Cisco 3825 Hardware Installation Guide - Page 233

Chapter 18 Connecting Cisco EtherSwitch Service Modules Cisco EtherSwitch Services Modules Table 18-2 Port Speed and Duplex Port Function Speed Duplex Explanation The operating speed of the switch port. You can choose Auto (autonegotiation) if the connected device can negotiate the link speed with the switch port. The default settings are: • Auto for the external 10/100-Mbps Fast Ethernet ports • Auto for the external Gigabit Ethernet RJ-45 (10/100/1000-Mbps) ports • 1000 Mbps for the SFP module ports The duplex mode of the switch port. Choose from one of the following: • Auto (autonegotiation) if the connected device can negotiate with the switch • Full (full duplex) if both devices can send data at the same time • Half (half duplex) if one or both devices cannot send data at the same time The default settings are: • Auto for the external 10/100-Mbps Fast Ethernet ports • Auto for the external Gigabit Ethernet RJ-45 (10/100/1000-Mbps) ports • Full for the 1000-Mbps ports (SFP) Note You cannot set the port to half duplex if the port speed is set to Auto. SFP Modules The Cisco EtherSwitch service module supports Gigabit Ethernet SFP modules for fiber-optic connections. These laser optical transceiver modules are field-replaceable, and you can insert them into an SFP module slot. You use fiber-optic cables with LC connectors to connect to an SFP module. You can use the SFP modules for gigabit uplink connections to other devices. The SFP modules support 850- to 1550-nm nominal wavelengths. The Cisco StackWise EtherSwitch service module and the 48-port Cisco EtherSwitch service module have one or two SFP module slots into which you can install these SFP module types: • 1000BASE-CWDM • 1000BASE-LH • 1000BASE-LX • 1000BASE-SX • 1000BASE-T • 1000BASE-ZX For more information about SFP modules, see the Cisco Network Modules Hardware Installation Guide at the following URL: http://www.cisco.com/en/US/products/hw/modules/ps2797/products_module_installation_guide_book 09186a00802d2910.html OL-2485-20 Cisco Network Modules Hardware Installation Guide 18-7