I have two routers cisco 1720 with 56/64 DSU/CSU WIC and t1 dsu/csu wic and a cisco 1602 with t1 dsu/csu wic . I wanted to connect them back to back for testing purposes. Itried using a crossover cable and I couldn't get a link for both of them is there something that I'm missing or doing wrong in here? I tried to search for this and the only thing that keeps on popping up was to use a Serial Cable which both routers don't have serial inputs. Thank you in advance for advices and answers.
I have this problem too.