D-Link DGS -1008D Unmanaged Gigabit Ethernet Switch When connecting or disconnecting power to hot -pluggable power supplies, if offered with your system, observe the following guidelines: Install the power supply before connecting the power cable to the power supply. Unplug the power cable before removing the power supply. If the system has multiple sources of power, disconnect power from the system by unplugging all power cables from the power supplies. Move products with care; ensure that all casters and/or stabilizers are firmly connected to the system. Avoid sudden stops and uneven surfaces.
General Precautions for Rack-Mountable Products
Observe the following precautions for rack stability and safety. Also, refer to the rack installation documentation accompanying the system and the rack for specific caution statements and procedures. Systems are considered to be components in a rack. Thus, "component" refers to any system as well as to various peripherals or supporting hardware.
CAUTION: Installing systems in a rack without the front and side stabilizers installed could cause the rack to tip over, potentially resulting in bodily injury under certain circumstances. Therefore, always install the stabilizers before installing components in the rack. After installing system/components in a rack, never pull more than one component out of the rack on its slide assemblies at one time. The weight of more than one extended component could cause the rack to tip over and may result in serious injury.
Before working on the rack, make sure that the stabilizers are secured to the rack, extended to the floor, and that the full weight of the rack rests on the floor. Install front and side stabilizers on a single rack or front stabilizers for joined multiple racks before working on the rack. Always load the rack from the bottom up, and load the heaviest item in the rack first. Make sure that the rack is level and stable before extending a component from the rack. Use caution when pressing the component rail release latches and sliding a component into or out of a rack; the slide rails can pinch your fingers. After a component is inserted into the rack, carefully extend the rail into a locking position, and then slide the component into the rack. Do not overload the AC supply branch circuit that provides power to the rack. The total rack load should not exceed 80 percent of the branch circuit rating. Ensure that proper airflow is provided to components in the rack. Do not step on or stand on any component when servicing other components in a rack. NOTE: A qualified electrician must perform all connections to DC power and to safety grounds. All electrical wiring must comply with applicable local or national codes and practices.
CAUTION: Never defeat the ground conductor or operate the equipment in the absence of a
suitably installed g round conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available.

CAUTION: The system chassis must be positively grounded to the rack cabinet frame. Do not
attempt to connect power to the system until grounding cables are connected. Completed power and safety ground wiring must be inspected by a qualified electrical inspector. An energy hazard will exist if the safety ground cable is omitted or disconnected.
Protecting Against Electrostatic Discharge
Static electricity can harm delicate components inside your system. To prevent static damage, discharge static electricity from your body before you touch any of the electronic components, such as the microprocessor. You c n do so by a periodically touching an unpainted metal surface on the chassis. You can also take the following steps to prevent damage from electrostatic discharge (ESD): 1. When unpacking a static-sensitive component from its shipping carton, do not remove the component from the antistatic packing material until you are ready to install the component in your system. Just before unwrapping the antistatic packaging, be sure to discharge static electricity from your body. 2. When transporting a sensitive component, first place it in an antistatic container or packaging. 3. Handle all sensitive components in a static-safe area. If possible, use antistatic floor pads, workbench pads, and an antistatic grounding strap.

SECTION 1

Introduction
Ethernet Technology 802.1P and QOS Switch Description Features Ports Front-Panel Components

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 companys existing investment in hardware, software, and trained personnel. The increased speed and extra bandwidth offered by Gigabit Ether net 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 subnetworks. Gigabit Ethernet enables fast optical fiber connections to support video conferencing, complex imaging, and similar dataintensive app lications. Likewise, since data transfers occur 10 times faster than Fast Ethernet, servers outfitted with Gigabit Ethernet NICs 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 tomorrows rapidly improving switching and routing internetworking technologies.

802.1P and QoS

The DGS-1008D Switch supports 802.1p priority queuing Quality of Service. The implementation of QoS (Quality of Service) and benefits of using 802.1p priority queuing are described here.

Advantages of QoS

QoS is an implementation of the IEEE 802.1p standard that allows network administrators a method of reserving bandwidth for important functions that require a large bandwidth or have a high priority, such as VoIP (voice-over Internet Protocol), web browsing applications, file server applications or video conferencing. Not only can a larger bandwidth be created, but other less critical traffic can be limited, so bandwidth can be saved. The Switch has separate hardware queues on every physical port to which packets from various applications are mapped to and assigned a priority. The illustration below shows how 802.1P priority queuing is implemented on the Switch. The eight IEEE 802.1P priority levels defined by the standard are mapped to the four class queues used in the Switch.
Mapping QoS on the Switch The picture above shows the default priority setting for the Switch. Class-3 has the highest priority of the four priority queues on the Switch. In order to implement QoS, the user is required to instruct the Switch to examine the header of a packet to see if it has the proper identifying tag tagged. Then the user may forward these tagged packets to designated queues on the Switch where they will be emptied, based on priority. "The DUT support strict mode for 802.1p QoS. The untagged pkt will follow the priority 0 to work (i.e. class 1)."

Understanding QoS

The Switch has four priority queues. These priority queues are labeled as 3, the high queue to 0, the lowest queue. The eight priority tags, specified in IEEE 802.1p are mapped to the Switch's priority tags as follows: Priority 0 is assigned to the Switch's Q1 queue. Priority 1 is assigned to the Switch's Q0 queue. Priority 2 is assigned to the Switch' s Q0 queue. Priority 3 is assigned to the Switch's Q1 queue. Priority 4 is assigned to the Switch's Q2 queue. Priority 5 is assigned to the Switch's Q2 queue. Priority 6 is assigned to the Switch's Q3 queue. Priority 7 is assigned to the Switch's Q3 queue.

The Switch uses strict priority for Scheduling. Strict priority-based scheduling, any packets residing in the higher priority queues are trans mitted first.

Switching Technology

Another key development pushing the limits of Et hernet 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 network to be divided into different s egments that do not compete with each other for network transmission capacity, decreasing the load on each segment. The switch acts as a high-speed selective bridge between the individual segments. Traffic that needs to go from one segment to another (from one port to another) is automatically forwarded by the switch, without interfering with any other segments (ports). This allows the total network capacity to be multiplied, while still maintaining the same network cabling and adapter cards. For Fast Ethernet or Gigabit Ethernet networks, a Switch is an effective way of eliminating problems of chaining hubs beyond the two-repeater limit. A Switch can be used to split parts of the network into di fferent collision domains, for example, making it possible to expand your Fast Ethernet network beyond the 205 -meter network diameter limit for 100BASE-TX networks. Switches supporting both traditional 10Mbps Ethernet and 100Mbps Fast Ethernet are also ideal for bridging between existing 10Mbps networks and 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 and the setup and maint enance required make routers relatively impractical. Todays Switches are an ideal solution to most kinds of local area network congestion problems.

Switch Description

The DGS -1008D Switch is equipped with five ports providing dedicat ed 10, 100, or 1000 Mbps bandwidth. These ports can be used for connecting PCs, printers, servers, routers, Switches, hubs, and other network devices. The five multi-speed ports use standard twisted pair cabling and are ideal for segmenting networks into small, connected subnets. Each port can support up to 2000 Mbps of throughput in full-duplex mode. This stand-alone Switch enables the network to use some of the most demanding multimedia and imaging applications concurrently with other user applications without creating bottlenecks.

Features

The DGS -1008D 8-Port 10/100/1000BASE-T Gigabit Ethernet Switch was designed for easy installation and high performance in an environment where traffic on the network and the number of users increase continuously. Eight 10/100/1000BASE-T Gigabit Ethernet ports Cable Diagnostic function at Switch boot up Supports Auto-Negotiation for 10/100/1000Mbps and duplex mode Supports Auto-MDI/MDIX for each port Supports Full/Half duplex transfer mode for 10 and 100Mbps Supports Full-duplex transfer mode for 1000Mbps Full wire speed reception and transmission Store-and-Forward switching method Supports 8K absolute MAC addresses Supports 144KBytes RAM for data buffering Extensive front-panel diagnostic LEDs IEEE 802.3x flow control for full duplex IEEE 802.1p priority queues Back pressure flow control for half duplex Jumbo Frame Support (9.6KBytes )

Front-Panel Components

The front panel of the Switch consists of LED indicators, 8 (10/100/1000 Mbps) Et hernet ports.
Figure 1-1. Front Panel View of the Switch Comprehensive LED indicators display the status of the Switch and the network.

LED Indicators

The LED indicators of the Switch include Power, 100/1000Mbps, and Link/Act. The following shows the LED indicators for the Switch along with an explanation of each indicator.
Figure 1-2. LED Indicators Comprehensive LED indicators display the conditions of the Switch and status of the network. A description of these LED indicators follows (see LED Indicators). The LED indicators of the Switch include Power, Link/Act, 1000Mbps, and 100Mbps. The Cable Diagnostic functions of the Switch are indicated by a combination of the Speed and the Link/Act LEDs, as described below. Power Indicator This green indicator illuminates when the Switch is receiving power. Link/Act This green indicator illuminates steadily when a port is connected to a station successfully and has a good link. The indicator will blink to indicate that a port is transmitting or receiving data on the network. Speed 1000Mbps/Green; 100Mbps/Amber; 10Mbps/Off This indicator is amber -colored when the port is connected to a 100Mbps Fast Ethernet station. It is green when the port is connected to a 1000Mbps Ethernet station. It is not illuminated when the port is connected to a 10Mbps Ethernet station. Cable Diagnostic LED Indications When the Switch is booted up (when the Switch is first powered on), the Cable Diagnostic function is initialized and run. The Cable Diagnostic function will detect three common faults in an Ethernet cable connecting the Switch to a remote network device: an open circuit (a lack of continuity between the pins at each end of the Ethernet cable or a disconnected cable), a short circuit (two or more conductors shortcircuited), and improper termination (a termination resistance greater than the specified 100 ohms). Any of these common cable faults will be detected by the Cable Diagnostic function, and the LEDs will display the results of the Cable Diagnostic function as follows: Open, Short, or Improper Termination Speed LED: Amber Link/Act LED: Off Cable connection good Speed LED: Green Link/Act LED: Off The Cable Diagnostic function operates only during the Switch boot up (when the Switch is first powered on). The Cable Diagnostic first scans the five Ethernet ports to determine if the Ethernet cable is in good working order. This process is indicated by the Speed LED blinking green for each of the five ports, sequentially. The initial port scan takes about 10 seconds. If a cable fault is detected, it is indicated by the corresponding ports Speed LED glowing amber for 5 seconds, after the initial port scan. The Switch is then reset for normal operation. It takes about 2 seconds for the Switch to reset. The entire Cable Diagnostic process takes about 17 seconds from the time the Switch is booted. Therefore, from the time power is first applied to the Switch, about 17 seconds is required before the Switch will begin normal operation. Note: There is no display of cable faults detected by the Cable Diagnostic during the normal operation of the Switch, only when the Switch is booted up or power-cycled.

NOTE: The Cable Diagnostic function does not support 10M/100M. If the port is connected to a 10M/100M device, see the Link LED to check if the cable is good or not.

Rear Panel Description

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.
Figure 1-3. Rear panel view of the Switch 10/100/1000BASE-T Ports: Eight (8) Gigabit Ethernet, Auto-Negotiating ports (10/100/1000Mbps) Comprehensive LED indicators display the conditions of t he Switch and status of the network.

SECTION 2

Installation
Package Contents Before You Connect to the Network Installing the Switch Power On

Package Contents

Open the shipping carton of the Switch and carefully unpack its contents. The carton should contain the following items: One DGS-1008D 8-Port 10/100/1000BASE-T Gigabit Ethernet Switch Four rubber feet with adhesive backing One external power adapter Wall-mounting kit This manual
If any item is missing or damaged, please contact your local D-Link reseller for replacement.
Before You Connect to the Network
The site where you install the Switch may greatly affect its pe rformance. Please follow these guidelines for setting up the Switch. Install the Switch on a sturdy, level surface that can support at least 3 kg (6.6 lbs.) of weight. Do not place heavy objects on the Switch. The power outlet should be within 1.82 meters (6 feet) of the Switch. Visually inspect the power cord and see that it is fully secured to the AC power port. Make sure that there is adequate space for proper heat dissipation from and adequate ventilation around the Switch. Leave at least 10 cm (4 inches) of space at the front and rear of the Switch for ventilation. Install the Switch in a fairly cool and dry place for the acceptable temperature and humidity operating ranges. Install the Switch in a site free from strong electromagnetic field generators (such as motors), vibration, dust, and direct exp osure to sunlight. When installing the Switch on a level surface, attach the rubber feet to the bottom of the device. The rubber feet cushion the Switch, protect the casing from scratches, and prevent it from scratching other surfaces.
Mounting the Switch on a Wall
The DGS -1008D can be mounted on a wall. Two mounting slots are provided on the bottom of the Switch for this purpose. Make sure that the front panel is exposed in order to view the LEDs. Refer to the illustration below:

A.) Cement wall

1. 2. 3. Mount the nylon screw anchors into a cement wall. Drive the T3 x 15L screws into the nylon screw anchors. Hook the mounting holes at the back of the switch onto the screws. The wall-mount process is complete.

B.) Wooden wall

1. 2. Insert the T3 x 15 L screws into the wood wall. Hook the mounting holes at the back of the switch onto the screws. The wall-mount process is complete.
3/4 inch minimu m for a wooden wall.
3 inch minimum for a cement wall.
Figure 2 - 1. Mounting the Switch to a Wall
Attaching the Rubber Feet
Use the rubber feet provided. Position and apply the rubber feet to the underside of the DGS-1008D Switch.
Figure 2 -2. Attaching the Rubber Feet
CAUTION: Do not place any device on top of Switch, or place the Switch on top of any device
or object that will block the free flow of air through the ventilation slots on the sides, top, and bottom of the Switchs case. In addition, care should be taken not to locate the Switch next to, on top of, or underneath any device that generates a significant amount of heat. For the Switch to perform at its optimal level, the Switch must have adequate ventilation to prevent the Switch from overheating and becoming damaged.

Power On

Plug one end of the AC to DC power converter into the power connector of the Switch and the other end into the local power source outlet. After the Switch is powered on, the LED indicators will momentarily blink. This blinking of the LED indicators represents a reset of the system.

Power Failure

As a precaution, in the event of a power failure, unplug the Switch. When power is resumed, plug the Switch back in.

Section 3

Connecting The Switch
Switch To End Node Switch To Hub or Switch Connecting To a Server
NOTE: All 8 high -performance NWay Ethernet ports can support both MDI-II and MDI-X connections.

Switch To End Node

End nodes include PCs outfitted with a 10, 100, or 1000 Mbps RJ-45 Ethernet/Fast Ethernet Network Interface Card (NIC) and most routers. An end node can be connected to the Switch via a twisted-pair Category 3, 4, 5, or 5e UTP/STP cable. The end node can be connected to any of the ports of the Switch.

Figure 3-1. Switch connected to an end node The Link/Act LEDs for each UTP port light green when the link is valid. The LED over the port label indicates a port speed of either 10/100 Mbps or 1000Mbps. A blinking LED on the bottom indicates packet activity on that port.

Switch to Hub or Switch

These connections can be accomplished in a number of ways using a standard Ethernet cable. A 10BASE-T hub or switch can be connected to the Switch via a twisted-pair Category 3, 4, 5, or 5e UTP/STP cable. A 100BASE-T hub or switch can be connected to the Switch via a twisted -pair Category 5 UTP/STP cable. A 1000BASE-T switch can be connected to the Switch via a twisted -pair Category 5e or better UTP/STP cable.
Figure 3-2. Switch connected to a port on a hub or switch using either a straight or crossover cableany standard Ethernet cable is fine
Connecting To Network Backbone or Server
Any of the five Gigabit Ethernet ports are ideal for uplinking to a network backbone or network server.
Figure 3-3. Connection to a Server

Appendix A

Technical Specifications

General

Standards: IEEE 802.3ab 1000BASE -T IEEE 802.3u 100BASE-TX IEEE 802.3 10BASE-T IEEE 802.3x Flow Control IEEE 802.1p priority Queues Protocol: Data Rate: Transfer CSMA/CD Ethernet: 10Mbps 20Mbps Fast Ethernet: 100Mbps 200Mbps Gigabit Ethernet: Topology: Network Cables: Star Ethernet: Fast Ethernet: 2-pair UTP Cat. 3,4,5, Unshield Twisted Pair (UTP) Cable 2-pair UTP Cat. 5, Unshield Twisted Pair (UTP) Cable 2000Mbps (Half-duplex) (Full-duplex) (Half-duplex) (Full-du plex) (Full-duplex)
Gigabit Ethernet: 4-pair UTP Cat. 5, Unshield Twisted Pair (UTP) Cable Number of Ports: Eight 10/100/1000BASE-T Gigabit Ethernet ports
Physical and Environmental
AC-DC 7.5V/1A This unit is to be used with a power supply listed below, or equivalent: DC Inputs: Power Consumption: Operating Temperature: Storage Temperature: Humidity: Dimensions : EMI Safety: AM-0751000D41 for USA AM-0751000S41 for Australia AM-0751000B for UK AM-0751000M for China AM-0751000V for Europe
3.8 watts (maximum ) 32F ~ 104 F (0 C ~ 40 ? ) 14F ~ 158F (-1 0C ~ 70C) 5% ~ 95% RH, non-condensing 5.59 in. x 4.53 in. x 1.18 in. (142 mm x 115 mm x 31mm) FCC Class B, CE Mark Class B, VCCI cUL
D-Link DGS -1008D Unmanaged Gigabit Ethernet Switch Performance Transmission Method: RAM Buffer : Filtering Address Table: Packet Filtering/ Forwarding Rate: MAC Address Learning: Store-and-forward 144KBytes per device 8K MAC address per device Full wire speed Self-learning, auto-aging

Glossary

1000BASE -LX A short laser wavelength on multimode fiber optic cable for a maximum length of 550 meters. 1000BASE -SX A long wavelength for a "long haul" fiber optic cable for a maximum length of 10 kilometers. 100BASE -FX 100Mbps Ethernet implementation over fiber. 100BASE -TX 100Mbps Ethernet implementation over Category 5 and Type 1 Twisted Pair cabling. 10BASE-T The IEEE 802.3 specification for Ethernet over Unshielded Twisted Pair (UTP) cabling. aging The automatic removal of dynamic entries from the Switch Database which have timed-out and are no longer valid. ATM Asynchronous Transfer Mode. A connection oriented transmission protocol based on fixed length cells (packets). ATM is designed to carry a complete range of user traffic, including voice, data, and video signals. auto-negotiation A feature on a port, which allows it to advertise its capabilities for speed, duplex, and flow control. When connected to an end station that also supports auto -negotiation, the link can self-detect its optimum operating setup. backbone port A port that does not learn device addresses, and that receives all frames with an unknown address. Backbone ports are normally used to connect the Switch to the backbone of your network. Note that backbone ports were formerly known as designated downlink ports. backbone The part of a network used as the primary path for transporting traffic between network segments. Bandwidth Information capacity, measured in bits per second, which a channel can transmit. The bandwidth of Ethernet is 10Mbps, the bandwidth of Fast Ethernet is 100Mbps. baud rate The switching speed of a line. Also known as line speed. BOOTP The BOOTP protocol allows you to a utomatically map an IP address to a given MAC address each time a device is started. In addition, the protocol can assign the subnet mask and default gateway to a device. bridge A device that interconnects local or remote networks no matter what higher-level protocols are involved. Bridges form a single logical network, centralizing network administration. broadcast A message sent to all destination devices on the network. broadcast storm Multiple simultaneous broadcasts that typically absorb available network bandwidth and can cause network failure. console port The port on the Switch accepting a terminal or modem connector. It changes the parallel arrangement of data within computers to the serial form used on data transmission links. This port is most often used for dedicated local management. CSMA/CD Channel access method used by Ethernet and IEEE 802.3 standards, in which devices transmit only after finding the data channel clear for some period of time. When two devices transmit simultaneously, a collision occurs and the colliding devices delay their retransmissions for a random amount of time. data center switching The point of aggregation within a corporate network where a switch provides highperformance access to server farms, a high-speed backbone connection, and a control point for network management and security. Ethernet A LAN specification developed jointly by Xerox, Intel, and Digital Equipment Corporation. Ethernet networks operate at 10Mbps using CSMA/CD to run over cabling. Fast Ethernet 100Mbps technology based on the Ethernet/CD network access method. Flow Control (IEEE 802.3z) A means of holding packets back at the transmit port of the connected end station. Prevents packet loss at a congested switch port. forwarding The process of sending a packet toward its destination by an internetworking device. full duplex A system that allows packets to be transmitted and received at the same time and, in effect, doubles the potential throughput of a link. half duplex A system that allows packets to be transmitted and received, but not at the same time. Contrast with full duplex. IP address Internet Protocol address. A unique identifier for a device attached to a network using TCP/IP. The address is written as four octets separated with full-stops (periods), and is made up of a network section, an optional subnet section, and a host section. IPX Internetwork Packet Exchange. A protocol allowing communication in a NetWare network. LAN Local Area Network. A network of connected computing resources (such as PCs, printers, servers) covering a relatively small geographic area (usually not larger than a floor or building). Characterized by high data rates and low error rates. 13

D-Link DGS -1008D Unmanaged Gigabit Ethernet Switch latency The delay between the time a device receives a packet and the time the packet is forwarded out of the destination port. line speed See baud rate. main port The port in a resilient link that carries data traffic in normal operating conditions. MDI Medium Dependent Interface. An Ethernet port con nection where the transmitter of one device is connected to the receiver of another device. MDI-X Medium Dependent Interface Cross-over. An Ethernet port connection, where the internal transmit and receive lines are crossed. MIB Management Information Base. Stores a devices management characteristics and parameters. MIBs are used by the Simple Network Management Protocol (SNMP) to contain attributes of their managed systems. The Switch contains its own internal MIB. multicast Single packets copied to a specific subset of network addresses. These addresses are specified in the destination-address field of the packet. protocol A set of rules for communication between devices on a network. The rules dictate format, timing, sequencing, and error control. resilient link A pair of ports that can be configured so that one will take over data transmission should the other fail. See also main port and standby port. RJ-45 Standard 8-wire connectors for IEEE 802.3 10BASE-T networks. RMON Remote Monitorin g. Subset of SNMP MIB II, which allows monitoring and management capabilities by addressing up to ten different groups of information. RPS Redundant Power System. A device that provides a backup source of power when connected to the Switch. server farm A cluster of servers in a centralized location serving a large user population. SLIP Serial Line Internet Protocol. A protocol that allows IP to run over a serial line connection. SNMP Simple Network Management Protocol. A protocol originally designed to be used in managing TCP/IP internets. SNMP is presently implemented on a wide range of computers and networking equipment and may be used to manage many aspects of network and end station operation. Spanning Tree Protocol (STP) A bridge -based system for providing fault tolerance on networks. STP works by allowing you to implement parallel paths for network traffic, and to ensure that redundant paths are disabled when the main paths are operational and enabled if the main paths fail. stack A group of network devices that are integrated to form a single logical device. standby port The port in a resilient link that will take over data transmission if the main port in the link fails. switch A device that filters, forwards, and floods packets based on the packets destination address. The Switch learns the addresses associated with each switch port and builds tables based on this information to be used for the switching decision. TCP/IP A layered set of communications protocols providing Telnet terminal emulation, FTP file transfer, and other services for communication among a wide range of computer equipment. Telnet A TCP/IP application protocol that provides virtual terminal service, letting a user log in to another computer system and access a host as if the user were connected directly to the host. TFTP Trivial File Transfer Protocol. Allows you to transfer files (such as software upgrades) from a remote device using your switchs local management capabilities. UDP User Datagram Protocol. An Internet standard protocol that allows an application program on one device to send a datagram to an application program on another device. VLAN Virtual LAN. A group of location - and topology -independent devices that communicate as if they are on a comm on physical LAN. VLT Virtual LAN Trunk. A Switch-t o-Switch link which carries traffic for all the VLANs on each Switch. VT100 A type of terminal, which uses ASCII characters. VT100 screens have a text -based appearance.

Subject to the termsand conditions set forth herein, D -Link Systems, Inc. (D-Link) provides this Limited Warranty: Only to the person or entity that originally purchased the product from D-Link or its authorized reseller or distributor, and Only for products purchased and delivered within the fifty states of the United States, the District of Columbia, U.S. Possessions or Protectorates, U.S. Military Installations, or addresses with an APO or FPO.
Limited Warranty: D-Link warrants that the hardware portion of the D-Link product described below (Hardware) will be free from material defects in workmanship and materials under normal use from the date of original retail purchase of the product, for the period set forth below (Warranty Period), except as otherwise stated herein. Hardware (excluding power supplies and fans): Five (5) Years Power supplies and fans: One (1) Year Spare parts and spare kits: Ninety (90) days
The customer's sole and exclusive remedy and the entire liability of D-Link and its suppliers under this Limited Warranty will be, at D-Links option, to repair or replace the defective Hardware during the Warranty Period at no charge to the original owner or to refund the actual purchase price paid. Any repair or replacement will be rendered by D -Link at an Authorized D-Link Service Office. The replacement hardware need not be new or have an identical make, model or part. D-Link may, at its option, replace the defective Hardware or any part thereof with any reconditioned product that D-Link reasonably determines is substantially equivalent (or superior) in all material respects to the defective Hardware. Repaired or replacement hardware will be warranted for the remainder of the original Warranty Period or ninety (90) days, whichever is longer, and is s ubject to the same limitations and exclusions If a material defect is incapable of correction, or if D. Link determines that it is not practical to repair or replace the defective Hardware, the actual price paid by the original purchaser for the defective Hardware will be refunded by D -Link upon return to D -Link of the defective Hardware. All Hardware or part thereof that is replaced by D -Link, or for which the purchase price is refunded, shall become the property of D -Link upon replacement or refund. Limited Software Warranty: D-Link warrants that the software portion of the product (Software) will substantially conform to D-Links then current functional specifications for the Software, as set forth in the applicable documentation, from the date of original retail purchase of the Software for a period of ninety (90) days (Software Warranty Period), provided that the Software is properly installed on approved hardware and operated as contemplated in its documentation. D -Link further warrants that, during the Software Warranty Period, the magnetic media on which D-Link delivers the Software will be free of physical defects. The customer's sole and exclusive remedy and the entire liability of D-Link and its suppliers under this Limited Warranty will be, at D-Links option, to replace the non-conforming Software (or defective media) with software that substantially conforms to D -Links functional specifications for the Software or to refund the portion of the actual purchase price paid that is attributable to the Software. Except as otherwise agreed by D -Link in writing, the replacement Software is provided only to the original licensee, and is subject to the terms and conditions of the license granted by D -Link for the Software. Replacement Software will be warranted for the remainder of the original Warranty Period and is subject to the same limitations and exclusions. If a material non-conformance is incapable of correction, or if D-Link determines in its sole discretion that it is not practical to replace the non-conforming Software, the price paid by the original licensee for the non-conforming Software will be refunded by D -Link; provided that the non-conforming Software (and all copies thereof) is first returned to D-Link. The license granted res pecting any Software for which a refund is given automatically terminates. Non-Applicability of Warranty: The Limited Warranty provided hereunder for Hardware and Software portions of D-Link's products will not be applied to and does not cover any refurbished product and any product purchased through the inventory clearance or liquidation sale or other sales in which D-Link, the sellers, or the liquidators expressly disclaim their warranty obligation pertaining to the product and in that case, the product is being sold "As-Is" without any warranty whatsoever including, without limitation, the Limited Warranty as described herein, notwithstanding anything stated herein to the contrary. Submitting A Claim: The customer shall return the product to the original purchase point based on its return policy. In case the return policy period has expired and the product is within warranty, the customer shall submit a claim to D -Link as outlined below:

The customer must submit with the product as part of the cl aim a written description of the Hardware defect or Software nonconformance in sufficient detail to allow D -Link to confirm the same, along with proof of purchase of the product ( such as a copy of the dated purchase invoice for the product) if the product is not registered. The customer must obtain a Case ID Number from D -Link Technical Support at 1-877-453-5465, who will attempt to assist the customer in resolving any suspected defects with the product. If the product is considered defective, the customer must obtain a Return Material Authorization (RMA) number by completing the RMA form and entering the assigned Case ID Number at https://rma.dlink.com/. After an RMA number is issued, the defective product must be packaged securely in the original or other suitable shipping package to ensure that it will not be damaged in transit, and the RMA number must be prominently marked on the outside of the package. Do not include any manuals or accessories in the shipping p ackage. D -Link will only replace the defective portion of the product and will not ship back any accessories. The customer is responsible for all in-bound shipping charges to D-Link. No Cash on Delivery (COD) is allowed. Products sent COD will either be rejected by D -Link or become the property of D-Link. Products shall be fully insured by the customer and shipped to D-Link Systems, Inc., 17595 Mt. Herrmann, Fountain Valley, CA 92708. D-Link will not be held responsible for any packages that are lost in transit to D -Link. The repaired or replaced packages will be shipped to the customer via UPS Ground or any common carrier selected by D -Link. Return shipping charges shall be prepaid by D -Link if you use an address in the United States, otherwise we will ship the product to you freight collect. Expedited shipping is available upon request and provided shipping charges are prepaid by the customer.
D-Link may reject or return any product that is not packaged and shipped in strict compliance with the foregoing requirements, or for which an RMA number is not visible from the outside of the package. The product owner agrees to pay D -Links reasonable handling and return shipping charges for any product that is not packaged and shipped in accordance with the foregoing requirements, or that is determined by D-Link not to be defective or non-conforming.
What Is Not Covered: The Limited Warranty provided herein by D-Link does not cover: Products that, in D-Links judgment, have been subjected to abuse, accident, alteration, modification, tampering, negligence, misuse, faulty installation, lack of reasonable care, repair or service in any way that is not contemplated in the documentation for the product, or if the model or serial number has been altered, tampered with, defaced or removed; Initial installation, installation and removal of the product for repair, and shipping costs; Operational adjustments covered in the operating manual for the product, and normal maintenance; Damage that occurs in shipment, due to act of God, failures due to power surge, and cosmetic damage; Any hardware, software, firmware or other products or services provided by anyone other than D-Link; and Products that have been purchased from inventory clearance or liquidation sales or other sales in which D-Link, the sellers, or the liquidators expressly disclaim their warranty obligation pertaining to the product. While necessary maintenance or repairs on your Product can be performed by any company, we recommend that you use only an Authorized D -Link Service Office. Improper or incorrectly performed maintenance or repair voids this Limited Warranty. Disclaimer of Other Warranties: EXCEPT FOR THE LIMITED WARRANTY SPECIFIED HEREIN, THE PRODUCT IS PROVIDED ASIS WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON -INFRINGEMENT. IF ANY IMPLIED WARRANTY CANNOT BE DISCLAIMED IN ANY TERRITORY WHERE A PRODUCT IS SOLD, THE DURATION OF SUCH IMPLIED WARRANTY SHALL BE LIMITED TO THE DURATION OF THE APPLICABLE WARRANTY PERIOD SET FORTH ABOVE. EXCEPT AS EXPRESSLY COVERED UNDER THE LIMITED WARRANTY PROVIDED HEREIN, THE ENTIRE RISK AS TO THE QUALITY, SELECTION AND PERFORMANCE OF THE PRODUCT IS WITH THE PURC HASER OF THE PRODUCT. Limitation of Liability: TO THE MAXIMUM EXTENT PERMITTED BY LAW, D -LINK IS NOT LIABLE UNDER ANY CONTRACT, NEGLIGENCE, STRICT LIABILITY OR OTHER LEGAL OR EQUITABLE THEORY FOR ANY LOSS OF USE OF THE PRODUCT, INCONVENIENCE OR DAMAGES OF ANY CHARACTER, WHETHER DIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL (INCLUDING, BUT NOT LIMITED TO, DAMAGES FOR LOSS OF GOODWILL, LOSS OF REVENUE OR PROFIT, WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, FAILURE OF OTHER EQUIPMENT OR COMPUTER PROGRAMS TO WHICH D -LINKS PRODUCT IS CONNECTED WITH, LOSS OF INFORMATION OR DATA CONTAINED IN, STORED ON, OR INTEGRATED WITH ANY PRODUCT RETURNED TO D -LINK FOR WARRANTY SERVICE) RESULTING FROM THE USE OF THE PRODUCT, RELATING TO WARRANTY SERVICE, OR ARISING OUT OF ANY BREACH OF THIS LIMITED WARRANTY, EVEN IF D -LINK HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE SOLE REMEDY FOR A BREACH OF THE FOREGOING LIMITED WARRANTY IS REPAIR, REPLACEMENT OR REFUND OF THE DEFECTIVE OR NON -CONFORMING PRODUCT. THE MAXIMUM LIABILITY OF D LINK UNDER THIS WARRANTY IS LIMITED TO THE PURCHASE PRICE OF THE PRODUCT COVERED BY THE WARRANTY. THE FOREGOING EXPRESS WRITTEN WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ANY OTHER WARRANTIES OR REMEDIES, EXPRESS, IMPLIED OR STATUTORY. Governing Law: This Limited Warranty shall be governed by the laws of the State of California. Some states do not allow exclusion or limitation of incidental or consequential damages, or limitations on how long an implied warranty lasts, so the foregoing limitations and exclusions may not apply. This Limited Warranty provides specific legal rights and you may also have other rights which vary from state to state. Trademarks: D-Link is a registered trademark of D-Link Systems, Inc. Other trademarks or registered trademarks are the property of their respective owners.

Registration Card

(All Countries and Regions excluding USA)
Print, type or use block letters. Your name: Mr./Ms______________________________________________________________________ Organization: ________________________________________ Dept.______________________________ Your title at organization:_________________ Telephone:_____________________ Fax:___________ Organization's full address:_______________________________________________________________ Country:______________________________________________________________________________ Date of purchase (Month/Day/Year):_________________________________________________________

Product Model

Product Serial No.
* Product installed in type of computer (e.g., Compaq 486)
* Product installed in computer serial No.
(* Applies to adapters only) Product was purchased from: Reseller's name:______________________________________________________________________________ Telephone:________________________________ Fax:______________________________________________ Reseller's full address:_________________________________________________________________________ ___________________________________________________________________________________________ Answers to the following questions help us to support your product: 1. Where and how will the product primarily be used? oHome oOffice oTra vel oCompany Business oHome Business oPersonal Use 2. How many employees work at installation site? o1 employee o2-9 o10-49 o50-99 o100-499 o500-999 o1000 or more 3. What network protocol(s) does your organization use ? oXNS/IPX oTCP/IP oDECnet oOthers__________________________________________________________ 4. What network operating system(s) does your organization use ? oD-Link LANsmart oNovell NetWare oNetWare Lite oSCO Unix/Xenix oPC NFS o3Com 3+Open oBanyan Vines oDECnet Pathwork oWindows NT oWindows 2000 oWindows XP oOthers___________________________________________________________________________________ 5. What network management program does your organization use ? oD-View oHP OpenView/Windows oHP OpenView/Unix oSunNet Manager oNovell NMS oNetView 6000 oOthers______________________________________________________________________ 6. What network medium/media does your organization use ? oFiber-optics oThick coax Ethernet oThin coax Ethernet o10BASE-T UTP/STP o100BASE-TX o100BASE-T4 o100VGAnyLAN oOthers____________________________________________ 7. What applications are used on your network? oDesktop publishing oSpreadsheet oWord processing oCAD/CAM oDatabase management oAccounting oOthers_____________________________________________________________________________________ 8. What category best describes your company? oAerospace oEngineering oEducation oFinance oHospital oLegal oInsurance/Real Estate oManufacturing oRetail/Chainstore/Wholesale oGovernment oTransportation/Utilities/Communication oVAR oSystem house/company oOther_________________________________________________________________________ 9. Would you recommend your D-Link product to a friend? oYes oNo oDon't know yet 10.Your comments on this product? _____________________________________________________________ ___________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________ _______________________________________________________________

Business and Enterprise Solutions

DGS-1008D

Layer 2 Switch
Unmanaged 8-Port 10/100/1000BASE-T
Get the blazing speed of Gigabit Ethernet with the D-Link GigaExpressTM DGS-1008D, an 8-port 10/100/1000Mbps Switch that delivers power, performance, and reliability in one cost-effective, space-saving design. Increase the speed of your network server and backbone connections, or make Gigabit to the desktop a reality. Power users in the home, office, workgroup, or creative production environment can now move large, bandwidth-intensive files faster. Transfer graphics, CGI, CAD, or multimedia files across the network instantly. Power-Packed It features a non-blocking switching architecture that filters and forwards packets at full wire-speed for maximum throughput. An 8,000 MAC address table provides scalability for even the largest networks. Address learning and aging, 802.3x Flow Control for full duplex mode, and back pressure flow control for half-duplex mode alleviates traffic congestion and ensures reliable data transmission. Designed using industry standards, it is compatible with virtually all 10, 100, and 1000Mbps Ethernet devices and other vendor equipment. It protects your existing network investments while providing you with a straightforward migration path to faster Gigabit speeds. Easy to Use The auto features of this switch make installation plug and play and hassle-free. No configuring is required. Auto MDI/MDI-X crossover on all ports eliminate the need for crossover cables or uplink ports. Auto-negotiation on each port senses the link speed of a network device (either 10, 100, or 1000 Mbps) and intelligently adjusts for compatibility and optimal performance. It also features diagnostic LEDs which display status and activity, allowing you to quickly detect and correct problems on the network.
High Performance Wire-Speed Architecture:
-16Gbps Switching Capacity -Non-Blocking Architecture -8,000 MAC Address Table

Operational Simplicity:

-True Plug & Play -Auto-Sensing -Auto Cable Detection -Auto-Configuration -Clear, At A Glance Per Port LEDs Indicators -Desktop Or Wall-Mount Design

Investment Protection:

-Support for Industry Standards -Free 24/7 Technical Support -5-Year Product Warranty -3-Year Warranty On Power Supply and Fans
Unmanaged (8) Port 10/100/1000Mbps High Performance 16Gbps Non-Blocking Switch Fabric

Technical Specifications

Product/Performance Specifications
DGS-1008D MAC Address Table Size Switch Fabric Transmission Method Diagnostic LEDs Packet Buffer Memory Forwarding Rate Address Aging Timer Max Power Consumption (8) Ports 10/100/1000Mbps 8,000 16Gbps Forwarding Capacity Store-and-forward Per Unit: Power Per Port: Activity/Link On Chip 256KByte Buffer Memory Per Device 10Mbps-14,880pps/100Mbps-148,810pps/1000Mbps-1,488,100pps Automatic Update 11 Watts (Max)

Interface Options

RJ-45 10BASE-T, 100BASE-TX & 1000BASE-T Universal UTP Cable Recognition for Straight-Through or Crossover Cables (MDI/MDI-X)
Network Protocol and Standards
IEEE 802.3 Ethernet, 802.3u Fast Ethernet, 802.3x Flow Control & 802.3ab Gigabit Ethernet

Electrical & Electrical Emissions Summary
Emissions Power Supply CE Mark A, FCC Class A, VCCI Class A DC Input: 5V 2.5A
Safety Agency Certifications and Environmental
Safety Temperature Storage Humidity CUL(60950) and LVD(60950) Operating: 0 - 55 C (32 - 131 F) -10 - 70 C (14 - 158 F) Operating: 5% to 95% RH & NC

Physical Specifications

Dimensions (W x D x H) 9.25 x 6.37 x 1.4 inches
Warranty and Support Information
Warranty Support Limited 5-Year Warranty for as long as the original customer/end user owns the product, (excluding power supplies and fans). Power supplies and fans carry a limited 3-year warranty. Free 24/7 Technical Support

Ordering Information

Part Number DGS-1008D Description Unmanaged Layer 2 Switch with (8) 10/100/1000BASE-T Ports
D-Link Systems, Inc. 53 Discovery Drive Irvine CA 92618 www.dlink.com Copyright D-Link Systems, Inc. 2003. All rights reserved. D-Link is a registered trademark of D-Link Systems, Inc. Other trademarks or registered trademarks are the property of their respective manufacturers or owners. Price and specifications are subject to changes without notice. See web site or user manual for warranty details.