Can somebody please clarify to me the difference between the following modules:
1-WIC-2T: 2-Port Serial WAN Interface Card
2- WIC-2A/S: 2-Port Async/Sync Serial WAN Interface Card
Also, if I need 16-port serial module, do I need to order: HWIC-16A?
One last question: what does this module do: NM-32A?