3Com 5500-EI Getting Started Guide - Page 17
BASE-X SFP Ports, 100BASE-X SFP Ports (Switch 5500-EI FX only), Console Port
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Switch 5500 Family - Front View 17 You can disable auto-negotiation. You can manually configure these ports to 10 Mbps half duplex, 100 Mbps half duplex, 10 Mbps full duplex, or 100 Mbps full duplex. It is not possible to manually configure a 1000 Mbps link because auto-negotiation is mandatory in the 1000 Mbps standard. If you disable auto-negotiation, Auto MDIX cannot function and the ports become fixed in MDIX (cross-over) mode. If you disable auto-negotiation on a 1000 Mbps port, the speed drops to the highest available speed, which is 100 Mbps by default. 1000BASE-X SFP Ports The 1000BASE-X SFP (Small Form Factor Pluggable) ports support fiber Gigabit Ethernet short-wave (SX), long-wave (LX), long-haul (LH70), and copper (T) SFP Transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups, or to create a high capacity aggregated link backbone connection. The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes are negotiated. As the speed and duplex modes are fixed by the media type, only the flow control is negotiated with the link partner. Alternatively, auto-negotiation can be disabled (except 1000BASE-T where auto-negotiation is mandatory) and the flow control setting can be manually configured. You can also use these ports for stacking the 5500 SI and EI. For information about stacking these switches, see the section entitled "Guidelines For Interconnecting Units" on page 78. 100BASE-X SFP Ports The Switch 5500-EI FX has 24 100BASE-X SFP ports. These are 100Mbps (Switch 5500-EI FX ports that can use multi-mode fiber optic cables of up to 2km and only) single-mode fiber optic cables of up to 10km. You must manually configure duplex and flow control. The Switch 5500-EI FX supports copper transceivers on the Gigabit SFP ports only. Console Port The console port allows you to connect a terminal and perform remote or local out-of-band management. As the console port on the Switch is an RJ-45 port, you must connect an RJ-450 to DB9 converter cable to a standard null modem cable in order to connect a terminal.