could some expert give an answer to the original post: is it reasonable to assume that a EWSD exchange passing 200 million minutes a month (without being overloaded) may experience problems from a traffic of a customer connected via 4 E1 PRI (and making not more than 900k minutes a month)?
more information on the operator:
a) the network of the operator consists of 4 such exchanges, total traffic is about 800 mmm
b) it has about 4500 E1s only for POI interconnections (to other operators)
c) operator advertises that its network has a lot of reserves and is very redundant.
concerning the traffic pattern, the majority of the traffic is directed to the customers of the operator!