In order to run unframed E1 we need to use either one of these two cards:
AS53-4CE1+ , AS53-8CE1+
However, according to the feature navigator these cards are supported
only on the AS5300.
Are there any alternatives for the AS5350XM or the AS5400 ?
Correct, the 5350 and 5400 are pure Universal Access Servers to be used together with an external router to terminate serial or other type of WAN links.