Cisco Catalyst 3750-X series is an enterprise-class stackable, fixed configuation switch. It is identical that WS-C3750X-48T-S upgrades from IP base feature set to IP service feature set through software license activation. The switches comes with many innovation features, such as Cisco StackWise Plus technology, EnergyWise, MacSec, Cisco TrustSec and StackPower to optimize high availability, scalability, security, energy efficiency, ease of operation and investment protection. WS-C3750X-48T-E integrates with 48 Gigabit Ethernet ports with IP service feature set. Moreover, four types of hot-swapping uplinks network module for 3750X/3560X series bring flexibility for customer to choose uplink connections depending on their needs .The innovation StackWise plus technology supports up to 9 switches stacking to transform 9 physical gear into a single switch and provides up to 64Gbps system bandwidth, StackWise technology also support backward compatibility with StackWise technology, which means that 3750X can stack with old model of 3750-series switch, such as 3750E or 3750 in the same time. The StackPower technology aggregate the power supplies in the power stack and manage the power like single large power pool at feeds the single load the power stack members."