Dell PowerConnect 26 User Manual

Contents

Connecting Switches to SystemsBy connecting a switch to systems, you can form a small network. To improve network efficiency, use 1000-Mbps full-duplex operation between the server andswitch if the LAN adapter on the server can operate in full-duplex mode.All the RJ-45 ports support Auto MDI/MDIX and therefore automatically detect the type of cable used to connect the network device. Crossover or straight-through networking cables can be used to connect PCs as well as other networking devices like hubs or routers to the switch. All ports on the switchautomatically negotiate speed and whether to operate in full duplex or half duplex.Class-of-ServiceThe switch supports tag-based prioritization following the IEEE 802.1p standard. The eight levels of IEEE 802.1p priority are mapped to the two priorityqueues of each port. For each port, the two priority queues are scheduled following a Weighted Round Robin scheme.Table 1-1. Tag-Based PrioritizationMounting Kit InstructionsThese switches come with mounting brackets and screws for rackmounting or wallmounting and rubber feet for stationing on a flat surface.Installing the Switch on a Flat SurfaceThe switch can be installed on any appropriate level surface that can safely support the weight of the switches and their attached cables. There must beadequate space around the switch for ventilation and access to cable connectors.To install the switch on a flat surface, complete the following steps:1. Set the switch on the flat surface and check for proper ventilation.Allow at least 5.1 cm (2 inches) on each side for proper ventilation and 12.7 cm (5 inches) at the back for power cable clearance.2. Attach rubber feet on each marked location on the bottom of the chassis.The rubber feet are optional, but are recommended to keep the switch from slipping.Installing the Switch in a RackThe switch can be installed in Dell PowerEdge™ racks, which are 48.3 cm (19 inches). It can also be installed in most other standard 19-inch racks and mosttelco two-post racks.IEEE 802.1p Priority Priority Queue Scheduling Weight0-3 0 14-7 1 2NOTE: The IEEE 802.1p priority information is part of the IEEE 802.1q tag that also defines VLAN memberships. The switches will ignore the VLANmembership information in the tag (that is, all ports are part of all VLANs), but will preserve the full tag information—including packet priority and VLANID—when transmitting the packet at the destination port.