D-Link D Link 8 Port Manual

							 
3 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 don’t compete with each other 
for network transmission capacity. 
The DES-1008D acts as a high-speed selective bridge between the 
individual segments.  The DES-1008D, 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. 
For Fast Ethernet networks, a DES-1008D is an effective way of 
eliminating problems of chaining hubs beyond the “two-repeater 
limit.” A DES-1008D can be used to split parts of the network into 
different collision domains, making it possible to expand your Fast 
Ethernet network beyond the 205-meter network diameter limit for 
100BASE-TX networks.  DES-1008Ds supporting both traditional 
10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal for 
bridging between the existing 10Mbps networks and the new 
100Mbps networks. 
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. 
 
  
						

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4 Features The DES-1008D was designed for easy installation and high 
performance in an environment where traffic on the network and the 
number of users increase continuously. 
The DES-1008D with its small, compact size was specifically 
designed for small to middle workgroups. The DES-1008D can be 
installed where space is limited; moreover, the DES-1008D provides 
immediate access to a rapidly growing network through a wide range 
of functions. 
The DES-1008D is ideal for deployment with multiple high-speed 
servers for shared bandwidth 10Mbps or 100Mbps workgroups. With 
the highest bandwidth 200Mbps (100Mbps full-duplex mode), any 
port can provide workstations with a congestion-free data pipe for 
simultaneous access to the server. 
The DES-1008D is expandable by cascading two or more DES-
1008Ds together.  As all ports support 200Mbps, the DES-1008D can 
be cascaded from any port and to any number of DES-1008Ds. 
The DES-1008D is a perfect choice for sites planning to upgrade to 
Fast Ethernet in the future.  Ethernet workgroups can connect to the 
DES-1008D now, and you can change adapters and hubs anytime later 
without needing to change the DES-1008Ds or reconfigure the 
network. 
The DES-1008D combines dynamic memory allocation with store-
and-forward switching to ensure that the buffer is effectively allocated 
for each port, while controlling the data flow between the transmit and 
receive nodes to guarantee against all possible packet loss. 
The DES-1008D is a managed 10/100 Fast Ethernet switch that offers 
solutions in accelerating small Ethernet workgroup bandwidth.  Other 
key features are:  
						

							 
5 ??Uplink/ MDI-II (media dependent interface) port for uplink to 
another switch, hub or repeater.   
??Store and forward switching scheme capability.  As the result of 
complete frame checking and error frame filtering, this scheme 
prevents error packages from transmitting among segments. 
??NWay Auto-negotiation for any port. This allows for auto-
sensing of speed (10/100Mbps) thereby providing you with 
automatic and flexible solutions in your network connections. 
??Flow control for any port. This minimizes dropped packets by 
sending out collision signals when the port’s receiving buffer is 
full.  Note that flow control is only available in half duplex 
mode. 
??Data forwarding rate per port is at wire-speed for 100Mbps 
speed. 
??Data forwarding rate per port is at wire-speed for 10Mbps 
speed. 
??Data filtering rate eliminates all error packets, runts, etc., per 
port at wire-speed for 100Mbps speed. 
??Data filtering rate eliminates all error packets, runts, etc., per 
port at wire-speed for 10Mbps speed. 
??8K MAC address entries table per device for the DES-1008D. 
??256 KB RAM buffer per device for the DES-1008D. 
??Network looped detecting. 
 
 
 
 
 
 
 
 
 
 
  
						

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6  
Unpacking and Setup This chapter provides unpacking and setup information for the 
DES-1008D. 
Unpacking Open the box and carefully unpacks its contents.  The box should 
contain the following items: 
? One DES-1008D 
? One external power adapter 
? This User’s Guide. 
If any item is found missing or damaged, please contact your local 
reseller for replacement. 
 
Setup The setup for the DES-1008D can be performed using the following 
steps: 
??The surface must support at least 1.5 Kg for the DES-1008D. 
??The power outlet should be within 1.82 meters (6 feet) of the 
DES-1008D. 
??Visually inspect the DC power jack and make sure that it is fully 
secured to the power adapter. 
??Make sure that there is proper heat dissipation from and 
adequate ventilation around the DES-1008D.  Do not place 
heavy objects on the DES-1008D.  
						

							 
7 IDENTIFYING EXTERNAL COMPONENTS This section identifies all the major external components of  the 
DES-1008D. Both the front and rear panels are shown followed by 
a description of each panel feature. The indicator panel is 
described in detail in the next chapter. 
 
Front Panel 
The figure below shows the front panel of the DES-1008D.  
 
? LED Indicator Panel 
 Refer to the LED Indicator section for detailed information about  
 each of the DES-1008D’s LED indicators. 
 
LED Indicators Power Indicator (PWR) 
This indicator lights green when the hub is receiving power, 
otherwise, it is off. 
Loop Detect (LOOP) 
When this indicator lights amber, it means that there is a loop 
detected, then the network needs to be re-configuration.  
						

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8  
Full-Duplex/Collision  (Full-Duplex/Collision) 
This LED indicator lights green when a respective port is in full 
duplex (FDX) mode.  Otherwise, it is blinking when collisions are 
occurring on the respective port. 
100M Link/Activity, 10M Link/Activity (100M LINK/ACT(green), 
10LINK/ACT(amber)) 
This indicator lights green when the port is connected to a 100Mbps 
Fast Ethernet station, if the indicator blinking green will be 
transmission or received data on the 100Mbps network. Otherwise, if 
the indicator light amber when the port is connected to a 10Mbps 
Ethernet station, if the indicator blinking amber will be transmission 
or received data on the 10Mbps network. 
 
Rear Panel  
 
? DC Power Jack: Power is supplied through an external AC power 
adapter.  Check the technical specification section for information 
about the AC power input voltage.   
Since the DES-1008D does not include a power switch, plugging its 
power adapter into a power outlet will immediately power it on. 
  
						

							 
9  
? MDI-X Jacks: Use these jacks to connect stations to the hub. These 
are MDI-X (Medium-Dependent Interface, Cross-wired) jacks, 
which mean, you can use ordinary straight-through twisted-pair 
cables to connect user machines and servers to the hub through 
them. If you need to connect another device with an MDI-X jack, 
such as another hub or an Ethernet switch, you should use a 
crossover cable, or make the connection using the MDI-X jack 
(described below). 
? Uplink Jack(s) (MDI-II): Use this jack to connect stations to the 
hub. This is an MDI-II (Medium-dependent Interface, straight-
wired) jack, which means you can connect the hub to a device with 
an MDI-X port using an ordinary straight-through cable, making a 
crossover cable unnecessary. 
 
 
  
						

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10 CONNECTING THE DES-1008D This chapter describes how to connect the DES-1008D to your Fast 
Ethernet network.  In each of the following figures, the DES-1008D is 
shown.  
PC to DES-1008D A PC can be connected to DES-1008D via a two-pair Category 3, 4, 5 
UTP/STP straight cable.  The PC (equipped with a RJ-45 10/100Mbps 
phone jack) can be connected to any of the 8 ports (1x - 8x).   
The LED indicators for PC connection depend on the LAN card’s 
capabilities. If LED indicators are not lit after making a proper 
connection, check the PC LAN card, the cable and the DES-1008D 
conditions and connections. 
The following are LED indicator possibilities for a PC to DES-1008D 
connection:  
1. The “100LINK/ACT,10LINK/ACT” LED indicator lights 
green for hookup to 100Mbps speed or light amber for 
hookup to 10Mbps speed. 
2. The “Full-Duplex/Collision” LED indicator depends upon 
LAN card capabilities for full duplex or half duplex.  
Hub to DES-1008D A hub (10 or 100BASE-TX) can be connected to the DES-1008D via 
a two-pair Category 3, 4, 5 UTP/STP straight cables.  The connection 
is accomplished from the hub uplink (MDI-II) port to any of the DES-
1008D (MDI-X) ports: 1x - 8x for the DES-1008D.   
						

							 
11 A. 10BASE-T Hub  
For a 10BASE-T hub, the DES-1008D LED indicators should light up 
as the following:  
“Full-Duplex/Collision” indicator is OFF. 
“100LINK/ACT,10LINK/ACT LED” indicator is light amber. 
B. 100BASE-TX Hub 
For a 100BASE-TX hub, the DES-1008D LED indicators should light 
up as the following: 
“Full-Duplex/Collision” LED indicator is OFF.  
“100LINK/ACT,10LINK/ACT” LED indicator is light green. 
Hub without Uplink (MDI-II) port If a hub is not equipped with an uplink (MDI-II) port, connection can 
be made using either straight cable or crossover cable. 
A. Using straight cable 
When using straight cable, the connection can be made from the 
uplink (MDI-II) port of the DES-1008D to any port of the hub. 
B. Using crossover cable 
When using crossover cable, the connection can be made from any 
(MDI-X) ports of the DES-1008D to any port of the Hub. 
DES-1008D to switch (other devices) The DES-1008D can be connected to another switch or other devices 
(routers, bridges, etc.) via a two-pair Category 3, 4, 5 UTP/STP 
straight or crossover cable.   
						

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12 A. Using straight cable  
When using straight cable, this is done from the uplink (MDI-II) port 
of the DES-1008D (DES-1008D A) to any of the 10Mbps or 100Mbps  
(MDI-X) port of the other switch (switch B) or other devices. 
B. Using crossover cable  
When using crossover cable, this is done from any (MDI-X) port of 
the DES-1008D (DES-1008D A) to any of the 10Mbps, 100Mbps  
(MDI-X) port of the other switch (switch B) or other devices.  
1. The “100LINK/ACT,10LINK/ACT” LED indicator light 
green for hookup to 100Mbps speed or light amber for 
hookup to 10Mbps speed. 
2. The “Full-Duplex/Collision” LED indicator depends upon LAN 
card capabilities for full-duplex or half-duplex 
 
Port Speed & Duplex Mode After plugging the selected cable to a specific port, the system uses 
auto-negotiation to determine the transmission mode for any new 
twisted-pair connection: 
If the attached device does not support auto-negotiation or has 
auto-negotiation disabled, an auto-sensing process is initiated to 
select the speed and set the duplex mode to half-duplex.