24 10/100Mbps Ports for Workstation Connection The switch provides 24 10/100Mbps ports supporting auto-sensing and auto-negotiation of network speeds and full/half duplex. These ports can connect to workstations and print servers, giving each a dedicated bandwidth. All ports support plug-and-play auto MDI/MDIX, allowing you to connect to any node device without the need to change your usual straight-through twisted-pair cables.

Switch Stacking & GBIC Port
The switch provides an open slot for installation of a stack module, which is equipped with a stacking port and a GBIC port. The stacking port is for switch stacking. The GBIC port provides for flexible deployment of multi-mode or extended cable-length single-mode fiber. At 2000Mbps full duplex, this port provides for Gigabit server or fiber backbone attachment.

Scalable Expansion
Up to 13 DES-3226S can be stacked together in a ring architecture. You can add units to reach maximum 312 10/100Mbps ports and 13 GBIC ports per stack. The switches are stacked together through high-speed stack cables, allowing the entire stack to perform as a single entity.

Fault Tolerant Star Stacking
Alternately, you can stack a DGS-3212SR(L2 switch) or DGS-3312SR (L3 switch) Stacking Master with 12 DES-3226S, to get 288 10/100BASE-TX ports, plus 12 Gigabit ports for server and backbone attachment. This star stacking scheme allows packets to be switched directly through the Stacking Master. Fault tolerance is provided, as any single broken link between a switch and the Stacking Master will not affect the rest of the links of the stack.

Flow Control to Prevent Packet Loss
The switch supports standard IEEE 802.3x Flow Control. Working in conjunction with buf fer overrun auto-detection, this full-duplex data transfer mode provides protection against possible data loss for 802.3x supported servers directly connected to the switch.

Port Trunks for Aggregated Bandwidths
With low cost per port, port trunking provides an easy and economical alternative solution for server connection to attain Gigabit bandwidth. Up to 8 10/100Mbps ports or 8 Gigabit ports can be combined together to create a multi-link load-sharing aggregated bandwidth to a server. Trunked ports can span multiple units of the stack for fail-safe connectivity to mission-critical servers and the network center.

VLANs for Enhanced Security & Performance
VLANs improve security and bandwidth utilization by limiting the broadcast domains and confining intra-group traffic within their segments. To segment up the network, workstations supporting VLAN can be grouped into different Virtual  LANs (VLANs). The switch also supports asymmetric VLAN and GVRP (GARP VLAN Registration Protocol) for automatic VLAN configuration distribution.

Advanced Network Access Management
Port-based and MAC-based 802.1x features enable user authentication for each network access attempt. Port Security features allow you to limit the number of MAC addresses per port in order to control the number of stations for each port. Static MAC addresses can be defined for each port to ensure only registered machines are allowed to access. By enabling both of these features, you can establish an access mechanism based on user and machine identities, as well as control the number of access stations.

Multi-layer Access Control List (ACL)
Access Control Lists (ACL) allow the network administrator to define policies on network traffic control. The switch supports comprehensive and multi-layer ACLs, providing a powerful tool for network management. For example, the switch can be set to block malicious bulk traffic from specific clients (based either on MAC or IP addresses). Or during a virus attack, the switch can be set to restrict its flooding based on a virus's unique pattern (TCP/UDP port number).

Advanced QoS Support
The switch supports not only Layer 2 802.1p Priority Queue control, but also a variety of ways to prioritize network packets. Multi-layer information from L2 to L4 can be used to classify packet priorities. This function support allows you to attach IP telephony devices or video servers to the switch to run delay-sensitive applications like video conference.

Flexible Transmission Scheduling
The switch supports 2 methods of packet transmission scheduling: Strict Scheduling and Round-Robin. You can select to use Strict Scheduling  to strictly enforce your priority queues, or Round-Robin to address bandwidth limitations at peak time. Round-Robin allows each queue to be assigned a different percentage of the output port's bandwidth, so that lower-priority queues are not denied access to buffer space and port bandwidth.

IGMP Snooping for Broadcast Control
The switch listens to IGMP (Internet Group Management Protocol) messages to build mapping table and associate forwarding filters. It dynamically configures the switch ports to forward IP multicast traffic only to those ports associated with multicast hosts.

Broadcast Storm Control
To limit too many broadcast/multicast flooding in the network, broadcast/multicast storm control is configured to screen excessive traffic. Threshold values are available to control the rate limit for each port. Packets are discarded if the respective count exceeds the configured upper threshold in a given time interval. The possible range of upper threshold is from 0 to 255k packets per second.

Port Mirroring
This function allows you to mirror adjacent ports for the purpose of analyzing incoming and outgoing packets where packet patterns can be studied. 802.1D Compatible & 802.1w Rapid Spanning Tree For mission critical environments with multiple switches supporting STP, you can configure the stack of switches with a redundant backup bridge path, so transmission and reception of packets can be guaranteed in event of any fail-over switch on the network.

Multiple Management Interfaces
SNMP v.1, v.2c, v .3 network management is supported, using the built-in MIBs. RMON monitoring and SYSLOG are provided for effective central management. The switch also provides a Command Line Interface (CLI) and a Web-based GUI. CLI enables quick system configuration for administrators familiar with command line operation. The embedded Web-based interface allows you to easily access the switch from anywhere on the network and trouble shoot it in real-time. You can, for example, browse the MAC address table via the Web browser and perform searching to identify the location of any workstation. Port utilization graphs provide real-time traffic monitoring and diagnostic information.

Optional Ports (Stand-alone Configuration)
If you configure the DES-3226S as a stand-alone switch, you can install the following modules in the open slot:
- 2-port Fast Ethernet module (10/100BASE-TX)
- 1 or 2-port Fast Ethernet multi-mode fiber module (100BASE-FX)
- 1 or 2-port Fast Ethernet single-mode Fiber module (100BASE-FX)
- 2-port Gigabit fiber module (1000BASE-SX)
- 2-port Gigabit fiber module (1000BASE-LX)
- 2-port Gigabit copper module (1000BASE-T)
- 2-port GBIC module