D-Link DGS-1008TL Manuale utente

DGS-1008TL

8-Port 10/100/1000Mbps

Gigabit Ethernet Switch

Manual

RECYCLABLE

Rev.1.20

29071600GS08010

TABLE OF CONTENTS

ABOUT THIS MANUAL ........................................................................................................ 1

TERMS ..................................................................................................................................... 1

OVERVIEW OF THIS MANAUL ................................................................................................. 1

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

GIGABIT ETHERNET TECHNOLOGY......................................................................................... 2

SWITCHING TECHNOLOGY ...................................................................................................... 3

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

IEEE802.1P AND QOS ............................................................................................................ 6

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

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

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

UNPACKING AND SETUP.................................................................................................... 8

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

SETUP ...................................................................................................................................... 9

DESKTOP OR SHELF INSTALLATION........................................................................................ 9

RACK INSTALLATION ............................................................................................................ 10

IDENTIFYING EXTERNAL COMPONENTS.................................................................. 11

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

LED INDICATORS.................................................................................................................. 11

REAR PANEL ......................................................................................................................... 13

TECHNICAL SPECIFICATIONS....................................................................................... 14

ABOUT THIS MANUAL

This manual will tell you how to install your D-Link DGS-1008TL

8-Port 10/100/1000Mbps Gigabit Ethernet Switch, and how to

connect it to your Gigabit Ethernet network.

Terms

For simplicity, this documentation uses the terms “Switch” (first

letter upper case) to refer to the DGS-1008TL 8-Port

10/100/1000Mbps Gigabit Ethernet Switch, and “switch” (first

letter lower case) to refer to all Ethernet switches, including the

DGS-1008TL 8-Port 10/100/1000Mbps Gigabit Ethernet Switch.

Overview of this Manaul

Introduction. Describes the Switch and its features.

Unpacking and Setup. 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 specifications of

the Switch.

INTRODUCTION

This section describes the features of the DGS-1008TL 8-Port

10/100/1000Mbps Gigabit Ethernet Switch, as well as giving some

background information about Gigabit Ethernet and switching

technology.

Gigabit Ethernet Technology

Gigabit Ethernet is an extension of IEEE 802.3 Ethernet, utilizing

the same packet structure, format, and support for CSMA/CD

protocol, full-duplex mode, flow control, and management objects,

but with a tenfold increase in theoretical throughput over 100Mbps

Fast Ethernet and a hundredfold increase over 10Mbps Ethernet.

Since it is backwards compatible with all 10Mbps and 100Mbps

Ethernet environments, Gigabit Ethernet provides a straightforward

upgrade without rendering a company’s existing investment in

hardware, software, and trained personnel obselete.

The increased speed and extra bandwidth offered by Gigabit

Ethernet is essential to coping with the network bottlenecks that

frequently develop as computers and their buses get faster and more

users use high-bandwidth applications that generate more traffic.

Upgrading key components, such as backbone and servers, to

Gigabit Ethernet can greatly improve network response times as

well as significantly speed up the traffic between your subnets.

Gigabit Ethernet supports video conferencing, complex imaging,

and similar data-intensive applications. Likewise, since data

transfers occur 10 times faster than Fast Ethernet, servers outfitted

with Gigabit Ethernet NIC’s are able to perform 10 times the

number of operations in the same amount of time.

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 a 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 and dedicated bandwidth for all

connections. This is in contrast to 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 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 Ethernet

network beyond the 205-meter network diameter limit for

100BASE-TX networks. Switches supporting both traditional

10Mbps Ethernet, 100Mbps Fast Ethernet, 1000Mbps Gigabit

Ethernet are also ideal for bridging between existing 10Mbps

networks, 100Mbps networks, and new 1000Mbps 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 DGS-1008TL 8-Port 10/100/1000Mbps Gigabit Ethernet

Switch was designed for easy installation and high performance in

an environment where traffic on the network and the number of

users increase continuously.

Eight 10/100/1000Mbps Auto-negotiating, Auto-MDI/MDIX

Ethernet ports

Full/half duplex transfer mode for 10Mbps and 100Mbps

Full duplex transfer mode for 1000Mbps

Wire speed reception and transmission

Store-and-Forward switching method

Integrated address look-Up engine, supports 4K absolute MAC

addresses

Supports 128KBytes data buffer per device

Extensive front-panel diagnostic LEDs

IEEE 802.3x flow control for full-duplex

Back pressure flow control for half duplex

IEEE 802.1p priority queues

Jumbo Frame Support (9000Bytes)

IEEE802.1P AND QOS

The DGS-1008TL 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

Class-1

1 47

2 3 5 6

Mapping QoS on the Switch

The picture above shows the default priority setting for the Switch.

Class-1 has the 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 untagged pkt will follow the priority 0 to work (i.e. class 0)."

Understanding QoS

The Switch has two priority queues labeled as 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

This chapter provides unpacking and setup information for the

Switch.

Unpacking

Open the shipping carton of the Switch and carefully unpack its

contents. The carton should contain the following items:

One DGS-1008TL 8-Port 10/100/1000Mbps Gigabit Ethernet

Switch

Accessory pack: 2 mounting brackets and screws

Four rubber feet with adhesive backing

One AC power cord

Quick Installation Guide

This manual

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

for replacement.

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