User manual D-LINK DGS-105

[. . . ] 0 D-Link DGS-105/108 Gigabit Ethernet Switch ____________________ Information in this document is subject to change without notice. Reproduction in any manner whatsoever without the written permission of D-Link Corporation is strictly forbidden. Trademarks used in this text: D-Link and the D-LINK logo are trademarks of D-Link Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. [. . . ] 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. These priority queues are labeled as 3, the high queue to 0, the lowest queue. 1p are mapped to the Switch's priority tags as follows: • • • • • • • Priority 0 is assigned to the Switch's Q1 queue. Strict priority-based scheduling, any packets residing in the higher priority queues are transmitted first. 2 D-Link DGS-105/108 Gigabit Ethernet Switch Switching Technology Another key development pushing the limits of Ethernet 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 segments 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 different 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 maintenance required make routers relatively impractical. Today’s Switches are an ideal solution to most kinds of local area network congestion problems. switch Description The DGS-105/108 Switch is equipped with five ports providing dedicated 10 , 100 , or 1000 Mbps bandwidth. These ports can be used for connecting PCs, printers, servers, routers, Switches, hubs, and other network devices. [. . . ] 13 D-Link DGS-105/108 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. An Ethernet port connection where the transmitter of one device is connected to the receiver of another device. An Ethernet port connection where the internal transmit and receive lines are crossed. MIBs are used by the Simple Network Management Protocol (SNMP) to contain attributes of their managed systems. [. . . ]