D-Link DGS-1248T Router Manual PDF (Setup & Configuration Guide)

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ABOUT THIS MANUAL

Congratulations on your purchase of the DGS-1248T Web Smart 48-Port

10/100/1000Mbps Gigabit Switch. This device integrates 1000Mbps Gigabit

Ethernet, 100Mbps Fast Ethernet, and 10Mbps Ethernet network capabilities

in a highly flexible package.

Purpose

This manual discusses how to install your 48-Port 10/100/1000Mbps Gigabit

Web Smart Switch.

Terms/Usage

In this manual, the term “Switch” (first letter upper case) refers to your Web

Smart Switch, and “switch” (first letter lower case) refers to other Ethernet

switches.

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INTRODUCTION

This chapter describes the features of the DGS-1248T Web Smart 48-Port

10/100/1000Mbps Gigabit Switch and some background information about

Ethernet/Fast Ethernet/Gigabit Ethernet 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,

flow control, and management objects, but with a tenfold increase in

theoretical throughput over 100-Mbps Fast Ethernet and a hundredfold

increase over 10-Mbps Ethernet. Since it is compatible with all 10-Mbps and

100-Mbps Ethernet environments, Gigabit Ethernet provides a straightforward

upgrade without wasting a company’s existing investment in hardware,

software, and trained personnel.

The increased speed and extra bandwidth offered by Gigabit Ethernet are

essential to coping with the network bottlenecks that frequently develop as

computers and their busses get faster and more users use applications that

generate more traffic. Upgrading key components, such as your 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 enables fast optical fiber connections to support 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.

In addition, the phenomenal bandwidth delivered by Gigabit Ethernet is the

most cost-effective method to take advantage of today and tomorrow’s rapidly

improving switching and routing internetworking technologies. And with

expected advances in the coming years in silicon technology and digital signal

processing that will enable Gigabit Ethernet to eventually operate over

unshielded twisted-pair (UTP) cabling, outfitting your network with a

powerful 1000-Mbps-capable backbone/server connection creates a flexible

foundation for the next generation of network technology products.

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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 guarantees

cost-effective and high performance Fast Ethernet solutions.

100Mbps Fast Ethernet is a 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 do not compete with each other for network transmission

capacity.

The switch acts as a high-speed selective bridge between the individual

segments. The switch, 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.

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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.

VLAN (Virtual Local Area Network)

A VLAN is a group of end-stations that are not constrained by their physical

location and can communicate as if a common broadcast domain, a LAN. The

primary utility of using VLAN is to reduce latency and need for routers, using

faster switching instead. Other VLAN utility includes:

Security: Security is increased with the reduction of opportunity in

eavesdropping on a broadcast network because data will be switched to only

those confidential users within the VLAN.

Cost Reduction: VLANs can be used to create multiple broadcast domains,

thus eliminating the need of expensive routers.

Features

48×10/100/1000Mbps Auto-negotiation Gigabit Ethernet ports

4 x 1000Mbps SFP(Mini GBIC) (Auto-Sense) for optional SFP(Mini

GBIC) transceiver to extend distance, share with 4 1000BASE-T ports

All RJ-45 ports support auto MDI/MDIX, so there is no need to use

cross-over cables or an up-link port

Half-duplex transfer mode for connection speed 10Mbps and 100Mbps

Full-duplex transfer mode for connection speed of 10Mbps, 100Mbps,

and 1000Mbsps

Wire speed reception and transmission

Store-and-Forward switching scheme capability to support rate

adaptation and ensure data integrity

Up to 16K unicast addresses entities per device, self-learning, and table

aging

1632KBytes packet buffer

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Supports IEEE 802.3x flow control for full-duplex mode ports

Supports 802.1Q VLAN

Supports IEEE 802.1p QoS

Supports Trunk

Supports Port-mirroring

Support Jumbo-frame setting

Supports IEEE 802.1D Spanning Tree protocol

Support Simple Network Management Protocol (SNMP)

Supports MIB for:

RFC1213 MIB II.

Private MIB.

Supports Port-setting for Speed/Disable, Flow control

Easy configuration via Web Browser

Easy setting via Web Management Utility

Standard 19” Rack-mount size

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