D-Link DGS-1248T manual Vlan Virtual Local Area Network, Features

Switching LAN technology is a marked improvement over the previous generation of network bridges, which were characterized by higher latencies. Routers have also been used to segment local area networks, but the cost of a router, the setup, and maintenance required make routers relatively impractical. Today switches are an ideal solution to most kinds of local area network congestion problems.

VLAN (Virtual Local Area Network)

A VLAN is a group of end-stations that are not constrained by their physical location and can communicate as if a common broadcast domain, a LAN. The primary utility of using VLAN is to reduce latency and need for routers, using faster switching instead. Other VLAN utility includes:

Security: Security is increased with the reduction of opportunity in eavesdropping on a broadcast network because data will be switched to only those confidential users within the VLAN.

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

Features

‹48×10/100/1000Mbps Auto-negotiation Gigabit Ethernet ports

‹4 x 1000Mbps SFP(Mini GBIC) (Auto-Sense) for optional SFP(Mini GBIC) transceiver to extend distance, share with 4 1000BASE-T ports

‹All RJ-45 ports support auto MDI/MDIX, so there is no need to use cross-over cables or an up-link port

‹Half-duplex transfer mode for connection speed 10Mbps and 100Mbps

‹Full-duplex transfer mode for connection speed of 10Mbps, 100Mbps, and 1000Mbsps

‹Wire speed reception and transmission

‹Store-and-Forward switching scheme capability to support rate adaptation and ensure data integrity

‹Up to 16K unicast addresses entities per device, self-learning, and table aging

‹1632KBytes packet buffer

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