D-Link DGS-1008TL User manual

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

1
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.

2
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.

3
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.

4
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.

5
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)

6
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
0
Class-1
1 47 2 3 5 6

7
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.

8
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.