3Com 3CR17571-91 Getting Started Guide - Page 17
BASE-T/ 100BASE-TX Ports, Gigabit Ports, Console Port
UPC - 662705496252
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Switch 4500 - Front View Detail 17 10BASE-T/ 100BASE-TX Ports The Switch 4500 has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports configured as Auto MDIX (cross-over). These ports automatically provide the appropriate connection. Alternatively, you can manually set these ports to 10BASE-T half-duplex, 10BASE-T full0-duplex, 100BASE-TX half-duplex or 100BASE-TX full-duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable. Gigabit Ports The Switch 4500 26 Port has two 1000BASE-X SFP ports and two 10/100/1000BASE-T ports, which are implemented as dual personality combination ports pairing one 1000BASE-X and one 10/100/1000BASE-T port. Only one port in each pair can be enabled at any one time. The Switch 4500 50 Port, 50 Port PWR, and 26 Port PWR models each have four 1000BASE-X Small Form Factor Pluggable (SFP) ports. These also are implemented as two pairs of dual personality combination ports. The port pairings of the 26-Port PWR model are: Port 25 with Port 27; Port 26 with Port 28. The port pairings of the 50-Port models are: Port 49 with Port 51; Port 50 with Port 52. Only one port in each pair can be enabled at any one time. Two 1000BASE-T SFP modules are inlcuded with these switches and can be used for uplinks or stacking using copper Ethernet cabling. While usable in any of the SFP ports, 3Com recommends these SFP modules be installed in the two right-most ports of the switches (27/28 or 51/52). SFP (Small Form Factor Pluggable, or mini-GBIC) 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. 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 which auto-negotiation is mandatory) and the flow control setting can be manually configured. 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.