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NT1 and PRI

Unanswered Question
Jan 10th, 2012
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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

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Overall Rating: 3 (2 ratings)
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rais Wed, 01/11/2012 - 06:41
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PRI is delievered as 4-wire T1 line.

Thanks.

paolo bevilacqua Wed, 01/11/2012 - 15:40
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Not always.


first of all, OP has E1 not T1.

Second, E1 is some countries, E1 is delivered over unbalanced coax cables.

ohassairi Wed, 01/11/2012 - 21:35
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so can we say that in all cases PRI does not need NT1 ?

ajay chauhan Wed, 01/11/2012 - 22:35
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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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