3Com 3CR17251-91 Getting Started Guide - Page 19
BASE-X SFP Ports, 100BASE-X SFP Ports (Switch 5500-EI FX only), Console Port
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Switch 5500 Family - Front View Detail 19 The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes of a link are automatically detected to provide the highest available bandwidth with the link partner. Alternatively, auto-negotiation can be disabled. These ports can be manually configured 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 as auto-negotiation is mandatory in the 1000 Mbps standard. If auto-negotiation is disabled, Auto MDIX cannot function and the ports are fixed as MDIX (cross-over) mode. If auto-negotiation is disabled on a 1000 Mbps port, the speed will drop to the highest available speed. By default this is 100 Mbps. 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. 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. Duplex and flow control must be manually configured. 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 will need to connect an RJ-45 to DB9 converter cable to a standard null modem cable in order to connect a terminal. The default baud rate is 19,200.