MODEL- DES-1252           VENDOR- D-LINK
   
FEATURES- Web-Smart Switch
       Web smart 48 port 10/100Mbps with 2 Combo Gigabit copper/SFP ports, 
         2 1000BASE-T uplinks!
       The DES-1252 Web Smart Switch from D-Link is a cost-effective 
        solution for the small and medium business that requires basic 
        management features like VLAN segmentation, QoS prioritization, and 
        secure 802.1x login and authentication, showcased in a low cost, 
        easy to configure, and GUI managed 'smart' business solution.
       The DES-1252 comes with 48 10/100BASE-TX Fast Ethernet ports, 
        2 combo 1000BASE-T/SFP ports for flexible copper/fiber Gigabit 
        connection and 2 additional 1000Base-T copper interfaces for 
        uplinking to storage area network devices, servers, or core 
        switching solutions. The Graphical User Interface allows you to 
        implement Quality of Service (QoS), VLANs and security without 
        having to go through complex command line management usually found 
        in other managed switches.
* D-Link Safeguard Engine
   The DES-1252 incorporates advanced mechanisms to detect an attack 
   against the central processing unit of the switch and to take corrective 
   action on the attacking interface. When a Denial of Service attack is 
   waged against the DES-1252, the D-Link Safeguard Engine detects the 
   threat and prevents overload of the central processor thus insuring 
   network integrity and helping to maintain open network bandwidth 
   channels.
* 802.1D Spanning Tree
   Spanning Tree provides protection from unintentional cabling loops 
   forming within a network infrastructure. Loops are dangerous in that 
   they create an unending circle where broadcast and multicast traffic 
   propagate across the network in an endless loop. This creates a storm of 
   traffic that overwhelms the network and brings traffic to a crawl. 
   802.1D Spanning tree detects and breaks these loops ensuring network 
   uptime.
* Port Trunking
   The DES-1252 supports static port trunking of up to 6 groups of 8 ports 
   per device. Ports can be combined together to create multi-link 
   loadsharing aggregated trunks to a server or a network backbone. To 
   expand the network, you can also make use of link aggregation to 
   eliminate bottlenecks between the cascaded switches.
* 802.1Q VLANs
   The DES-1252 provides support for 802.1Q VLANs for improved security and 
   bandwidth utilization. VLANs work by segmenting broadcast domains thus 
   reducing network congestion due to constant network broadcasting. In 
   addition VLANs provide a means of securing each broadcast domain from 
   all others. This in turn prevents users on one VLAN from gaining access 
   to resources on other network segments. VLANs can be configured to 
   segment departmental resources. For example, VLANs can be implemented on 
   an SMB network to prevent the Marketing department from gaining access 
   to secure resources in the Accounting department.
* SNMP Management
   The DES-1252 supports SNMP v1. SNMP is a useful tool in managing and 
   controlling SNMP supported network devices. SNMP enables the DES-1252 to 
   be polled to provide valuable information about the status of the unit 
   and send traps on abnormal events. This sharing of vital management 
   information saves time and money.
* 802.1p Priority Tagging
   Like 802.1Q VLAN tagging, 802.1p places a tag in a frame to indicate the 
   priority of the frame. A tag will represent a priority of 0-7 and an 
   802.1Q compliant switch can read this tag and prioritize traffic 
   accordingly. This differs from port based QoS in that in Port Based QoS 
   all traffic entering a specific port is prioritized the same way with 
   the same value. In 802.1p a port can receive frames with varying 
   priority tags and classify them based on these tags. A VoIP phone that 
   supports 802.1p can assign a priority to its VoIP traffic and when it 
   enters the switch the switch can give it a higher priority so that voice 
   traffic is always clear and jitter free.
* IGMP Snooping
   IGMP Snooping allows for the forwarding of multicast packets such as 
   streaming audio and video, without increasing network broadcast 
   congestion. By snooping IGMP registration information within a frame, a 
   list of workstations who have joined the multicast group is created. 
   This list then allows the switch to intelligently forward packets to 
   only the appropriate member workstations.
* 802.1x Authentication
   802.1x Authentication provides a secure means to allow users to log onto 
   your network. When used in conjunction with a RADIUS server, 802.1x 
   requires each user workstation attached to the DES-1252 to provide a 
   username and password before gaining access to the local area network.
* Operational Simplicity
   The DES-1252 supports a wide array of plug-and-play features:
     - 10/100Mbps auto-negotiation
     - Universal UTP cable recognition for auto straight-through or 
       crossover cable detection (Auto-MDI/MDI-X).
     - Full/Half duplex support
     - IEEE standards support
   Managing the DES-1252 has never been easier. Using its built in browser-
   based management interface, configuring the switch takes only minutes. 
   With full color graphic pictures, diagrams and easy to understand 
   navigation menus, configuring the DES-1252 with the features you require 
   is as easy as surfing the net. The DES-1252 supports many of today's 
   most sought after features like 802.1p priority queuing, 802.1Q VLANs, 
   port trunking, 802.1x authentication, port mirroring, SNMP, spanning 
   tree, link aggregation, IGMP Snooping, broadcast storm control, and 
   more.
     
  -- SPECIFICATIONs -------------------------------------
CONNECTORS   - (48) 10BaseT/100BaseTX/RJ45 ports
               ( 2) 1000BaseT/RJ45 ports
               ( 2) Combo 1000Base-T/SFP ports
FORWARD RATES- 10M :    14,880 pps 
               100M:   148,809 pps 
               1G  : 1,488,095 pps 
FORWARD MODE - Store and Forward 
SWITCHING CAPACITY-
               17.6 Gbps 
FLASH MEMORY - 2MB 
MAC ADDRESS  - 8K MAC Address Table 
IGMP SNOOPING- Supports 64 multicast groups 
802.1D SPANNING TREE-
               Supports per device STP & BPDU forwarding. 
STATIC PORT TRUNK-
               Supports max 6 groups per device and 8 ports per group 
FLOW CONTROL - 802.3x supported flow control 
PORT MIRRORING- 
               Supports one-to-one or many-to-one port mirroring 
               Supports TX, RX and Both mode 
802.1Q VLAN GROUP-
               Supports 256 static VLAN groups 
               Able to configure VID from 1-4094 
802.1p       - Supports 4 Queues 
802.1x PORT-BASED ACCESS CONTROL-
               Default 802.1x forwarding 
BROADCAST STORM CONTROL-
               Allow specifying the per device threshold in terms of 8K - 
                 4096K Bytes per second.
STATIC MAC ADDRESS-
               Supports 256 Static MAC entries 
SAFEGUARD ENGINE-
               Protect CPU from Broadcast/Multicast/Unicast flooding 
WEB-BASED GUI- Compatible with IE, Netscape, Mozilla, Firefox, Opera, 
                 Safari browsers: Configuration Backup/Restore 
                                  Firmware Backup/Restore 
                                  Reboot 
SNMP v1      - Configurable Community setting 
               Supports SNMP Trap 
DHCP CLIENT  - Supports ability to fuction as a DHCP client 
SWITCH DISCOVERY/MANAGEMENT UTILITY-
               Up to 256 agents/switches 
PORT SETTING - Can set Speed, Duplex mode, flow control 
FIRMWARE UPGRADE-
               Via SmartConsole Utility 
NETWORK MANAGEMENT-
               In & Out of Band: HTTP, SNMP v1, Port Mirroring 
ACCESSORIES  - DEM310GT  1000Base-LX SFP/Mini Gigabit Interface converter 
                           (up to 10km) 
               DEM311GT  1000Base-SX SFP/Mini Gigabit Interface converter 
                           (up to 550m) 
               DEM210    100BASE-FX 155 Mbps Single-Mode 15km SFP 
                            Transceiver 
               DEM211    100BASE-FX 155 Mbps Multi-Mode 2km SFP Transceiver
APPROVALS    - FCC class A, CE Class A,VCCI Class A; CUL, UL
POWER SOURCE - 100-240 VAC, 50/60Hz, Internal universal power supply 
               Consumption: 26.2 watts
DIMENSIONS   - 17.3"w x 1.73"d x 12.2"d (19" 1U rack-mount size)
    www.dlink.com