Can somebody tell me what's the difference between these switches? Thanks.
The big difference between them is the former is '-L' while the latter is '-S'. -L means LAN Base while -S means IP Base. More product features below:
WS-C3650-48FS-L Overview:
PoE Switch
48 * 10/100/1000 POE+ Ethernet ports with 4 * 1G SFP uplinks
Layer 2 switching with limited static routing features
LAN Base IOS image with upgrade option to IP service (L-C3650-48-L-E) or IP base (L-C3650-48-L-S)
Up to 9 members stacking and up to 160Gbps of stack throughput
Dual redundant power supplies and fans redundant modular
WS-C3650-48FS-S Overview:
PoE Switch
48 * 10/100/1000 Ethernet POE+ ports with fixed 4 * 1G SFP uplinks
IP base image with update option to IP service (L-C3650-48-S-E)
Layer 3 routing features
Up to 9 members stacking and up to 160Gbps of stack throughput
Up to 40G wireless bandwidth per switch, up to 25 APs and 1000 Wireless clients for each switching entity