3Com 2226 PWR User Guide - Page 9

Physical Features 9 The 802.1D standard specifies eight distinct levels of priority (0 to 7), each of which relates to a particular type of traffic. The priority levels and their traffic types are shown in Table 3. Table 3 Priority Levels for Traffic Types Priority Level Traffic Type 0 Best effort 1 Background 2 Standard (spare) 3 Excellent effort (business critical) 4 Controlled load (streaming multimedia) 5 Video (interactive media), less than 100 milliseconds latency and jitter 6 Voice (interactive voice), less than 10 milliseconds latency and jitter 7 Network control reserved traffic The traffic prioritization feature supported by the Switch is compatible with the relevant sections of the IEEE 802.1D standard (incorporating IEEE 802.1p). Physical Features Figure 1 shows the front and rear panels of the Switch. The numbers in this diagram refer to numbered sections in "Front Panel" on page 9 and "Rear Panel" on page 12. Figure 1 Front and Rear Panels 1 2 3 4 9 5 10 67 8 Front Panel The front panel of the Switch contains a series of indicator lights (LEDs) that help describe the state of various networking and connection operations. (1) PoE LEDs These LEDs show whether individual ports are provid- ing power. Status Green Off Meaning Power is being delivered No power is being delivered (2) 24 RJ-45 Ports WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets.