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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:
²
RFC1213 MIB II.
²
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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