D-Link DSS-8+ Manuale utente

DSS-8+

8-port 10/100Mbps Switch

User’s Guide

Rev. 03 (MAR. 2001)

6012-9830016

Printed In Taiwan

RECYCLABLE

TABLE OF CONTENTS

ABOUT THIS GUIDE....................................................1

PURPOSE .........................................................................................1

OVERVIEW OF THIS USER’S GUIDE ..........................................1

INTRODUCTION..............................................................2

FAST ETHERNET TECHNOLOGY ................................................2

SWITCHING TECHNOLOGY .........................................................2

FEATURES.......................................................................................4

UNPACKING....................................................................................6

SETUP ..............................................................................................6

IDENTIFYING EXTERNAL

COMPONENTS ....................................................................7

FRONT PANEL.............................................................................7

LED INDICATORS.........................................................................7

REAR PANEL................................................................................8

CONNECTING THE DSS-8+................................10

PC TO DSS-8+ ............................................................................10

HUB TO DSS-8+..........................................................................10

A. 10BASE-T Hub...................................................................11

B. 100BASE-TX Hub .............................................................11

HUB WITHOUT UPLINK (MDI-II) PORT.................................11

A. Using straight cable.............................................................11

B. Using crossover cable .........................................................11

DSS-8+ TO SWITCH (OTHER DEVICES)..................................11

A. Using straight cable.............................................................12

B. Using crossover cable .........................................................12

PORT SPEED & DUPLEX MODE ...............................................12

INSTRUCTIONS FOR USE OF STACKING

BRACKETS............................................................................13

RJ-45 PIN SPECIFICATION................................14

TECHNICAL SPECIFICATIONS....................16

ABOUT THIS GUIDE

Congratulations on your purchase of the DSS-8+. This device

integrates 100Mbps Fast Ethernet and 10Mbps Ethernet network

capabilities in a highly flexible desktop package.

Purpose

The purpose of this manual is to show you how to install and

configure your DSS-8+.

Overview of this User’s Guide

♦Chapter 1, Introduction. Describes the DSS-8+ and its features.

♦Chapter 2, Unpacking and Setup. Helps you get started with the

basic installation of the DSS-8+.

♦Chapter 3, Identifying External Components. Describes the front

panel, rear panel and LED indicators of the DSS-8+.

♦Chapter 4, Connecting the DSS-8+. Tells how you can connect the

DSS-8+ to your Ethernet network.

♦Appendix A, Technical Specifications. Lists the technical (general,

physical and environmental, and performance)

specifications of the DSS-8+.

♦Appendix B, RJ-45 Pin Specification. Describes the RJ-45

receptacle/connector and the straight and crossover

cable connector.

INTRODUCTION

This chapter describes the features of the DSS-8+ and some

background information about Ethernet/Fast Ethernet switching

technology.

Fast Ethernet Technology

The growing importance of LANs and the increasing complexity of

desktop computing applications are fueling the need for high

performance networks. A number of high-speed LAN technologies

have been proposed to provide greater bandwidth and improve

client/server response times. Among them, 100BASE-T (Fast

Ethernet) provides a non-disruptive, smooth evolution from the

current 10BASE-T technology. The non-disruptive and smooth

evolution nature, and the dominating potential market base, virtually

guarantee cost effective and high performance Fast Ethernet solutions

in the years to come.

100Mbps Fast Ethernet is a 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 the 100Mbps

Fast Ethernet is compatible with all other 10Mbps Ethernet

environments, it provides a straightforward upgrade and takes

advantage of the existing investment in hardware, software, and

personnel training.

Switching Technology

Another approach to pushing beyond the limits of Ethernet technology

is the development of switching technology. A switch bridges

Ethernet packets at the MAC address level of the Ethernet protocol

transmitting among connected Ethernet or Fast Ethernet LAN

segments.

Switching is a cost-effective way of increasing the total network

capacity available to users on a local area network. A switch increases

capacity and decreases network loading by dividing a local area

network into different segments, which don’t compete with each other

for network transmission capacity.

The DSS-8+ acts as a high-speed selective bridge between the

individual segments. The DSS-8+, without interfering with any other

segments, automatically forwards traffic that needs to go from one

segment to another. By doing this the total network capacity is

multiplied, while still maintaining the same network cabling and

adapter cards.

For Fast Ethernet networks, a DSS-8+ is an effective way of

eliminating problems of chaining hubs beyond the “two-repeater

limit.” A DSS-8+ can be used to split parts of the network into

different collision domains, making it possible to expand your Fast

Ethernet network beyond the 205-meter network diameter limit for

100BASE-TX networks. DSS-8+s supporting both traditional

10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal for

bridging between the existing 10Mbps networks and the new

100Mbps networks.

Switching LAN technology is a marked improvement over the

previous generation of network bridges, which were characterized by

higher latencies. Routers have also been used to segment local area

networks, but the cost of a router, the setup and maintenance required

make routers relatively impractical. Today switches are an ideal

solution to most kinds of local area network congestion problems.

Features

The DSS-8+ was designed for easy installation and high performance

in an environment where traffic on the network and the number of

users increase continuously.

The DSS-8+ with its small, compact size was specifically designed for

small to middle workgroups. The DSS-8+ can be installed where

space is limited; moreover, the DSS-8+ provides immediate access to

a rapidly growing network through a wide range of functions.

The DSS-8+ is ideal for deployment with multiple high-speed servers

for shared bandwidth 10Mbps or 100Mbps workgroups. With the

highest bandwidth 200Mbps (100Mbps full-duplex mode), any port

can provide workstations with a congestion-free data pipe for

simultaneous access to the server.

The DSS-8+ is expandable by cascading two or more DSS-8+s

together. As all ports support 200Mbps, the DSS-8+ can be cascaded

from any port and to any number of DSS-8+s.

The DSS-8+ is a perfect choice for sites planning to upgrade to Fast

Ethernet in the future. Ethernet workgroups can connect to the DSS-

8+ now, and you can change adapters and hubs anytime later without

needing to change the DSS-8+s or reconfigure the network.

The DSS-8+ combines dynamic memory allocation with store-and-

forward switching to ensure that the buffer is effectively allocated for

each port, while controlling the data flow between the transmit and

receive nodes to guarantee against all possible packet loss.

The DSS-8+ is a managed 10/100 Fast Ethernet switch that offers

solutions in accelerating small Ethernet workgroup bandwidth. Other

key features are:

 Uplink/ MDI-II (media dependent interface) port for uplink to

another switch, hub or repeater.

 Store and forward switching scheme capability. As the result of

complete frame checking and error frame filtering, this scheme

prevents error packages from transmitting among segments.

 NWay Auto-negotiation for any port. This allows for auto-

sensing of speed (10/100Mbps) thereby providing you with

automatic and flexible solutions in your network connections.

 Flow control for any port. This minimizes dropped packets by

sending out collision signals when the port’s receiving buffer is

full. Note that flow control is only available in half duplex

mode.

 Data forwarding rate per port is at wire-speed for 100Mbps

speed.

 Data forwarding rate per port is at wire-speed for 10Mbps speed.

 Data filtering rate eliminates all error packets, runts, etc., per

port at wire-speed for 100Mbps speed.

 Data filtering rate eliminates all error packets, runts, etc., per

port at wire-speed for 10Mbps speed.

 16K MAC address entries table per device for the DSS-8+.

 256 KB RAM buffer per device for the DSS-8+.

 Network looped detecting.

Unpacking and Setup

This chapter provides unpacking and setup information for the

DSS-8+.

Unpacking

Open the box and carefully unpacks its contents. The box should

contain the following items:

♦One DSS-8+

♦One external power adapter

♦One pair of Stacking Brackets

♦This User’s Guide.

If any item is found missing or damaged, please contact your local

reseller for replacement.

Setup

The setup for the DSS-8+ can be performed using the following steps:

 The surface must support at least 1.5 Kg for the DSS-8+.

 The power outlet should be within 1.82 meters (6 feet) of the

DSS-8+.

 Visually inspect the DC power jack and make sure that it is fully

secured to the power adapter.

 Make sure that there is proper heat dissipation from and

adequate ventilation around the DSS-8+. Do not place heavy

objects on the DSS-8+.

IDENTIFYING EXTERNAL COMPONENTS

This section identifies all the major external components of the

DSS-8+. 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

The figure below shows the front panel of the DSS-8+.

♦LED Indicator Panel

Refer to the LED Indicator section for detailed information about

each of the DSS-8+’s LED indicators.

LED Indicators

Power Indicator (PWR)

This indicator lights green when the hub is receiving power, otherwise,

it is off.

Loop Detect (LOOP)

When this indicator lights amber, it means that there is a loop detected,

then the network needs to be re-configuration.

Full-Duplex/Collision (Full-Duplex/Collision)

This LED indicator lights green when a respective port is in full

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