I'd like to ask for some help. There is a 2621XM with a NM-4A/S card and connected via leased line on 128kbps. We want to upgrade the line to 512kbps but we'll migrate into HWIC cards later. Will the excisting NM-4A/S card operate(at 128kbps synchronous) over the new line(512kbps)?
Thanks in advance