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

ii
Wichtige Sicherheitshinweise
1. Bitte lesen Sie sich diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den spätern Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Vervenden Sie keine Flüssig- oder
Aerosolreiniger. Am besten dient ein angefeuchtetes Tuch zur Reinigung.
4. Um eine Beschädigung des Gerätes zu vermeiden sollten Sie nur Zubehörteile verwenden, die vom
Hersteller zugelassen sind.
5. Das Gerät is vor Feuchtigkeit zu schützen.
6. Bei der Aufstellung des Gerätes ist auf sichern Stand zu achten. Ein Kippen oder Fallen könnte
Verletzungen hervorrufen. Verwenden Sie nur sichere Standorte und beachten Sie die Aufstellhinweise
des Herstellers.
7. Die Belüftungsöffnungen dienen zur Luftzirkulation die das Gerät vor Überhitzung schützt. Sorgen Sie
dafür, daß diese Öffnungen nicht abgedeckt 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 Sie die Netzanschlußleitung so, daß niemand darüber fallen kann. Es sollete auch nichts auf
der Leitung abgestellt werden.
11. Alle Hinweise und Warnungen die sich 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 Gerät darf aus Gründen der elektrischen Sicherheit nur von
authorisiertem Servicepersonal geöffnet werden.
15. Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu trennen und von einer qualifizierten
Servicestelle zu überprüfen:
a– Netzkabel oder Netzstecker sint beschädigt.
b– Flüssigkeit ist in das Gerät eingedrungen.
c– Das Gerät war Feuchtigkeit ausgesetzt.
d– Wenn das Gerät nicht der Bedienungsanleitung ensprechend funktioniert oder Sie mit Hilfe dieser
Anleitung keine Verbesserung erzielen.
e– Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f– Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
16. Bei Reparaturen dürfen nur Orginalersatzteile bzw. den Orginalteilen entsprechende Teile verwendet
werden. Der Einsatz von ungeeigneten Ersatzteilen kann eine weitere Beschädigung hervorrufen.
17. Wenden Sie sich mit allen Fragen die Service und Repartur betreffen an Ihren Servicepartner. Somit
stellen Sie die Betriebssicherheit des Gerätes sicher.

iii
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 Warranty Period
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
Repeaters, MAUs , transceivers, media converters One year
Concentrators One year
Internetworking products One year
* Power supply and fans in these devices One year
Other hardware products One year
Spare parts and spare kits 90 days
If a product does not operate as warranted during the applicable warranty period, D-Link shall, at its option
and expense, (1) repair the defective product or part, (2) deliver to Customer an equivalent product or part to
replace the defective item. All products that are replaced will become the property of D-Link. Replacement
products may be new or reconditioned. Any replaced or repaired product or part has a ninety (90) day war-
ranty or the remainder of the initial warranty period, whichever is longer.
D-Link shall not be responsible for any software, firmware, information, or memory data of Customer con-
tained in, stored on, or integrated with any products returned to D-Link pursuant to any warranty.
All products with lifetime warranty have a standard five-year warranty. To qualify for lifetime warranty, the
enclosed Product Registration 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 defective product must be shipped back to D-Link prepaid, insured and wrapped in the original or similar
shipping package to ensure that it will not be damaged during shipment. When returning the defective prod-
uct to D-Link for service, the RMA number must be marked on the outside of the shipping package. Any
product returned without an RMA number shall be rejected and sent back to the Customer, and D-Link re-
serves the right to have Customer bear the cost of sending back such products. A service charge may or may
not be levied to Customer by D-Link. To find out if a service charge is levied or not, and the charged amount,
read the RMA that is returned to Customer, or ask the D-Link office when an RMA is requested.
D-Link Offices to Contact for Warranty Service:
To obtain an RMA number for warranty service, contact the D-Link office nearest you. There is a list of
contact addresses for D-Link’s international offices in the back of this User’s Guide. Your Warranty Regis-
tration Card should also be sent to your regional D-Link office.

iv
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 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 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.

v
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 adap-
tation 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 inter-
ference 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

vi
T
ABLE OF
C
ONTENTS
0ABOUT THIS GUIDE.........................................................VIII
Conventions........................................................................................viii
Overview of the User’s Guide.............................................................viii
1INTRODUCTION.................................................................1
Product Description ..............................................................................1
Product Features...................................................................................2
Dual-Speed Ethernet Hub Technology Overview...................................3
100BASE-TX Technology Overview.......................................................5
100Mbps Fast Ethernet Introduction..............................................................5
Cables and Connectors ..................................................................................6
Topology.......................................................................................................6
Network Diameter.........................................................................................7
Hub Types.....................................................................................................7
2UNPACKING AND SETUP....................................................9
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

Dual-Speed Stackable Hubs User’s Guide
vii
3UNDERSTANDING INDICATORS.........................................15
Hub State Indicators............................................................................16
Module Indicators (SLOT)...................................................................17
Port State Indicators............................................................................17
Port Speed Indicators..........................................................................18
4MAKING CONNECTIONS...................................................19
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 Installation ..................................................................................... 24
Switching Module (DFE-260S) ................................................................... 25
Fiber Optic Module (DFE-260FX)............................................................... 26
Fast Ethernet Module (DFE-260TX)............................................................ 27
5CABLES AND CONNECTORS ............................................29
100BASE-TX Ethernet Cable and Connectors......................................29
Crossover Cables.................................................................................30
6SPECIFICATIONS.............................................................33
General ...............................................................................................33
Hub-to-Hub Cascading........................................................................34
LED Indicators....................................................................................34
Environmental and Physical................................................................34

About this Guideviii
0 A
BOUT THIS
G
UIDE
This guide discusses how to install and use the D-Link DFE-916 series
dual-speed stackable Ethernet/Fast Ethernet hubs.
Conventions
As used in this manual, the expression "DFE-916 series" includes both the
DFE-916 and the DFE-916x. Unless a specific model number is given, the
term "hub" (or "hubs") refers to any unit (or units) in this series.
Most of the information in this manual applies to all DFE-916 and DFE-
916x units. Where a description applies to one model only, the specific
model number will be given.
Overview of the User’s Guide
♦Chapter 1, Introduction. Provides information on Fast Ethernet net-
works, and introduces the features of the DFE-916 series hubs.
♦Chapter 2, Unpacking and Setup. Helps you get started in setting up
the hub.
♦Chapter 3, Understanding Indicators. Describes all LED indicators
on the hub’s front panel. Understanding these indicators is essential
to effectively using the hub.

Dual-Speed Stackable Hubs User’s Guide
About this Guide ix
♦Chapter 4, Making Connections. Provides information on connect-
ing 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 the hubs.
♦Appendix B, Specifications. Lists the hubs’ specifications.

Dual-Speed Stackable Hubs User’s Guide
Introduction 1
1
1 I
NTRODUCTION
This chapter introduces DFE-916 series dual-speed stackable hubs, as well
as giving some background information about the technology the hubs use.
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.

Introduction2
In the basic configuration, 10Mbps and 100Mbps segments are separate and
do not intercommunicate. An optional DFE-260S switching module (in-
cluded with the DFE-916x) can be installed in any hub in the stack, making
it possible to transparently bridge between 10Mbps and 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 addi-
tional switching modules for redundancy.

Dual-Speed Stackable Hubs User’s Guide
Introduction 3
♦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/DFE-
2616ix 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 standard 19-inch equipment rack.
♦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 to plan
networks containing both 10Mbps Ethernet and 100Mbps Fast Ethernet

Introduction4
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 retrans-
mits 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 Detection
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 re-
peaters.

Dual-Speed Stackable Hubs User’s Guide
Introduction 5
10Mbps Repeater
100Mbps Repeater
NWay Detection
RJ-45 Ports
100Mbps
Ethernet
Station
100Mbps
Ethernet
Station
10Mbps
Ethernet
Station
10Mbps
Ethernet
Station
100Mbps
Ethernet
Station
DFE-260s
Switch
Module
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 ad-
vanced applications more efficiently, there is also a growing demand for
faster networks that can handle heavy network traffic.
Recognizing this need for greater bandwidth and lower latency, a variety of
technologies such as FDDI, ATM, and Fast Ethernet (100Mbps) have 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

Introduction6
CSMA/CD Ethernet protocol. Since Fast Ethernet is compatible with all
10Mbps Ethernet environments, it provides a straightforward upgrade with-
out 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 RJ-
45 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 eas-
ily 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).

Dual-Speed Stackable Hubs User’s Guide
Introduction 7
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 distinct 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 can-
not 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.

Dual-Speed Stackable Hubs User’s Guide
Unpacking and Setup 9
2
2 U
NPACKING AND
S
ETUP
This chapter provides information on the unpacking and initial installation
of your hub stack.
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 Guide
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 Setup10
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).