Answer / jitendera kumar sinha

very basic questions is that
the u interface is 2 wire isdn convations and plug directly
to the isdn connection
wher as s/t interface have 4 wire isdn conection and to use
it we used a device some time called TA to convret 4 wire
to 2 wire isdn connetions
so siimple

Answer / anand gupta

u use 2wire and s/t has 4 wire.

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