why carrier provides external csu/dsu !!

From: Jeongwoo Park (Jpark@xxxxxxxx)
Date: Fri Dec 14 2001 - 20:27:25 GMT-3

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Hi all
Do anyone know why carrier supplies external csu/dsu. Actually this is
happening in Mexico.
Here in US, I could have built-in csu/dsu in the router, so that we could
own csu/dsu.
But this carrier that runs 56 K frame-relay from US to Mexico supplies
CSU/DSU.
Do you know why they want to do that?

Thanks in advance

JP

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