D-Link DES-1016D - Switch Manual de usuario

D-Link®DES-1016D

16-Port 10/100Mb sp

Ethernet Switch

Manual

TABLE OF CONTENTS

About This Guide........................................................................2

PURPOSE .................................................................................................... 2

TERMS/USAGE........................................................................................... 2

OVERVIEW OF THIS USER’S GUIDE........................................................... 2

Introduction .................................................................................3

FAST ETHERNET TECHNOLOGY ............................................................... 3

FEATURES.................................................................................................. 5

IEEE802.1p QoS .........................................................................5

ADVANTAGES OF QOS............................................................................... 6

MAPPING QOSON THE SWITCH................................................................ 7

UNDERSTANDING QOS.............................................................................. 7

Unpacking and Setup...................................................................8

UNPACKING ............................................................................................... 8

SETUP......................................................................................................... 8

DESKTOP INSTALLATION .......................................................................... 9

RACK MOUNTING...................................................................................... 9

Identifying External Components .............................................11

FRONT PANEL.......................................................................................... 11

REAR PANEL............................................................................................ 12

Technical Specifications............................................................13

Technical Specifications............................................................14

ABOUT THIS GUIDE

Congratulations on your purchase of the DES-1016D 16-port

10/100Mbps Fast Ethernet Switch. This device integrates 100Mbps

Fast Ethernet and 10Mbps Ethernet network capabilities into one

highly flexible solution.

Purpose

This guide discusses how to install your DES-1016D.

Terms/Usage

In this guide, the term “Switch” (first letter upper case) refers to your 16-port

10/100Mbps Fast Ethernet Switch, and ”switch” (first letter lower case)

refers to other Ethernet switches.

Overview of this User’s Guide

Introduction. Describes the Switch and its features.

Unpacking and Installation.Helps you get started with the basic installation

of the Switch.

Identifying External Components. Describes the front panel, rear panel and

LED indicators of the Switch.

Technical Specifications. Lists the technical (general, physical and

environmental, and performance) specifications of the Switch.

INTRODUCTION

This chapter describes the features of the DES-1016D and some background

information about Ethernet/Fast Ethernet switching technology.

Fast Ethernet Technology

Ethernet, along with its speedier counterpart Fast Ethernet, is the

most popular networking standard in use today. 100BaseT Fast

Ethernet is an extension of the 10BaseT Ethernet standard,

designed to raise the data transmission capacity of 10BaseT from

10Mbits/sec to 100Mbits/sec. An important strategy incorporated by

100BaseT is its use of the Carrier Sense Multiple Access with

Collision Detection (CSMA/CD) protocol - which is the same

protocol that 10BaseT uses - because of its ability to work with

several different types of cable, including basic twisted-pair wiring.

Both of these features play an important role in network

considerations, and they make 100BaseT an attractive migration

path for those networks based on 10BaseT. 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

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

available to users on a LAN. If an Ethernet network begins to display

symptoms of congestion, low throughput, slow response times, and high rates

of collision, installing a switch to an network can preserve much or all of the

existing network's cabling and workstation interface card infrastructure while

still greatly enhancing the throughput for users. A switch is a viable solution

even if demanding applications, such as multimedia production and video

conferencing, are on the horizon. The most promising techniques, as well as

the best return on investment, could well consist of installing the right

mixture of Ethernet switches.

A switch increases capacity and decreases network loading by dividing a

local area network into different LAN segments. Dividing a LAN into

multiple segments is one of the most common ways of increasing available

bandwidth. If segmented correctly, most network traffic will remain within a

single segment, enjoying the full-line speed bandwidth of that segment.

Switches provide full-line speed, dedicated to bandwidth for all connections.

This is in contrast to the hubs, which use the traditional shared networking

topology, where the connected nodes contend for the same network

bandwidth. When two switching nodes are communicating, they are

connected with a dedicated channel between them, so there is no contention

for network bandwidth with other nodes. As a result, the switch reduces

considerably the likelihood of traffic congestion.

For Fast Ethernet networks, a switch is an effective way of eliminating the

problem of chaining hubs beyond the “two-repeater limit.” A switch 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. Switches 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 hubs and 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 DES-1016D is a high-performance switch designed specifically for

environments where traffic on the network and the number of users increase

continuously.

16-port 10/100Mbps Ethernet Switch with RJ-45 connectors

Supports Auto-negotiation of speed and duplex modes for each

port

Supports Auto-MDI/MDIX on each port, eliminating the need

for cross over cables or uplink ports

Wire-speed reception and transmission

Store-and-Forward switching method

Supports 8K MAC addresses

Supports 256KBytes (2Mbits) RAM for data buffering

Front-panel diagnostic LEDs

IEEE 802.3x flow control for full-duplex

Back pressure flow control for half-duplex

Supports IEEE 802.1p QoS, 2 Queues (Strict Mode)

IEEE802.1P QOS

The DES-1016D Switches support 802.1p priority queuing Quality of Service.

The implementation of QoS (Quality of Service) and benefits of using 802.1p

priority queuing are described here.

Advantages of QoS

QoS is an implementation of the IEEE 802.1p standard that allows network

administrators a method of reserving bandwidth for important functions that

require a large bandwidth or have a high priority, such as VoIP (voice-over

Internet Protocol), web browsing applications, file server applications or

video conferencing. Not only can a larger bandwidth be created, but other

less critical traffic can be limited, so bandwidth can be saved. The Switch

has separate hardware queues on every physical port to which

packets from various applications are mapped to and assigned a

priority. The illustration below shows how 802.1p priority queuing

is implemented on the Switch. The eight IEEE 802.1p priority

levels defined by the standard are mapped to the two class queues

used in the Switch.

2 Priority Queues

Queues:

Priority:

Class-0

0 14 72 3 5 6

Class-1

Mapping QoS on the Switch

The picture above shows the default priority setting for the Switch. Class-1

has higher priority than Class-0 on the Switch. In order to implement QoS,

the user is required to instruct the Switch to examine the header of a packet to

see if it has the proper identifying tag tagged. Then the user may forward

these tagged packets to designated queues on the Switch where they will be

emptied, based on priority.

"The DUT support strict mode for 802.1p QoS. The untagged pkt will follow

the priority 0 to work (i.e. class 0)."

Understanding QoS

The Switch has two priority queues labeled 1 (higher queue), and 0 (lower

queue). The eight priority tags, specified in IEEE 802.1p are mapped to the

Switch's priority tags as follows:

Priority 0 is assigned to the Switch's Q0 queue.

Priority 1 is assigned to the Switch's Q0 queue.

Priority 2 is assigned to the Switch's Q0 queue.

Priority 3 is assigned to the Switch's Q0 queue.

Priority 4 is assigned to the Switch's Q1 queue.

Priority 5 is assigned to the Switch's Q1 queue.

Priority 6 is assigned to the Switch's Q1 queue.

Priority 7 is assigned to the Switch's Q1 queue.

The Switch uses strict priority for Scheduling. Strict priority-based scheduling,

any packets residing in the higher priority queues are transmitted first.

UNPACKING AND SETUP

Unpacking

Open the shipping cartons of the DES-1016D and carefully unpack its

contents. The carton should contain the following items:

One DES-1016D 16-port 10/100Mbps Fast Ethernet

Switch

One AC power cord

Four rubber feet to be used for shock cushioning

Screws and two mounting brackets

Quick Installation Guide

CD with documentation

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

for replacement.

Setup

The setup of the DES-1016D can be performed by using the following steps:

The surface must support at least 11 lbs (5 kg).

The power outlet should be within 6 feet (1.42 meters)

of the device.

Visually inspect the power cord and see that it is

secured fully to the AC power outlet.

Make sure that there is adequate ventilation around

the Switch.

Do not place heavy objects on the Switch.

Desktop Installation

When installing the DES-1016D on a desktop or shelf, the rubber feet

included with the device should be attached first, to minimize scratching or

scarring of the surface on which the Switch is placed. Attach these

cushioning feet on the bottom at each corner of the device. Allow enough

ventilation space between the device and the objects around it.

Fast Ethernet Switch installed on a Desktop or Shelf

Rack Mounting

The DES-1016D can be mounted in an EIA standard-size 19-inch rack, in a

wiring closet with other equipment. Attach the mounting brackets on each

side of the Switch’s front panel (as shown in the illustration below), and

secure them with the screws provided.

Attaching the mounting brackets to the Switch

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