User manual SMC 9712GT/2

[. . . ] This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. Operation is subject to the following two conditions: This device may not cause harmful interference. This device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. CE MARK DECLARATION OF CONFORMANCE FOR EMI AND SAFETY (EEC) This is a class A product. [. . . ] Each port on the switch supports auto MDI/MDI-X, which eliminates the need for crossover cables or uplink ports. The switch is plug-and-play; any port can be connected to a server, a hub, or a switch, using straight-through or crossover cable. FEATURES Complies with IEEE 802. 3, IEEE 802. 3u, IEEE 802. 3ab standards 24 ports for 10/100BASE-TX full- and half-duplex connections. 2 ports for 10/100 Mbps full/half-duplex and 1000 Mbps full-duplex connections. Supports IEEE 802. 3x flow control for full-duplex mode and back pressure for half-duplex mode. ­ 11 ­ Overview CHAPTER 1 | Introduction IEEE 802. 1P QOS The SMC9712GT/2 switch supports 802. 1p priority queuing Quality of Service, which is an implementation of the IEEE 802. 1p standard. With the 802. 1p QoS function, you can reserve bandwidth for important functions that require a lot of bandwidth or have a high priority, such as VoIP (Voice-over Internet Protocol), web browsing applications, or video conferencing. The switch has separate hardware queues on each physical port to which packets from various applications are mapped and priorities assigned. The illustration below shows how 802. 1p priority queuing is implemented on the switch. Figure 1: Mapping QoS on the Switch Tag untag 0 1 2 3 4 5 6 7 Priority Queue Weight Value TC0 1 TC1 2 There are two priority queues labeled TC0 and TC1. The untagged packets and the eight IEEE 802. 1p priority values (defined by the standard) are mapped to the two priority queues on the switch. TC1 has the highest priority of the two priority queues, while TC0 has the lowest priority. The SMC9712GT/2 switch uses Weighted Robin Round (WRR) for scheduling. Set the switch on a flat surface strong enough to support the entire weight of the switch with all fittings. 2. Turn the switch over and attach the supplied rubber feet to the recessed areas on the bottom at each corner of the switch. Figure 4: Attaching Rubber Feet ­ 17 ­ CHAPTER 3 | Installing the Switch Installation 4. Upturn the switch and set in the desired location, making sure there is enough ventilation space on all sides for proper air flow 5. CAUTION: Avoid placing anything heavy on the switch. RACK INSTALLATION To install the switch in an EIA standard-sized, 19-inch rack, follow the instructions described below: 1. Secure the supplied rack-mounting brackets to each side of the switch with supplied screws, as illustrated in the following figure. Figure 5: Attaching Brackets ­ 18 ­ CHAPTER 3 | Installing the Switch Installation 2. Use suitable screws (not provided) to secure the brackets to the rack, as illustrated in the following figure. Figure 6: Mounting the Switch 3. See "Powering On" on page 19. POWERING ON The SMC9712GT/2 switch is powered by connecting to an AC power supply using a power cord. When powering on the switch, it automatically initializes and the LED indicators respond as follows: 1. All of the LED indicators flash momentarily for one second, which represents a resetting of the system. 2. The Power LED indicator turns on green. ­ 19 ­ CHAPTER 3 | Installing the Switch Connecting Network Devices CONNECTING NETWORK DEVICES The switch is designed to be connected to network cards in PCs and servers, as well as to other switches and hubs. CABLING GUIDELINES The RJ-45 ports on the switch support automatic MDI/MDI-X pinout configuration, so you can use standard straight-through twisted-pair cables to connect to any other network device (PCs, servers, switches, routers, or hubs). [. . . ] Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors at both ends. Use Category 5, 5e or 6 cable for 1000BASE-T connections, Category 5 or better for 100BASE-TX connections, and Category 3 or better for 10BASE-T connections. CONNECTING TO PCS, SERVERS, HUBS AND SWITCHES 1. Attach one end of a twisted-pair cable segment to the device's RJ-45 connector. 2. Attach the other end of the cable segment to an available port on the switch. [. . . ]