01-10-2012 10:59 PM - edited 03-04-2019 02:52 PM
hello
in ISDN word we use NT1 device, as i know, to convert between 2 wires (coming from telco) and 4 wires (going to s/T interface)
however i usually read that NT1 is used with BRI only. not with PRI.
can anyone confirm that we don't need NT1 with PRI ? and why ? is PRI cable coming from telco 4 wires ?
thanks
01-11-2012 06:41 AM
PRI is delievered as 4-wire T1 line.
Thanks.
01-11-2012 03:40 PM
Not always.
first of all, OP has E1 not T1.
Second, E1 is some countries, E1 is delivered over unbalanced coax cables.
01-11-2012 09:35 PM
so can we say that in all cases PRI does not need NT1 ?
01-11-2012 10:35 PM
I agree with Paolo.
Same time for E1/T1 balanced or unbalanced circuits NT1 is not at all required.
Thanks
Ajay
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