The maximum diameter in a collision domain is approximately 205

meters using two Class II hubs (or hub stacks).

♦ Between any two end-stations in a collision domain, there may be up

to three cable segments and two Class II hubs or hub stacks.

Hub to End-Station Connection

After installing the hub properly, it can support up to sixteen (DFE­916x/DFE-916) end-station connections. Fast Ethernet connections require
either a Category 5 UTP cable or an STP cable. These cables can be up to
100 meters long.

Each Ethernet connection requires a Category 3 or better UTP cable. It is
recommended that you use Category 5 cabling for all connections, in order
to make it easier to transition all stations to 100Mbps.

You can connect any combination of PCs, servers, and other single-address
network devices to the twisted-pair ports using straight-through twisted-pair
cables. These cables should not be crossed over. T he following figure il­lustrates the pin assignments for a straight-through cable:

Making Connections 21

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 following figure shows typical connections between the hub and end­stations:

Making Connections22

Dual-Speed Stackable Hubs User’s Guide

Hub-to-Hub Uplink

You can link two hubs or hub stacks to each other using any of the twisted­pair ports or the Uplink port. Linking hubs using ordinary twisted-pair
ports requires crossover twisted-pair cables; linking using one ordinary
twisted-pair port and the Uplink port requires an ordinary straight -through
twisted-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 hub­to-hub connection is limited to 5 meters. However, if the longest hub-to­end-station connection is less than 100 meters, then the hub-to-hub connec­tion can be up to 100 meters long as long as the 205-meter total network
diameter rule is followed.

The following table describes different methods of linking hubs (or hub
stacks):

HUB PORT
USED

Normal Switch or

Uplink Switch or

Making Connections 23

DEVICE PORT

TYPE

Non-

Hub

Serv er ( or P C) Straight - Through (||)

Hub

Server (or PC) Crossover (X)

Uplink
Uplink

Non­Uplink

Uplink

CABLE TO USE

Crossover (X)

Straight - Through (||)

Straight - Through (||)

Crossover (X)

A crossover cable is a straight-through twisted-pair cable in which the
wires have been crossed. The fi gure 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 Uplink port, then do not us e Por t 1.

Optional Module Connections

There are three opt ional m odules that m ay be adde d to any of the DFE-916
series hubs. Each hub can accommodate one module. Each of the modules
offers a different additional network interface that allows for greater flexi­bility in how these hubs may be used in a network.

The sections that follow provide a brief overview of the module and basic
instructions on various settings and indicators.

Module Installation

The installation procedure for each module is the same. Additional infor­mation about each module is provided below.

To install any of the modules:

Making Connections24

Dual-Speed Stackable Hubs User’s Guide

1. Locate the module slot in the hub’s rear panel.

2. Using a screwdriver, undo the two screws and remove the dust cover

on the module slot.

3. Holding the module component-side up and connector-side in, gently

slide the module along the guides and seat it in the internal connector.

4. Using a screwdriver, replace the two screws and tighten until snug.

We recommend that you retain the dust cover in case you need to remove
the module for an extended period sometime in the future.

Switching Module (DFE-260S)

The DFE-260S switching module is used to allow interconnection between
the 10Mbps and 100Mbps segments in the hub or hub stack. Each hub
stack should have one DFE-260S module (such as the one included in the
DFE-916x) if you wish to allow 10Mbps and 100Mbps stations to inter­communicate.

Making Connections 25

Fiber Optic Module (DFE-260FX)

A fiber optic module provides a standard Fast Ethernet 100BASE-FX fiber
optic connector. A fiber optic connection is particularly useful for creating
a link between two DFE-916 series hub stacks, placing them in separate
collision domains. A link of this sort eliminates the need for a separate
switch to separate stacks into separate domains. Separating the stacks into
separate collision domains overcomes the Fast Ethernet two-repeater limi­tation, and effectively doubles overall bandwidth.

The fiber optic module includes the following LED indicators:

• Power/Tx—This LED is lit when the hub is on and blinks when pack-

ets are being transmitted by the module.

• Link/Rx—This LED is lit when the fiber optic ports are properly con-

nected to a powered-on device and blinks when packets are being
received by the module.

• Collision—This LED blinks when there are packet collisions on the

fiber optic link.

• FDX—This LED is lit when the fiber optic port is set for full duplex

transmit and receive. When the LED is off, the fiber optic port is in
half duplex mode.

The duplex mode DIP switch allows you to set the fiber optic link to full
duplex mode operation. Only the right-hand switch (number 2) is active.
Use it to set the duplex mode.

Making Connections26

Dual-Speed Stackable Hubs User’s Guide

Fast Ethernet Module (DFE-260TX)

A Fast Ethernet module provides one additional twisted-pair Fast Ethernet
connection. A twisted-pair connection of this kind is particularly useful for
creating a link between two DFE-916 series hub stacks, placing them in
separate collision domains. A link of this sort eliminates the need for a
separate switch to separate stacks into separate domains. Separating the
stacks into separate collision domains overcomes the Fast Ethernet two­repeater limitation, and effectively doubles overall bandwidth.

The recommended use for this module is to connect to another module of
this kind in a second stack.

The Fast Ethernet module uses a MDI-X connector (not a straight MDI-II);
therefore, a crossover cable must be used when connecting the module to
another module (and under m ost ot her c i rcum sta nce s). See Appendi x A for
pinout information.

The Fast Ethernet module includes the following LED indicators:

• Power/Tx—This LED is lit when the hub is on, and blinks when pack-

ets are being transmitted by the module.

• Link/Rx—This LED is lit when the port is properly connected to a

powered-on device, and blinks when packets are being received by the
module.

Making Connections 27

• Collision—This LED blinks when there are packet collisions on the

module link.

• FDX—This LED is lit when the port is set for full duplex transmit and

receive. When the LED is off, the port is in half duplex mode.

The duplex mode DIP switch allows you to set the port to full duplex mode
operation. Only the right-hand switch (number 2) is active. Use the DIP
switch to set the duplex mode.

Making Connections28

Dual-Speed Stackable Hubs User’s Guide

A

5 C

C

ABLES AND

ONNECTORS

100BASE-TX Ethernet Cable and
Connectors

♦ Cable characteristics: Category 5 unshielded twisted-pair or

EIA/TIA-568 compliant, 100-ohm shielded twisted-pair data cable
with 0.4 to 0.6 mm (22 to 26 AWG) wires in two or four twisted
pairs (only two pairs/four wires are used for 100BASE-TX).

♦ Maximum segment length: 100 meters
♦ Maximum network diameter: 205 meters
♦ Connectors: RJ-45

Cables and Connectors 29

Dual-Speed Stackable Hubs User’s Guide

Straight Twisted-Pair Cabl e Pi nout s

Contact MDI- X Si gna l MDI-II Signal

1 RD+ (receive) TD+ (transmit)
2 RD- (receive) TD- (transmit)
3 TD+ (transmit) RD+ (receive)
4 Not used Not used
5 Not used Not used
6 TD- (transmit) RD- (receive)
7 Not used Not used
8 Not used Not used

Crossover Cables

When cascading or connecting the hub to another hub, or to a switch or
bridge, through a 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:

Leave one end of the cable as is, with the RJ-45 connector intact.

1.

The wiring at just one end of the cable needs to be modified.

Cables and Connectors 30

Dual-Speed Stackable Hubs User’s Guide

At the other end of the cable, connect wires 1 and 2 to contacts 3

2.

and 6, respectively. Likewise, connect wires 3 and 6 to contacts 1
and 2. Refer to the fol lowing di a gram :

Cables and Connectors 31

Dual-Speed Stackable Hubs User’s Guide

B

6 S

PECIFICATIONS

General

Standards: IEEE 802.3 10BASE-T Ethernet repeater, IEEE 802.3u

100BASE-TX Fast Ethernet repeater (Class II); ANSI
X3T9.5 Twisted-Pair Transceiver

Topology: Star
Protocol: CSMA/ C D
Network Data Transfer Rate: Fast Ethernet, 100Mbps; Ethernet,

10Mbps

Number of Ports: 16, all dual-speed (10Mbps/100Mbps)
Network Media: Ethernet: Category 3 or better UTP cable, 100m maxi-

mum; Fast Ethernet: Cat 5 UTP/STP, 100-ohm
twisted-pair (100m maximum) for hub-to-station links;
Cat 5 UTP, 100-ohm UTP/STP (5m maximum) for
hub-to-hub linking

Specifications 33

Hub-to-Hub Cascading

Number of Daisy-Chained Hubs: Maximum of 5 hubs per stack
Daisy-Chain Port: MiniSCSI-type connector × 2
Daisy-Chain Ca bl e: SCSI-type cable (supplied)

LED Indicators

Hub Status: Power, 10Mbps collision, 100Mbps collision, 10Mbps utili-

zation, 100Mbps utilization, module link

Port Status (per port): Link/Activity/Auto Partition/Manual Disable,

Speed (10/100Mbps)

Environmental and Physical

Power Suppl y : 100 t o 240 VAC, 50 or 60 Hz int e rnal uni versal

power supply

Power Consum pt i o n: DFE-916x = 28 watts maximum

DFE-916 = 28 watts maximum

Dimensions: 324m m (W ) × 55m m (H) × 231 mm (D)

(12.75 × 216 × 9.09 inches)

Weight: 2.5 kg (5.5 lb.) (1.25U height)
Operating Temperature: -10 to 55°C

Specifications34

Dual-Speed Stackable Hubs User’s Guide

Storage Temperature: -25 to 55°C
Humidity: 5% to 95% non-condensing
DC Fan: 40mm × 40mm × 10mm
Emissions: FCC Class A, CE, VCCI Class A, C-Tick
Safety: UL, CSA, CE Mark, TÜV/GS

Specifications 35

Offices

U.S.A. D-LINK SYSTEMS, INC.

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GERMANY D-LINK (DEUTSCHLAND) GMBH I.G.

FRANCE D-LINK FRANCE

SWEDEN D-LINK A/B

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TEL: [phone] FAX: [phone]

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TEL: [phone] FAX: [phone]

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Registration Card

Print, type or use block letters.

Your name: Mr./Ms_____________________________________________________________________________
Organization: ________________________________________________Dept. ____________________________
Your title at organization:________________________________________________________________________
Telephone:_______________________________________ Fax:________________________________________
Organization's full address: ______________________________________________________________________

____________________________________________________________________________________________
Country: _____________________________________________________________________________________
Date of purchase (Month/Day/Year):_______________________________________________________________

3URGXFW 0RGHO 3URGXFW 6HULDO

(* Applies to adapters only)

Product was purchased from:

Reseller's name: ______________________________________________________________________________
Telephone:_______________________________________ Fax:________________________________________
Reseller's full address: _________________________________________________________________________

1R1

_________________________________________________________________________
_________________________________________________________________________

Answers to the following que stions help us to support 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 ?

D-Link LANsmart †Novell NetWare †NetWare Lite †SCO Unix/Xenix †PC NFS †3Com 3+Open

†

Banyan Vines †DECnet Pathwork †Windows NT †Windows NTAS †Windows '95

†

Other__________________________________________

†

5. What network management program does your organization use ?

D-View †HP OpenView/Windows †HP OpenView/Unix †SunNet Manager †Novell NMS

†

NetView 6000 †Other________________________________________

†

6. What network medium/media does your organization use ?

Fiber-optics †Thick coax Ethernet †Thin coax Ethernet †10BASE-T UTP/STP

†

100BASE-TX †100BASE-T4 †100VGAnyLAN †Other_________________

†

7. What applications are used on your network?

Desktop publishing †Spreadsheet †Word processing †CAD/CAM

†

Database management †Accounting †Other_____________________

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8. What category best describes your company?

Aerospace †Engineering †Education †Finance †Hospital †Legal †Insurance/Real Estate †Manufacturing

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Retail/Chainstore/Wholesale †Government †Transportation/Utilities/Communication †VAR

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9. Would you recommend your D-Link product to a friend?

Yes †No †Don't know yet

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10.Your comments on this product?

__________________________________________________________________________________________
__________________________________________________________________________________________

- 3URGXFW LQVWDOOHG LQ W\SH RI
FRPSXWHU +H1J1/ &RPSDT 7;9,

- 3URGXFW LQVWDOOHG LQ

FRPSXWHU VHULDO 1R1