D-Link DES-1048G, Manual

D-Link DES-1048G Unmanaged Layer 2 Ethernet Switch

SECTION 1 

Introduction 

Ethernet Technology 
Switch Description

Features 
Ports 
Front-Panel Components 
 Side Panel Description 
Rear Panel Description 

Ethernet Technology 

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 are proposed to provide 
greater bandwidth and improve client/server response times. Among them, Fast Ethernet, or 100BASE-T, 
provides a non-disruptive, smooth evolution from 10BASE-T technology.  
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 
Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Ethernet protocol.  
 

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 100Mbps Fast Ethernet and a one hundred-fold increase over 10Mbps Ethernet. 
Since it is compatible with all 10Mbps and 100Mbps 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 is 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 subnetworks.  

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.

Switching Technology 

Another key development pushing the limits of Ethernet technology is in the field 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 making it possible for a local area 

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