D-Link DES-1008D User Manual

10/100 Dual-Speed Switch User’s Guide
4
Introduction
Eliminating Network Bottlenecks
Collisions are a normal occurrence when using Ethernet and they
don’t usually have a noticeable affect on overall network
performance. However, when too many stations are competing for
use of the network, collision rates can become very high and
network performance can be affected. Degraded performance is
characterized by long delay times, usually the result of high
collision rates in certain components or network segments. These
congested areas are called bottlenecks.
An area of the network where collisions can occur is called a
collision domain or segment. Switches, by their very nature are
outside collision domains; each port on a switch is a separate
collision domain, and stations connected to different ports on a
switch reside in different collision domains. A switch allows high-
speed, collision-free communication between the collision domains
connected to it.
If, for example, eight Ethernet stations are connected to an
Ethernet hub, they share the 10 Mbps Ethernet bandwidth. This
results in an average bandwidth per station of 1.25 Mbps. If the
same eight stations are connected to an Ethernet switch, each
station has 10 Mbps of dedicated, collision-free bandwidth. Since
collisions cannot occur, traffic is sure to flow between the connected
segments.
Eliminating network bottlenecks involves identifying the major
sources of network traffic (network servers for example) and giving
them their own Fast Ethernet and/or switched connections. Also,
switches can be used to divide collision domains containing many
users into smaller, less populated segments, thus distributing the
network load and reducing competition for the wire.

D-Link DES-1008D Specifications

General

Switch type	Unmanaged
Switch layer	-
Power connector	DC-in jack
Installed SFP modules quantity	0
Basic switching RJ-45 Ethernet ports type	Fast Ethernet (10/100)
Basic switching RJ-45 Ethernet ports quantity	8
10G support	No
Full duplex	Yes
Networking standards	IEEE 802.3, IEEE 802.3x
Copper ethernet cabling technology	100BASE-TX, 10BASE-T
MAC address table	1024 entries
Product color	Black
Maximum data transfer rate	100 Mbit/s
Mean time between failures (MTBF)	116186 h
Input current	1 A
Output voltage	5 V
Package depth	158 mm
Package width	104 mm
Package height	94 mm
Package weight	310 g
Pallet width	1200 mm
Pallet length	1100 mm
Pallet height (air)	1885 mm
Pallet gross weight (air)	330500 g
Quantity per pallet (air)	1000 pc(s)
Shipping (inner) case width	211 mm
Shipping (inner) case height	350 mm
Shipping (inner) case length	543 mm
Shipping (inner) case weight	6230 g
Shipping (inner) case net weight	3960 g
Number of cartons per pallet (air)	50 pc(s)
Quantity per shipping (inner) case	20 pc(s)
Harmonized System (HS) code	85176990