By Brad Reese , Network World |
The Cisco GBIC is a hot-swappable input/output device that plugs into a Gigabit Ethernet port or slot, linking the port with the network. Cisco GBICs can be interchanged on a wide variety of Cisco products and can be intermixed in combinations of 1000BASE-T, 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-ZX, or 1000BASE-CWDM interfaces on a port-by-port basis. You cannot configure speed or duplex mode on GBIC ports. But for certain types of GBICs (for example, 1000BASE-SX, -LX, or -ZX GBICs), you can configure the speed to not negotiate (nonegotiate) if they are connected to a device that does not support auto-negotiation. The GBIC-module ports support only 1000 Mbps. The speed values of 10 Mbps and 100 Mbps are not supported. You cannot hardcode 100 MB on a 1000Base GBIC and it will always be 1000 MB full duplex whereas the 100BASE-FX will be 100 MB full duplex. For more information refer to: Cisco Gigabit Interface Converter (GBIC) DWDM SFP
The Cisco SFP Gigabit Interface Converter is a hot-swappable input/output device that plugs into a Gigabit Ethernet port or slot. SFPs can be used and interchanged on a wide variety of Cisco products and can be intermixed in combinations of 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-ZX, or 1000BASE-BX10-D/U on a port-by-port basis. On the other hand, SFP modules are available in the two speeds of 100 Mbps and 1000 Mbps. You can connect a 100BASE-FX SFP FastEthernet interface converter on Gigabit SFP ports in Catalyst 3750, 3560 and 2970 Series Switches. For more information refer to: Cisco SFP Optics For Gigabit Ethernet Applications and Cisco 100BASE-X SFP Module for Fast Ethernet SFP Ports
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Brad Reese is research manager at BradReese.Com, advancing the careers of 600,000-plus certified individuals in the growing Cisco Career Certification Program.
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