July, Figure 1. Intuitive, user-friendly web-based (HTML) interface.

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The Value-Oriented Alternative for Managed Switching

White Paper

September, 2005

Abstract

This White Paper provides a short introduction to Web Smart switches and their importance in a local area network (LAN). It explains the

This White Paper provides a short introduction to Web Smart switches and their importance in a local area network (LAN). It explains the basic concepts behind we-based switch technology, provides an overview of the product benefi ts, and details the network applications for basic concepts behind we-based switch technology, provides an overview of the product benefi ts, and details the network applications for web-based switches.

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Introduction to Web-based Smart Switches

IT managers and staff face many challenges associated with today’s

IT managers and staff face many challenges associated with today’s local area network (LAN), which has become a vital business local area network (LAN), which has become a vital business resource in today’s competitive marketplace. The traffi c of a LAN resource in today’s competitive marketplace. The traffi c of a LAN requires constant monitoring and management. However, with requires constant monitoring and management. However, with today’s networks carrying more and more business-critical traffi c today’s networks carrying more and more business-critical traffi c such as VoIP, CRM, and video, and with many different types of such as VoIP, CRM, and video, and with many different types of applications sharing the same data links, organizations need to applications sharing the same data links, organizations need to ensure that business-critical applications are not crowded-out by ensure that business-critical applications are not crowded-out by other high-bandwidth applications. When business traffi c is left other high-bandwidth applications. When business traffi c is left unmanaged, the performance of important, interactive or unmanaged, the performance of important, interactive or delay-sensitive applications can dramatically degrade, resulting in lost sensitive applications can dramatically degrade, resulting in lost productivity and revenues as well as employee and customer productivity and revenues as well as employee and customer frustration. And business growth, while generally desirable, imposes frustration. And business growth, while generally desirable, imposes burdens that can diminish network performance. burdens that can diminish network performance. Performance-robbing burdens include rapid growth in the number of network robbing burdens include rapid growth in the number of network users or clients, higher traffi c volume generated by each client, users or clients, higher traffi c volume generated by each client, increasing application complexity and larger fi le sizes.

increasing application complexity and larger fi le sizes.

Because of these growing network demands, IT managers face the Because of these growing network demands, IT managers face the challenges of having to boost bandwidth and uptime while keeping challenges of having to boost bandwidth and uptime while keeping within tight budget constraints. Cost and downtime considerations within tight budget constraints. Cost and downtime considerations often rule out massive upgrades to network infrastructure. Such often rule out massive upgrades to network infrastructure. Such upgrades may be overkill depending on the order-of-magnitude upgrades may be overkill depending on the order-of-magnitude of increase capacity involved. At the same time, doing nothing of increase capacity involved. At the same time, doing nothing may not be an option either, since existing infrastructure may may not be an option either, since existing infrastructure may not scale to meet bandwidth requirements. Because of greater not scale to meet bandwidth requirements. Because of greater network demands, more companies require sophisticated traffi network demands, more companies require sophisticated traffi c-management features in their high-speed switches.

management features in their high-speed switches.

In today’s world, technology managers are asking for more out of In today’s world, technology managers are asking for more out of high-speed switches than just speed and switching. The growing high-speed switches than just speed and switching. The growing demands of a sophisticated business IT environment, with complex, demands of a sophisticated business IT environment, with complex, high traffi c, database-driven networks, require that highspeed high traffi c, database-driven networks, require that highspeed switches also offer network management. As demands have switches also offer network management. As demands have increased, vendors have responded with switches that offer a host increased, vendors have responded with switches that offer a host of switch management features and capabilities. In addition to the of switch management features and capabilities. In addition to the “unmanaged” and “managed” switch categories in the market, a “unmanaged” and “managed” switch categories in the market, a third switch category type has emerged and grown in popularity in third switch category type has emerged and grown in popularity in recent years—Web-based Smart Switches.

recent years—Web-based Smart Switches.

A web smart switch or web-based switch is a network switch A web smart switch or web-based switch is a network switch that can be managed through a web-based interface (or GUI) and that can be managed through a web-based interface (or GUI) and provides many of the benefi ts of a managed switch, but without the provides many of the benefi ts of a managed switch, but without the complexity or cost of a fully managed switch. A web smart switch complexity or cost of a fully managed switch. A web smart switch has more capability than an unmanaged switch, but not all that has more capability than an unmanaged switch, but not all that of a fully managed switch. They typically offer important switch of a fully managed switch. They typically offer important switch features such as VLANs (virtual LAN), Quality of Service (QoS), link features such as VLANs (virtual LAN), Quality of Service (QoS), link aggregation (port trunking), and port mirroring. Adding management aggregation (port trunking), and port mirroring. Adding management capabilities like these to a network switch optimizes confi guration capabilities like these to a network switch optimizes confi guration

and performance, and can help diagnose problems. Web smart and performance, and can help diagnose problems. Web smart switches do not typically include features such as IP Multicasting, switches do not typically include features such as IP Multicasting, Access Control Lists, RMON, 802.1x, SSH, SSL, TACACS, rate Access Control Lists, RMON, 802.1x, SSH, SSL, TACACS, rate limiting, and others found in a fully managed switch. The benefi ts limiting, and others found in a fully managed switch. The benefi ts provided in a typical web-based switch include traffi c prioritization, provided in a typical web-based switch include traffi c prioritization, network segmentation, redundant network links, network

network segmentation, redundant network links, network monitoring, and remote management.

monitoring, and remote management.

All software functions of web-based smart switches can be All software functions of web-based smart switches can be managed, confi gured, and monitored using the embedded managed, confi gured, and monitored using the embedded web-based (HTML) interface, and can be managed from remote stations based (HTML) interface, and can be managed from remote stations anywhere on the network through a standard browser (such as anywhere on the network through a standard browser (such as Netscape Navigator/Communicator or Microsoft Internet Explorer). Netscape Navigator/Communicator or Microsoft Internet Explorer). The browser acts as a universal access tool and can communicate The browser acts as a universal access tool and can communicate directly with the switch using the HTTP protocol.

directly with the switch using the HTTP protocol.

Why are web-based smart switches becoming so important to Why are web-based smart switches becoming so important to Ethernet networks? The benefi ts of web smart switches are Ethernet networks? The benefi ts of web smart switches are numerous from both a network effi ciency and cost standpoint. Any numerous from both a network effi ciency and cost standpoint. Any organization, regardless of size, can enjoy the benefi ts of integrating organization, regardless of size, can enjoy the benefi ts of integrating web smart switches into their network.

web smart switches into their network.

Benefi ts of Web Smart Switches

Web-based Smart switches offer a number of benefi ts:

Cost-Effective Managed Switch Solution Cost-Effective Managed Switch Solution

When compared to a fully managed switch in the market, When compared to a fully managed switch in the market, web-based smart switches have several cost advantages. A web-web-based based smart switches have several cost advantages. A web-based smart switch provides many of the same advanced features of a smart switch provides many of the same advanced features of a

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fully managed switch, but offers a price that is closer to that of an

fully managed switch, but offers a price that is closer to that of an unmanaged switch. With widespread deployment of many units over unmanaged switch. With widespread deployment of many units over several locations, the cost savings increases dramatically.

several locations, the cost savings increases dramatically.

Web-based smart switches also save businesses money through a Web-based smart switches also save businesses money through a lower total cost of ownership (TCO) and faster return on investment lower total cost of ownership (TCO) and faster return on investment (ROI). Because web-based switches are easier to confi gure and (ROI). Because web-based switches are easier to confi gure and operate than managed switches, the cost of training staff and operate than managed switches, the cost of training staff and deployment time is dramatically reduced, saving a company a deployment time is dramatically reduced, saving a company a signifi cant amount costs.

signifi cant amount costs.

Additionally, as a company grows and requires the network to scale, Additionally, as a company grows and requires the network to scale, key switch features supported by web-based smart switches help to key switch features supported by web-based smart switches help to protect and future-proof a company’s network investment. A protect and future-proof a company’s network investment. A web-based smart switch can operate as an unmanaged switch out of the based smart switch can operate as an unmanaged switch out of the box. But key features such as link aggregation, QoS, and network box. But key features such as link aggregation, QoS, and network monitoring supported by web smart switches enable a company to monitoring supported by web smart switches enable a company to scale and grow without having replace their switches or perform a scale and grow without having replace their switches or perform a “forklift” upgrade.

“forklift” upgrade.

Easy Switch Management Through a Web-based Interface Easy Switch Management Through a Web-based Interface

Tightened budgets in small and medium-sized businesses Tightened budgets in small and medium-sized businesses sometimes leave the responsibility of network administration to sometimes leave the responsibility of network administration to untrained personnel. In many cases the owner or untrained staff end untrained personnel. In many cases the owner or untrained staff end up having to manage the local network themselves. Having a up having to manage the local network themselves. Having a web-based interface makes confi guring and deploying web-web-based smart based interface makes confi guring and deploying web-based smart switches simple and easy. Instead of a command prompt, where switches simple and easy. Instead of a command prompt, where confi guration requires memorization of switch commands, all confi guration requires memorization of switch commands, all software functions of web-based smart switches can be managed, software functions of web-based smart switches can be managed, confi gured, and monitored using the embedded web-based (HTML) confi gured, and monitored using the embedded web-based (HTML) interface. In addition, management can be performed from remote interface. In addition, management can be performed from remote

stations anywhere through a standard browser. stations anywhere through a standard browser.

Simple Point and Click Troubleshooting Simple Point and Click Troubleshooting

Management features in a web-based switch isolate and track Management features in a web-based switch isolate and track problems in the network. Packet errors, faulty transmissions, port problems in the network. Packet errors, faulty transmissions, port status, and traffi c congestion can affect all users. Support for a Web status, and traffi c congestion can affect all users. Support for a Web Management Utility means these switches can alert an administrator Management Utility means these switches can alert an administrator of trouble, to either local or remote locations. Web-based Smart of trouble, to either local or remote locations. Web-based Smart switches help keep small problems from becoming larger ones. switches help keep small problems from becoming larger ones.

Network Segmentation For Improved Network Performance Network Segmentation For Improved Network Performance and Security

and Security

Web Smart switches support VLANs. Implementing VLANs can Web Smart switches support VLANs. Implementing VLANs can provide network segmentation to improve network performance. provide network segmentation to improve network performance. VLANs can be confi gured for a single switch, or for multiple VLANs can be confi gured for a single switch, or for multiple switches. VLANs can be used to control traffi c fl ow and ease the switches. VLANs can be used to control traffi c fl ow and ease the administration of moves, adds, and changes on the network, by administration of moves, adds, and changes on the network, by eliminating the need to change physical cabling.

eliminating the need to change physical cabling.

End nodes that frequently communicate with each other are End nodes that frequently communicate with each other are assigned to the same VLAN, regardless of their physical location assigned to the same VLAN, regardless of their physical location on the network. Logically, a VLAN can be equated to a broadcast on the network. Logically, a VLAN can be equated to a broadcast domain, because broadcast packets are forwarded to only members domain, because broadcast packets are forwarded to only members of the VLAN on which the broadcast was initiated. The primary utility of the VLAN on which the broadcast was initiated. The primary utility of using VLANs is to reduce latency, using faster switching instead. of using VLANs is to reduce latency, using faster switching instead.

Security:

Security: Security is also improved with the reduction of opportunity Security is also improved with the reduction of opportunity

in eavesdropping on a broadcast network because data will be in eavesdropping on a broadcast network because data will be switched to only those confi dential users within the VLAN. switched to only those confi dential users within the VLAN.

Cost Reduction:

Cost Reduction: A VLAN can be used to create multiple broadcast A VLAN can be used to create multiple broadcast domains, thus eliminating the need of expensive routers.

domains, thus eliminating the need of expensive routers.

Figure 2. Sample port settings interface of a web smart switch.

Figure 3. Security is enhanced because no traffi c can be passed or accessed between ports not belonging to

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802.1Q VLAN:

802.1Q VLAN: The VLAN tagging option is a standard set by the The VLAN tagging option is a standard set by the IEEE to facilitate the spanning of VLANs across multiple switches. IEEE to facilitate the spanning of VLANs across multiple switches. (Reference: IEEE Std 802.1Q-1998 Virtual Bridged Local Area (Reference: IEEE Std 802.1Q-1998 Virtual Bridged Local Area Networks.) Standards-based support of 802.1Q VLANs means that Networks.) Standards-based support of 802.1Q VLANs means that a switch will interoperate with other vendor’s switches in a a switch will interoperate with other vendor’s switches in a multi-vendor environment.

vendor environment.

Prioritize Delay-Sensitive Network Traffi c Prioritize Delay-Sensitive Network Traffi c

Network problems may cause loss, delay, or misdirection of traffi c. Network problems may cause loss, delay, or misdirection of traffi c. Quality of Service (QoS) is a key component for today’s networks Quality of Service (QoS) is a key component for today’s networks and web smart switches can provide it to any size business. QoS and web smart switches can provide it to any size business. QoS mechanisms help administrators solve the problems inherent in mechanisms help administrators solve the problems inherent in unpredictable network traffi c by classifying and prioritizing incoming unpredictable network traffi c by classifying and prioritizing incoming and outgoing packets. Using web smart switching hardware that and outgoing packets. Using web smart switching hardware that facilitates QoS, IT administrators can help maximize their switch facilitates QoS, IT administrators can help maximize their switch implementations, relieve network congestion, and better meet implementations, relieve network congestion, and better meet guaranteed minimum delays.

guaranteed minimum delays.

QoS allows managers to set priorities and decide, for example, that QoS allows managers to set priorities and decide, for example, that network traffi c involving voice or video should be given bandwidth network traffi c involving voice or video should be given bandwidth ahead of Internet traffi c. It allows managers to make value ahead of Internet traffi c. It allows managers to make value judgments about the importance of specifi c applications and the judgments about the importance of specifi c applications and the network traffi c they generate.

network traffi c they generate.

Given today’s high-end, wire-speed non-blocking managed Given today’s high-end, wire-speed non-blocking managed switches, prioritizing traffi c may no longer seem necessary. But switches, prioritizing traffi c may no longer seem necessary. But converged voice and data service—which requires guaranteed converged voice and data service—which requires guaranteed minimum delays and assured bandwidth—increases network minimum delays and assured bandwidth—increases network congestion even further. By implementing QoS, administrators can congestion even further. By implementing QoS, administrators can manage network congestion more effectively. Many companies are manage network congestion more effectively. Many companies are reluctant to invest in expensive managed switch equipment, but now reluctant to invest in expensive managed switch equipment, but now with the availability of web smart switches, IT administrators and with the availability of web smart switches, IT administrators and managers have a cost-effective alternative for network switching managers have a cost-effective alternative for network switching with QoS.

with QoS.

Higher Capacity Links for Higher Additional Bandwidth Higher Capacity Links for Higher Additional Bandwidth

What do you do when you are faced with having to boost bandwidth What do you do when you are faced with having to boost bandwidth and uptime while keeping within tight budget constraints? Cost and uptime while keeping within tight budget constraints? Cost and downtime considerations often rule out massive upgrades to and downtime considerations often rule out massive upgrades to network infrastructure. At the same time, doing nothing may not be network infrastructure. At the same time, doing nothing may not be a good option either, since existing infrastructure may not scale to a good option either, since existing infrastructure may not scale to meet bandwidth requirements. Link aggregation (or port trunking) meet bandwidth requirements. Link aggregation (or port trunking) helps address these challenges for additional bandwidth.

helps address these challenges for additional bandwidth. Link aggregation allows the network’s backbone speed to Link aggregation allows the network’s backbone speed to incrementally grow as demands on the network increase, without incrementally grow as demands on the network increase, without having to replace everything and buy all-new, more expensive having to replace everything and buy all-new, more expensive hardware. Link aggregation combines the datastream multiple hardware. Link aggregation combines the datastream multiple Ethernet ports into a single high-speed virtual link. Link aggregation Ethernet ports into a single high-speed virtual link. Link aggregation is most commonly used to link a bandwidth intensive network is most commonly used to link a bandwidth intensive network device or devices, such as a server or another switch, to the device or devices, such as a server or another switch, to the

backbone of a network. backbone of a network.

The link aggregation also provides inherent, automatic redundancy The link aggregation also provides inherent, automatic redundancy on point-topoint links. Should one of the multiple ports used in a on point-topoint links. Should one of the multiple ports used in a link fail, network traffi c is dynamically redirected to fl ow across the link fail, network traffi c is dynamically redirected to fl ow across the remaining good ports in the link. The redirection is fast and triggered remaining good ports in the link. The redirection is fast and triggered when a switch learns that a media access control address has been when a switch learns that a media access control address has been automatically reassigned from one link port to another in the same automatically reassigned from one link port to another in the same link. The switch then sends the data to the new port location, and link. The switch then sends the data to the new port location, and the network continues to operate with virtually no interruption in the network continues to operate with virtually no interruption in service.

service.

Monitor Network Traffi c with Port Mirroring Monitor Network Traffi c with Port Mirroring

Port Mirroring is a method of monitoring network traffi c that Port Mirroring is a method of monitoring network traffi c that forwards a copy of each incoming and/or outgoing packet from forwards a copy of each incoming and/or outgoing packet from one port of a network switch to another port where the packet can one port of a network switch to another port where the packet can be studied. It enables the manager to keep close track of switch be studied. It enables the manager to keep close track of switch performance and alter it if necessary. You can attach a monitoring performance and alter it if necessary. You can attach a monitoring device to the mirrored port, such as a sniffer, to view details about device to the mirrored port, such as a sniffer, to view details about the packets passing through the fi rst port. This is useful for network the packets passing through the fi rst port. This is useful for network monitoring and troubleshooting purposes.

monitoring and troubleshooting purposes.

Deploying Network Smart Switches

Web Smart switches have grown signifi cantly in popularity and

Web Smart switches have grown signifi cantly in popularity and deployment in recent years because of the many clear benefi ts deployment in recent years because of the many clear benefi ts they offer. They are cost-effective alternatives to higher priced, fully they offer. They are cost-effective alternatives to higher priced, fully managed switches and are ideal for deployment in small business managed switches and are ideal for deployment in small business networks, branch offi ces, or wiring closets. Following are some networks, branch offi ces, or wiring closets. Following are some applications that benefi t most from the use of web smart switches. applications that benefi t most from the use of web smart switches.

Voice over IP (VoIP) Deployments Voice over IP (VoIP) Deployments

When adding VoIP to IP networks, more predictable and guaranteed When adding VoIP to IP networks, more predictable and guaranteed IP service is required. Given the sensitivity of voice traffi c to IP service is required. Given the sensitivity of voice traffi c to latency and loss, it is very desirable to give voice traffi c priority latency and loss, it is very desirable to give voice traffi c priority over data traffi c. VoIP requires advanced bandwidth management over data traffi c. VoIP requires advanced bandwidth management for prioritizing other traffi c and guaranteeing bit rate for voice for prioritizing other traffi c and guaranteeing bit rate for voice connections.

connections.

A typical network environment carries a broad mix of data traffi c. A typical network environment carries a broad mix of data traffi c. This includes bursty data applications, such as e-mail and the web, This includes bursty data applications, such as e-mail and the web, with streaming real-time applications such as voice. VoIP demands with streaming real-time applications such as voice. VoIP demands consistent bandwidth allocation and minimal delays while data consistent bandwidth allocation and minimal delays while data applications have variable and unpredictable bandwidth applications have variable and unpredictable bandwidth

requirements. Thus, a QoS system that enables VoIP optimization is requirements. Thus, a QoS system that enables VoIP optimization is needed.

needed.

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Consider the example in the diagram below. In this scenario, voice

Consider the example in the diagram below. In this scenario, voice traffi c travels over the same network as data traffi c, with the latter traffi c travels over the same network as data traffi c, with the latter consuming the majority of bandwidth. The lack of prioritization for consuming the majority of bandwidth. The lack of prioritization for voice traffi c can result in degraded or unusable telephony service for voice traffi c can result in degraded or unusable telephony service for endpoints such as IP phones. Implementing 802.1p QoS prioritization endpoints such as IP phones. Implementing 802.1p QoS prioritization by using web-based smart switches addresses the problem of traffi c by using web-based smart switches addresses the problem of traffi c latency and loss, giving higher priority to delay-sensitive voice latency and loss, giving higher priority to delay-sensitive voice traffi c.

traffi c.

Why not implement a fully managed switch instead of a web Why not implement a fully managed switch instead of a web smart switch? In many network applications, implementing a fully smart switch? In many network applications, implementing a fully managed switch—with support for additional features such as IP managed switch—with support for additional features such as IP multicasting, Access Control List, 802.1x, SSH, SSL, TACACS, and multicasting, Access Control List, 802.1x, SSH, SSL, TACACS, and other features—may not be cost-effective and may actually other features—may not be cost-effective and may actually be an overkill. After assessing budgetary and network design be an overkill. After assessing budgetary and network design requirements, a web smart switch may be more than suffi cient for a requirements, a web smart switch may be more than suffi cient for a particular network application.

particular network application.

Higher Bandwidth Server Applications Higher Bandwidth Server Applications

Company networks typically connect large numbers of users with Company networks typically connect large numbers of users with one another and with server farms over a backbone such as Gigabit one another and with server farms over a backbone such as Gigabit Ethernet. As the company grows, two things become increasingly Ethernet. As the company grows, two things become increasingly likely. As the number of users grows, so too does the likelihood of likely. As the number of users grows, so too does the likelihood of backbone saturation. A tenfold increase in backbone capacity would backbone saturation. A tenfold increase in backbone capacity would provide more than enough bandwidth, but also would require the provide more than enough bandwidth, but also would require the replacement of some equipment. In many cases, simply doubling replacement of some equipment. In many cases, simply doubling backbone capacity would provide suffi cient capacity, and allow the backbone capacity would provide suffi cient capacity, and allow the

use of current hardware. use of current hardware.

Link aggregation is an inexpensive way to set up a high-speed Link aggregation is an inexpensive way to set up a high-speed network backbone that transfers much more data than any one network backbone that transfers much more data than any one single port or device can utilize. By aggregating two links between single port or device can utilize. By aggregating two links between each of the switches in the core of the network, we can double each of the switches in the core of the network, we can double network capacity with no additional hardware.

network capacity with no additional hardware.

Link aggregation is not just for the core switching equipment. Link aggregation is not just for the core switching equipment. Network interface cards (NICs) can also sometimes be trunked Network interface cards (NICs) can also sometimes be trunked together to form network links, beyond the speed of any one single together to form network links, beyond the speed of any one single NIC. For example, this allows a central, high-end server to establish NIC. For example, this allows a central, high-end server to establish a 2-gigabit connection using two 1-gigabit NICs trunked together. a 2-gigabit connection using two 1-gigabit NICs trunked together. High-end servers today can saturate a single Gigabit Ethernet link, High-end servers today can saturate a single Gigabit Ethernet link, but are not quite up to 2-Gbit/s rates. The lowcost addition of a but are not quite up to 2-Gbit/s rates. The lowcost addition of a second Gigabit Ethernet NIC, along with link aggregation support in second Gigabit Ethernet NIC, along with link aggregation support in the NIC driver, provides twice the bandwidth as well as redundancy. the NIC driver, provides twice the bandwidth as well as redundancy.

If one NIC fails or a cable is cut, traffi c automatically moves across If one NIC fails or a cable is cut, traffi c automatically moves across to the remaining active link(s).

to the remaining active link(s).

Again, for this particular network server application, implementing Again, for this particular network server application, implementing a higher priced, fully managed switch may be cost prohibitive and a higher priced, fully managed switch may be cost prohibitive and excessive. Implementing a web smart switch may be more than excessive. Implementing a web smart switch may be more than enough.

enough.

Remote Management of Web Smart Switches Remote Management of Web Smart Switches

Web smart switches provide a built-in browser interface that lets Web smart switches provide a built-in browser interface that lets you confi gure and manage them remotely using a standard Web you confi gure and manage them remotely using a standard Web browser such as Microsoft Internet Explorer or Netscape Navigator. browser such as Microsoft Internet Explorer or Netscape Navigator. The web interface also allows for system monitoring of the switch. The web interface also allows for system monitoring of the switch. Some web smart switches also support a Web Management Utility, Some web smart switches also support a Web Management Utility, which can alert an administrator of trouble, to either local or remote which can alert an administrator of trouble, to either local or remote locations.

locations.

Figure 4. Voice traffi c is highly sensitive to latency and packet loss

Figure 5. Prioritization of delay sensitive traffi c using 802.1p.

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D-Link Web Smart Switch Solutions

DES-1316 DES-1316

Web Smart 16-Port 10/100 with

Web Smart 16-Port 10/100 with 8 PoE 802.3af ports Switch

8 PoE 802.3af ports Switch Web Smart 24-Port 10/100 + 2Web Smart 24-Port 10/100 + 2_{gig Switch}_{gig Switch}

DES-1250G

Web Smart 48-Port 10/100

Web Smart 48-Port 10/100 + 2 Gig Switch

+ 2 Gig Switch

Web Smart 16-Port Web Smart 16-Port 10/100/1000+2 combo 10/100/1000+2 combo SFP Switch SFP Switch DGS-1216T DGS-1216T

Web Smart 24-Port

Web Smart 24-Port 10/100/1000 + 2 combo 10/100/1000 + 2 combo SFP Switch SFP Switch DGS-1224T DGS-1224T DGS-1248T DGS-1248T

Web Smart 48-Port

Web Smart 48-Port 10/100/1000 + 4 combo 10/100/1000 + 4 combo SFP Switch SFP Switch DES-1226G DES-1226G

Prices and specifi cations are subject to change without notice. D-Link, the D-Link logo are trademarks or registered trademarks of D-Link Corporation or its subsidiaries in the United States and other countries. All other company or product names mentioned herein are trademarks or registered trademarks of their respective companies. Copyright © 2006 D-Link Corporation/D-Link Systems, Inc. www.dlink.com

DES-1228

Web Smart 24-Port 10/100

Web Smart 24-Port 10/100 + (4) 1000BASE-T Ports + + (4) 1000BASE-T Ports + 2 Combo Ports Switch 2 Combo Ports Switch

Web Smart 48-Port 10/100 + 2 Web Smart 48-Port 10/100 + 2 Combo GbE + (2) 1000BASE-T Combo GbE + (2) 1000BASE-T Ports Switch

Ports Switch

DES-1252

Web Smart 24-Port PoE 10/100

Web Smart 24-Port PoE 10/100 + (4) 1000BASE-T Ports + 2 + (4) 1000BASE-T Ports + 2 Combo Ports Switch Combo Ports Switch

DES-1228P