D-Link DES-815 User manual

DES-815
10/100 Fast Ethernet Switch
User’s Guide
Rev. 02 (Aug., 1997)
6DES815...02
Printed In Taiwan
RECYCLABLE

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.

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.

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
Managed Switch Three Years*
Unmanaged Switch Lifetime*
*Power supply and fans in these devices One year
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 warranty 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 contained 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 product 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
reserves 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 mail your Registration Card, or to obtain an RMA number or a warranty service, see the
following addresses:
In North, Central and South America:
D-Link Systems Inc.
5 Musick, Irvine CA 92618
Tel. [phone] Fax. [phone]
In Europe and Israel
D-Link Europe
D-Link House, 6 Garland Road, Stanmore, London HA7 1DP, U.K.
Tel. [phone] Fax. [phone]
In the Middle East (except Israel), Asia, Oceania and Africa:
D-Link Corporation
No. 233-2, 2nd F. Pao Chiao Road, Hsin Tien Taipei, Taiwan
Tel. [phone] Fax. [phone]

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
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 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.

10/100 Fast Ethernet Switch User’s Guide
Preface vii
TABLE OF CONTENTS
PREFACE .........................................................................ix
Purpose.......................................................................................ix
Audience.....................................................................................ix
Manual Organization..................................................................x
1 OVERVIEW.......................................................................1
Introduction ................................................................................1
100Mbps Fast Ethernet Introduction..........................................2
100BASE-TX Technology Overview............................................3
Cables and Connectors.......................................................................3
Topology.............................................................................................3
Network .............................................................................................4
Hubs...................................................................................................4
Connectivity Rules.............................................................................5
Switching Technology.................................................................5
Benefits of Switching.........................................................................6
10/100 Switching Technology.............................................................6
Product Features.........................................................................7
Packing List ................................................................................8
Front Panel..................................................................................8
Ports...................................................................................................8
LED Indicators.................................................................................11
Rear Panel.................................................................................13
Duplex Mode Switch........................................................................14

viii Preface
2 INSTALLATION ................................................................15
Installation Site ........................................................................15
Installing on a Desktop or Shelf ...............................................16
Installing in a Rack ..................................................................17
Connecting Power......................................................................18
Network Connections.................................................................18
10/100Mbps Ports ............................................................................18
10Mbps Ports...................................................................................19
Cable Types......................................................................................19
Setting the Duplex Mode...........................................................20
Network Configuration Examples.............................................21
Fast Ethernet Server Connection ....................................................22
LAN Microsegmentation..................................................................23
A SPECIFICATIONS ............................................................25
B CONNECTOR PINOUTS....................................................27
RJ-45 Connectors......................................................................27
AUI Transceiver Connector.......................................................28
MII Transceiver Connector .......................................................29
1

10/100 Fast Ethernet Switch User’s Guide
Preface ix
PREFACE
Congratulations on your purchase of the 10/100 Fast Ethernet
Switch. This device integrates 100Mbps Fast Ethernet and
10Mbps Ethernet network capabilities in a highly flexible rack
mountable package.
Purpose
This manual discusses how to install and use the 10/100 Fast
Ethernet Switch.
Audience
This manual is intended for network administrators with:
•Background in LAN bridge concepts.
•Understanding of IEEE 802.3 Ethernet and 100BASE-TX Fast
Ethernet networking concepts.
•Understanding of how to install local area networks (LANs).

xPreface
Manual Organization
Chapter 1 Overview
Describes the product, its features, packing list, and the front and
rear panels.
Chapter 2 Installation
Provides detailed instructions on installing the 10/100 Fast
Ethernet Switch. Chapter 2 includes information on table and
rack mounted installation, connecting power, network
connections, setting the communications mode and cascade, and
provides some network configuration examples.
Appendix A Specifications
Lists the technical specifications of the product.
Appendix B Connector Pinouts
Describes the connector pinouts of the 10/100 Fast Ethernet
Switch ports.

10/100 Fast Ethernet Switch User’s Guide
Overview 1
11
2 OVERVIEW
Introduction
The DES-815 Fast Ethernet Switch is ideal for network managers
who want to boost workgroup performance easily by micro-
segmenting a 10Mbps LAN while adding 100Mbps links, or it is
excellently suited to provide a dedicated Fast Ethernet connection
to a key network server or station in an existing 10Mbps network.
The switch integrates 100Mbps Fast Ethernet with 10Mbps
Ethernet networks seamlessly. The speed migration design will
bridge high bandwidth Fast Ethernet network segments to
traditional 10Mbps Ethernet network segments quickly and
simply.
The DES-815 complies with IEEE802.3u, 100BASE-TX,
IEEE802.3 and 10BASE-T standards. It has 12 10Mbps twisted-
pair ports, two 10/100Mbps twisted-pair ports, and one MII port.
The DES-815 provides both store-and-forward and cut-through
passing schemes, automatically selected to provide the best
network performance. Filtering and forwarding rates for the
switch run at wire-speed, reducing latency within and across
segments.

2Overview
The Switch provides an easy, affordable, high-performance,
seamless, and standard-based migration path to a 100BASE-TX
LAN while preserving your initial investment and use of 10Mbps
Ethernet LANs.
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 handle heavy network traffic.
Recognizing this need for greater bandwidth and lower latency, a
variety of technologies such as FDDI, ATM, and 100Mbps Fast
Ethernet have been adopted by many vendors. 100Mbps Fast
Ethernet technology stands out as the most inexpensive and
smoothest migration path for existing 10Mbps Ethernet users.
100Mbps 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 100Mbps Fast Ethernet is compatible with all 10Mbps
Ethernet environments, it provides a straight-forward upgrade
without wasting the company’s existing investment in hardware,
software, and trained personnel.

10/100 Fast Ethernet Switch User’s Guide
Overview 3
100BASE-TX Technology Overview
Cables and Connectors
Category 5 unshielded twisted-pair (UTP) cables are supported.
UTP Category 5 cable uses the same RJ-45 connector used with
10BASE-T, wired in the same configuration. Please note that the
punch-down blocks in the wiring closet must also be Category 5
certified. Where these blocks do not meet the standard, an
upgrade is necessary.
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 segment or 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).

4Overview
•The EIA/TIA 568 Wiring Standard does not support the use
of coaxial cables for horizontal wiring.
Network
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 2500 meters.
Hubs
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 the same collision domain, thus
this type of hub cannot be cascaded. 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 to the same collision domain; for
example, TX to TX. At most, two Class II hubs can exist within
the same collision domain. The cable used to cascade these hubs is
called an inter-repeater link (IRL).
As mentioned earlier, stackable hubs can be used to increase the
number of available nodes in a collision domain. An entire hub
stack counts as a single repeater.

10/100 Fast Ethernet Switch User’s Guide
Overview 5
Connectivity Rules
•The maximum length of a twisted-pair segment (that is,
distance between a port in the hub to a single-address
network device such as a PC, server, or LAN switch) is 100
meters.
•The maximum diameter in a collision domain is about 205
meters using two Class II hubs (hub stacks) and 200 meters
using one Class I hub.
•Between any two end-stations in a collision domain, there
may be up to three segments and two Class II hubs or two
segments and one Class I hub.
Switching Technology
Switching is fast becoming the industry standard for pushing the
limits of existing Ethernet networks. A switch bridges Ethernet
packets between Ethernet and Fast Ethernet LAN segments at
the MAC address level of the Ethernet protocol.
The difference between switched Ethernet (10Mbps, 100Mbps, or
both) and traditional Ethernet is analogous to the difference
between a private phone line and a party line. With switched
Ethernet, each workgroup has a “private line” so that transmitted
packets don’t have to wait as long to gain access to the network.
When connected to a switched port, each Ethernet segment has
full “wire-speed” access, so a switch effectively divides a single
Ethernet LAN into bridged multiple LAN segments. Each
segment can support a workgroup or even provide a dedicated
connection for a key workstation or server. The result of dividing
an Ethernet LAN into multiple segments is a multiplication of
internal bandwidth available to all stations on the LAN and a
reduction in latency rates during peak-use periods.

6Overview
Benefits of Switching
Ethernet switching technology drastically increases the total
bandwidth of a LAN. It also provides configuration flexibility to
local workgroups which allows the network administrator to
better control how network resources are distributed against
network load. Switching helps reduce the congestion problems
inherent in the contention-oriented CSMA/CD protocol, thereby
improving network response during high utilization periods.
Also, currently popular distributed client/server applications often
require higher bandwidth and tighter client-to-server integration.
Legacy 10Mbps Ethernet often is unable to provide a sufficiently
sophisticated platform for users to be able to take full advantage of
such client/server applications.
Fast Ethernet switching not only satisfies both technical and
business needs, it also preserves the current investment in the
huge 10BASE-T Ethernet installed base. Compatibility with
10Mbps Ethernet ensures that users will be able to migrate to
Fast Ethernet at a pace appropriate to their installation and
needs.
10/100 Switching Technology
An integral extension of Fast Ethernet, 10/100 switching provides
not only a 100Mbps high-speed connection for carrying aggregated
10Mbps traffic, it also handles the necessary conversion of MAC
between 10BASE-T and 100BASE-TX. Combining Fast Ethernet
and switching technologies provides both bandwidth for local
workgroups and a high-speed link to carry local traffic elsewhere
in the network.

10/100 Fast Ethernet Switch User’s Guide
Overview 7
Product Features
The 10/100 Fast Ethernet Switch has the following key features:
•Ports: 12 10Mbps, three 10/100Mbps.
•High-speed uplink port for connecting to a higher tier switch
or other device.
•Dynamic buffer allocation to allow network load balance and
prevent packet loss due to congestion.
•Auto polarity correction for all twisted pair ports.
•AUI and MII external transceiver connectors provide
flexibility in choice of network media.
•Full-duplex and half-duplex capability on all ports with each
user-configurable through the Duplex Mode Switch on the
rear panel.
•Flexibility of application: from segmentation of a large LAN to
client-server maximization to dedicated connections for high-
priority single users.
•Support for IEEE 802.3, 10BASE-2, 10BASE-T, IEEE 802.3u
and 100BASE-TX standards.
•Εxtensive LED indicators to facilitate troubleshooting and
monitoring of the product’s operating status.
•Auto-selected fast store-and-forward and fragment-free cut-
through passing schemes provide low latency.
•Compatibility with standard Ethernet applications,
internetworking systems and client-side adapters to minimize
infrastructure changes and costs.

8Overview
Packing List
Unpack the 10/100 Fast Ethernet Switch shipping carton and
check for the listed items below. If any items are missing or
damaged, notify your authorized reseller immediately.
•The 10/100 Fast Ethernet Switch
•This User's Guide
•An AC Power Cord
•Two Rack Mount Brackets and screws
•Four adhesive-backed rubber feet
Front Panel
The 10/100 Fast Ethernet Switch front panel includes network
connectors and LED indicators for ease-of-use.
Figure 1 10/100 Fast Ethernet Switch Front Panel
Ports
The product comes with twisted-pair ports. These ports can be
used to connect to individual stations in need of faster access, to

10/100 Fast Ethernet Switch User’s Guide
Overview 9
segment heavily utilized LANs, and/or to provide higher
bandwidth access to a key server in a client-server environment.
10Mbps Ports
The 10Mbps twisted-pair ports are standard RJ-45 connectors for
use with unshielded or shielded twisted-pair (UTP/STP) wiring.
The 10Mbps ports operate at an user-selectable effective speed of
10Mbps for half-duplex mode or 20Mbps for full-duplex mode. In
either mode, the twisted-pair connector can operate over 100
meters of Category 3, 4, or 5 UTP/STP cable.
Possible uses for the 10Mbps switch ports:
•Segment an existing LAN to improve bandwidth utilization.
•Connect single users either to provide power users with
greater access and thus speed, or multiple users for high
bandwidth access to a shared network server.
•Uplink connections for lower-tier switches.
10/100Mbps Ports
The 10/100Mbps twisted-pair ports are standard RJ-45 connectors
for use with unshielded or shielded twisted-pair (UTP/STP)
wiring. These ports are auto-negotiating between 10Mbps and
100Mbps, which means that they detect the speed of devices
connected to them and auto-configure to run at that speed. The
10/100Mbps ports also operate in half-duplex mode or full-duplex
mode at either speed. In either duplex mode, the twisted-pair
ports can operate over 100 meters of Category 5 UTP or STP cable.
Possible uses for the 10/100Mbps switch ports:

10 Overview
•Add Fast Ethernet segments to an existing 10Mbps LAN.
•Provide a dedicated 100Mbps Ethernet connection for a shared
LAN server in a 10Mbps LAN.
•Uplink to a higher-tier hub or switch.
Table 1-1: Port and Cable Specifications
Port Connector Half/Full
Duplex Cable
10Mbps RJ-45 10/20Mbps 100m,
Category 3,4,
or 5 UTP/STP
10/100Mbps RJ-45 10/20Mbps
100/200 Mbps 100m, Category 5
UTP/STP
Uplink Port
The uplink port is used for higher-tier connections to more
advanced switches or other network devices. Please note that if
you are using the uplink port, you will be unable to use port one
as these two ports are logically linked.
Note: A crossover cable must be used when connecting
from the uplink of another switch or a hub to the
uplink port on the 10/100 Fast Ethernet Switch.