The Catalyst 3548 XL switch is a member of the Cisco Systems Catalyst 3500 series XL, a scalable line of stackable 10/100 and Gigabit Ethernet switches that delivers premium performance, manageability, and flexibility with unparalleled investment protection. The 3548 XL offers customers tremendous benefits through Gigabit Ethernet-based configuration options, the new Cisco Switch Clustering multidevice management architecture, and integrated IP voice and telephony support.The Catalyst 3548 XL has 48 10/100 ports and two GBIC-based Gigabit Ethernet ports. The built-in Gigabit Ethernet ports accommodate a range of GBIC transceivers, including the Cisco GigaStack GBIC, and 1000BaseSX, 1000BaseLX/LH and 1000BaseZX GBICs. The dual GBIC-based Gigabit Ethernet implementation provides customers tremendous deployment flexibility allowing customers to implement one type of stacking and uplink configuration today, while preserving the option to migrate that configuration in the future.