Answer Posted / ran145

ISDN PRI has two standards i.e. T1 which is US standard and
has 23B and 1 D channel and speed is 1.54 Mbps.
E1 which is European standard and has 30B and 1D channel and
speed is 2.048Mbps.

Now ISDN PRI transmits info in the digital form and
channelized E1 transmits info in analog form.

ISDN PRI has inbuilt D channels but in channelized E1 there
are no inbuilt D Channels and hence signaling has to be done
by data channels only which degrades the performance.

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