Cisco Catalyst WS-C3560X-48T-E is 48 Gigabit Ethernet ports standalone switch with four optional 1G/10G network uplink module and no option to stack in IP service feature set. IP service feature set provides up to 1005-Vlans and advanced layer 3 routing features, advanced security features and management features. WS-C3560X-48T-E is designed for enterprise distribution layer switching in full layer 3 capability includes BGP, EIGRP, OSFP, IPv4/v6, multicast routing, IPSLA, Netflow, advanced Qos, VRF-lite. WS-C3560X-48T-S switch comes with one default power supply module, customers can purchase additional power supply module insert into power supply bay 2 in order to power redundancy.

WS-C3560X-48T-E

Cisco Catalyst 3560-X Series Switch

48 * 10/100/1000 Gigabit Ethernet ports with optional uplink network modules

Dual redundant, modular power supplies and fans

IP service feature set with full Layer 3 routing features, VRF-lite, IPSLA, advanced QoS, PIM, Netflow, PBR

64MB flash and 256 memory (DRAM)

USB Type-A and Type-B ports for storage and console respectively and an out-of-band Ethernet management port

                                                                                                     Figure 1

Cisco Catalyst 3560-X Series Switches support 4 optional network modules for uplink ports (Figure 1);
The default switch configuration doesn't include the uplink module; 
When purchasing switch, customers have flexibility to choose any group of network modules described below:

                                                                                              Figure 2

Dual Redundant Modular Power Supplies

Cisco Catalyst 3750-X Series and 3560-X Series Switches support dual redundant power supplies (Figure 2);
One power supply is shipped with the switch by default;
Other power supply/suppliers can be purchased when ordering the switch or next time according to your needs.
If only one power supply is installed, it should always be in the power supply bay 1.

Table below shows the different power supplies available in these switches and available PoE power.

Power Supply Models