3Com 3812 - SuperStack 3 Switch Getting Started Manual

Also see for 3C17400: Getting started guide Implementation guide Implementation guide Datasheet

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3Com 3812 - SuperStack 3 Switch Getting Started Manual Manual pdf 14 page image

14 CHAPTER 1: INTRODUCING THE SUPER STACK 3 SWITCH 3812, S WITCH 3824, AND SWITCH 3848Figure 3 Switch 3848 — front viewWARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. Theycannot be used as standard traditional telephone sockets, or to connectthe unit to a traditional PBX or public telephone network. Only connectRJ-45 data connectors, network telephony systems, or networktelephones to these sockets.Either shielded or unshielded data cables with shielded or unshieldedjacks can be connected to these data sockets.10BASE-T/100BASE-TX/1000BASE-T PortsThe 10BASE-T/100BASE-TX/1000BASE-T ports have RJ-45 connectors andare configured as Auto MDIX (cross-over).The default state for these ports is auto-negotiation enabled, where thespeed, duplex and flow control modes of a link are automaticallydetected to provide the highest available bandwidth with the link partner.Alternatively, auto-negotiation can be disabled. These ports can bemanually configured to 10 Mbps half duplex, 100 Mbps half duplex,10 Mbps full duplex or 100 Mbps full duplex. It is not possible tomanually configure a 1000 Mbps link as auto-negotiation is mandatory inthe 1000 Mbps standard. If auto-negotiation is disabled, Auto MDIXcannot function and the ports are fixed as MDIX (cross-over) mode.If auto-negotiation is disabled on a 1000 Mbps port, the speed will dropto the highest available speed. By default this is 100 Mbps.Dual Personality SFPPortsThe four Dual Personality SFP (Small Form Factor Pluggable) ports supportfiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul(LH70) transceivers in any combination. This offers you the flexibility ofdua1740-0aaa03.book Page 14 Thursday, December 23, 2004 9:23 PM