Sorry, I don't know this.
>If the integral CSU/DSU were to be used (I assume it *has* to be
>used?)
Yes, they MUST be used and cannot be bypassed.
>then the Telco's responsibility should be to deliver the
>4-wire feed into the CSU/DSU directly -- is this concept correct?
Yes.
>If the range of the internal CSU/DSU were to be less than required,
>is there an alternative, external way of handling E1 connectivity?
No.
>How many CSU/DSU's are there in the PM3 chassis? If 2xE1 are there
>2xCSU/DSU ?
One CSU/DSU per E1 interface.
-MZ
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