i have 2 routers 2821 with wic-2t serical card and 1921 with hwic-2t serial card
My question is - can i connect between those two serials card with serial cross cable ?
You can connect the two together but you will need to make sure one supplies clocking, and I am not sure on the media type but if you use RJ-45 make sure the pairs are flipped at the distant end.
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This is known as a T1 crossover
Yes, you can connect back to back using
Smart Serial DTE Interface To Smart Serial DCE Interface Crossover Cable.
Normally this is done for studying purpose.
I did purchase some of them last year from http://www.anthonypanda.com/?sp=&p=6&cat2=0&cat1=0&cat0=2&id=22&cat1=0&cat0=2&new=&more=&s=46b15dcbbdd425421eb3389650329c54〈=en