The Catalyst 2900 series XL modules add port density and high-performance connectivity to a Catalyst 2900 series network. When installed in the appropriate Catalyst 2900 series switch, these modules support a full range of cabling types, port connectors, and 10, 100, and 1000 megabit-per-second (Mbps) transmission speeds. All the Catalyst 2900 series modules autonegotiate the duplex mode of each port to match that of the attached device. The Ethernet and Fast Ethernet modules also autonegotiate the speed settings of each port.
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